diff --git a/toolchain/check/testdata/alias/no_prelude/alias_of_alias.carbon b/toolchain/check/testdata/alias/no_prelude/alias_of_alias.carbon
index 7dac2c8ea027..0227e04ea8fa 100644
--- a/toolchain/check/testdata/alias/no_prelude/alias_of_alias.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/alias_of_alias.carbon
@@ -52,6 +52,9 @@ let d: c = {};
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/alias/no_prelude/export_name.carbon b/toolchain/check/testdata/alias/no_prelude/export_name.carbon
index c14b254de1de..9f3f634b6001 100644
--- a/toolchain/check/testdata/alias/no_prelude/export_name.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/export_name.carbon
@@ -90,6 +90,9 @@ var d: D* = &c;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export.carbon
@@ -104,6 +107,7 @@ var d: D* = &c;
 // CHECK:STDOUT:   %import_ref.f42 = import_ref Main//base, C, unloaded
 // CHECK:STDOUT:   %import_ref.05a: type = import_ref Main//base, D, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//base, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -117,6 +121,9 @@ var d: D* = &c;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_orig.carbon
@@ -131,6 +138,7 @@ var d: D* = &c;
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.909 = import_ref Main//base, D, unloaded
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//base, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -144,6 +152,9 @@ var d: D* = &c;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- use_export.carbon
@@ -158,6 +169,7 @@ var d: D* = &c;
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.c3f: type = import_ref Main//export, D, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//export, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export, inst21 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -177,6 +189,9 @@ var d: D* = &c;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -234,6 +249,7 @@ var d: D* = &c;
 // CHECK:STDOUT:   %import_ref.c3f: type = import_ref Main//export, D, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export_orig, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//export_orig, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export_orig, inst21 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -265,6 +281,9 @@ var d: D* = &c;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_orig.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/alias/no_prelude/fail_aliased_name_in_diag.carbon b/toolchain/check/testdata/alias/no_prelude/fail_aliased_name_in_diag.carbon
index fbc8732fd957..dbef88eeaeae 100644
--- a/toolchain/check/testdata/alias/no_prelude/fail_aliased_name_in_diag.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/fail_aliased_name_in_diag.carbon
@@ -60,11 +60,17 @@ let c_var: c = d;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/alias/no_prelude/fail_modifiers.carbon b/toolchain/check/testdata/alias/no_prelude/fail_modifiers.carbon
index 2b1b7d5eb95b..1ceb404f048a 100644
--- a/toolchain/check/testdata/alias/no_prelude/fail_modifiers.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/fail_modifiers.carbon
@@ -76,5 +76,8 @@ extern alias C = Class;
 // CHECK:STDOUT: class @Class {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/alias/no_prelude/fail_name_conflict.carbon b/toolchain/check/testdata/alias/no_prelude/fail_name_conflict.carbon
index 4cde4fa881eb..2ca80de93e4d 100644
--- a/toolchain/check/testdata/alias/no_prelude/fail_name_conflict.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/fail_name_conflict.carbon
@@ -69,6 +69,9 @@ alias b = C;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/alias/no_prelude/import.carbon b/toolchain/check/testdata/alias/no_prelude/import.carbon
index 19350989d7f0..6cdc57bca169 100644
--- a/toolchain/check/testdata/alias/no_prelude/import.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/import.carbon
@@ -100,6 +100,9 @@ var c: () = a_alias_alias;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- class2.carbon
@@ -116,6 +119,7 @@ var c: () = a_alias_alias;
 // CHECK:STDOUT:   %import_ref.204: type = import_ref Main//class1, c_alias, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.6da = import_ref Main//class1, a, unloaded
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//class1, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//class1, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -143,6 +147,9 @@ var c: () = a_alias_alias;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "class1.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- class3.carbon
@@ -158,6 +165,7 @@ var c: () = a_alias_alias;
 // CHECK:STDOUT:   %import_ref.3fd: type = import_ref Main//class2, c_alias_alias, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.b9b = import_ref Main//class2, b, unloaded
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//class2, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//class2, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -181,6 +189,9 @@ var c: () = a_alias_alias;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "class2.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- var1.carbon
diff --git a/toolchain/check/testdata/alias/no_prelude/import_access.carbon b/toolchain/check/testdata/alias/no_prelude/import_access.carbon
index 777bc3553018..58ead31538d9 100644
--- a/toolchain/check/testdata/alias/no_prelude/import_access.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/import_access.carbon
@@ -74,6 +74,9 @@ var inst: Test.A = {};
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- def.impl.carbon
@@ -89,6 +92,7 @@ var inst: Test.A = {};
 // CHECK:STDOUT:   %import_ref.f42 = import_ref Test//def, C, unloaded
 // CHECK:STDOUT:   %import_ref.323: type = import_ref Test//def, A, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Test//def, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Test//def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -110,6 +114,9 @@ var inst: Test.A = {};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "def.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/alias/no_prelude/import_order.carbon b/toolchain/check/testdata/alias/no_prelude/import_order.carbon
index 78ee22805865..495d9f4a654f 100644
--- a/toolchain/check/testdata/alias/no_prelude/import_order.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/import_order.carbon
@@ -67,6 +67,10 @@ var a_val: a = {.v = b_val.v};
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.v [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .v = %.loc4_16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- b.carbon
@@ -88,6 +92,7 @@ var a_val: a = {.v = b_val.v};
 // CHECK:STDOUT:   %import_ref.610: type = import_ref Main//a, c, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.14f: type = import_ref Main//a, d, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.146: <witness> = import_ref Main//a, loc4_22, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst14 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.f99: %C.elem = import_ref Main//a, loc4_16, loaded [template = %.2fc]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -136,6 +141,10 @@ var a_val: a = {.v = b_val.v};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.146
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .v = imports.%import_ref.f99
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/alias/no_prelude/in_namespace.carbon b/toolchain/check/testdata/alias/no_prelude/in_namespace.carbon
index 6d820cd408b6..7cda047beb17 100644
--- a/toolchain/check/testdata/alias/no_prelude/in_namespace.carbon
+++ b/toolchain/check/testdata/alias/no_prelude/in_namespace.carbon
@@ -80,6 +80,10 @@ fn F() -> NS.a {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.v [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .v = %.loc11_16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/as/adapter_conversion.carbon b/toolchain/check/testdata/as/adapter_conversion.carbon
index 3f58e56ae5f7..8df4c4bfc9b5 100644
--- a/toolchain/check/testdata/as/adapter_conversion.carbon
+++ b/toolchain/check/testdata/as/adapter_conversion.carbon
@@ -270,6 +270,12 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y.871 [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x = %.loc5_8
+// CHECK:STDOUT:   .y = %.loc6_8
+// CHECK:STDOUT:   .Make = %Make.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -277,6 +283,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %A.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y.871 [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Make() -> %return.param_patt: %A {
@@ -403,6 +412,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %i32 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %i32.builtin [template = constants.%complete_type.f8a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -473,6 +485,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %.loc4_19 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -480,6 +495,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %A.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -487,6 +505,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %B.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -494,6 +515,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %C.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -571,6 +595,11 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   %.var.loc6: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y.871 [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x = %.loc5_8
+// CHECK:STDOUT:   .y = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -578,6 +607,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %A.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y.871 [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -677,6 +709,11 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   %.var.loc6: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y.871 [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x = %.loc5_8
+// CHECK:STDOUT:   .y = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -684,6 +721,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %A.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y.871 [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -765,6 +805,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT: class @Noncopyable {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Noncopyable
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A {
@@ -776,6 +819,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %.loc9_27 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %tuple.type.560 [template = constants.%complete_type.ce5]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %A) {
@@ -846,6 +892,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT: class @Noncopyable {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Noncopyable
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A {
@@ -857,6 +906,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %.loc9_27 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %tuple.type.560 [template = constants.%complete_type.ce5]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %A) {
@@ -939,6 +991,10 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.ed6 [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -946,6 +1002,9 @@ var b: B = {.x = 1} as B;
 // CHECK:STDOUT:   adapt_decl %A.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.ed6 [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/as/identity.carbon b/toolchain/check/testdata/as/identity.carbon
index 2e5a00ceae3d..38ff358fdb74 100644
--- a/toolchain/check/testdata/as/identity.carbon
+++ b/toolchain/check/testdata/as/identity.carbon
@@ -96,6 +96,9 @@ fn Initializing() {
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Value(%n.param_patt: %X) {
diff --git a/toolchain/check/testdata/as/no_prelude/tuple.carbon b/toolchain/check/testdata/as/no_prelude/tuple.carbon
index 0b762538b336..2b42c40c4dfc 100644
--- a/toolchain/check/testdata/as/no_prelude/tuple.carbon
+++ b/toolchain/check/testdata/as/no_prelude/tuple.carbon
@@ -63,6 +63,9 @@ fn Var() {
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Make() -> %X;
diff --git a/toolchain/check/testdata/as/overloaded.carbon b/toolchain/check/testdata/as/overloaded.carbon
index 955d7bcf781f..e11e87c8a0c4 100644
--- a/toolchain/check/testdata/as/overloaded.carbon
+++ b/toolchain/check/testdata/as/overloaded.carbon
@@ -151,6 +151,10 @@ let n: i32 = ((4 as i32) as X) as i32;
 // CHECK:STDOUT:   %.var: ref %X.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
+// CHECK:STDOUT:   .n = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Convert.2[%self.param_patt: %i32]() -> %return.param_patt: %X {
diff --git a/toolchain/check/testdata/builtins/bool/eq.carbon b/toolchain/check/testdata/builtins/bool/eq.carbon
index 3e7eb2e6078d..46dd4101a34b 100644
--- a/toolchain/check/testdata/builtins/bool/eq.carbon
+++ b/toolchain/check/testdata/builtins/bool/eq.carbon
@@ -49,6 +49,7 @@ var d: C(false == false) = True();
 // CHECK:STDOUT:   %B.patt: bool = symbolic_binding_pattern B, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.342: type = class_type @C, @C(%B) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %true: bool = bool_literal true [template]
@@ -217,6 +218,9 @@ var d: C(false == false) = True();
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.342
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -275,6 +279,7 @@ var d: C(false == false) = True();
 // CHECK:STDOUT:   %B.patt: bool = symbolic_binding_pattern B, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.342: type = class_type @C, @C(%B) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %true: bool = bool_literal true [template]
@@ -425,6 +430,9 @@ var d: C(false == false) = True();
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.342
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/builtins/bool/neq.carbon b/toolchain/check/testdata/builtins/bool/neq.carbon
index 63f406a0cc2b..4f3432f44d7a 100644
--- a/toolchain/check/testdata/builtins/bool/neq.carbon
+++ b/toolchain/check/testdata/builtins/bool/neq.carbon
@@ -49,6 +49,7 @@ var d: C(false != false) = False();
 // CHECK:STDOUT:   %B.patt: bool = symbolic_binding_pattern B, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.342: type = class_type @C, @C(%B) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %true: bool = bool_literal true [template]
@@ -217,6 +218,9 @@ var d: C(false != false) = False();
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.342
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -275,6 +279,7 @@ var d: C(false != false) = False();
 // CHECK:STDOUT:   %B.patt: bool = symbolic_binding_pattern B, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.342: type = class_type @C, @C(%B) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %true: bool = bool_literal true [template]
@@ -425,6 +430,9 @@ var d: C(false != false) = False();
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.342
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/builtins/float/eq.carbon b/toolchain/check/testdata/builtins/float/eq.carbon
index cd35b3bc03db..6406805f1b81 100644
--- a/toolchain/check/testdata/builtins/float/eq.carbon
+++ b/toolchain/check/testdata/builtins/float/eq.carbon
@@ -157,11 +157,17 @@ fn WrongResult(a: f64, b: f64) -> f64 = "float.eq";
 // CHECK:STDOUT: class @True {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%True
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @False {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%False
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Eq(%a.param_patt: f64, %b.param_patt: f64) -> bool = "float.eq";
diff --git a/toolchain/check/testdata/builtins/float/greater.carbon b/toolchain/check/testdata/builtins/float/greater.carbon
index d0e38306e986..af5e568fc8cb 100644
--- a/toolchain/check/testdata/builtins/float/greater.carbon
+++ b/toolchain/check/testdata/builtins/float/greater.carbon
@@ -177,11 +177,17 @@ fn RuntimeCallIsValid(a: f64, b: f64) -> bool {
 // CHECK:STDOUT: class @True {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%True
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @False {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%False
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Greater(%a.param_patt: f64, %b.param_patt: f64) -> bool = "float.greater";
diff --git a/toolchain/check/testdata/builtins/float/greater_eq.carbon b/toolchain/check/testdata/builtins/float/greater_eq.carbon
index efae08daf4f2..4d0520856317 100644
--- a/toolchain/check/testdata/builtins/float/greater_eq.carbon
+++ b/toolchain/check/testdata/builtins/float/greater_eq.carbon
@@ -177,11 +177,17 @@ fn RuntimeCallIsValid(a: f64, b: f64) -> bool {
 // CHECK:STDOUT: class @True {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%True
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @False {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%False
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @GreaterEq(%a.param_patt: f64, %b.param_patt: f64) -> bool = "float.greater_eq";
diff --git a/toolchain/check/testdata/builtins/float/less.carbon b/toolchain/check/testdata/builtins/float/less.carbon
index 1eddec5b9ecc..89adb5624314 100644
--- a/toolchain/check/testdata/builtins/float/less.carbon
+++ b/toolchain/check/testdata/builtins/float/less.carbon
@@ -177,11 +177,17 @@ fn RuntimeCallIsValid(a: f64, b: f64) -> bool {
 // CHECK:STDOUT: class @True {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%True
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @False {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%False
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Less(%a.param_patt: f64, %b.param_patt: f64) -> bool = "float.less";
diff --git a/toolchain/check/testdata/builtins/float/less_eq.carbon b/toolchain/check/testdata/builtins/float/less_eq.carbon
index 1138a0e976e2..7b9ae9cea29d 100644
--- a/toolchain/check/testdata/builtins/float/less_eq.carbon
+++ b/toolchain/check/testdata/builtins/float/less_eq.carbon
@@ -177,11 +177,17 @@ fn RuntimeCallIsValid(a: f64, b: f64) -> bool {
 // CHECK:STDOUT: class @True {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%True
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @False {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%False
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @LessEq(%a.param_patt: f64, %b.param_patt: f64) -> bool = "float.less_eq";
diff --git a/toolchain/check/testdata/builtins/float/neq.carbon b/toolchain/check/testdata/builtins/float/neq.carbon
index 06c9c60d0901..e2c6b9ca7895 100644
--- a/toolchain/check/testdata/builtins/float/neq.carbon
+++ b/toolchain/check/testdata/builtins/float/neq.carbon
@@ -157,11 +157,17 @@ fn WrongResult(a: f64, b: f64) -> f64 = "float.neq";
 // CHECK:STDOUT: class @True {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%True
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @False {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%False
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Neq(%a.param_patt: f64, %b.param_patt: f64) -> bool = "float.neq";
diff --git a/toolchain/check/testdata/class/access_modifers.carbon b/toolchain/check/testdata/class/access_modifers.carbon
index ac19ed573cdc..446cc071979f 100644
--- a/toolchain/check/testdata/class/access_modifers.carbon
+++ b/toolchain/check/testdata/class/access_modifers.carbon
@@ -237,6 +237,13 @@ class A {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.radius.251 [template = constants.%complete_type.5a5]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Circle
+// CHECK:STDOUT:   .radius [private] = %.loc5_21
+// CHECK:STDOUT:   .SOME_INTERNAL_CONSTANT [private] = %SOME_INTERNAL_CONSTANT
+// CHECK:STDOUT:   .SomeInternalFunction [private] = %SomeInternalFunction.decl
+// CHECK:STDOUT:   .Make = %Make.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @SomeInternalFunction() -> %i32 {
@@ -340,6 +347,10 @@ class A {
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x [protected] = %.loc5_18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Run() {
@@ -445,6 +456,13 @@ class A {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.radius [template = constants.%complete_type.5a5]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Circle
+// CHECK:STDOUT:   .radius [private] = %.loc5_21
+// CHECK:STDOUT:   .GetRadius = %GetRadius.decl
+// CHECK:STDOUT:   .SomeInternalFunction [private] = %SomeInternalFunction.decl
+// CHECK:STDOUT:   .Compute = %Compute.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @GetRadius[%self.param_patt: %Circle]() -> %i32 {
@@ -541,6 +559,10 @@ class A {
 // CHECK:STDOUT:   %x: %i32 = bind_name x, %.loc5_16.2
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x = %x
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -637,6 +659,11 @@ class A {
 // CHECK:STDOUT:   %y: %i32 = bind_name y, %.loc6_24.2
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x [protected] = %x
+// CHECK:STDOUT:   .y [private] = %y
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -682,6 +709,11 @@ class A {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .F [private] = %F.decl
+// CHECK:STDOUT:   .G [private] = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/class/adapter/adapt.carbon b/toolchain/check/testdata/class/adapter/adapt.carbon
index 27f862bb53f8..2bb5267e5fa7 100644
--- a/toolchain/check/testdata/class/adapter/adapt.carbon
+++ b/toolchain/check/testdata/class/adapter/adapt.carbon
@@ -111,6 +111,11 @@ interface I {
 // CHECK:STDOUT:   %.var.loc6: ref %SomeClass.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClass
+// CHECK:STDOUT:   .a = %.loc5_8
+// CHECK:STDOUT:   .b = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SomeClassAdapter {
@@ -118,6 +123,9 @@ interface I {
 // CHECK:STDOUT:   adapt_decl %SomeClass.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClassAdapter
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @StructAdapter {
@@ -129,6 +137,9 @@ interface I {
 // CHECK:STDOUT:   adapt_decl %struct_type.a.b [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%StructAdapter
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_not_extend.carbon
@@ -175,6 +186,10 @@ interface I {
 // CHECK:STDOUT:   %F.decl: %F.type.967 = fn_decl @F.1 [template = constants.%F.9eb] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Adapted
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptNotExtend {
@@ -182,6 +197,9 @@ interface I {
 // CHECK:STDOUT:   adapt_decl %Adapted.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptNotExtend
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1();
diff --git a/toolchain/check/testdata/class/adapter/adapt_copy.carbon b/toolchain/check/testdata/class/adapter/adapt_copy.carbon
index 9af99f2190f4..757ab8991b81 100644
--- a/toolchain/check/testdata/class/adapter/adapt_copy.carbon
+++ b/toolchain/check/testdata/class/adapter/adapt_copy.carbon
@@ -199,6 +199,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT:   adapt_decl %i32 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %i32.builtin [template = constants.%complete_type.f8a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptCopyable
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%c.param_patt: %AdaptCopyable) -> %AdaptCopyable {
@@ -339,6 +342,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT:   adapt_decl %.loc5_19 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %tuple.type.d07 [template = constants.%complete_type.65d]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptTuple
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%c.param_patt: %AdaptTuple) -> %return.param_patt: %AdaptTuple {
@@ -486,6 +492,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT: class @Noncopyable {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Noncopyable
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptNoncopyable {
@@ -493,6 +502,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT:   adapt_decl %Noncopyable.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptNoncopyable
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G(%a.param_patt: %AdaptNoncopyable) -> %return.param_patt: %AdaptNoncopyable {
@@ -563,6 +575,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT: class @Noncopyable {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Noncopyable
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptNoncopyableIndirect {
@@ -576,6 +591,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT:   adapt_decl %.loc9_32 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %tuple.type.c9a [template = constants.%complete_type.201]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptNoncopyableIndirect
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @H(%a.param_patt: %AdaptNoncopyableIndirect) -> %return.param_patt: %AdaptNoncopyableIndirect {
@@ -689,6 +707,9 @@ fn InTuple(c: (AdaptStruct, u32)) -> (AdaptStruct, u32) {
 // CHECK:STDOUT:   adapt_decl %struct_type.e.f [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.e.f [template = constants.%complete_type.511]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptStruct
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @I(%g.param_patt: %AdaptStruct) -> %return.param_patt: %AdaptStruct {
diff --git a/toolchain/check/testdata/class/adapter/extend_adapt.carbon b/toolchain/check/testdata/class/adapter/extend_adapt.carbon
index 7b8bc8cbbeb9..b3aa99c5f6bf 100644
--- a/toolchain/check/testdata/class/adapter/extend_adapt.carbon
+++ b/toolchain/check/testdata/class/adapter/extend_adapt.carbon
@@ -202,6 +202,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   adapt_decl %SomeClass.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClassAdapter
+// CHECK:STDOUT:   extend %SomeClass.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SomeClass {
@@ -226,6 +230,13 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClass
+// CHECK:STDOUT:   .a = %.loc7_8
+// CHECK:STDOUT:   .b = %.loc8_8
+// CHECK:STDOUT:   .StaticMemberFunction = %StaticMemberFunction.decl
+// CHECK:STDOUT:   .AdapterMethod = %AdapterMethod.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @StaticMemberFunction();
@@ -302,6 +313,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClass
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SomeClassAdapter {
@@ -309,6 +324,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   adapt_decl %SomeClass.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClassAdapter
+// CHECK:STDOUT:   extend %SomeClass.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1[%self.param_patt: %SomeClass]();
@@ -385,6 +404,11 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   %.var.loc6: ref %SomeClass.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClass
+// CHECK:STDOUT:   .a = %.loc5_8
+// CHECK:STDOUT:   .b = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SomeClassAdapter {
@@ -392,6 +416,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   adapt_decl %SomeClass.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SomeClassAdapter
+// CHECK:STDOUT:   extend %SomeClass.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %SomeClassAdapter) -> %i32 {
@@ -456,6 +484,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   adapt_decl %struct_type.a.b [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%StructAdapter
+// CHECK:STDOUT:   extend %struct_type.a.b
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %StructAdapter) -> %i32 {
@@ -521,6 +553,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   adapt_decl %.loc5_26 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %tuple.type.d07 [template = constants.%complete_type.65d]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%TupleAdapter
+// CHECK:STDOUT:   extend %.loc5_26
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %TupleAdapter) -> %i32 {
@@ -608,6 +644,10 @@ fn F(a: IntAdapter) -> i32 {
 // CHECK:STDOUT:   adapt_decl %.loc7_27.2 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %i32.builtin [template = constants.%complete_type.f8a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%IntAdapter
+// CHECK:STDOUT:   extend %.loc7_27.2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @MakeInt(%N.param_patt: Core.IntLiteral) -> type = "int.make_type_signed";
diff --git a/toolchain/check/testdata/class/adapter/fail_adapt_bad_decl.carbon b/toolchain/check/testdata/class/adapter/fail_adapt_bad_decl.carbon
index 7509ed5e8131..9582ac463a91 100644
--- a/toolchain/check/testdata/class/adapter/fail_adapt_bad_decl.carbon
+++ b/toolchain/check/testdata/class/adapter/fail_adapt_bad_decl.carbon
@@ -144,6 +144,9 @@ class C {
 // CHECK:STDOUT:   adapt_decl <error> [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Bad
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Use(%b.param_patt: %Bad) {
@@ -194,6 +197,10 @@ class C {
 // CHECK:STDOUT:   adapt_decl <error> [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Bad
+// CHECK:STDOUT:   extend <error>
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Use(%b.param_patt: %Bad) {
@@ -238,6 +245,9 @@ class C {
 // CHECK:STDOUT:   %.loc13: %empty_struct_type = struct_literal ()
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_tuple.type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%MultipleAdapts
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @MultipleAdaptsSameType {
@@ -247,6 +257,9 @@ class C {
 // CHECK:STDOUT:   %.loc25: %empty_tuple.type = tuple_literal ()
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_tuple.type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%MultipleAdaptsSameType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_bad_scope.carbon
@@ -302,5 +315,9 @@ class C {
 // CHECK:STDOUT:   %I.decl: type = interface_decl @I.2 [template = constants.%I.type.e30] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .I = %I.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/adapter/fail_adapt_bad_type.carbon b/toolchain/check/testdata/class/adapter/fail_adapt_bad_type.carbon
index f9cf1987285f..7dbf6dda3676 100644
--- a/toolchain/check/testdata/class/adapter/fail_adapt_bad_type.carbon
+++ b/toolchain/check/testdata/class/adapter/fail_adapt_bad_type.carbon
@@ -57,5 +57,8 @@ class AdaptIncomplete {
 // CHECK:STDOUT:   adapt_decl <error> [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptIncomplete
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/adapter/fail_adapt_modifiers.carbon b/toolchain/check/testdata/class/adapter/fail_adapt_modifiers.carbon
index 95249c47e766..7ec8bc4b7809 100644
--- a/toolchain/check/testdata/class/adapter/fail_adapt_modifiers.carbon
+++ b/toolchain/check/testdata/class/adapter/fail_adapt_modifiers.carbon
@@ -98,6 +98,9 @@ class C5 {
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C1 {
@@ -105,6 +108,9 @@ class C5 {
 // CHECK:STDOUT:   adapt_decl %B.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C2 {
@@ -112,6 +118,9 @@ class C5 {
 // CHECK:STDOUT:   adapt_decl %B.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C3 {
@@ -119,6 +128,9 @@ class C5 {
 // CHECK:STDOUT:   adapt_decl %B.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C4 {
@@ -126,6 +138,10 @@ class C5 {
 // CHECK:STDOUT:   adapt_decl %B.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C4
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C5 {
@@ -133,5 +149,9 @@ class C5 {
 // CHECK:STDOUT:   adapt_decl %B.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C5
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/adapter/fail_adapt_with_base.carbon b/toolchain/check/testdata/class/adapter/fail_adapt_with_base.carbon
index b23599769480..d7ea6f24a391 100644
--- a/toolchain/check/testdata/class/adapter/fail_adapt_with_base.carbon
+++ b/toolchain/check/testdata/class/adapter/fail_adapt_with_base.carbon
@@ -52,6 +52,9 @@ base class AdaptWithVirtual {
 // CHECK:STDOUT: class @Simple {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Simple
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptWithVirtual {
@@ -59,6 +62,10 @@ base class AdaptWithVirtual {
 // CHECK:STDOUT:   %Simple.ref: type = name_ref Simple, file.%Simple.decl [template = constants.%Simple]
 // CHECK:STDOUT:   adapt_decl %Simple.ref [template]
 // CHECK:STDOUT:   complete_type_witness = <error>
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptWithVirtual
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @F();
diff --git a/toolchain/check/testdata/class/adapter/fail_adapt_with_subobjects.carbon b/toolchain/check/testdata/class/adapter/fail_adapt_with_subobjects.carbon
index 055853d4c10a..cfd4385be98b 100644
--- a/toolchain/check/testdata/class/adapter/fail_adapt_with_subobjects.carbon
+++ b/toolchain/check/testdata/class/adapter/fail_adapt_with_subobjects.carbon
@@ -109,6 +109,9 @@ class AdaptWithBaseAndFields {
 // CHECK:STDOUT: class @Base {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptWithBase {
@@ -118,6 +121,11 @@ class AdaptWithBaseAndFields {
 // CHECK:STDOUT:   %Base.ref: type = name_ref Base, file.%Base.decl [template = constants.%Base]
 // CHECK:STDOUT:   %.loc15: %AdaptWithBase.elem = base_decl %Base.ref, element<invalid> [template]
 // CHECK:STDOUT:   complete_type_witness = <error>
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptWithBase
+// CHECK:STDOUT:   .base = %.loc15
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_adapt_with_fields.carbon
@@ -160,6 +168,10 @@ class AdaptWithBaseAndFields {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %.var: ref %AdaptWithField.elem = var <invalid>
 // CHECK:STDOUT:   complete_type_witness = <error>
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptWithField
+// CHECK:STDOUT:   .n = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptWithFields {
@@ -182,6 +194,12 @@ class AdaptWithBaseAndFields {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %.var.loc27: ref %AdaptWithFields.elem = var <invalid>
 // CHECK:STDOUT:   complete_type_witness = <error>
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptWithFields
+// CHECK:STDOUT:   .a = %.loc25_8
+// CHECK:STDOUT:   .b = %.loc26_8
+// CHECK:STDOUT:   .c = %.loc27_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_adapt_with_base_and_fields.carbon
@@ -219,6 +237,9 @@ class AdaptWithBaseAndFields {
 // CHECK:STDOUT: class @Base {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptWithBaseAndFields {
@@ -233,5 +254,11 @@ class AdaptWithBaseAndFields {
 // CHECK:STDOUT:   %.loc16_11: type = converted %.loc16_10, constants.%empty_struct_type [template = constants.%empty_struct_type]
 // CHECK:STDOUT:   adapt_decl %.loc16_11 [template]
 // CHECK:STDOUT:   complete_type_witness = <error>
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptWithBaseAndFields
+// CHECK:STDOUT:   .base = %.loc7
+// CHECK:STDOUT:   .n = %.loc8_8
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/adapter/init_adapt.carbon b/toolchain/check/testdata/class/adapter/init_adapt.carbon
index fdebedd7898f..5edc42253532 100644
--- a/toolchain/check/testdata/class/adapter/init_adapt.carbon
+++ b/toolchain/check/testdata/class/adapter/init_adapt.carbon
@@ -225,6 +225,11 @@ var e: C = MakeAdaptC();
 // CHECK:STDOUT:   %.var.loc6: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .a = %.loc5_8
+// CHECK:STDOUT:   .b = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptC {
@@ -232,6 +237,9 @@ var e: C = MakeAdaptC();
 // CHECK:STDOUT:   adapt_decl %C.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptC
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @MakeC() -> %C;
@@ -403,6 +411,11 @@ var e: C = MakeAdaptC();
 // CHECK:STDOUT:   %.var.loc6: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .a = %.loc5_8
+// CHECK:STDOUT:   .b = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AdaptC {
@@ -410,6 +423,9 @@ var e: C = MakeAdaptC();
 // CHECK:STDOUT:   adapt_decl %C.ref [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AdaptC
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @MakeC() -> %C;
diff --git a/toolchain/check/testdata/class/base.carbon b/toolchain/check/testdata/class/base.carbon
index 88f8453669eb..17c479356cf3 100644
--- a/toolchain/check/testdata/class/base.carbon
+++ b/toolchain/check/testdata/class/base.carbon
@@ -139,6 +139,10 @@ class Derived {
 // CHECK:STDOUT:   %.var: ref %Base.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.b.0a3 [template = constants.%complete_type.ba8]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .b = %.loc4_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -151,6 +155,12 @@ class Derived {
 // CHECK:STDOUT:   %.var: ref %Derived.elem.344 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d.f8f [template = constants.%complete_type.da6]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc8
+// CHECK:STDOUT:   .d = %.loc10_8
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Make() -> %return.param_patt: %Derived {
@@ -240,6 +250,9 @@ class Derived {
 // CHECK:STDOUT: class @Base {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -251,5 +264,9 @@ class Derived {
 // CHECK:STDOUT:   %Base.ref: type = name_ref Base, file.%Base.decl [template = constants.%Base]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.d [template = constants.%complete_type.860]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .d = %.loc7_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/base_field.carbon b/toolchain/check/testdata/class/base_field.carbon
index 79e2b3e362db..8e800056e3d4 100644
--- a/toolchain/check/testdata/class/base_field.carbon
+++ b/toolchain/check/testdata/class/base_field.carbon
@@ -101,6 +101,12 @@ fn Access(p: Derived*) -> i32* {
 // CHECK:STDOUT:   %.var.loc14: ref %Base.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.c [template = constants.%complete_type.ebc]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
+// CHECK:STDOUT:   .c = %.loc14_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -118,6 +124,13 @@ fn Access(p: Derived*) -> i32* {
 // CHECK:STDOUT:   %.var.loc21: ref %Derived.elem.344 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d.e.6a7 [template = constants.%complete_type.401]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc18
+// CHECK:STDOUT:   .d = %.loc20_8
+// CHECK:STDOUT:   .e = %.loc21_8
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Access(%p.param_patt: %ptr.404) -> %ptr.235 {
diff --git a/toolchain/check/testdata/class/base_function_unqualified.carbon b/toolchain/check/testdata/class/base_function_unqualified.carbon
index 65983bd650dc..0673d0c2c875 100644
--- a/toolchain/check/testdata/class/base_function_unqualified.carbon
+++ b/toolchain/check/testdata/class/base_function_unqualified.carbon
@@ -65,6 +65,10 @@ fn Derived.H() {
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -74,6 +78,13 @@ fn Derived.H() {
 // CHECK:STDOUT:   %H.decl: %H.type = fn_decl @H [template = constants.%H] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.15c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc16
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .H = %H.decl
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F();
diff --git a/toolchain/check/testdata/class/base_method.carbon b/toolchain/check/testdata/class/base_method.carbon
index 6c2ae4c9b287..273b1cd08804 100644
--- a/toolchain/check/testdata/class/base_method.carbon
+++ b/toolchain/check/testdata/class/base_method.carbon
@@ -120,6 +120,11 @@ fn Call(p: Derived*) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -127,6 +132,11 @@ fn Call(p: Derived*) {
 // CHECK:STDOUT:   %.loc22: %Derived.elem = base_decl %Base.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.b1e [template = constants.%complete_type.15c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc22
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[addr %self.param_patt: %ptr.11f]() {
diff --git a/toolchain/check/testdata/class/base_method_qualified.carbon b/toolchain/check/testdata/class/base_method_qualified.carbon
index 3579444ffb7b..0e3fe8b65a5d 100644
--- a/toolchain/check/testdata/class/base_method_qualified.carbon
+++ b/toolchain/check/testdata/class/base_method_qualified.carbon
@@ -176,6 +176,13 @@ fn PassDerivedToBaseIndirect(p: Derived*) -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.b1e [template = constants.%complete_type.15c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc19
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Base {
@@ -209,6 +216,11 @@ fn PassDerivedToBaseIndirect(p: Derived*) -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1[%self.param_patt: %Base]() -> %i32;
diff --git a/toolchain/check/testdata/class/base_method_shadow.carbon b/toolchain/check/testdata/class/base_method_shadow.carbon
index d4a3ac659bf4..ae3d7ce703db 100644
--- a/toolchain/check/testdata/class/base_method_shadow.carbon
+++ b/toolchain/check/testdata/class/base_method_shadow.carbon
@@ -137,6 +137,10 @@ fn Call(a: A*, b: B*, c: C*, d: D*) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -156,6 +160,12 @@ fn Call(a: A*, b: B*, c: C*, d: D*) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.953 [template = constants.%complete_type.020]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc16
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -175,6 +185,12 @@ fn Call(a: A*, b: B*, c: C*, d: D*) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc21
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -182,6 +198,11 @@ fn Call(a: A*, b: B*, c: C*, d: D*) {
 // CHECK:STDOUT:   %.loc26: %D.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .base = %.loc26
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1[addr %self.param_patt: %ptr.6db]();
diff --git a/toolchain/check/testdata/class/basic.carbon b/toolchain/check/testdata/class/basic.carbon
index 3a15bd69690d..8c0bc4b66c0c 100644
--- a/toolchain/check/testdata/class/basic.carbon
+++ b/toolchain/check/testdata/class/basic.carbon
@@ -140,6 +140,12 @@ fn Run() -> i32 {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.k [template = constants.%complete_type.954]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .k = %.loc18_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%n.param_patt: %i32) -> %i32 {
diff --git a/toolchain/check/testdata/class/complete_in_member_fn.carbon b/toolchain/check/testdata/class/complete_in_member_fn.carbon
index b0f2450cc796..c36ff156ec92 100644
--- a/toolchain/check/testdata/class/complete_in_member_fn.carbon
+++ b/toolchain/check/testdata/class/complete_in_member_fn.carbon
@@ -66,6 +66,11 @@ class C {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .a = %.loc14_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%c.param_patt: %C) -> %i32 {
diff --git a/toolchain/check/testdata/class/compound_field.carbon b/toolchain/check/testdata/class/compound_field.carbon
index bb044d4dd457..252b5376309d 100644
--- a/toolchain/check/testdata/class/compound_field.carbon
+++ b/toolchain/check/testdata/class/compound_field.carbon
@@ -168,6 +168,12 @@ fn AccessBaseIndirect(p: Derived*) -> i32* {
 // CHECK:STDOUT:   %.var.loc14: ref %Base.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.c [template = constants.%complete_type.ebc]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
+// CHECK:STDOUT:   .c = %.loc14_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -185,6 +191,13 @@ fn AccessBaseIndirect(p: Derived*) -> i32* {
 // CHECK:STDOUT:   %.var.loc21: ref %Derived.elem.344 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d.e.6a7 [template = constants.%complete_type.401]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc18
+// CHECK:STDOUT:   .d = %.loc20_8
+// CHECK:STDOUT:   .e = %.loc21_8
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @AccessDerived(%d.param_patt: %Derived) -> %i32 {
diff --git a/toolchain/check/testdata/class/cross_package_import.carbon b/toolchain/check/testdata/class/cross_package_import.carbon
index 6cad56964262..4d924c2cb4d9 100644
--- a/toolchain/check/testdata/class/cross_package_import.carbon
+++ b/toolchain/check/testdata/class/cross_package_import.carbon
@@ -127,6 +127,9 @@ var c: Other.C = {};
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- other_extern.carbon
@@ -201,6 +204,7 @@ var c: Other.C = {};
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//other_define, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Other//other_define, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//other_define, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -225,6 +229,9 @@ var c: Other.C = {};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "other_define.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -305,6 +312,7 @@ var c: Other.C = {};
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//other_define, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Other//other_define, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//other_define, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -329,6 +337,9 @@ var c: Other.C = {};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "other_define.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -361,6 +372,7 @@ var c: Other.C = {};
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//other_define, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Other//other_define, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//other_define, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -385,6 +397,9 @@ var c: Other.C = {};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "other_define.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/class/derived_to_base.carbon b/toolchain/check/testdata/class/derived_to_base.carbon
index 58d3501593a3..82889589029c 100644
--- a/toolchain/check/testdata/class/derived_to_base.carbon
+++ b/toolchain/check/testdata/class/derived_to_base.carbon
@@ -209,6 +209,10 @@ fn ConvertInit() {
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.ba9 [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .a = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -221,6 +225,12 @@ fn ConvertInit() {
 // CHECK:STDOUT:   %.var: ref %B.elem.5c3 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.b.b44 [template = constants.%complete_type.725]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc16
+// CHECK:STDOUT:   .b = %.loc17_8
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -233,6 +243,12 @@ fn ConvertInit() {
 // CHECK:STDOUT:   %.var: ref %C.elem.646 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.c.8e2 [template = constants.%complete_type.58a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc21
+// CHECK:STDOUT:   .c = %.loc22_8
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ConvertCToB(%p.param_patt: %ptr.019) -> %ptr.e79 {
diff --git a/toolchain/check/testdata/class/fail_abstract.carbon b/toolchain/check/testdata/class/fail_abstract.carbon
index 9ba6268d9472..a28a52e1266c 100644
--- a/toolchain/check/testdata/class/fail_abstract.carbon
+++ b/toolchain/check/testdata/class/fail_abstract.carbon
@@ -219,6 +219,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Contains {
@@ -229,6 +232,10 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT:   %.var: ref <error> = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Contains
+// CHECK:STDOUT:   .a = %.loc15_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_abstract_var.carbon
@@ -262,6 +269,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Var() {
@@ -314,6 +324,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %Abstract) {
@@ -357,6 +370,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Adapter {
@@ -364,6 +380,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT:   adapt_decl <error> [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Adapter
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- define_and_call_abstract_param.carbon
@@ -416,6 +435,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Param(%a.param_patt: %Abstract);
@@ -480,6 +502,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -492,6 +517,12 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT:   %.var: ref %Derived.elem.344 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d.c44 [template = constants.%complete_type.32a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc8
+// CHECK:STDOUT:   .d = %.loc10_8
+// CHECK:STDOUT:   extend %Abstract.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Make() -> %return.param_patt: %Derived {
@@ -556,6 +587,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -568,6 +602,12 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT:   %.var: ref %Derived.elem.344 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d [template = constants.%complete_type.32a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc8
+// CHECK:STDOUT:   .d = %.loc10_8
+// CHECK:STDOUT:   extend %Abstract.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Return(%a.param_patt: %Abstract) -> %return.param_patt: %Abstract {
@@ -636,6 +676,10 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT:   %.var: ref %Abstract.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
+// CHECK:STDOUT:   .a = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -648,6 +692,12 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT:   %.var: ref %Derived.elem.344 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.d.c44 [template = constants.%complete_type.32a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .d = %.loc11_8
+// CHECK:STDOUT:   extend %Abstract.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Access(%d.param_patt: %Derived) -> %i32 {
@@ -690,6 +740,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -745,6 +798,9 @@ fn CallReturnAbstract() {
 // CHECK:STDOUT: class @Abstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ReturnAbstract() -> %Abstract;
diff --git a/toolchain/check/testdata/class/fail_addr_not_self.carbon b/toolchain/check/testdata/class/fail_addr_not_self.carbon
index d2e0e6542428..94c90ae5a5a6 100644
--- a/toolchain/check/testdata/class/fail_addr_not_self.carbon
+++ b/toolchain/check/testdata/class/fail_addr_not_self.carbon
@@ -78,6 +78,11 @@ class Class {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%a.loc16_13.2: %ptr) {
diff --git a/toolchain/check/testdata/class/fail_addr_self.carbon b/toolchain/check/testdata/class/fail_addr_self.carbon
index 961da001c456..4264c10a6d28 100644
--- a/toolchain/check/testdata/class/fail_addr_self.carbon
+++ b/toolchain/check/testdata/class/fail_addr_self.carbon
@@ -107,6 +107,11 @@ fn F(c: Class, p: Class*) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1[addr %self.param_patt: %ptr.e71]();
diff --git a/toolchain/check/testdata/class/fail_base_bad_type.carbon b/toolchain/check/testdata/class/fail_base_bad_type.carbon
index 64ce3f397fa6..d575bb1bdaef 100644
--- a/toolchain/check/testdata/class/fail_base_bad_type.carbon
+++ b/toolchain/check/testdata/class/fail_base_bad_type.carbon
@@ -229,6 +229,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc9: <error> = base_decl <error>, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromError
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @AccessMemberWithInvalidBaseError(%p.param_patt: %ptr) -> %i32 {
@@ -292,6 +297,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc12_18: <error> = base_decl <error>, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromNonType
+// CHECK:STDOUT:   .base = %.loc12_18
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @AccessMemberWithInvalidBasNonType(%p.param_patt: %ptr) -> %i32 {
@@ -379,6 +389,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc9: %DeriveFromi32.elem = base_decl %i32, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.386]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromi32
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   extend %i32
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ConvertToBadBasei32(%p.param_patt: %ptr.45c) -> %ptr.235 {
@@ -479,6 +494,9 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT: class @Base {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @DeriveFromTuple {
@@ -488,6 +506,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc11_23: <error> = base_decl <error>, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromTuple
+// CHECK:STDOUT:   .base = %.loc11_23
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ConvertToBadBaseTuple(%p.param_patt: %ptr.340) -> %ptr.1ab {
@@ -587,6 +610,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc11: <error> = base_decl <error>, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromStruct
+// CHECK:STDOUT:   .base = %.loc11
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ConvertToBadBaseStruct(%p.param_patt: %ptr.df0) -> %ptr.3ee {
@@ -682,6 +710,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc18: <error> = base_decl <error>, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromIncomplete
+// CHECK:STDOUT:   .base = %.loc18
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ConvertToBadBaseIncomplete(%p.param_patt: %ptr.089) -> %ptr.c62 {
@@ -803,6 +836,10 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.var: ref %Final.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Final
+// CHECK:STDOUT:   .a = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @DeriveFromFinal {
@@ -810,6 +847,11 @@ fn AccessMemberWithInvalidBaseFinal_NoMember(p: DeriveFromFinal*) -> i32 {
 // CHECK:STDOUT:   %.loc13: %DeriveFromFinal.elem = base_decl %Final.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.dae [template = constants.%complete_type.970]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%DeriveFromFinal
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   extend %Final.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ConvertToBadBaseFinal(%p.param_patt: %ptr.160) -> %ptr.5f6 {
diff --git a/toolchain/check/testdata/class/fail_base_method_define.carbon b/toolchain/check/testdata/class/fail_base_method_define.carbon
index b5e99ce5f535..2a6502ace813 100644
--- a/toolchain/check/testdata/class/fail_base_method_define.carbon
+++ b/toolchain/check/testdata/class/fail_base_method_define.carbon
@@ -78,12 +78,21 @@ fn D.C.F() {}
 // CHECK:STDOUT:   %C.decl: type = class_decl @C [template = constants.%C] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .C = %C.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %F.decl: %F.type.b77 = fn_decl @F.2 [template = constants.%F.a5f] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -91,6 +100,12 @@ fn D.C.F() {}
 // CHECK:STDOUT:   %.loc20: %D.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .base = %.loc20
+// CHECK:STDOUT:   .F = file.%F.decl
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1();
diff --git a/toolchain/check/testdata/class/fail_base_misplaced.carbon b/toolchain/check/testdata/class/fail_base_misplaced.carbon
index ece0ddd9258d..5778ee39c94e 100644
--- a/toolchain/check/testdata/class/fail_base_misplaced.carbon
+++ b/toolchain/check/testdata/class/fail_base_misplaced.carbon
@@ -71,12 +71,19 @@ class C {
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %F.decl: %F.type.c29 = fn_decl @F.2 [template = constants.%F.437] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1() {
diff --git a/toolchain/check/testdata/class/fail_base_modifiers.carbon b/toolchain/check/testdata/class/fail_base_modifiers.carbon
index fbefcaa34734..9a15ec5572c9 100644
--- a/toolchain/check/testdata/class/fail_base_modifiers.carbon
+++ b/toolchain/check/testdata/class/fail_base_modifiers.carbon
@@ -97,6 +97,9 @@ class C4 {
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C1 {
@@ -104,6 +107,11 @@ class C4 {
 // CHECK:STDOUT:   %.loc18: %C1.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C1
+// CHECK:STDOUT:   .base = %.loc18
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C2 {
@@ -111,6 +119,10 @@ class C4 {
 // CHECK:STDOUT:   %.loc30: %C2.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C2
+// CHECK:STDOUT:   .base = %.loc30
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C3 {
@@ -118,6 +130,11 @@ class C4 {
 // CHECK:STDOUT:   %.loc41: %C3.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C3
+// CHECK:STDOUT:   .base = %.loc41
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C4 {
@@ -125,5 +142,10 @@ class C4 {
 // CHECK:STDOUT:   %.loc52: %C4.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C4
+// CHECK:STDOUT:   .base = %.loc52
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_base_no_extend.carbon b/toolchain/check/testdata/class/fail_base_no_extend.carbon
index 0e37dddaeac5..444d7fa2aee0 100644
--- a/toolchain/check/testdata/class/fail_base_no_extend.carbon
+++ b/toolchain/check/testdata/class/fail_base_no_extend.carbon
@@ -51,6 +51,9 @@ class C {
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -58,5 +61,9 @@ class C {
 // CHECK:STDOUT:   %.loc18: %C.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_base_repeated.carbon b/toolchain/check/testdata/class/fail_base_repeated.carbon
index 01082b1cef26..fcf11f3ba855 100644
--- a/toolchain/check/testdata/class/fail_base_repeated.carbon
+++ b/toolchain/check/testdata/class/fail_base_repeated.carbon
@@ -76,11 +76,17 @@ class D {
 // CHECK:STDOUT: class @B1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -89,6 +95,11 @@ class D {
 // CHECK:STDOUT:   %B2.ref: type = name_ref B2, file.%B2.decl [template = constants.%B2]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.5ac]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc15
+// CHECK:STDOUT:   extend %B1.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -97,5 +108,10 @@ class D {
 // CHECK:STDOUT:   %B1.ref.loc36: type = name_ref B1, file.%B1.decl [template = constants.%B1]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.5ac]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .base = %.loc28
+// CHECK:STDOUT:   extend %B1.ref.loc28
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_base_unbound.carbon b/toolchain/check/testdata/class/fail_base_unbound.carbon
index f7e2db9ed437..18610c194950 100644
--- a/toolchain/check/testdata/class/fail_base_unbound.carbon
+++ b/toolchain/check/testdata/class/fail_base_unbound.carbon
@@ -59,6 +59,9 @@ let b: B = C.base;
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -66,6 +69,11 @@ let b: B = C.base;
 // CHECK:STDOUT:   %.loc14: %C.elem = base_decl %B.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc14
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/class/fail_compound_type_mismatch.carbon b/toolchain/check/testdata/class/fail_compound_type_mismatch.carbon
index 60c1a86bc6b6..30446233fa89 100644
--- a/toolchain/check/testdata/class/fail_compound_type_mismatch.carbon
+++ b/toolchain/check/testdata/class/fail_compound_type_mismatch.carbon
@@ -87,6 +87,10 @@ fn AccessBInA(a: A) -> i32 {
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .a = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -97,6 +101,10 @@ fn AccessBInA(a: A) -> i32 {
 // CHECK:STDOUT:   %.var: ref %B.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.b [template = constants.%complete_type.ba8]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .b = %.loc16_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @AccessBInA(%a.param_patt: %A) -> %i32 {
diff --git a/toolchain/check/testdata/class/fail_convert_to_invalid.carbon b/toolchain/check/testdata/class/fail_convert_to_invalid.carbon
index 82d83ad80b7d..6cb4e4b8c7c4 100644
--- a/toolchain/check/testdata/class/fail_convert_to_invalid.carbon
+++ b/toolchain/check/testdata/class/fail_convert_to_invalid.carbon
@@ -63,6 +63,10 @@ fn Make() -> C {
 // CHECK:STDOUT:   %.var: ref <error> = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .a = %.loc16_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Make() -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/class/fail_derived_to_base.carbon b/toolchain/check/testdata/class/fail_derived_to_base.carbon
index 83ff2d0dd5e0..73acf540dfc2 100644
--- a/toolchain/check/testdata/class/fail_derived_to_base.carbon
+++ b/toolchain/check/testdata/class/fail_derived_to_base.carbon
@@ -136,6 +136,10 @@ fn ConvertIncomplete(p: Incomplete*) -> A2* { return p; }
 // CHECK:STDOUT:   %.var: ref %A1.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A1
+// CHECK:STDOUT:   .a = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A2 {
@@ -146,6 +150,10 @@ fn ConvertIncomplete(p: Incomplete*) -> A2* { return p; }
 // CHECK:STDOUT:   %.var: ref %A2.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A2
+// CHECK:STDOUT:   .a = %.loc16_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B2 {
@@ -158,6 +166,12 @@ fn ConvertIncomplete(p: Incomplete*) -> A2* { return p; }
 // CHECK:STDOUT:   %.var: ref %B2.elem.4b2 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.b.618 [template = constants.%complete_type.92f]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B2
+// CHECK:STDOUT:   .base = %.loc20
+// CHECK:STDOUT:   .b = %.loc21_8
+// CHECK:STDOUT:   extend %A2.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Incomplete;
diff --git a/toolchain/check/testdata/class/fail_extend_cycle.carbon b/toolchain/check/testdata/class/fail_extend_cycle.carbon
index ab29dacab3d8..1cc52dc8641c 100644
--- a/toolchain/check/testdata/class/fail_extend_cycle.carbon
+++ b/toolchain/check/testdata/class/fail_extend_cycle.carbon
@@ -68,6 +68,9 @@ base class A {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -75,6 +78,11 @@ base class A {
 // CHECK:STDOUT:   %.loc16: %B.elem = base_decl %A.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.020]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc16
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
@@ -87,5 +95,11 @@ base class A {
 // CHECK:STDOUT:   %.var: ref <error> = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.a95
+// CHECK:STDOUT:   .base = %.loc27
+// CHECK:STDOUT:   .c = %.loc32_8
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_field_modifiers.carbon b/toolchain/check/testdata/class/fail_field_modifiers.carbon
index 19eba3cb0273..da6497ef5fee 100644
--- a/toolchain/check/testdata/class/fail_field_modifiers.carbon
+++ b/toolchain/check/testdata/class/fail_field_modifiers.carbon
@@ -119,5 +119,12 @@ class Class {
 // CHECK:STDOUT:   %m: %i32 = bind_name m, %.loc35_22.2
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.j.k [template = constants.%complete_type.cf7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .j = %.loc17_16
+// CHECK:STDOUT:   .k = %.loc23_14
+// CHECK:STDOUT:   .l = %l
+// CHECK:STDOUT:   .m = %m
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_generic_method.carbon b/toolchain/check/testdata/class/fail_generic_method.carbon
index a2fb77f29fa1..7f5bc7e4426d 100644
--- a/toolchain/check/testdata/class/fail_generic_method.carbon
+++ b/toolchain/check/testdata/class/fail_generic_method.carbon
@@ -133,6 +133,11 @@ fn Class(N:! i32).F[self: Self](n: T) {}
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type.loc14_1.1: <witness> = complete_type_witness %struct_type.a [symbolic = %complete_type.loc14_1.2 (constants.%complete_type.f1b)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc14_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .a = %.loc12_8
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_import_misuses.carbon b/toolchain/check/testdata/class/fail_import_misuses.carbon
index ffb3f1ae7de9..bdd0bc42cb25 100644
--- a/toolchain/check/testdata/class/fail_import_misuses.carbon
+++ b/toolchain/check/testdata/class/fail_import_misuses.carbon
@@ -74,6 +74,9 @@ var a: Incomplete;
 // CHECK:STDOUT: class @Empty {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Empty
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Incomplete;
@@ -96,6 +99,7 @@ var a: Incomplete;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc5_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.fd7 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -119,11 +123,17 @@ var a: Incomplete;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Empty [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.fd7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.a95
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Incomplete [from "a.carbon"];
diff --git a/toolchain/check/testdata/class/fail_incomplete.carbon b/toolchain/check/testdata/class/fail_incomplete.carbon
index b979c26d7f5d..a0ef07a114bd 100644
--- a/toolchain/check/testdata/class/fail_incomplete.carbon
+++ b/toolchain/check/testdata/class/fail_incomplete.carbon
@@ -378,6 +378,10 @@ class C {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%IncompleteAddrSelf
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @.1() {
@@ -498,5 +502,9 @@ class C {
 // CHECK:STDOUT:   %.var: ref <error> = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .c = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_init.carbon b/toolchain/check/testdata/class/fail_init.carbon
index 2bce4ac24f23..a6f42a95b784 100644
--- a/toolchain/check/testdata/class/fail_init.carbon
+++ b/toolchain/check/testdata/class/fail_init.carbon
@@ -90,6 +90,11 @@ fn F() {
 // CHECK:STDOUT:   %.var.loc13: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/class/fail_init_as_inplace.carbon b/toolchain/check/testdata/class/fail_init_as_inplace.carbon
index f07cf5a8defd..6625c075ef78 100644
--- a/toolchain/check/testdata/class/fail_init_as_inplace.carbon
+++ b/toolchain/check/testdata/class/fail_init_as_inplace.carbon
@@ -103,6 +103,11 @@ fn F() {
 // CHECK:STDOUT:   %.var.loc13: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G(%p.param_patt: %ptr.e71);
diff --git a/toolchain/check/testdata/class/fail_memaccess_category.carbon b/toolchain/check/testdata/class/fail_memaccess_category.carbon
index a4f772294079..0f782712e36d 100644
--- a/toolchain/check/testdata/class/fail_memaccess_category.carbon
+++ b/toolchain/check/testdata/class/fail_memaccess_category.carbon
@@ -107,6 +107,10 @@ fn F(s: {.a: A}, b: B) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -117,6 +121,10 @@ fn F(s: {.a: A}, b: B) {
 // CHECK:STDOUT:   %.var: ref %B.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.72c [template = constants.%complete_type.2b9]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .a = %.loc16_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1[addr %self.param_patt: %ptr.6db]();
diff --git a/toolchain/check/testdata/class/fail_member_of_let.carbon b/toolchain/check/testdata/class/fail_member_of_let.carbon
index 7cc39fd24d6a..c913669636bf 100644
--- a/toolchain/check/testdata/class/fail_member_of_let.carbon
+++ b/toolchain/check/testdata/class/fail_member_of_let.carbon
@@ -75,6 +75,10 @@ fn T.F() {}
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32;
diff --git a/toolchain/check/testdata/class/fail_method.carbon b/toolchain/check/testdata/class/fail_method.carbon
index 3a0d08b05808..d726c19f30d5 100644
--- a/toolchain/check/testdata/class/fail_method.carbon
+++ b/toolchain/check/testdata/class/fail_method.carbon
@@ -103,6 +103,11 @@ fn F(c: Class) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .NoSelf = %NoSelf.decl
+// CHECK:STDOUT:   .WithSelf = %WithSelf.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @NoSelf();
diff --git a/toolchain/check/testdata/class/fail_method_modifiers.carbon b/toolchain/check/testdata/class/fail_method_modifiers.carbon
index cfb972856cf4..1ae45fb8f132 100644
--- a/toolchain/check/testdata/class/fail_method_modifiers.carbon
+++ b/toolchain/check/testdata/class/fail_method_modifiers.carbon
@@ -115,6 +115,11 @@ base class BaseClass {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FinalClass
+// CHECK:STDOUT:   .Abstract = %Abstract.decl
+// CHECK:STDOUT:   .Virtual = %Virtual.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AbstractClass {
@@ -136,6 +141,11 @@ base class BaseClass {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AbstractClass
+// CHECK:STDOUT:   .Default = %Default.decl
+// CHECK:STDOUT:   .Final = %Final.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @BaseClass {
@@ -149,6 +159,10 @@ base class BaseClass {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%BaseClass
+// CHECK:STDOUT:   .Abstract = %Abstract.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Abstract.1[%self.param_patt: %FinalClass]();
diff --git a/toolchain/check/testdata/class/fail_method_redefinition.carbon b/toolchain/check/testdata/class/fail_method_redefinition.carbon
index fe67182ef340..79f7d6053145 100644
--- a/toolchain/check/testdata/class/fail_method_redefinition.carbon
+++ b/toolchain/check/testdata/class/fail_method_redefinition.carbon
@@ -53,6 +53,10 @@ class Class {
 // CHECK:STDOUT:   %.decl: %.type = fn_decl @.1 [template = constants.%.d22] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/class/fail_modifiers.carbon b/toolchain/check/testdata/class/fail_modifiers.carbon
index 2df159ace7bf..4759d38c1186 100644
--- a/toolchain/check/testdata/class/fail_modifiers.carbon
+++ b/toolchain/check/testdata/class/fail_modifiers.carbon
@@ -165,21 +165,33 @@ fn AbstractWithDefinition.G() {
 // CHECK:STDOUT: class @TwoAbstract {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%TwoAbstract
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Virtual {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Virtual
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @WrongOrder {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%WrongOrder
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AbstractAndBase {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AbstractAndBase
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AbstractWithDefinition {
@@ -188,6 +200,11 @@ fn AbstractWithDefinition.G() {
 // CHECK:STDOUT:   %.loc92: <vtable> = vtable (%F.decl, %G.decl) [template = constants.%.9a5]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type.513]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AbstractWithDefinition
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: abstract fn @F() {
diff --git a/toolchain/check/testdata/class/fail_out_of_line_decl.carbon b/toolchain/check/testdata/class/fail_out_of_line_decl.carbon
index 83a60d3e2cfd..3088bd8022aa 100644
--- a/toolchain/check/testdata/class/fail_out_of_line_decl.carbon
+++ b/toolchain/check/testdata/class/fail_out_of_line_decl.carbon
@@ -46,6 +46,10 @@ fn C.F() {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = file.%F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/class/fail_redeclaration_scope.carbon b/toolchain/check/testdata/class/fail_redeclaration_scope.carbon
index 16d448522b2b..4d9a34d7a59c 100644
--- a/toolchain/check/testdata/class/fail_redeclaration_scope.carbon
+++ b/toolchain/check/testdata/class/fail_redeclaration_scope.carbon
@@ -65,6 +65,10 @@ class Y {
 // CHECK:STDOUT:   %B.decl: type = class_decl @B.2 [template = constants.%B.29a] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A.466
+// CHECK:STDOUT:   .B = %B.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X {
@@ -72,17 +76,28 @@ class Y {
 // CHECK:STDOUT:   %B.decl: type = class_decl @B.1 [template = constants.%B.d5b] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
+// CHECK:STDOUT:   .A = %A.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A.2 {
 // CHECK:STDOUT:   %B.decl: type = class_decl @B.1 [template = constants.%B.d5b] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A.197
+// CHECK:STDOUT:   .B = %B.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B.d5b
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B.2;
@@ -91,10 +106,16 @@ class Y {
 // CHECK:STDOUT:   %.decl: type = class_decl @.1 [template = constants.%.65d] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Y
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.65d
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_redefinition.carbon b/toolchain/check/testdata/class/fail_redefinition.carbon
index e53962ab90de..38de3fd672c0 100644
--- a/toolchain/check/testdata/class/fail_redefinition.carbon
+++ b/toolchain/check/testdata/class/fail_redefinition.carbon
@@ -95,6 +95,13 @@ fn Class.I() {}
 // CHECK:STDOUT:   %I.decl: %I.type.2b6 = fn_decl @I.1 [template = constants.%I.c9a] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .H = %H.decl
+// CHECK:STDOUT:   .I = %I.decl
+// CHECK:STDOUT:   .G = file.%G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.2 {
@@ -103,6 +110,12 @@ fn Class.I() {}
 // CHECK:STDOUT:   %I.decl: %I.type.b27 = fn_decl @I.2 [template = constants.%I.a7f] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.a95
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .H = %H.decl
+// CHECK:STDOUT:   .I = %I.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/class/fail_scope.carbon b/toolchain/check/testdata/class/fail_scope.carbon
index 47d9fcf295a0..92a2a0dca3bd 100644
--- a/toolchain/check/testdata/class/fail_scope.carbon
+++ b/toolchain/check/testdata/class/fail_scope.carbon
@@ -84,6 +84,10 @@ fn G() -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32 {
diff --git a/toolchain/check/testdata/class/fail_self.carbon b/toolchain/check/testdata/class/fail_self.carbon
index c4eb6bd1a58b..a27498f8b5b8 100644
--- a/toolchain/check/testdata/class/fail_self.carbon
+++ b/toolchain/check/testdata/class/fail_self.carbon
@@ -137,6 +137,11 @@ fn CallWrongSelf(ws: WrongSelf) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @WrongSelf {
@@ -150,6 +155,10 @@ fn CallWrongSelf(ws: WrongSelf) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%WrongSelf
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1(%self.param_patt: %Class) {
diff --git a/toolchain/check/testdata/class/fail_self_param.carbon b/toolchain/check/testdata/class/fail_self_param.carbon
index 37be623c5cc0..1233d387a460 100644
--- a/toolchain/check/testdata/class/fail_self_param.carbon
+++ b/toolchain/check/testdata/class/fail_self_param.carbon
@@ -68,6 +68,9 @@ var v: C(0);
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = <error>
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/fail_self_type_member.carbon b/toolchain/check/testdata/class/fail_self_type_member.carbon
index a6a7bbca9e9d..79bec632ff11 100644
--- a/toolchain/check/testdata/class/fail_self_type_member.carbon
+++ b/toolchain/check/testdata/class/fail_self_type_member.carbon
@@ -45,6 +45,10 @@ fn F() -> bool {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.b [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .b = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> bool;
diff --git a/toolchain/check/testdata/class/fail_unbound_field.carbon b/toolchain/check/testdata/class/fail_unbound_field.carbon
index c6101ffeda3f..78c3fe730405 100644
--- a/toolchain/check/testdata/class/fail_unbound_field.carbon
+++ b/toolchain/check/testdata/class/fail_unbound_field.carbon
@@ -86,6 +86,11 @@ fn G() -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.field [template = constants.%complete_type.d48]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .field = %.loc12_12
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32 {
diff --git a/toolchain/check/testdata/class/fail_unknown_member.carbon b/toolchain/check/testdata/class/fail_unknown_member.carbon
index a96d8075c103..da894fb1cd4e 100644
--- a/toolchain/check/testdata/class/fail_unknown_member.carbon
+++ b/toolchain/check/testdata/class/fail_unknown_member.carbon
@@ -74,6 +74,10 @@ fn G(c: Class) -> i32 {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .n = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G(%c.param_patt: %Class) -> %i32 {
diff --git a/toolchain/check/testdata/class/field_access.carbon b/toolchain/check/testdata/class/field_access.carbon
index 5ca309f7ea2b..d2d166e63268 100644
--- a/toolchain/check/testdata/class/field_access.carbon
+++ b/toolchain/check/testdata/class/field_access.carbon
@@ -79,6 +79,11 @@ fn Run() {
 // CHECK:STDOUT:   %.var.loc13: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.j.k [template = constants.%complete_type.cf7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .j = %.loc12_8
+// CHECK:STDOUT:   .k = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Run() {
diff --git a/toolchain/check/testdata/class/field_access_in_value.carbon b/toolchain/check/testdata/class/field_access_in_value.carbon
index 74c8dabd257d..4202f908c4d3 100644
--- a/toolchain/check/testdata/class/field_access_in_value.carbon
+++ b/toolchain/check/testdata/class/field_access_in_value.carbon
@@ -80,6 +80,11 @@ fn Test() {
 // CHECK:STDOUT:   %.var.loc13: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.j.k [template = constants.%complete_type.cf7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .j = %.loc12_8
+// CHECK:STDOUT:   .k = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Test() {
diff --git a/toolchain/check/testdata/class/generic/adapt.carbon b/toolchain/check/testdata/class/generic/adapt.carbon
index 2b227bdbca17..93cab46a40df 100644
--- a/toolchain/check/testdata/class/generic/adapt.carbon
+++ b/toolchain/check/testdata/class/generic/adapt.carbon
@@ -205,6 +205,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @C.%C.elem (%C.elem.66c) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.x.2ac [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.433)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .x = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -216,6 +220,9 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:   adapt_decl %C [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.ed6 [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Adapter
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Access(%a.param_patt: %Adapter) -> %i32 {
@@ -287,8 +294,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.b5f: <witness> = import_ref Main//adapt_specific_type, loc6_1, loaded [symbolic = @C.%complete_type (constants.%complete_type.433)]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref Main//adapt_specific_type, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.262: @C.%C.elem (%C.elem.66c) = import_ref Main//adapt_specific_type, loc5_8, loaded [template = %.22b]
 // CHECK:STDOUT:   %import_ref.709: <witness> = import_ref Main//adapt_specific_type, loc10_1, loaded [template = constants.%complete_type.c07]
+// CHECK:STDOUT:   %import_ref.feb = import_ref Main//adapt_specific_type, inst45 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -319,6 +328,9 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Adapter [from "adapt_specific_type.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.709
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.feb
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @C(constants.%T: type) [from "adapt_specific_type.carbon"] {
@@ -334,6 +346,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.b5f
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
+// CHECK:STDOUT:     .x = imports.%import_ref.262
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -456,6 +472,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @C.%C.elem (%C.elem.66c) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.x.2ac [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.433)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .x = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -467,6 +487,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:   adapt_decl %C [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.ed6 [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Adapter
+// CHECK:STDOUT:   extend %C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Access(%a.param_patt: %Adapter) -> %i32 {
@@ -564,6 +588,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @C.%C.elem (%C.elem.66c) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc9_1.1: <witness> = complete_type_witness %struct_type.x.2ac [symbolic = %complete_type.loc9_1.2 (constants.%complete_type.433)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc9_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .x = %.loc8_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -575,6 +603,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:   adapt_decl %C [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.ed6 [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Adapter
+// CHECK:STDOUT:   extend %C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @C(constants.%T) {
@@ -629,8 +661,11 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.b5f: <witness> = import_ref Main//extend_adapt_specific_type_library, loc9_1, loaded [symbolic = @C.%complete_type (constants.%complete_type.433)]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref Main//extend_adapt_specific_type_library, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.262: @C.%C.elem (%C.elem.66c) = import_ref Main//extend_adapt_specific_type_library, loc8_8, loaded [template = %.22b]
 // CHECK:STDOUT:   %import_ref.709: <witness> = import_ref Main//extend_adapt_specific_type_library, loc13_1, loaded [template = constants.%complete_type.c07]
+// CHECK:STDOUT:   %import_ref.feb = import_ref Main//extend_adapt_specific_type_library, inst45 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.19d12e.2: type = import_ref Main//extend_adapt_specific_type_library, loc12_21, loaded [template = constants.%C.239]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -660,6 +695,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Adapter [from "extend_adapt_specific_type_library.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.709
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.feb
+// CHECK:STDOUT:   extend imports.%import_ref.19d12e.2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @C(constants.%T: type) [from "extend_adapt_specific_type_library.carbon"] {
@@ -675,6 +714,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.b5f
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
+// CHECK:STDOUT:     .x = imports.%import_ref.262
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -713,6 +756,7 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %Adapter.type: type = generic_class_type @Adapter [template]
 // CHECK:STDOUT:   %Adapter.generic: %Adapter.type = struct_value () [template]
+// CHECK:STDOUT:   %Adapter.0e3: type = class_type @Adapter, @Adapter(%T) [symbolic]
 // CHECK:STDOUT:   %require_complete.4ae: <witness> = require_complete_type %T [symbolic]
 // CHECK:STDOUT:   %complete_type.f87: <witness> = complete_type_witness %T [symbolic]
 // CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [template]
@@ -781,6 +825,9 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     adapt_decl %T.ref [template]
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %T [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.f87)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Adapter.0e3
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -844,6 +891,7 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.fb3: <witness> = import_ref Main//adapt_generic_type, loc6_1, loaded [symbolic = @Adapter.%complete_type (constants.%complete_type.f87)]
+// CHECK:STDOUT:   %import_ref.9a3 = import_ref Main//adapt_generic_type, inst27 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -907,6 +955,9 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.fb3
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.9a3
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -918,6 +969,10 @@ fn ImportedConvertLocal(a: Adapter(C)) -> i32 {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .n = %.loc11_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ImportedConvert(%a.param_patt: %Adapter.e4c) -> %i32 {
diff --git a/toolchain/check/testdata/class/generic/base_is_generic.carbon b/toolchain/check/testdata/class/generic/base_is_generic.carbon
index 4b1a2aefc851..8123fef8b81a 100644
--- a/toolchain/check/testdata/class/generic/base_is_generic.carbon
+++ b/toolchain/check/testdata/class/generic/base_is_generic.carbon
@@ -176,6 +176,10 @@ fn H() {
 // CHECK:STDOUT:     %.var: ref @Base.%Base.elem (%Base.elem.9af) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.x.2ac [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.433)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Base.370
+// CHECK:STDOUT:     .x = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -187,6 +191,10 @@ fn H() {
 // CHECK:STDOUT:   %.var: ref %Param.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.y [template = constants.%complete_type.0f9]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Param
+// CHECK:STDOUT:   .y = %.loc9_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -196,6 +204,11 @@ fn H() {
 // CHECK:STDOUT:   %.loc13: %Derived.elem = base_decl %Base, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.8bc [template = constants.%complete_type.b07]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   extend %Base
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @DoubleFieldAccess(%d.param_patt: %Derived) -> %i32 {
@@ -268,10 +281,15 @@ fn H() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.e8d: <witness> = import_ref Main//extend_generic_base, loc10_1, loaded [template = constants.%complete_type.09d]
+// CHECK:STDOUT:   %import_ref.446 = import_ref Main//extend_generic_base, inst45 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.a92: %Param.elem = import_ref Main//extend_generic_base, loc9_8, loaded [template = %.be7]
 // CHECK:STDOUT:   %import_ref.b5f: <witness> = import_ref Main//extend_generic_base, loc6_1, loaded [symbolic = @Base.%complete_type (constants.%complete_type.433)]
+// CHECK:STDOUT:   %import_ref.8e0 = import_ref Main//extend_generic_base, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.7f7: @Base.%Base.elem (%Base.elem.9af) = import_ref Main//extend_generic_base, loc5_8, loaded [template = %.e66]
 // CHECK:STDOUT:   %import_ref.bd0: <witness> = import_ref Main//extend_generic_base, loc14_1, loaded [template = constants.%complete_type.b07]
+// CHECK:STDOUT:   %import_ref.f6c = import_ref Main//extend_generic_base, inst82 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.d24 = import_ref Main//extend_generic_base, loc13_27, unloaded
+// CHECK:STDOUT:   %import_ref.77a301.2: type = import_ref Main//extend_generic_base, loc13_26, loaded [template = constants.%Base.7a8]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -303,10 +321,19 @@ fn H() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived [from "extend_generic_base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.bd0
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.f6c
+// CHECK:STDOUT:   .base = imports.%import_ref.d24
+// CHECK:STDOUT:   extend imports.%import_ref.77a301.2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Param [from "extend_generic_base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.e8d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.446
+// CHECK:STDOUT:   .y = imports.%import_ref.a92
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Base(constants.%T: type) [from "extend_generic_base.carbon"] {
@@ -322,6 +349,10 @@ fn H() {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.b5f
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.8e0
+// CHECK:STDOUT:     .x = imports.%import_ref.7f7
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -364,6 +395,7 @@ fn H() {
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.f2e: type = class_type @C, @C(%T) [symbolic]
 // CHECK:STDOUT:   %require_complete: <witness> = require_complete_type %T [symbolic]
 // CHECK:STDOUT:   %X: type = class_type @X [template]
 // CHECK:STDOUT:   %G.type: type = fn_type @G [template]
@@ -413,6 +445,11 @@ fn H() {
 // CHECK:STDOUT:     %.loc9: <error> = base_decl <error>, element0 [template]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .base = %.loc9
+// CHECK:STDOUT:     has_error
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -420,6 +457,10 @@ fn H() {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G() {
@@ -456,6 +497,7 @@ fn H() {
 // CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 0 [symbolic]
 // CHECK:STDOUT:   %X.type: type = generic_class_type @X [template]
 // CHECK:STDOUT:   %X.generic: %X.type = struct_value () [template]
+// CHECK:STDOUT:   %X.75b6d8.1: type = class_type @X, @X(%U) [symbolic]
 // CHECK:STDOUT:   %G.type.56f312.1: type = fn_type @G, @X(%U) [symbolic]
 // CHECK:STDOUT:   %G.b504c4.1: %G.type.56f312.1 = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
@@ -542,6 +584,10 @@ fn H() {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%X.75b6d8.1
+// CHECK:STDOUT:     .G = %G.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -564,6 +610,11 @@ fn H() {
 // CHECK:STDOUT:     %.loc9: @C.%C.elem (%C.elem.3f4) = base_decl %X.loc9_19.1, element0 [template]
 // CHECK:STDOUT:     %complete_type.loc10_1.1: <witness> = complete_type_witness %struct_type.base.f5f [symbolic = %complete_type.loc10_1.2 (constants.%complete_type.768)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc10_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .base = %.loc9
+// CHECK:STDOUT:     extend %X.loc9_19.1
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -735,8 +786,12 @@ fn H() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//extend_generic_symbolic_base, loc6_1, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.e8e = import_ref Main//extend_generic_symbolic_base, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.b8a: @X.%G.type (%G.type.56f312.1) = import_ref Main//extend_generic_symbolic_base, loc5_15, loaded [symbolic = @X.%G (constants.%G.b504c4.1)]
 // CHECK:STDOUT:   %import_ref.93f: <witness> = import_ref Main//extend_generic_symbolic_base, loc10_1, loaded [symbolic = @C.%complete_type (constants.%complete_type.768)]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref Main//extend_generic_symbolic_base, inst68 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.65d = import_ref Main//extend_generic_symbolic_base, loc9_20, unloaded
+// CHECK:STDOUT:   %import_ref.561eb2.2: type = import_ref Main//extend_generic_symbolic_base, loc9_19, loaded [symbolic = @C.%X (constants.%X.75b6d8.2)]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -766,6 +821,11 @@ fn H() {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.93f
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
+// CHECK:STDOUT:     .base = imports.%import_ref.65d
+// CHECK:STDOUT:     extend imports.%import_ref.561eb2.2
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -779,6 +839,10 @@ fn H() {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.e8e
+// CHECK:STDOUT:     .G = imports.%import_ref.b8a
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/basic.carbon b/toolchain/check/testdata/class/generic/basic.carbon
index cf67e1cae6d3..61c2cce1ed09 100644
--- a/toolchain/check/testdata/class/generic/basic.carbon
+++ b/toolchain/check/testdata/class/generic/basic.carbon
@@ -136,6 +136,12 @@ class Declaration(T:! type);
 // CHECK:STDOUT:     %.var: ref @Class.%Class.elem (%Class.elem) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc22_1.1: <witness> = complete_type_witness %struct_type.k [symbolic = %complete_type.loc22_1.2 (constants.%complete_type)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc22_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .GetAddr = %GetAddr.decl
+// CHECK:STDOUT:     .GetValue = %GetValue.decl
+// CHECK:STDOUT:     .k = %.loc21_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/call.carbon b/toolchain/check/testdata/class/generic/call.carbon
index bf66ce2e4fc9..3eed31485ebf 100644
--- a/toolchain/check/testdata/class/generic/call.carbon
+++ b/toolchain/check/testdata/class/generic/call.carbon
@@ -98,6 +98,7 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   %N.patt.8cf: %i32 = symbolic_binding_pattern N, 1 [symbolic]
 // CHECK:STDOUT:   %Class.type: type = generic_class_type @Class [template]
 // CHECK:STDOUT:   %Class.generic: %Class.type = struct_value () [template]
+// CHECK:STDOUT:   %Class.ab2: type = class_type @Class, @Class(%T, %N.356) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %ptr.235: type = ptr_type %i32 [template]
@@ -201,6 +202,9 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class.ab2
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -240,6 +244,7 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   %N.patt.8cf: %i32 = symbolic_binding_pattern N, 1 [symbolic]
 // CHECK:STDOUT:   %Class.type: type = generic_class_type @Class [template]
 // CHECK:STDOUT:   %Class.generic: %Class.type = struct_value () [template]
+// CHECK:STDOUT:   %Class: type = class_type @Class, @Class(%T, %N.356) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %ptr: type = ptr_type %i32 [template]
@@ -300,6 +305,9 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -321,6 +329,7 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   %N.patt.8cf: %i32 = symbolic_binding_pattern N, 1 [symbolic]
 // CHECK:STDOUT:   %Class.type: type = generic_class_type @Class [template]
 // CHECK:STDOUT:   %Class.generic: %Class.type = struct_value () [template]
+// CHECK:STDOUT:   %Class: type = class_type @Class, @Class(%T, %N.356) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %ptr: type = ptr_type %i32 [template]
@@ -385,6 +394,9 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -406,6 +418,7 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   %N.patt.8cf: %i32 = symbolic_binding_pattern N, 1 [symbolic]
 // CHECK:STDOUT:   %Class.type: type = generic_class_type @Class [template]
 // CHECK:STDOUT:   %Class.generic: %Class.type = struct_value () [template]
+// CHECK:STDOUT:   %Class: type = class_type @Class, @Class(%T, %N.356) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %int_5: Core.IntLiteral = int_value 5 [template]
@@ -470,6 +483,9 @@ class Outer(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -565,6 +581,10 @@ class Outer(T:! type) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Outer.9d6
+// CHECK:STDOUT:     .Inner = %Inner.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -628,6 +648,13 @@ class Outer(T:! type) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Inner.c71
+// CHECK:STDOUT:     .A = %A.decl
+// CHECK:STDOUT:     .B = %B.decl
+// CHECK:STDOUT:     .C = %C.decl
+// CHECK:STDOUT:     .D = %D.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/complete_in_conversion.carbon b/toolchain/check/testdata/class/generic/complete_in_conversion.carbon
index be5c11260fd8..ad581c12ecfe 100644
--- a/toolchain/check/testdata/class/generic/complete_in_conversion.carbon
+++ b/toolchain/check/testdata/class/generic/complete_in_conversion.carbon
@@ -151,6 +151,9 @@ fn F(a: A(0)*) {
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @A(%N.loc6_9.1: %i32) {
@@ -179,6 +182,12 @@ fn F(a: A(0)*) {
 // CHECK:STDOUT:     %.var: ref @A.%A.elem.loc12 (%A.elem.d60) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc13_1.1: <witness> = complete_type_witness %struct_type.base.n [symbolic = %complete_type.loc13_1.2 (constants.%complete_type.547)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc13_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%A.dd3
+// CHECK:STDOUT:     .base = %.loc7
+// CHECK:STDOUT:     .n = %.loc12_8
+// CHECK:STDOUT:     extend %B.ref
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/field.carbon b/toolchain/check/testdata/class/generic/field.carbon
index 658b7ffbb003..16555a422221 100644
--- a/toolchain/check/testdata/class/generic/field.carbon
+++ b/toolchain/check/testdata/class/generic/field.carbon
@@ -167,6 +167,10 @@ fn H(U:! type, c: Class(U)) -> U {
 // CHECK:STDOUT:     %.var: ref @Class.%Class.elem (%Class.elem.e262de.1) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc13_1.1: <witness> = complete_type_witness %struct_type.x.2ac3f0.1 [symbolic = %complete_type.loc13_1.2 (constants.%complete_type.4339b3.1)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc13_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class.fe1b2d.1
+// CHECK:STDOUT:     .x = %.loc12_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/import.carbon b/toolchain/check/testdata/class/generic/import.carbon
index 5bf368f521de..b16d5fa1db7e 100644
--- a/toolchain/check/testdata/class/generic/import.carbon
+++ b/toolchain/check/testdata/class/generic/import.carbon
@@ -193,6 +193,11 @@ class Class(U:! type) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%CompleteClass.f97
+// CHECK:STDOUT:     .n = %.loc7_8
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -288,6 +293,9 @@ class Class(U:! type) {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.eb1: <witness> = import_ref Main//foo, loc9_1, loaded [template = constants.%complete_type.a68]
+// CHECK:STDOUT:   %import_ref.3c0 = import_ref Main//foo, inst37 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.051 = import_ref Main//foo, loc7_8, unloaded
+// CHECK:STDOUT:   %import_ref.570 = import_ref Main//foo, loc8_17, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -339,6 +347,10 @@ class Class(U:! type) {
 // CHECK:STDOUT:     %.var: ref @Class.%Class.elem (%Class.elem) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.x [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.433)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .x = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -354,6 +366,11 @@ class Class(U:! type) {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.eb1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.3c0
+// CHECK:STDOUT:     .n = imports.%import_ref.051
+// CHECK:STDOUT:     .F = imports.%import_ref.570
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -450,6 +467,7 @@ class Class(U:! type) {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.eb1: <witness> = import_ref Main//foo, loc9_1, loaded [template = constants.%complete_type.54b]
+// CHECK:STDOUT:   %import_ref.3c0 = import_ref Main//foo, inst37 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.e76: @CompleteClass.%CompleteClass.elem (%CompleteClass.elem.28a) = import_ref Main//foo, loc7_8, loaded [template = %.364]
 // CHECK:STDOUT:   %import_ref.a52: @CompleteClass.%F.type (%F.type.14f) = import_ref Main//foo, loc8_17, loaded [symbolic = @CompleteClass.%F (constants.%F.874)]
 // CHECK:STDOUT: }
@@ -497,6 +515,11 @@ class Class(U:! type) {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.eb1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.3c0
+// CHECK:STDOUT:     .n = imports.%import_ref.e76
+// CHECK:STDOUT:     .F = imports.%import_ref.a52
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -632,6 +655,9 @@ class Class(U:! type) {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.eb1: <witness> = import_ref Main//foo, loc9_1, loaded [template = constants.%complete_type.a68]
+// CHECK:STDOUT:   %import_ref.3c0 = import_ref Main//foo, inst37 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.051 = import_ref Main//foo, loc7_8, unloaded
+// CHECK:STDOUT:   %import_ref.570 = import_ref Main//foo, loc8_17, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -659,6 +685,11 @@ class Class(U:! type) {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.eb1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.3c0
+// CHECK:STDOUT:     .n = imports.%import_ref.051
+// CHECK:STDOUT:     .F = imports.%import_ref.570
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -741,6 +772,7 @@ class Class(U:! type) {
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.e41: type = class_type @.1, @.1(%U) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -793,6 +825,10 @@ class Class(U:! type) {
 // CHECK:STDOUT:     %.var: ref <error> = var <invalid>
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness <error> [template = <error>]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.e41
+// CHECK:STDOUT:     .x = %.loc17_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/init.carbon b/toolchain/check/testdata/class/generic/init.carbon
index dba94b05cb9a..19c01d75f542 100644
--- a/toolchain/check/testdata/class/generic/init.carbon
+++ b/toolchain/check/testdata/class/generic/init.carbon
@@ -147,6 +147,10 @@ fn InitFromAdaptedSpecific(x: i32) -> i32 {
 // CHECK:STDOUT:     %.var: ref @Class.%Class.elem (%Class.elem.e26) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.k.b21 [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.b9e)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class.fe1
+// CHECK:STDOUT:     .k = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -345,6 +349,9 @@ fn InitFromAdaptedSpecific(x: i32) -> i32 {
 // CHECK:STDOUT:     adapt_decl %T.ref [template]
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %T [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.f87)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Adapt.2e4
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/member_access.carbon b/toolchain/check/testdata/class/generic/member_access.carbon
index b8b3af71ceb2..15c09b98bd0f 100644
--- a/toolchain/check/testdata/class/generic/member_access.carbon
+++ b/toolchain/check/testdata/class/generic/member_access.carbon
@@ -236,6 +236,12 @@ fn StaticMemberFunctionCall(T:! type) -> Class(T) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type.loc8_1.1: <witness> = complete_type_witness %struct_type.x.2ac [symbolic = %complete_type.loc8_1.2 (constants.%complete_type.433)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc8_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class.fe1
+// CHECK:STDOUT:     .x = %.loc3_8
+// CHECK:STDOUT:     .Get = %Get.decl
+// CHECK:STDOUT:     .GetAddr = %GetAddr.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -473,6 +479,10 @@ fn StaticMemberFunctionCall(T:! type) -> Class(T) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .Make = %Make.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/member_inline.carbon b/toolchain/check/testdata/class/generic/member_inline.carbon
index 197eab27595e..5d3f43da9a24 100644
--- a/toolchain/check/testdata/class/generic/member_inline.carbon
+++ b/toolchain/check/testdata/class/generic/member_inline.carbon
@@ -132,6 +132,12 @@ class C(T:! type) {
 // CHECK:STDOUT:     %.var: ref @Class.%Class.elem (%Class.elem) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc14_1.1: <witness> = complete_type_witness %struct_type.n [symbolic = %complete_type.loc14_1.2 (constants.%complete_type)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc14_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:     .G = %G.decl
+// CHECK:STDOUT:     .n = %.loc13_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -253,6 +259,11 @@ class C(T:! type) {
 // CHECK:STDOUT:     %.var: ref @C.%C.elem (%C.elem) = var <invalid>
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %struct_type.data [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:     .data = %.loc12_11
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/member_lookup.carbon b/toolchain/check/testdata/class/generic/member_lookup.carbon
index 0ec270c57bf7..af47353abd8e 100644
--- a/toolchain/check/testdata/class/generic/member_lookup.carbon
+++ b/toolchain/check/testdata/class/generic/member_lookup.carbon
@@ -226,6 +226,10 @@ fn AccessMissingConcrete(x: Derived(i32)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @Base.%Base.elem (%Base.elem.9af) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.b.f69 [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.eaf)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Base.370
+// CHECK:STDOUT:     .b = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -255,6 +259,12 @@ fn AccessMissingConcrete(x: Derived(i32)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @Derived.%Derived.elem.loc10 (%Derived.elem.6d2) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc11_1.1: <witness> = complete_type_witness %struct_type.base.d.37c [symbolic = %complete_type.loc11_1.2 (constants.%complete_type.8ad)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc11_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Derived.85c
+// CHECK:STDOUT:     .base = %.loc9
+// CHECK:STDOUT:     .d = %.loc10_8
+// CHECK:STDOUT:     extend %Base.loc9_22.1
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -547,6 +557,10 @@ fn AccessMissingConcrete(x: Derived(i32)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @Base.%Base.elem (%Base.elem.9af) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc6_1.1: <witness> = complete_type_witness %struct_type.b.f69 [symbolic = %complete_type.loc6_1.2 (constants.%complete_type.eaf)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc6_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Base.370
+// CHECK:STDOUT:     .b = %.loc5_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -576,6 +590,12 @@ fn AccessMissingConcrete(x: Derived(i32)) -> i32 {
 // CHECK:STDOUT:     %.var: ref @Derived.%Derived.elem.loc10 (%Derived.elem.6d2) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc11_1.1: <witness> = complete_type_witness %struct_type.base.d.37c [symbolic = %complete_type.loc11_1.2 (constants.%complete_type.8ad)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc11_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Derived.85c
+// CHECK:STDOUT:     .base = %.loc9
+// CHECK:STDOUT:     .d = %.loc10_8
+// CHECK:STDOUT:     extend %Base.loc9_22.1
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/member_out_of_line.carbon b/toolchain/check/testdata/class/generic/member_out_of_line.carbon
index 331797634b1b..3e9b381688f6 100644
--- a/toolchain/check/testdata/class/generic/member_out_of_line.carbon
+++ b/toolchain/check/testdata/class/generic/member_out_of_line.carbon
@@ -232,6 +232,12 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:     %.var: ref @Class.%Class.elem (%Class.elem) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc8_1.1: <witness> = complete_type_witness %struct_type.n [symbolic = %complete_type.loc8_1.2 (constants.%complete_type)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc8_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:     .G = %G.decl
+// CHECK:STDOUT:     .n = %.loc7_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -303,6 +309,7 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %A.type: type = generic_class_type @A [template]
 // CHECK:STDOUT:   %A.generic: %A.type = struct_value () [template]
+// CHECK:STDOUT:   %A: type = class_type @A, @A(%T) [symbolic]
 // CHECK:STDOUT:   %N: %T = bind_symbolic_name N, 1 [symbolic]
 // CHECK:STDOUT:   %N.patt: %T = symbolic_binding_pattern N, 1 [symbolic]
 // CHECK:STDOUT:   %B.type: type = generic_class_type @B, @A(%T) [symbolic]
@@ -378,6 +385,10 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%A
+// CHECK:STDOUT:     .B = %B.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -409,6 +420,10 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%B
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -496,6 +511,10 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NotGeneric
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F();
@@ -524,6 +543,7 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %Generic.type: type = generic_class_type @Generic [template]
 // CHECK:STDOUT:   %Generic.generic: %Generic.type = struct_value () [template]
+// CHECK:STDOUT:   %Generic: type = class_type @Generic, @Generic(%T) [symbolic]
 // CHECK:STDOUT:   %TooFew.type: type = fn_type @TooFew, @Generic(%T) [symbolic]
 // CHECK:STDOUT:   %TooFew: %TooFew.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
@@ -567,6 +587,10 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:     %TooFew.decl: @Generic.%TooFew.type (%TooFew.type) = fn_decl @TooFew [symbolic = @Generic.%TooFew (constants.%TooFew)] {} {}
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Generic
+// CHECK:STDOUT:     .TooFew = %TooFew.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -596,6 +620,7 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %Generic.type: type = generic_class_type @Generic [template]
 // CHECK:STDOUT:   %Generic.generic: %Generic.type = struct_value () [template]
+// CHECK:STDOUT:   %Generic: type = class_type @Generic, @Generic(%T) [symbolic]
 // CHECK:STDOUT:   %TooMany.type: type = fn_type @TooMany, @Generic(%T) [symbolic]
 // CHECK:STDOUT:   %TooMany: %TooMany.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
@@ -646,6 +671,10 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:     %TooMany.decl: @Generic.%TooMany.type (%TooMany.type) = fn_decl @TooMany [symbolic = @Generic.%TooMany (constants.%TooMany)] {} {}
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Generic
+// CHECK:STDOUT:     .TooMany = %TooMany.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -692,6 +721,7 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:   %Generic.type: type = generic_class_type @Generic [template]
 // CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [template]
 // CHECK:STDOUT:   %Generic.generic: %Generic.type = struct_value () [template]
+// CHECK:STDOUT:   %Generic: type = class_type @Generic, @Generic(%T.8b3) [symbolic]
 // CHECK:STDOUT:   %WrongType.type: type = fn_type @WrongType, @Generic(%T.8b3) [symbolic]
 // CHECK:STDOUT:   %WrongType: %WrongType.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
@@ -744,6 +774,10 @@ fn Generic(T:! ()).WrongType() {}
 // CHECK:STDOUT:     %WrongType.decl: @Generic.%WrongType.type (%WrongType.type) = fn_decl @WrongType [symbolic = @Generic.%WrongType (constants.%WrongType)] {} {}
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Generic
+// CHECK:STDOUT:     .WrongType = %WrongType.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/method_deduce.carbon b/toolchain/check/testdata/class/generic/method_deduce.carbon
index 404cc98593f7..2657982b205c 100644
--- a/toolchain/check/testdata/class/generic/method_deduce.carbon
+++ b/toolchain/check/testdata/class/generic/method_deduce.carbon
@@ -35,6 +35,7 @@ fn CallGenericMethodWithNonDeducedParam(c: Class(A)) -> (A, B) {
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %Class.type: type = generic_class_type @Class [template]
 // CHECK:STDOUT:   %Class.generic: %Class.type = struct_value () [template]
+// CHECK:STDOUT:   %Class.fe1: type = class_type @Class, @Class(%T) [symbolic]
 // CHECK:STDOUT:   %U: type = bind_symbolic_name U, 1 [symbolic]
 // CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 1 [symbolic]
 // CHECK:STDOUT:   %tuple.type.24b: type = tuple_type (type, type) [template]
@@ -135,11 +136,17 @@ fn CallGenericMethodWithNonDeducedParam(c: Class(A)) -> (A, B) {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Class(%T.loc14_13.1: type) {
@@ -190,6 +197,11 @@ fn CallGenericMethodWithNonDeducedParam(c: Class(A)) -> (A, B) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class.fe1
+// CHECK:STDOUT:     .Get = %Get.decl
+// CHECK:STDOUT:     .GetNoDeduce = %GetNoDeduce.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/redeclare.carbon b/toolchain/check/testdata/class/generic/redeclare.carbon
index e2958dedece1..f283a07b85dd 100644
--- a/toolchain/check/testdata/class/generic/redeclare.carbon
+++ b/toolchain/check/testdata/class/generic/redeclare.carbon
@@ -94,6 +94,7 @@ class E(U:! type) {}
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %Generic.type: type = generic_class_type @Generic [template]
 // CHECK:STDOUT:   %Generic.generic: %Generic.type = struct_value () [template]
+// CHECK:STDOUT:   %Generic: type = class_type @Generic, @Generic(%T) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -136,6 +137,9 @@ class E(U:! type) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Generic
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -152,6 +156,7 @@ class E(U:! type) {}
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.e41: type = class_type @.1, @.1(%T) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -190,6 +195,9 @@ class E(U:! type) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.e41
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -213,6 +221,7 @@ class E(U:! type) {}
 // CHECK:STDOUT:   %N.patt.51c: %T = symbolic_binding_pattern N, 1 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.943: type = class_type @.1, @.1(%T, %N.f22) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -274,6 +283,9 @@ class E(U:! type) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.943
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -302,6 +314,7 @@ class E(U:! type) {}
 // CHECK:STDOUT:   %U.patt: %i32 = symbolic_binding_pattern U, 1 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.c28: type = class_type @.1, @.1(%T, %U) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -362,6 +375,9 @@ class E(U:! type) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.c28
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -390,6 +406,7 @@ class E(U:! type) {}
 // CHECK:STDOUT:   %T.patt.8e2: %i32 = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.f5e: type = class_type @.1, @.1(%T.51e) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -444,6 +461,9 @@ class E(U:! type) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.f5e
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -468,6 +488,7 @@ class E(U:! type) {}
 // CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 0 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.e41: type = class_type @.1, @.1(%U) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -517,6 +538,9 @@ class E(U:! type) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.e41
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/self.carbon b/toolchain/check/testdata/class/generic/self.carbon
index a25da0f6899a..17fefa902e89 100644
--- a/toolchain/check/testdata/class/generic/self.carbon
+++ b/toolchain/check/testdata/class/generic/self.carbon
@@ -98,6 +98,12 @@ class Class(T:! type) {
 // CHECK:STDOUT:     %F.decl: @Class.%F.type (%F.type) = fn_decl @F [symbolic = @Class.%F (constants.%F)] {} {}
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .MakeSelf = %MakeSelf.decl
+// CHECK:STDOUT:     .MakeClass = %MakeClass.decl
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic/stringify.carbon b/toolchain/check/testdata/class/generic/stringify.carbon
index af6be2f423ea..37931f1ea9bb 100644
--- a/toolchain/check/testdata/class/generic/stringify.carbon
+++ b/toolchain/check/testdata/class/generic/stringify.carbon
@@ -140,11 +140,17 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT: class @NoParams {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NoParams
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @EmptyParams {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%EmptyParams
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -162,10 +168,12 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %Outer.type: type = generic_class_type @Outer [template]
 // CHECK:STDOUT:   %Outer.generic: %Outer.type = struct_value () [template]
+// CHECK:STDOUT:   %Outer.9d6: type = class_type @Outer, @Outer(%T) [symbolic]
 // CHECK:STDOUT:   %U: type = bind_symbolic_name U, 1 [symbolic]
 // CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 1 [symbolic]
 // CHECK:STDOUT:   %Inner.type.eae: type = generic_class_type @Inner, @Outer(%T) [symbolic]
 // CHECK:STDOUT:   %Inner.generic.137: %Inner.type.eae = struct_value () [symbolic]
+// CHECK:STDOUT:   %Inner.c71: type = class_type @Inner, @Inner(%T, %U) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %ptr.c28: type = ptr_type %empty_struct_type [template]
@@ -256,6 +264,10 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Outer.9d6
+// CHECK:STDOUT:     .Inner = %Inner.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -268,6 +280,9 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Inner.c71
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -317,6 +332,7 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   %N.patt.8e2: %i32 = symbolic_binding_pattern N, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.506: type = class_type @C, @C(%N.51e) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %int_123.fff: Core.IntLiteral = int_value 123 [template]
@@ -385,6 +401,9 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.506
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -421,6 +440,7 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   %F.patt: %D = symbolic_binding_pattern F, 0 [symbolic]
 // CHECK:STDOUT:   %E.type: type = generic_class_type @E [template]
 // CHECK:STDOUT:   %E.generic: %E.type = struct_value () [template]
+// CHECK:STDOUT:   %E: type = class_type @E, @E(%F) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [template]
@@ -520,6 +540,11 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   %.var.loc6: ref %D.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .a = %.loc5_8
+// CHECK:STDOUT:   .b = %.loc6_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @E(%F.loc9_9.1: %D) {
@@ -531,6 +556,9 @@ var g: E({.a = 1, .b = 2}) = {} as E({.a = 3, .b = 4} as D);
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%E
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/generic_method.carbon b/toolchain/check/testdata/class/generic_method.carbon
index 4eaec09bdc8d..4072131571e6 100644
--- a/toolchain/check/testdata/class/generic_method.carbon
+++ b/toolchain/check/testdata/class/generic_method.carbon
@@ -109,6 +109,11 @@ fn Class(T:! type).F[self: Self](n: T) {}
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type.loc14_1.1: <witness> = complete_type_witness %struct_type.a [symbolic = %complete_type.loc14_1.2 (constants.%complete_type)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc14_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .a = %.loc12_8
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/import.carbon b/toolchain/check/testdata/class/import.carbon
index 52176790d86a..ea961ca257b2 100644
--- a/toolchain/check/testdata/class/import.carbon
+++ b/toolchain/check/testdata/class/import.carbon
@@ -97,6 +97,9 @@ fn Run() {
 // CHECK:STDOUT: class @Empty {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Empty
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Field {
@@ -107,6 +110,10 @@ fn Run() {
 // CHECK:STDOUT:   %.var: ref %Field.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Field
+// CHECK:STDOUT:   .x = %.loc8_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ForwardDeclared {
@@ -132,6 +139,11 @@ fn Run() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%ForwardDeclared
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Incomplete;
@@ -192,12 +204,18 @@ fn Run() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//a, loc5_1, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.fd7 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.709: <witness> = import_ref Main//a, loc9_1, loaded [template = constants.%complete_type.c07]
+// CHECK:STDOUT:   %import_ref.845 = import_ref Main//a, inst21 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.4d2: %Field.elem = import_ref Main//a, loc8_8, loaded [template = %.d33]
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//a, loc16_1, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.39e731.1 = import_ref Main//a, inst59 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.760: %F.type = import_ref Main//a, loc14_21, loaded [template = constants.%F]
 // CHECK:STDOUT:   %import_ref.26e: %G.type = import_ref Main//a, loc15_27, loaded [template = constants.%G]
 // CHECK:STDOUT:   %import_ref.8f24d3.3: <witness> = import_ref Main//a, loc16_1, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.39e731.2 = import_ref Main//a, inst59 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.42a = import_ref Main//a, loc14_21, unloaded
+// CHECK:STDOUT:   %import_ref.67a = import_ref Main//a, loc15_27, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -216,18 +234,35 @@ fn Run() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Empty [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.fd7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Field [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.709
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.845
+// CHECK:STDOUT:   .x = imports.%import_ref.4d2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ForwardDeclared.1 [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.39e731.1
+// CHECK:STDOUT:   .F = imports.%import_ref.760
+// CHECK:STDOUT:   .G = imports.%import_ref.26e
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ForwardDeclared.2 [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.39e731.2
+// CHECK:STDOUT:   .F = imports.%import_ref.42a
+// CHECK:STDOUT:   .G = imports.%import_ref.67a
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Incomplete [from "a.carbon"];
diff --git a/toolchain/check/testdata/class/import_base.carbon b/toolchain/check/testdata/class/import_base.carbon
index 6d7eab576b3f..f819c88b6b00 100644
--- a/toolchain/check/testdata/class/import_base.carbon
+++ b/toolchain/check/testdata/class/import_base.carbon
@@ -103,6 +103,13 @@ fn Run() {
 // CHECK:STDOUT:   %.var.loc9: ref %Base.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.unused [template = constants.%complete_type.20c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .Unused = %Unused.decl
+// CHECK:STDOUT:   .x = %.loc8_8
+// CHECK:STDOUT:   .unused = %.loc9_13
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Child {
@@ -110,6 +117,11 @@ fn Run() {
 // CHECK:STDOUT:   %.loc13: %Child.elem = base_decl %Base.ref, element0 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.15c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Child
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %Base]();
@@ -164,9 +176,15 @@ fn Run() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.239: <witness> = import_ref Main//a, loc10_1, loaded [template = constants.%complete_type.90f]
+// CHECK:STDOUT:   %import_ref.1f3 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.e8f: %F.type = import_ref Main//a, loc5_21, loaded [template = constants.%F]
+// CHECK:STDOUT:   %import_ref.8bf = import_ref Main//a, loc6_26, unloaded
 // CHECK:STDOUT:   %import_ref.e67: %Base.elem = import_ref Main//a, loc8_8, loaded [template = %.720]
+// CHECK:STDOUT:   %import_ref.2e4 = import_ref Main//a, loc9_13, unloaded
 // CHECK:STDOUT:   %import_ref.c5f: <witness> = import_ref Main//a, loc14_1, loaded [template = constants.%complete_type.15c]
+// CHECK:STDOUT:   %import_ref.9a9 = import_ref Main//a, inst76 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.7e5 = import_ref Main//a, loc13_20, unloaded
+// CHECK:STDOUT:   %import_ref.a21640.2: type = import_ref Main//a, loc13_16, loaded [template = constants.%Base]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -183,10 +201,22 @@ fn Run() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Child [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.c5f
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.9a9
+// CHECK:STDOUT:   .base = imports.%import_ref.7e5
+// CHECK:STDOUT:   extend imports.%import_ref.a21640.2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Base [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.239
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.1f3
+// CHECK:STDOUT:   .F = imports.%import_ref.e8f
+// CHECK:STDOUT:   .Unused = imports.%import_ref.8bf
+// CHECK:STDOUT:   .x = imports.%import_ref.e67
+// CHECK:STDOUT:   .unused = imports.%import_ref.2e4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Run() {
diff --git a/toolchain/check/testdata/class/import_forward_decl.carbon b/toolchain/check/testdata/class/import_forward_decl.carbon
index d90ed5e8cfa4..443e16bece5c 100644
--- a/toolchain/check/testdata/class/import_forward_decl.carbon
+++ b/toolchain/check/testdata/class/import_forward_decl.carbon
@@ -74,5 +74,8 @@ class ForwardDecl {
 // CHECK:STDOUT: class @ForwardDecl {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%ForwardDecl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/import_indirect.carbon b/toolchain/check/testdata/class/import_indirect.carbon
index a9451ce6a177..a979dd90b492 100644
--- a/toolchain/check/testdata/class/import_indirect.carbon
+++ b/toolchain/check/testdata/class/import_indirect.carbon
@@ -127,6 +127,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- b.carbon
@@ -146,6 +149,7 @@ var ptr: E* = &val;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -181,6 +185,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -212,6 +219,7 @@ var ptr: E* = &val;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -247,6 +255,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -281,6 +292,7 @@ var ptr: E* = &val;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -316,6 +328,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -350,6 +365,7 @@ var ptr: E* = &val;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -385,6 +401,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -421,6 +440,7 @@ var ptr: E* = &val;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//b, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//b, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -458,6 +478,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -494,6 +517,7 @@ var ptr: E* = &val;
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//b, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//b, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -531,6 +555,9 @@ var ptr: E* = &val;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/class/import_member_cycle.carbon b/toolchain/check/testdata/class/import_member_cycle.carbon
index e0d98a90134e..8218dc035797 100644
--- a/toolchain/check/testdata/class/import_member_cycle.carbon
+++ b/toolchain/check/testdata/class/import_member_cycle.carbon
@@ -60,6 +60,10 @@ fn Run() {
 // CHECK:STDOUT:   %.var: ref %Cycle.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Cycle
+// CHECK:STDOUT:   .a = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- b.carbon
@@ -80,6 +84,8 @@ fn Run() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.72d: <witness> = import_ref Main//a, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.3a6 = import_ref Main//a, inst16 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.4e0 = import_ref Main//a, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -95,6 +101,10 @@ fn Run() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Cycle [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.72d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.3a6
+// CHECK:STDOUT:   .a = imports.%import_ref.4e0
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Run() {
diff --git a/toolchain/check/testdata/class/import_struct_cyle.carbon b/toolchain/check/testdata/class/import_struct_cyle.carbon
index 69f78f0e2a4c..1d7b36078dfe 100644
--- a/toolchain/check/testdata/class/import_struct_cyle.carbon
+++ b/toolchain/check/testdata/class/import_struct_cyle.carbon
@@ -79,6 +79,10 @@ fn Run() {
 // CHECK:STDOUT:   %.var: ref %Cycle.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.c [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Cycle
+// CHECK:STDOUT:   .c = %.loc10_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- b.carbon
@@ -102,6 +106,7 @@ fn Run() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.b93: <witness> = import_ref Main//a, loc11_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.3a6 = import_ref Main//a, inst16 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.455: %Cycle.elem = import_ref Main//a, loc10_8, loaded [template = %.354]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -119,6 +124,10 @@ fn Run() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Cycle [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.b93
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.3a6
+// CHECK:STDOUT:   .c = imports.%import_ref.455
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Run() {
diff --git a/toolchain/check/testdata/class/inheritance_access.carbon b/toolchain/check/testdata/class/inheritance_access.carbon
index 53eee50f2a87..99a75d01a29e 100644
--- a/toolchain/check/testdata/class/inheritance_access.carbon
+++ b/toolchain/check/testdata/class/inheritance_access.carbon
@@ -278,6 +278,11 @@ class B {
 // CHECK:STDOUT:   %.var.loc6: ref %Shape.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.y [template = constants.%complete_type.70a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Shape
+// CHECK:STDOUT:   .x [protected] = %.loc5_18
+// CHECK:STDOUT:   .y [protected] = %.loc6_18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Circle {
@@ -303,6 +308,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ed [template = constants.%complete_type.a2b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Circle
+// CHECK:STDOUT:   .base = %.loc10
+// CHECK:STDOUT:   .GetPosition = %GetPosition.decl
+// CHECK:STDOUT:   extend %Shape.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @GetPosition[%self.param_patt: %Circle]() -> %return.param_patt: %tuple.type.d07 {
@@ -380,6 +391,10 @@ class B {
 // CHECK:STDOUT:   %F.decl: %F.type.649 = fn_decl @F.1 [template = constants.%F.485] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -396,6 +411,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.953 [template = constants.%complete_type.020]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .F [private] = %F.decl
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -417,6 +438,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc14
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1();
@@ -510,6 +537,11 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .SOME_CONSTANT [protected] = %SOME_CONSTANT
+// CHECK:STDOUT:   .SomeProtectedFunction [protected] = %SomeProtectedFunction.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -535,6 +567,13 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.020]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc12
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .H = %H.decl
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @SomeProtectedFunction() -> %i32 {
@@ -610,6 +649,10 @@ class B {
 // CHECK:STDOUT:   %.var: ref %Shape.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.y [template = constants.%complete_type.0f9]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Shape
+// CHECK:STDOUT:   .y [private] = %.loc5_16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Square {
@@ -631,6 +674,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ed [template = constants.%complete_type.a2b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Square
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .GetPosition = %GetPosition.decl
+// CHECK:STDOUT:   extend %Shape.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @GetPosition[%self.param_patt: %Square]() -> %i32 {
@@ -674,6 +723,11 @@ class B {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F [private] = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -723,6 +777,11 @@ class B {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F [protected] = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -776,6 +835,10 @@ class B {
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .F [private] = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -784,6 +847,12 @@ class B {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -837,6 +906,10 @@ class B {
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .F [protected] = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -845,6 +918,12 @@ class B {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   extend %B.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -942,6 +1021,11 @@ class B {
 // CHECK:STDOUT:   %SOME_PRIVATE_CONSTANT: %i32 = bind_name SOME_PRIVATE_CONSTANT, %.loc6_44.2
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .SOME_PROTECTED_CONSTANT [protected] = %SOME_PROTECTED_CONSTANT
+// CHECK:STDOUT:   .SOME_PRIVATE_CONSTANT [private] = %SOME_PRIVATE_CONSTANT
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Internal {
@@ -962,6 +1046,10 @@ class B {
 // CHECK:STDOUT:   %INTERNAL_CONSTANT: %i32 = bind_name INTERNAL_CONSTANT, %.loc10_42.2
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Internal
+// CHECK:STDOUT:   .INTERNAL_CONSTANT [protected] = %INTERNAL_CONSTANT
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -995,6 +1083,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.internal.6f5 [template = constants.%complete_type.d77]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .internal [private] = %.loc14_23
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .SomeFunc = %SomeFunc.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G() -> %i32 {
@@ -1060,6 +1154,10 @@ class B {
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x [private] = %.loc5_16
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -1075,6 +1173,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.953 [template = constants.%complete_type.020]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %B]() {
@@ -1129,6 +1233,10 @@ class B {
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .x [protected] = %.loc5_18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -1144,6 +1252,12 @@ class B {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.953 [template = constants.%complete_type.020]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %A.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %B]() {
diff --git a/toolchain/check/testdata/class/init.carbon b/toolchain/check/testdata/class/init.carbon
index e324a2da78c3..03d0e18e7636 100644
--- a/toolchain/check/testdata/class/init.carbon
+++ b/toolchain/check/testdata/class/init.carbon
@@ -119,6 +119,11 @@ fn MakeReorder(n: i32, next: Class*) -> Class {
 // CHECK:STDOUT:   %.var.loc13: ref %Class.elem.0c0 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n.next [template = constants.%complete_type.78f]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .n = %.loc12_8
+// CHECK:STDOUT:   .next = %.loc13_11
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Make(%n.param_patt: %i32, %next.param_patt: %ptr.e71) -> %return.param_patt: %Class {
diff --git a/toolchain/check/testdata/class/init_as.carbon b/toolchain/check/testdata/class/init_as.carbon
index 32aa269fd9d1..e55deb488845 100644
--- a/toolchain/check/testdata/class/init_as.carbon
+++ b/toolchain/check/testdata/class/init_as.carbon
@@ -85,6 +85,11 @@ fn F() -> i32 {
 // CHECK:STDOUT:   %.var.loc13: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32 {
diff --git a/toolchain/check/testdata/class/init_nested.carbon b/toolchain/check/testdata/class/init_nested.carbon
index 106751b65afd..7cdf2058de53 100644
--- a/toolchain/check/testdata/class/init_nested.carbon
+++ b/toolchain/check/testdata/class/init_nested.carbon
@@ -93,6 +93,11 @@ fn MakeOuter() -> Outer {
 // CHECK:STDOUT:   %.var.loc13: ref %Inner.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Inner
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Outer {
@@ -108,6 +113,11 @@ fn MakeOuter() -> Outer {
 // CHECK:STDOUT:   %.var.loc20: ref %Outer.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.c.d.dce [template = constants.%complete_type.8b6]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Outer
+// CHECK:STDOUT:   .c = %.loc19_8
+// CHECK:STDOUT:   .d = %.loc20_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @MakeInner() -> %Inner;
diff --git a/toolchain/check/testdata/class/local.carbon b/toolchain/check/testdata/class/local.carbon
index 9a7ad50f033f..03606446b89c 100644
--- a/toolchain/check/testdata/class/local.carbon
+++ b/toolchain/check/testdata/class/local.carbon
@@ -81,6 +81,10 @@ class A {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -99,6 +103,11 @@ class A {
 // CHECK:STDOUT:   %.var: ref %B.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n.033 [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .Make = %Make.decl
+// CHECK:STDOUT:   .n = %.loc19_12
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32 {
diff --git a/toolchain/check/testdata/class/method.carbon b/toolchain/check/testdata/class/method.carbon
index 800af4b54050..b68cfa2a829b 100644
--- a/toolchain/check/testdata/class/method.carbon
+++ b/toolchain/check/testdata/class/method.carbon
@@ -291,6 +291,13 @@ fn CallGOnInitializingExpr() -> i32 {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.k.0bf [template = constants.%complete_type.954]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .A = %A
+// CHECK:STDOUT:   .k = %.loc17_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %Class]() -> %i32 {
diff --git a/toolchain/check/testdata/class/nested.carbon b/toolchain/check/testdata/class/nested.carbon
index 0afcaa7d0afb..431a5bf57d51 100644
--- a/toolchain/check/testdata/class/nested.carbon
+++ b/toolchain/check/testdata/class/nested.carbon
@@ -123,6 +123,15 @@ fn F(a: Outer*) {
 // CHECK:STDOUT:   %.var.loc38: ref %Outer.elem.fe9 = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.po.qo.pi [template = constants.%complete_type.e99]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Outer
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .Inner = %Inner.decl
+// CHECK:STDOUT:   .H = %H.decl
+// CHECK:STDOUT:   .po = %.loc36_9
+// CHECK:STDOUT:   .qo = %.loc37_9
+// CHECK:STDOUT:   .pi = %.loc38_9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Inner {
@@ -144,6 +153,13 @@ fn F(a: Outer*) {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [template = constants.%G] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.pi.po.qi [template = constants.%complete_type.7ae]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Inner
+// CHECK:STDOUT:   .pi = %.loc19_11
+// CHECK:STDOUT:   .po = %.loc20_11
+// CHECK:STDOUT:   .qi = %.loc21_11
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1() {
diff --git a/toolchain/check/testdata/class/nested_name.carbon b/toolchain/check/testdata/class/nested_name.carbon
index 8f4a28bcd6c0..96670c3a60c9 100644
--- a/toolchain/check/testdata/class/nested_name.carbon
+++ b/toolchain/check/testdata/class/nested_name.carbon
@@ -88,6 +88,10 @@ fn G(o: Outer) {
 // CHECK:STDOUT:   %Inner.decl: type = class_decl @Inner [template = constants.%Inner] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Outer
+// CHECK:STDOUT:   .Inner = %Inner.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Inner {
@@ -98,6 +102,10 @@ fn G(o: Outer) {
 // CHECK:STDOUT:   %.var: ref %Inner.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Inner
+// CHECK:STDOUT:   .n = %.loc13_10
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%oi.param_patt: %Inner) -> %i32 {
diff --git a/toolchain/check/testdata/class/no_prelude/export_name.carbon b/toolchain/check/testdata/class/no_prelude/export_name.carbon
index 24bf60d024c5..ced9ac5912ec 100644
--- a/toolchain/check/testdata/class/no_prelude/export_name.carbon
+++ b/toolchain/check/testdata/class/no_prelude/export_name.carbon
@@ -56,6 +56,9 @@ var c: C = {};
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export.carbon
@@ -69,6 +72,7 @@ var c: C = {};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//base, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -81,6 +85,9 @@ var c: C = {};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- use_export.carbon
@@ -95,6 +102,7 @@ var c: C = {};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//export, inst19 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export, inst20 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -114,6 +122,9 @@ var c: C = {};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/class/no_prelude/extern.carbon b/toolchain/check/testdata/class/no_prelude/extern.carbon
index ebdb64529443..e21ffe685178 100644
--- a/toolchain/check/testdata/class/no_prelude/extern.carbon
+++ b/toolchain/check/testdata/class/no_prelude/extern.carbon
@@ -345,6 +345,9 @@ extern class C;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_decl_fn_in_extern.carbon
@@ -385,6 +388,9 @@ extern class C;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_extern_decl_after_extern_decl.carbon
@@ -439,6 +445,10 @@ extern class C;
 // CHECK:STDOUT:   %D.decl: type = class_decl @D [template = constants.%D] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .D = %D.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D;
@@ -462,6 +472,9 @@ extern class C;
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_extern_decl_after_decl.carbon
@@ -593,6 +606,7 @@ extern class C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//def, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -605,6 +619,9 @@ extern class C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_extern_decl_after_import_def.carbon
@@ -617,6 +634,7 @@ extern class C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//def, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -629,5 +647,8 @@ extern class C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/no_prelude/generic_vs_params.carbon b/toolchain/check/testdata/class/no_prelude/generic_vs_params.carbon
index efc04c4c8c32..bddc31fe878a 100644
--- a/toolchain/check/testdata/class/no_prelude/generic_vs_params.carbon
+++ b/toolchain/check/testdata/class/no_prelude/generic_vs_params.carbon
@@ -67,13 +67,17 @@ fn F(T:! type) {
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %GenericAndParams.type.c8d: type = generic_class_type @GenericAndParams.1 [template]
 // CHECK:STDOUT:   %GenericAndParams.generic.1e4: %GenericAndParams.type.c8d = struct_value () [template]
+// CHECK:STDOUT:   %GenericAndParams.2ce: type = class_type @GenericAndParams.1, @GenericAndParams.1(%T) [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.f2e: type = class_type @C, @C(%T) [symbolic]
 // CHECK:STDOUT:   %GenericNoParams.72f: type = class_type @GenericNoParams [template]
+// CHECK:STDOUT:   %GenericNoParams.fbf: type = class_type @GenericNoParams, @GenericNoParams(%T) [symbolic]
 // CHECK:STDOUT:   %U: type = bind_symbolic_name U, 1 [symbolic]
 // CHECK:STDOUT:   %U.patt: type = symbolic_binding_pattern U, 1 [symbolic]
 // CHECK:STDOUT:   %GenericAndParams.type.3ce: type = generic_class_type @GenericAndParams.2, @C(%T) [symbolic]
 // CHECK:STDOUT:   %GenericAndParams.generic.54a: %GenericAndParams.type.3ce = struct_value () [symbolic]
+// CHECK:STDOUT:   %GenericAndParams.425: type = class_type @GenericAndParams.2, @GenericAndParams.2(%T, %U) [symbolic]
 // CHECK:STDOUT:   %X: type = class_type @X [template]
 // CHECK:STDOUT:   %NotGenericNoParams.val: %NotGenericNoParams = struct_value () [template]
 // CHECK:STDOUT:   %NotGenericButParams.val: %NotGenericButParams = struct_value () [template]
@@ -177,11 +181,17 @@ fn F(T:! type) {
 // CHECK:STDOUT: class @NotGenericNoParams {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NotGenericNoParams
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NotGenericButParams {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NotGenericButParams
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @GenericAndParams.1(%T.loc6_24.1: type) {
@@ -193,6 +203,9 @@ fn F(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%GenericAndParams.2ce
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -215,6 +228,11 @@ fn F(T:! type) {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .GenericNoParams = %GenericNoParams.decl
+// CHECK:STDOUT:     .GenericAndParams = %GenericAndParams.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -224,6 +242,9 @@ fn F(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%GenericNoParams.fbf
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -236,12 +257,18 @@ fn F(T:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%GenericAndParams.425
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -316,6 +343,7 @@ fn F(T:! type) {
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %A.type: type = generic_class_type @A [template]
 // CHECK:STDOUT:   %A.generic: %A.type = struct_value () [template]
+// CHECK:STDOUT:   %A: type = class_type @A [template]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -330,6 +358,9 @@ fn F(T:! type) {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_non_generic_params.carbon
@@ -364,6 +395,9 @@ fn F(T:! type) {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc11_6.1: type) {
diff --git a/toolchain/check/testdata/class/no_prelude/implicit_import.carbon b/toolchain/check/testdata/class/no_prelude/implicit_import.carbon
index 7fe0a52fd775..24211decf9eb 100644
--- a/toolchain/check/testdata/class/no_prelude/implicit_import.carbon
+++ b/toolchain/check/testdata/class/no_prelude/implicit_import.carbon
@@ -119,6 +119,9 @@ class B {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- redecl_after_def.carbon
@@ -139,6 +142,9 @@ class B {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_redecl_after_def.impl.carbon
@@ -151,6 +157,7 @@ class B {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//redecl_after_def, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//redecl_after_def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -164,6 +171,9 @@ class B {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- redef_after_def.carbon
@@ -184,6 +194,9 @@ class B {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_redef_after_def.impl.carbon
@@ -198,6 +211,7 @@ class B {}
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//redef_after_def, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//redef_after_def, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//redef_after_def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -211,11 +225,17 @@ class B {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "redef_after_def.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.a95
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- def_alias.carbon
@@ -265,5 +285,8 @@ class B {}
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.a95
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/no_prelude/import_access.carbon b/toolchain/check/testdata/class/no_prelude/import_access.carbon
index 490fc6fe46d1..e7d61f875396 100644
--- a/toolchain/check/testdata/class/no_prelude/import_access.carbon
+++ b/toolchain/check/testdata/class/no_prelude/import_access.carbon
@@ -154,6 +154,9 @@ private class Redecl {}
 // CHECK:STDOUT: class @Def {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Def
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- forward_with_def.carbon
@@ -175,6 +178,9 @@ private class Redecl {}
 // CHECK:STDOUT: class @ForwardWithDef {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%ForwardWithDef
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- forward.carbon
@@ -204,6 +210,7 @@ private class Redecl {}
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.c21: type = import_ref Test//def, Def, loaded [template = constants.%Def]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Test//def, loc4_20, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.4ce = import_ref Test//def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -224,6 +231,9 @@ private class Redecl {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Def [from "def.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.4ce
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -311,6 +321,7 @@ private class Redecl {}
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.142: type = import_ref Test//forward_with_def, ForwardWithDef, loaded [template = constants.%ForwardWithDef]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Test//forward_with_def, loc6_23, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.414 = import_ref Test//forward_with_def, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -331,6 +342,9 @@ private class Redecl {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ForwardWithDef [from "forward_with_def.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.414
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -445,6 +459,9 @@ private class Redecl {}
 // CHECK:STDOUT: class @Forward {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Forward
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%c.param_patt: %ptr) {
@@ -539,5 +556,8 @@ private class Redecl {}
 // CHECK:STDOUT: class @Redecl {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Redecl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/no_prelude/indirect_import_member.carbon b/toolchain/check/testdata/class/no_prelude/indirect_import_member.carbon
index 321322a9e8de..b32bbbafbfeb 100644
--- a/toolchain/check/testdata/class/no_prelude/indirect_import_member.carbon
+++ b/toolchain/check/testdata/class/no_prelude/indirect_import_member.carbon
@@ -121,6 +121,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [template = constants.%F] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -152,6 +156,8 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//a, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.2cf = import_ref Main//a, loc5_10, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -164,6 +170,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .F = imports.%import_ref.2cf
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- d.carbon
@@ -191,6 +201,8 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//c, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//c, inst19 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//c, inst20 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.230 = import_ref Main//c, inst21 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -208,10 +220,18 @@ var x: () = D.C.F();
 // CHECK:STDOUT:   %C: type = bind_alias C, imports.%import_ref.06e [template = constants.%C]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .C = %C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "c.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .F = imports.%import_ref.230
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- f.carbon
@@ -241,6 +261,7 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//a, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//a, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//a, inst14 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.943: %F.type = import_ref Main//a, loc5_10, loaded [template = constants.%F]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -264,6 +285,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .F = imports.%import_ref.943
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() [from "a.carbon"];
@@ -291,6 +316,7 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//c, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//c, inst19 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//c, inst20 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.5d3: %F.type = import_ref Main//c, inst21 [indirect], loaded [template = constants.%F]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -314,6 +340,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "c.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .F = imports.%import_ref.5d3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() [from "a.carbon"];
@@ -341,6 +371,7 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//c, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//c, inst19 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//c, inst20 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.5d3: %F.type = import_ref Main//c, inst21 [indirect], loaded [template = constants.%F]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -364,6 +395,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "c.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .F = imports.%import_ref.5d3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() [from "a.carbon"];
@@ -392,8 +427,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.b0a: type = import_ref Main//e, D, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//e, loc8_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref Main//e, inst16 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.bf1: type = import_ref Main//e, loc7_9, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f3: <witness> = import_ref Main//e, inst22 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.db8 = import_ref Main//e, inst23 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.c85: %F.type = import_ref Main//e, inst24 [indirect], loaded [template = constants.%F]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -417,10 +454,18 @@ var x: () = D.C.F();
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "e.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
+// CHECK:STDOUT:   .C = imports.%import_ref.bf1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "e.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.db8
+// CHECK:STDOUT:   .F = imports.%import_ref.c85
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() [from "a.carbon"];
@@ -450,8 +495,10 @@ var x: () = D.C.F();
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.b0a: type = import_ref Main//e, D, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//e, loc8_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref Main//e, inst16 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.bf1: type = import_ref Main//e, loc7_9, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f3: <witness> = import_ref Main//e, inst22 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.db8 = import_ref Main//e, inst23 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.c85: %F.type = import_ref Main//e, inst24 [indirect], loaded [template = constants.%F]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -475,10 +522,18 @@ var x: () = D.C.F();
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "e.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
+// CHECK:STDOUT:   .C = imports.%import_ref.bf1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "e.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.db8
+// CHECK:STDOUT:   .F = imports.%import_ref.c85
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() [from "a.carbon"];
diff --git a/toolchain/check/testdata/class/no_prelude/no_definition_in_impl_file.carbon b/toolchain/check/testdata/class/no_prelude/no_definition_in_impl_file.carbon
index eae7928e8f08..159883668d55 100644
--- a/toolchain/check/testdata/class/no_prelude/no_definition_in_impl_file.carbon
+++ b/toolchain/check/testdata/class/no_prelude/no_definition_in_impl_file.carbon
@@ -111,6 +111,9 @@ class D;
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- use_decl_in_api.carbon
diff --git a/toolchain/check/testdata/class/no_prelude/syntactic_merge.carbon b/toolchain/check/testdata/class/no_prelude/syntactic_merge.carbon
index f36708933da5..689bd4d049d3 100644
--- a/toolchain/check/testdata/class/no_prelude/syntactic_merge.carbon
+++ b/toolchain/check/testdata/class/no_prelude/syntactic_merge.carbon
@@ -190,8 +190,10 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %a.patt: %C = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %Foo.type: type = generic_class_type @Foo [template]
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
+// CHECK:STDOUT:   %Foo: type = class_type @Foo, @Foo(%a) [symbolic]
 // CHECK:STDOUT:   %Bar.type: type = generic_class_type @Bar [template]
 // CHECK:STDOUT:   %Bar.generic: %Bar.type = struct_value () [template]
+// CHECK:STDOUT:   %Bar: type = class_type @Bar, @Bar(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -241,6 +243,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc7_11.1: %C) {
@@ -252,6 +257,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Foo
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -264,6 +272,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Bar
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -287,6 +298,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %a.patt: %C = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %Foo.type: type = generic_class_type @Foo [template]
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
+// CHECK:STDOUT:   %Foo: type = class_type @Foo, @Foo(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -316,6 +328,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc6_17.1: %C) {
@@ -327,6 +342,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Foo
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -347,6 +365,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.cb8: type = class_type @.1, @.1(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -376,6 +395,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc6_11.1: %C) {
@@ -394,6 +416,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.cb8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -417,6 +442,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %a.patt: %C = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %Foo.type: type = generic_class_type @Foo [template]
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
+// CHECK:STDOUT:   %Foo: type = class_type @Foo, @Foo(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -446,6 +472,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc6_11.1: %C) {
@@ -457,6 +486,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Foo
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -510,6 +542,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc7_11.1: %C) {
@@ -546,14 +581,17 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %a.patt: %C = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %Foo.type: type = generic_class_type @Foo [template]
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
+// CHECK:STDOUT:   %Foo: type = class_type @Foo, @Foo(%a) [symbolic]
 // CHECK:STDOUT:   %Bar.type: type = generic_class_type @Bar [template]
 // CHECK:STDOUT:   %Bar.generic: %Bar.type = struct_value () [template]
+// CHECK:STDOUT:   %Bar: type = class_type @Bar, @Bar(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//two_file, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.05a: type = import_ref Main//two_file, D, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//two_file, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//two_file, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -585,6 +623,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "two_file.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(constants.%a: %C) {
@@ -596,6 +637,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Foo
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -608,6 +652,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Bar
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -635,6 +682,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %b.patt: %C = symbolic_binding_pattern b, 0 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.cb8: type = class_type @.1, @.1(%b) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -667,6 +715,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc7_11.1: %C) {
@@ -685,6 +736,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.cb8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -710,6 +764,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.cb8: type = class_type @.1, @.1(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -742,6 +797,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc7_11.1: %C) {
@@ -760,6 +818,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.cb8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -785,6 +846,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.cb8: type = class_type @.1, @.1(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -817,6 +879,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc7_11.1: %C) {
@@ -835,6 +900,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.cb8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -879,6 +947,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc6_11.1: %C) {
@@ -903,11 +974,13 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %a.patt: %C = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %Foo.type: type = generic_class_type @Foo [template]
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
+// CHECK:STDOUT:   %Foo: type = class_type @Foo, @Foo(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//alias_two_file, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//alias_two_file, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//alias_two_file, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -932,6 +1005,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "alias_two_file.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(constants.%a: %C) {
@@ -943,6 +1019,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Foo
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -964,6 +1043,7 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   %Foo.generic: %Foo.type = struct_value () [template]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.8e9: type = class_type @.1, @.1(%a) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -1000,6 +1080,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Foo(%a.loc6_11.1: %const) {
@@ -1018,6 +1101,9 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.8e9
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1086,6 +1172,11 @@ fn Base.F[addr self: Base*]() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .a = %.loc5_8
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[addr %self.param_patt: %ptr.11f]();
diff --git a/toolchain/check/testdata/class/raw_self.carbon b/toolchain/check/testdata/class/raw_self.carbon
index f364c1e26857..ec7b9143654f 100644
--- a/toolchain/check/testdata/class/raw_self.carbon
+++ b/toolchain/check/testdata/class/raw_self.carbon
@@ -157,6 +157,12 @@ fn Class.G[self: Self](r#self: i32) -> (i32, i32) {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .n = %.loc14_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[addr %self.param_patt.loc17_21: %ptr.e71](%self.param_patt.loc17_36: %i32) {
diff --git a/toolchain/check/testdata/class/raw_self_type.carbon b/toolchain/check/testdata/class/raw_self_type.carbon
index e08f4202aa9f..cdde983e293e 100644
--- a/toolchain/check/testdata/class/raw_self_type.carbon
+++ b/toolchain/check/testdata/class/raw_self_type.carbon
@@ -73,6 +73,10 @@ fn MemberNamedSelf.F(x: Self, y: r#Self) {}
 // CHECK:STDOUT:   %F.decl: %F.type.f1b = fn_decl @F.1 [template = constants.%F.1f2] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @MemberNamedSelf {
@@ -92,11 +96,19 @@ fn MemberNamedSelf.F(x: Self, y: r#Self) {}
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%MemberNamedSelf
+// CHECK:STDOUT:   .r#Self = %Self.decl
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Self {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Self
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1() {
diff --git a/toolchain/check/testdata/class/redeclaration.carbon b/toolchain/check/testdata/class/redeclaration.carbon
index 5829ff320100..70487827ebb5 100644
--- a/toolchain/check/testdata/class/redeclaration.carbon
+++ b/toolchain/check/testdata/class/redeclaration.carbon
@@ -83,6 +83,10 @@ fn Class.F[self: Self](b: bool) {}
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %Class](%b.param_patt: bool) {
diff --git a/toolchain/check/testdata/class/redeclaration_introducer.carbon b/toolchain/check/testdata/class/redeclaration_introducer.carbon
index 70f54143d62c..e89f987d00f7 100644
--- a/toolchain/check/testdata/class/redeclaration_introducer.carbon
+++ b/toolchain/check/testdata/class/redeclaration_introducer.carbon
@@ -52,15 +52,24 @@ abstract class C {}
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/reenter_scope.carbon b/toolchain/check/testdata/class/reenter_scope.carbon
index 8f0401d376c0..f901a4e500ac 100644
--- a/toolchain/check/testdata/class/reenter_scope.carbon
+++ b/toolchain/check/testdata/class/reenter_scope.carbon
@@ -79,6 +79,11 @@ fn Class.F() -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32 {
diff --git a/toolchain/check/testdata/class/reorder.carbon b/toolchain/check/testdata/class/reorder.carbon
index 82fbfc1786d3..60bbcb41f41c 100644
--- a/toolchain/check/testdata/class/reorder.carbon
+++ b/toolchain/check/testdata/class/reorder.carbon
@@ -79,6 +79,11 @@ class Class {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G() -> %i32 {
diff --git a/toolchain/check/testdata/class/reorder_qualified.carbon b/toolchain/check/testdata/class/reorder_qualified.carbon
index ecd227923398..a0a51470ae31 100644
--- a/toolchain/check/testdata/class/reorder_qualified.carbon
+++ b/toolchain/check/testdata/class/reorder_qualified.carbon
@@ -137,6 +137,12 @@ class A {
 // CHECK:STDOUT:   %.var: ref %A.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.ba9 [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
+// CHECK:STDOUT:   .B = %B.decl
+// CHECK:STDOUT:   .AF = %AF.decl
+// CHECK:STDOUT:   .a = %.loc46_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -149,6 +155,12 @@ class A {
 // CHECK:STDOUT:   %.var: ref %B.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.b.0a3 [template = constants.%complete_type.ba8]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .C = %C.decl
+// CHECK:STDOUT:   .BF = %BF.decl
+// CHECK:STDOUT:   .b = %.loc16_10
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -162,6 +174,12 @@ class A {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.c.b66 [template = constants.%complete_type.836]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .D = %D.decl
+// CHECK:STDOUT:   .CF = %CF.decl
+// CHECK:STDOUT:   .c = %.loc42_10
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -174,6 +192,12 @@ class A {
 // CHECK:STDOUT:   %.var: ref %D.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.d.b7b [template = constants.%complete_type.860]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .DF = %DF.decl
+// CHECK:STDOUT:   .d = %.loc24_12
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @BF();
diff --git a/toolchain/check/testdata/class/scope.carbon b/toolchain/check/testdata/class/scope.carbon
index ad83ee9d2965..5fedbf685985 100644
--- a/toolchain/check/testdata/class/scope.carbon
+++ b/toolchain/check/testdata/class/scope.carbon
@@ -108,6 +108,11 @@ fn Run() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1() -> %i32 {
diff --git a/toolchain/check/testdata/class/self.carbon b/toolchain/check/testdata/class/self.carbon
index 2ae6fef6942b..074bb2d27167 100644
--- a/toolchain/check/testdata/class/self.carbon
+++ b/toolchain/check/testdata/class/self.carbon
@@ -147,6 +147,12 @@ class Class {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
+// CHECK:STDOUT:   .n = %.loc8_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %Class]() -> %i32 {
@@ -212,6 +218,10 @@ class Class {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %Class]() -> <error>;
diff --git a/toolchain/check/testdata/class/self_conversion.carbon b/toolchain/check/testdata/class/self_conversion.carbon
index 0c6e7f422824..e36b3c50d1d8 100644
--- a/toolchain/check/testdata/class/self_conversion.carbon
+++ b/toolchain/check/testdata/class/self_conversion.carbon
@@ -136,6 +136,10 @@ fn Call(p: Derived*) -> i32 {
 // CHECK:STDOUT:   %.var: ref %Base.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a [template = constants.%complete_type.fd7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .a = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -169,6 +173,13 @@ fn Call(p: Derived*) -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.b1e [template = constants.%complete_type.15c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc16
+// CHECK:STDOUT:   .SelfBase = %SelfBase.decl
+// CHECK:STDOUT:   .AddrSelfBase = %AddrSelfBase.decl
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @SelfBase[%self.param_patt: %Base]() -> %i32 {
diff --git a/toolchain/check/testdata/class/self_type.carbon b/toolchain/check/testdata/class/self_type.carbon
index 597bc0d1b922..a7cbb49803f5 100644
--- a/toolchain/check/testdata/class/self_type.carbon
+++ b/toolchain/check/testdata/class/self_type.carbon
@@ -99,6 +99,12 @@ fn Class.F[self: Self]() -> i32 {
 // CHECK:STDOUT:   %.var: ref %Class.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.p [template = constants.%complete_type.56d]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .Make = %Make.decl
+// CHECK:STDOUT:   .p = %.loc18_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F[%self.param_patt: %Class]() -> %i32 {
diff --git a/toolchain/check/testdata/class/static_method.carbon b/toolchain/check/testdata/class/static_method.carbon
index 0ee2aff8bd1e..0447a9aae2d4 100644
--- a/toolchain/check/testdata/class/static_method.carbon
+++ b/toolchain/check/testdata/class/static_method.carbon
@@ -72,6 +72,10 @@ fn Run() -> i32 {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Class
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32;
diff --git a/toolchain/check/testdata/class/syntactic_merge_literal.carbon b/toolchain/check/testdata/class/syntactic_merge_literal.carbon
index d81a614d04fa..db43ce589f02 100644
--- a/toolchain/check/testdata/class/syntactic_merge_literal.carbon
+++ b/toolchain/check/testdata/class/syntactic_merge_literal.carbon
@@ -40,6 +40,7 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   %a.patt: %i32 = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.506: type = class_type @C, @C(%a) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %int_1000.ff9: Core.IntLiteral = int_value 1000 [template]
@@ -55,6 +56,7 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   %b.patt: %C.262 = symbolic_binding_pattern b, 0 [symbolic]
 // CHECK:STDOUT:   %D.type: type = generic_class_type @D [template]
 // CHECK:STDOUT:   %D.generic: %D.type = struct_value () [template]
+// CHECK:STDOUT:   %D: type = class_type @D, @D(%b) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -131,6 +133,9 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.506
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -143,6 +148,9 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%D
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -170,6 +178,7 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   %a.patt: %i32 = symbolic_binding_pattern a, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.506: type = class_type @C, @C(%a) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %int_1000.ff9: Core.IntLiteral = int_value 1000 [template]
@@ -187,6 +196,7 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   %D.generic: %D.type = struct_value () [template]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.3d2: type = class_type @.1, @.1(%b) [symbolic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -263,6 +273,9 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.506
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -282,6 +295,9 @@ class D(b:! C(1_000)) {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.3d2
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/class/todo_access_modifiers.carbon b/toolchain/check/testdata/class/todo_access_modifiers.carbon
index a08f4442c3cc..be1d6e5763a3 100644
--- a/toolchain/check/testdata/class/todo_access_modifiers.carbon
+++ b/toolchain/check/testdata/class/todo_access_modifiers.carbon
@@ -66,6 +66,13 @@ class Access {
 // CHECK:STDOUT:   %.var.loc19: ref %Access.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.k.l [template = constants.%complete_type.48a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Access
+// CHECK:STDOUT:   .F [private] = %F.decl
+// CHECK:STDOUT:   .G [protected] = %G.decl
+// CHECK:STDOUT:   .k [private] = %.loc17_16
+// CHECK:STDOUT:   .l [protected] = %.loc19_18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F();
diff --git a/toolchain/check/testdata/class/virtual_modifiers.carbon b/toolchain/check/testdata/class/virtual_modifiers.carbon
index 78a82416f8d1..46078101ea78 100644
--- a/toolchain/check/testdata/class/virtual_modifiers.carbon
+++ b/toolchain/check/testdata/class/virtual_modifiers.carbon
@@ -205,6 +205,10 @@ class Derived {
 // CHECK:STDOUT:   %.loc6: <vtable> = vtable (%H.decl) [template = constants.%.c3d]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .H = %H.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Abstract {
@@ -213,6 +217,11 @@ class Derived {
 // CHECK:STDOUT:   %.loc12: <vtable> = vtable (%J.decl, %K.decl) [template = constants.%.2b2]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Abstract
+// CHECK:STDOUT:   .J = %J.decl
+// CHECK:STDOUT:   .K = %K.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @H();
@@ -248,6 +257,8 @@ class Derived {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.917: type = import_ref Modifiers//default, Base, loaded [template = constants.%Base]
 // CHECK:STDOUT:   %import_ref.05e: <witness> = import_ref Modifiers//default, loc6_1, loaded [template = constants.%complete_type.513]
+// CHECK:STDOUT:   %import_ref.1f3 = import_ref Modifiers//default, inst16 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.2cc = import_ref Modifiers//default, loc5_17, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -269,10 +280,20 @@ class Derived {
 // CHECK:STDOUT:   %.loc9: <vtable> = vtable (%H.decl) [template = constants.%.dce]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.0e2]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc7
+// CHECK:STDOUT:   .H = %H.decl
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Base [from "modifiers.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.05e
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.1f3
+// CHECK:STDOUT:   .H = imports.%import_ref.2cc
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: impl fn @H.1();
@@ -308,6 +329,8 @@ class Derived {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.917: type = import_ref Modifiers//default, Base, loaded [template = constants.%Base]
 // CHECK:STDOUT:   %import_ref.05e: <witness> = import_ref Modifiers//default, loc6_1, loaded [template = constants.%complete_type.513]
+// CHECK:STDOUT:   %import_ref.1f3 = import_ref Modifiers//default, inst16 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.2cc = import_ref Modifiers//default, loc5_17, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -329,10 +352,20 @@ class Derived {
 // CHECK:STDOUT:   %.loc9: <vtable> = vtable (constants.%H, %F.decl) [template = constants.%.02f]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.0e2]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .base = %.loc8
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Base [from "modifiers.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.05e
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.1f3
+// CHECK:STDOUT:   .H = imports.%import_ref.2cc
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @F();
@@ -362,6 +395,8 @@ class Derived {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.917: type = import_ref Modifiers//default, Base, loaded [template = constants.%Base]
 // CHECK:STDOUT:   %import_ref.05e: <witness> = import_ref Modifiers//default, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.1f3 = import_ref Modifiers//default, inst16 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.2cc = import_ref Modifiers//default, loc5_17, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -377,6 +412,10 @@ class Derived {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Base [from "modifiers.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.05e
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.1f3
+// CHECK:STDOUT:   .H = imports.%import_ref.2cc
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
@@ -443,6 +482,10 @@ class Derived {
 // CHECK:STDOUT:   %.loc6: <vtable> = vtable (%F.decl) [template = constants.%.593]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type.513]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A1
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A2 {
@@ -452,6 +495,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc11: <vtable> = vtable (%F.decl) [template = constants.%.943]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base [template = constants.%complete_type.a6f]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A2
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %A1.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @F.1();
@@ -509,6 +558,10 @@ class Derived {
 // CHECK:STDOUT:   %.loc6: <vtable> = vtable (%F.decl) [template = constants.%.bc5]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type.513]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B1
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B2 {
@@ -518,6 +571,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc11: <vtable> = vtable (%F.decl) [template = constants.%.579]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.508 [template = constants.%complete_type.5ac]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B2
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %B1.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -527,6 +586,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc16: <vtable> = vtable (%F.decl) [template = constants.%.5f6]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.421 [template = constants.%complete_type.066]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .base = %.loc14
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %B2.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @F.1();
@@ -568,6 +633,10 @@ class Derived {
 // CHECK:STDOUT:   %.loc10: <vtable> = vtable () [template = constants.%.f2b]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: impl fn @F();
@@ -642,6 +711,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc9: <vtable> = vtable (%F.decl) [template = constants.%.5ee]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr.m1.m2 [template = constants.%complete_type.cf7]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .m1 = %.loc5_9
+// CHECK:STDOUT:   .m2 = %.loc6_9
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @F.1();
@@ -767,6 +842,9 @@ class Derived {
 // CHECK:STDOUT: class @Base {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -776,6 +854,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc10: <vtable> = vtable () [template = constants.%.f2b]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr.base [template = constants.%complete_type.336]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc8
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %Base.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: impl fn @F();
@@ -828,6 +912,10 @@ class Derived {
 // CHECK:STDOUT:   %.loc6: <vtable> = vtable (%F.decl) [template = constants.%.6ec]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type.513]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AbstractBase
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @AbstractIntermediate {
@@ -836,6 +924,11 @@ class Derived {
 // CHECK:STDOUT:   %.loc10: <vtable> = vtable (constants.%F.6e9) [template = constants.%.6ec]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.efd [template = constants.%complete_type.2d3]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%AbstractIntermediate
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   extend %AbstractBase.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -845,6 +938,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc15: <vtable> = vtable (%F.decl) [template = constants.%.88d]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.da5 [template = constants.%complete_type.f8c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %AbstractIntermediate.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: abstract fn @F.1();
@@ -899,6 +998,10 @@ class Derived {
 // CHECK:STDOUT:   %.loc6: <vtable> = vtable (%F.decl) [template = constants.%.def]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.vptr [template = constants.%complete_type.513]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%VirtualBase
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @VirtualIntermediate {
@@ -907,6 +1010,11 @@ class Derived {
 // CHECK:STDOUT:   %.loc10: <vtable> = vtable (constants.%F.3e7) [template = constants.%.def]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.61e [template = constants.%complete_type.f09]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%VirtualIntermediate
+// CHECK:STDOUT:   .base = %.loc9
+// CHECK:STDOUT:   extend %VirtualBase.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @Derived {
@@ -916,6 +1024,12 @@ class Derived {
 // CHECK:STDOUT:   %.loc15: <vtable> = vtable (%F.decl) [template = constants.%.88d]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.43c [template = constants.%complete_type.fa6]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   extend %VirtualIntermediate.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: virtual fn @F.1();
diff --git a/toolchain/check/testdata/deduce/array.carbon b/toolchain/check/testdata/deduce/array.carbon
index 855ed159efb1..875efe7cc796 100644
--- a/toolchain/check/testdata/deduce/array.carbon
+++ b/toolchain/check/testdata/deduce/array.carbon
@@ -209,6 +209,9 @@ fn G() -> i32 {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
@@ -399,6 +402,9 @@ fn G() -> i32 {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%N.loc6_6.1: Core.IntLiteral) {
@@ -567,6 +573,9 @@ fn G() -> i32 {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type, %N.loc6_16.1: Core.IntLiteral) {
@@ -733,6 +742,9 @@ fn G() -> i32 {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
@@ -927,11 +939,17 @@ fn G() -> i32 {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%N.loc7_6.1: Core.IntLiteral) {
@@ -1115,6 +1133,9 @@ fn G() -> i32 {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%N.loc6_6.1: %i32) {
diff --git a/toolchain/check/testdata/deduce/generic_type.carbon b/toolchain/check/testdata/deduce/generic_type.carbon
index 3b9e707c1745..54e9980b7856 100644
--- a/toolchain/check/testdata/deduce/generic_type.carbon
+++ b/toolchain/check/testdata/deduce/generic_type.carbon
@@ -160,12 +160,18 @@ fn G() -> i32 {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc7_6.1: type) {
@@ -334,12 +340,18 @@ fn G() -> i32 {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%I.ff1
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc7_6.1: type) {
@@ -550,6 +562,10 @@ fn G() -> i32 {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Outer.9d6
+// CHECK:STDOUT:     .Inner = %Inner.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -562,17 +578,26 @@ fn G() -> i32 {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Inner.c71
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc13_6.1: type, %U.loc13_16.1: type) {
@@ -810,6 +835,9 @@ fn G() -> i32 {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%WithNontype.8a6
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/deduce/tuple.carbon b/toolchain/check/testdata/deduce/tuple.carbon
index 650c883d7d0d..4e11b0be0465 100644
--- a/toolchain/check/testdata/deduce/tuple.carbon
+++ b/toolchain/check/testdata/deduce/tuple.carbon
@@ -145,11 +145,17 @@ fn G(pair: (C, D)) -> D {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc7_6.1: type, %U.loc7_16.1: type) {
@@ -225,6 +231,7 @@ fn G(pair: (C, D)) -> D {
 // CHECK:STDOUT:   %Pair.patt: %tuple.type.d07 = symbolic_binding_pattern Pair, 0 [symbolic]
 // CHECK:STDOUT:   %HasPair.type: type = generic_class_type @HasPair [template]
 // CHECK:STDOUT:   %HasPair.generic: %HasPair.type = struct_value () [template]
+// CHECK:STDOUT:   %HasPair.920: type = class_type @HasPair, @HasPair(%Pair) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %A: %i32 = bind_symbolic_name A, 0 [symbolic]
@@ -371,6 +378,9 @@ fn G(pair: (C, D)) -> D {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%HasPair.920
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -526,11 +536,17 @@ fn G(pair: (C, D)) -> D {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc7_6.1: type) {
diff --git a/toolchain/check/testdata/deduce/type_operator.carbon b/toolchain/check/testdata/deduce/type_operator.carbon
index eae445e3a04d..d99dc93fa9ea 100644
--- a/toolchain/check/testdata/deduce/type_operator.carbon
+++ b/toolchain/check/testdata/deduce/type_operator.carbon
@@ -141,6 +141,9 @@ fn G(p: C*) -> const C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
@@ -281,6 +284,9 @@ fn G(p: C*) -> const C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
@@ -423,6 +429,9 @@ fn G(p: C*) -> const C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
@@ -561,6 +570,9 @@ fn G(p: C*) -> const C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
diff --git a/toolchain/check/testdata/function/builtin/no_prelude/adapted_type.carbon b/toolchain/check/testdata/function/builtin/no_prelude/adapted_type.carbon
index 86ea8873b6f7..c8ece830142d 100644
--- a/toolchain/check/testdata/function/builtin/no_prelude/adapted_type.carbon
+++ b/toolchain/check/testdata/function/builtin/no_prelude/adapted_type.carbon
@@ -148,6 +148,9 @@ fn Int(N: MyIntLiteral) -> type = "int.make_type_signed";
 // CHECK:STDOUT:   adapt_decl %.loc7_21.2 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness Core.IntLiteral [template = constants.%complete_type.972]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%MyIntLiteral
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @MyInt32 {
@@ -175,6 +178,10 @@ fn Int(N: MyIntLiteral) -> type = "int.make_type_signed";
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %i32.builtin [template = constants.%complete_type.f8a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%MyInt32
+// CHECK:STDOUT:   .Make = %Make.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @IntLiteral() -> type = "int_literal.make_type";
@@ -247,6 +254,9 @@ fn Int(N: MyIntLiteral) -> type = "int.make_type_signed";
 // CHECK:STDOUT:   adapt_decl %.loc5_11 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%MyIntLiteral
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Int(%N.param_patt: %MyIntLiteral) -> type;
diff --git a/toolchain/check/testdata/function/call/prefer_unqualified_lookup.carbon b/toolchain/check/testdata/function/call/prefer_unqualified_lookup.carbon
index 7e998ef5fe2d..ace1e8e05059 100644
--- a/toolchain/check/testdata/function/call/prefer_unqualified_lookup.carbon
+++ b/toolchain/check/testdata/function/call/prefer_unqualified_lookup.carbon
@@ -30,7 +30,9 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:   %F.patt: type = symbolic_binding_pattern F, 0 [symbolic]
 // CHECK:STDOUT:   %Class.type: type = generic_class_type @Class [template]
 // CHECK:STDOUT:   %Class.generic: %Class.type = struct_value () [template]
+// CHECK:STDOUT:   %Class: type = class_type @Class, @Class(%F.8b3) [symbolic]
 // CHECK:STDOUT:   %Inner.b32: type = class_type @Inner [template]
+// CHECK:STDOUT:   %Inner.6e0: type = class_type @Inner, @Inner(%F.8b3) [symbolic]
 // CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [template]
 // CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [template]
 // CHECK:STDOUT:   %F.type: type = fn_type @F, @Inner(%F.8b3) [symbolic]
@@ -95,6 +97,10 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:     %Inner.decl: type = class_decl @Inner [template = constants.%Inner.b32] {} {}
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Class
+// CHECK:STDOUT:     .Inner = %Inner.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -127,6 +133,11 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Inner.6e0
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:     .G = %G.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/function/declaration/no_prelude/extern.carbon b/toolchain/check/testdata/function/declaration/no_prelude/extern.carbon
index c614f15f43d5..7126f935e371 100644
--- a/toolchain/check/testdata/function/declaration/no_prelude/extern.carbon
+++ b/toolchain/check/testdata/function/declaration/no_prelude/extern.carbon
@@ -202,6 +202,11 @@ extern library "basic" fn F();
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F();
diff --git a/toolchain/check/testdata/function/declaration/no_prelude/fail_import_incomplete_return.carbon b/toolchain/check/testdata/function/declaration/no_prelude/fail_import_incomplete_return.carbon
index 07c075df466e..9e90661ba12a 100644
--- a/toolchain/check/testdata/function/declaration/no_prelude/fail_import_incomplete_return.carbon
+++ b/toolchain/check/testdata/function/declaration/no_prelude/fail_import_incomplete_return.carbon
@@ -156,6 +156,9 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ReturnCUnused() -> %C;
@@ -203,6 +206,7 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   %import_ref.e1f: %ReturnDUsed.type = import_ref Main//incomplete_return, ReturnDUsed, loaded [template = constants.%ReturnDUsed]
 // CHECK:STDOUT:   %import_ref.2ce = import_ref Main//incomplete_return, Call, unloaded
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//incomplete_return, loc37_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref Main//incomplete_return, inst16 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -224,6 +228,9 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "fail_incomplete_return.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @CallFAndGIncomplete() {
diff --git a/toolchain/check/testdata/function/declaration/no_prelude/name_poisoning.carbon b/toolchain/check/testdata/function/declaration/no_prelude/name_poisoning.carbon
index d7f09a524296..ae96692ca1c7 100644
--- a/toolchain/check/testdata/function/declaration/no_prelude/name_poisoning.carbon
+++ b/toolchain/check/testdata/function/declaration/no_prelude/name_poisoning.carbon
@@ -384,11 +384,17 @@ fn F() {
 // CHECK:STDOUT: class @C.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C.f79
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C.2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C.9f4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C.9f4);
@@ -434,6 +440,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C);
@@ -472,11 +481,17 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.fb7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C);
@@ -563,6 +578,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C);
@@ -594,6 +612,9 @@ fn F() {
 // CHECK:STDOUT: class @C1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -613,11 +634,19 @@ fn F() {
 // CHECK:STDOUT:   %.var: ref %D.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.C1 [template = constants.%complete_type.ec1]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .F1 = %F1.decl
+// CHECK:STDOUT:   .C2 = %C2.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C1);
@@ -657,6 +686,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C);
@@ -707,6 +739,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1() -> %C;
@@ -759,11 +794,17 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.fb7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C);
@@ -787,10 +828,13 @@ fn F() {
 // CHECK:STDOUT:   %D2.type: type = facet_type <@D2> [template]
 // CHECK:STDOUT:   %Self.8cf: %D2.type = bind_symbolic_name Self, 0 [symbolic]
 // CHECK:STDOUT:   %D3.b65: type = class_type @D3 [template]
+// CHECK:STDOUT:   %D3.68e: type = class_type @D3, @D3(%Self.8cf) [symbolic]
 // CHECK:STDOUT:   %F.type: type = fn_type @F, @D3(%Self.8cf) [symbolic]
 // CHECK:STDOUT:   %F: %F.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %.c1e: type = class_type @.1 [template]
+// CHECK:STDOUT:   %.180: type = class_type @.1, @.1(%Self.8cf) [symbolic]
 // CHECK:STDOUT:   %.9af: type = class_type @.2 [template]
+// CHECK:STDOUT:   %.5c1: type = class_type @.2, @.2(%Self.8cf) [symbolic]
 // CHECK:STDOUT:   %.6ae: type = class_type @.3 [template]
 // CHECK:STDOUT:   %.1c0: type = class_type @.4 [template]
 // CHECK:STDOUT:   %.type: type = facet_type <@.6> [template]
@@ -841,6 +885,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D1 {
@@ -848,6 +895,10 @@ fn F() {
 // CHECK:STDOUT:   %.decl: type = class_decl @.3 [template = constants.%.6ae] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D1
+// CHECK:STDOUT:   .D2 = %D2.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @D3(@D2.%Self: %D2.type) {
@@ -868,6 +919,10 @@ fn F() {
 // CHECK:STDOUT:     %.decl: type = class_decl @.1 [template = constants.%.c1e] {} {}
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%D3.68e
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -877,6 +932,9 @@ fn F() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.180
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -886,22 +944,34 @@ fn F() {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.5c1
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.3 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.6ae
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.4 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.1c0
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.5 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.4b5
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(@D2.%Self: %D2.type) {
@@ -941,6 +1011,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- ignored_poison_in_import.carbon
@@ -972,6 +1045,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- poison.impl.carbon
@@ -1004,6 +1080,9 @@ fn F() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- using_poisoned_name_in_impl.carbon
@@ -1061,6 +1140,10 @@ fn F() {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness () [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
+// CHECK:STDOUT:   extend @impl.%C.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F1(%x.param_patt: %C.type);
@@ -1074,6 +1157,7 @@ fn F() {
 // CHECK:STDOUT:   %B: %B.type = struct_value () [template]
 // CHECK:STDOUT:   %B.assoc_type: type = assoc_entity_type %A.type, %B.type [template]
 // CHECK:STDOUT:   %assoc0: %B.assoc_type = assoc_entity element0, @A.%B.decl [template]
+// CHECK:STDOUT:   %X: type = class_type @X [template]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {}
@@ -1093,6 +1177,10 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   complete_type_witness = invalid
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
+// CHECK:STDOUT:   extend <unexpected>.inst27.loc8_18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @B(@A.%Self: %A.type) {
@@ -1137,11 +1225,17 @@ fn F() {
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.a95
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.fb7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%x.param_patt: <error>);
@@ -1171,6 +1265,9 @@ fn F() {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
@@ -1182,11 +1279,18 @@ fn F() {
 // CHECK:STDOUT:   %.decl: type = class_decl @.1 [template = constants.%.96d] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.v [template = constants.%complete_type.57e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .v = %.loc9_10
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @.1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%.96d
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/function/definition/no_prelude/syntactic_merge.carbon b/toolchain/check/testdata/function/definition/no_prelude/syntactic_merge.carbon
index f49f0bf8d18d..88ac06739939 100644
--- a/toolchain/check/testdata/function/definition/no_prelude/syntactic_merge.carbon
+++ b/toolchain/check/testdata/function/definition/no_prelude/syntactic_merge.carbon
@@ -228,6 +228,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C) {
@@ -277,6 +280,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo[](%a.param_patt: %C) {
@@ -323,6 +329,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C);
@@ -369,6 +378,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C) {
@@ -419,6 +431,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C);
@@ -441,6 +456,7 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//two_file, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.05a: type = import_ref Main//two_file, D, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//two_file, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//two_file, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -472,6 +488,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "two_file.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C) [from "two_file.carbon"] {
@@ -526,6 +545,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C);
@@ -577,6 +599,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C);
@@ -630,6 +655,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Foo(%a.loc7_8.1: %C) {
@@ -702,6 +730,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo() -> %return.param_patt: %C {
@@ -741,6 +772,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C);
@@ -758,6 +792,7 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//alias_two_file, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//alias_two_file, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//alias_two_file, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -782,6 +817,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "alias_two_file.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %C) [from "alias_two_file.carbon"] {
@@ -836,6 +874,9 @@ fn Foo(a: const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo(%a.param_patt: %const);
diff --git a/toolchain/check/testdata/function/generic/deduce.carbon b/toolchain/check/testdata/function/generic/deduce.carbon
index eb41ee84e446..ce3706a3e413 100644
--- a/toolchain/check/testdata/function/generic/deduce.carbon
+++ b/toolchain/check/testdata/function/generic/deduce.carbon
@@ -564,6 +564,9 @@ fn CallImplicitNotDeducible() {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @ExplicitAndAlsoDeduced(%T.loc6_27.1: type) {
diff --git a/toolchain/check/testdata/function/generic/no_prelude/call.carbon b/toolchain/check/testdata/function/generic/no_prelude/call.carbon
index b72b2f0baf1e..726d7a70cbe5 100644
--- a/toolchain/check/testdata/function/generic/no_prelude/call.carbon
+++ b/toolchain/check/testdata/function/generic/no_prelude/call.carbon
@@ -158,6 +158,9 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Function(%T.loc4_13.1: type) {
@@ -374,6 +377,9 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Function(%T.loc4_13.1: type) {
diff --git a/toolchain/check/testdata/function/generic/no_prelude/import_specific.carbon b/toolchain/check/testdata/function/generic/no_prelude/import_specific.carbon
index fd5ef6055406..fd79af23e2da 100644
--- a/toolchain/check/testdata/function/generic/no_prelude/import_specific.carbon
+++ b/toolchain/check/testdata/function/generic/no_prelude/import_specific.carbon
@@ -151,6 +151,9 @@ fn H() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @H() {
diff --git a/toolchain/check/testdata/function/generic/return_slot.carbon b/toolchain/check/testdata/function/generic/return_slot.carbon
index cda144380bda..4892f7f4f98f 100644
--- a/toolchain/check/testdata/function/generic/return_slot.carbon
+++ b/toolchain/check/testdata/function/generic/return_slot.carbon
@@ -28,6 +28,7 @@ fn G() {
 // CHECK:STDOUT:   %Wrap.type: type = generic_class_type @Wrap [template]
 // CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [template]
 // CHECK:STDOUT:   %Wrap.generic: %Wrap.type = struct_value () [template]
+// CHECK:STDOUT:   %Wrap.af6: type = class_type @Wrap, @Wrap(%T) [symbolic]
 // CHECK:STDOUT:   %Make.type.652: type = fn_type @Make, @Wrap(%T) [symbolic]
 // CHECK:STDOUT:   %Make.eb2: %Make.type.652 = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
@@ -107,6 +108,10 @@ fn G() {
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%Wrap.af6
+// CHECK:STDOUT:     .Make = %Make.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -118,6 +123,10 @@ fn G() {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.arr.5f2 [template = constants.%complete_type.22a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .arr = %.loc15_18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Make(@Wrap.%T.loc11_12.1: type) {
diff --git a/toolchain/check/testdata/generic/complete_type.carbon b/toolchain/check/testdata/generic/complete_type.carbon
index d91098db33d1..37cffd5c0386 100644
--- a/toolchain/check/testdata/generic/complete_type.carbon
+++ b/toolchain/check/testdata/generic/complete_type.carbon
@@ -140,6 +140,9 @@ fn G() { F(B); }
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @A(%T.loc6_9.1: type) {
@@ -161,6 +164,10 @@ fn G() { F(B); }
 // CHECK:STDOUT:     %.var: ref @A.%A.elem (%A.elem.1ce) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc14_1.1: <witness> = complete_type_witness %struct_type.v.ff1 [symbolic = %complete_type.loc14_1.2 (constants.%complete_type.460)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc14_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%A.130
+// CHECK:STDOUT:     .v = %.loc13_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -235,6 +242,9 @@ fn G() { F(B); }
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc6_6.1: type) {
diff --git a/toolchain/check/testdata/generic/local.carbon b/toolchain/check/testdata/generic/local.carbon
index 49c770904d0d..51564f17226c 100644
--- a/toolchain/check/testdata/generic/local.carbon
+++ b/toolchain/check/testdata/generic/local.carbon
@@ -114,6 +114,10 @@ class C(C:! type) {
 // CHECK:STDOUT:     %.var: ref @C.%C.elem (%C.elem.cca) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc7_3.1: <witness> = complete_type_witness %struct_type.x.2ac [symbolic = %complete_type.loc7_3.2 (constants.%complete_type.4339)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc7_3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f06
+// CHECK:STDOUT:     .x = %.loc6_10
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -181,6 +185,7 @@ class C(C:! type) {
 // CHECK:STDOUT:   %C.patt: type = symbolic_binding_pattern C, 0 [symbolic]
 // CHECK:STDOUT:   %.type: type = generic_class_type @.1 [template]
 // CHECK:STDOUT:   %.generic: %.type = struct_value () [template]
+// CHECK:STDOUT:   %.de1: type = class_type @.1, @.1(%C) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -210,6 +215,9 @@ class C(C:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%.de1
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -237,6 +245,7 @@ class C(C:! type) {
 // CHECK:STDOUT:   %C.patt: type = symbolic_binding_pattern C, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.f2e: type = class_type @C, @C(%C.8b3) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT: }
@@ -272,6 +281,9 @@ class C(C:! type) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/global/class_obj.carbon b/toolchain/check/testdata/global/class_obj.carbon
index e6502bdb6db1..1ac5e9b602fc 100644
--- a/toolchain/check/testdata/global/class_obj.carbon
+++ b/toolchain/check/testdata/global/class_obj.carbon
@@ -47,6 +47,9 @@ var a: A = {};
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/global/class_with_fun.carbon b/toolchain/check/testdata/global/class_with_fun.carbon
index 6631c5113658..94131bc5dcba 100644
--- a/toolchain/check/testdata/global/class_with_fun.carbon
+++ b/toolchain/check/testdata/global/class_with_fun.carbon
@@ -62,6 +62,9 @@ var a: A = {};
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ret_a() -> %return.param_patt: %A {
diff --git a/toolchain/check/testdata/if_expr/fail_not_in_function.carbon b/toolchain/check/testdata/if_expr/fail_not_in_function.carbon
index c754614d2884..83a26aee75d9 100644
--- a/toolchain/check/testdata/if_expr/fail_not_in_function.carbon
+++ b/toolchain/check/testdata/if_expr/fail_not_in_function.carbon
@@ -119,6 +119,10 @@ class C {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .n = %.loc54_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%a.param_patt: %i32);
diff --git a/toolchain/check/testdata/impl/extend_impl.carbon b/toolchain/check/testdata/impl/extend_impl.carbon
index 69d4d05dc2c0..2faaa1f5039a 100644
--- a/toolchain/check/testdata/impl/extend_impl.carbon
+++ b/toolchain/check/testdata/impl/extend_impl.carbon
@@ -98,6 +98,10 @@ fn G(c: C) {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.%HasF.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@HasF.%Self: %HasF.type) {
diff --git a/toolchain/check/testdata/impl/extend_impl_generic.carbon b/toolchain/check/testdata/impl/extend_impl_generic.carbon
index dc446e9214d1..2c66f9853431 100644
--- a/toolchain/check/testdata/impl/extend_impl_generic.carbon
+++ b/toolchain/check/testdata/impl/extend_impl_generic.carbon
@@ -183,6 +183,10 @@ class X(U:! type) {
 // CHECK:STDOUT:   %.var: ref %Param.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x.ed6 [template = constants.%complete_type.1ec]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Param
+// CHECK:STDOUT:   .x = %.loc9_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -195,6 +199,10 @@ class X(U:! type) {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.1.%F.decl) [template = constants.%impl_witness.9bf]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.1.%HasF.type
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@HasF.%T.loc4_16.1: type, @HasF.%Self.1: @HasF.%HasF.type (%HasF.type.901)) {
@@ -449,6 +457,10 @@ class X(U:! type) {
 // CHECK:STDOUT:     %.loc9: type = specific_constant @impl.%I.type.loc9_21.1, @impl(constants.%U) [symbolic = %I.type (constants.%I.type.325e65.2)]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%X
+// CHECK:STDOUT:     extend %.loc9
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/fail_extend_impl_forall.carbon b/toolchain/check/testdata/impl/fail_extend_impl_forall.carbon
index 73a4a91b0fa8..ffe072e16986 100644
--- a/toolchain/check/testdata/impl/fail_extend_impl_forall.carbon
+++ b/toolchain/check/testdata/impl/fail_extend_impl_forall.carbon
@@ -144,6 +144,10 @@ class C {
 // CHECK:STDOUT:   %.loc20: type = specific_constant @impl.%GenericInterface.type.loc20_54.1, @impl(constants.%T) [symbolic = constants.%GenericInterface.type.3fe]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@GenericInterface.%T.loc11_28.1: type, @GenericInterface.%Self.1: @GenericInterface.%GenericInterface.type (%GenericInterface.type.3fe)) {
diff --git a/toolchain/check/testdata/impl/fail_extend_impl_type_as.carbon b/toolchain/check/testdata/impl/fail_extend_impl_type_as.carbon
index 433e5c3d9891..76f085334581 100644
--- a/toolchain/check/testdata/impl/fail_extend_impl_type_as.carbon
+++ b/toolchain/check/testdata/impl/fail_extend_impl_type_as.carbon
@@ -111,6 +111,10 @@ class E {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness () [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -121,6 +125,10 @@ class E {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness () [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   extend @impl.2.%I.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @E {
@@ -131,5 +139,9 @@ class E {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness () [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%E
+// CHECK:STDOUT:   extend @impl.3.%I.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/fail_extend_non_interface.carbon b/toolchain/check/testdata/impl/fail_extend_non_interface.carbon
index 054e9a148f8e..20e25dbc3cb4 100644
--- a/toolchain/check/testdata/impl/fail_extend_non_interface.carbon
+++ b/toolchain/check/testdata/impl/fail_extend_non_interface.carbon
@@ -61,5 +61,9 @@ class C {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/fail_extend_partially_defined_interface.carbon b/toolchain/check/testdata/impl/fail_extend_partially_defined_interface.carbon
index a2a3c2bf579f..677dc835a48d 100644
--- a/toolchain/check/testdata/impl/fail_extend_partially_defined_interface.carbon
+++ b/toolchain/check/testdata/impl/fail_extend_partially_defined_interface.carbon
@@ -80,6 +80,11 @@ interface I {
 // CHECK:STDOUT:     %.loc24: type = specific_constant @impl.%I.ref, @impl(constants.%Self) [template = constants.%I.type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.6b4
+// CHECK:STDOUT:     extend %.loc24
+// CHECK:STDOUT:     has_error
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/fail_extend_undefined_interface.carbon b/toolchain/check/testdata/impl/fail_extend_undefined_interface.carbon
index 01461cbb3cae..b1ef9c94c65b 100644
--- a/toolchain/check/testdata/impl/fail_extend_undefined_interface.carbon
+++ b/toolchain/check/testdata/impl/fail_extend_undefined_interface.carbon
@@ -99,6 +99,11 @@ fn F(c: C) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.%I.ref
+// CHECK:STDOUT:   has_error
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%c.param_patt: %C) {
diff --git a/toolchain/check/testdata/impl/fail_impl_bad_assoc_fn.carbon b/toolchain/check/testdata/impl/fail_impl_bad_assoc_fn.carbon
index 8c238d044fc4..540f4fe8a950 100644
--- a/toolchain/check/testdata/impl/fail_impl_bad_assoc_fn.carbon
+++ b/toolchain/check/testdata/impl/fail_impl_bad_assoc_fn.carbon
@@ -826,6 +826,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.1]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NoF
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FNotFunction {
@@ -836,6 +839,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.2]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FNotFunction
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @F.16;
@@ -848,6 +854,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.3]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FAlias
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FExtraParam {
@@ -858,6 +867,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.4]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FExtraParam
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FExtraImplicitParam {
@@ -868,6 +880,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.5]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FExtraImplicitParam
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FExtraReturnType {
@@ -878,6 +893,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.6]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FExtraReturnType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FMissingParam {
@@ -888,6 +906,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.7]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FMissingParam
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FMissingImplicitParam {
@@ -898,6 +919,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.8]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FMissingImplicitParam
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FMissingReturnType {
@@ -908,6 +932,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.9]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FMissingReturnType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FDifferentParamType {
@@ -918,6 +945,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.10]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FDifferentParamType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FDifferentImplicitParamType {
@@ -928,6 +958,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.11]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FDifferentImplicitParamType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FDifferentReturnType {
@@ -938,6 +971,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.12]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FDifferentReturnType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @FDifferentParamName {
@@ -948,6 +984,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.13]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%FDifferentParamName
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SelfNestedBadParam {
@@ -958,6 +997,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.14]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SelfNestedBadParam
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SelfNestedBadReturnType {
@@ -968,6 +1010,9 @@ class SelfNestedBadReturnType {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85bcb7.15]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SelfNestedBadReturnType
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
diff --git a/toolchain/check/testdata/impl/fail_self_type_mismatch.carbon b/toolchain/check/testdata/impl/fail_self_type_mismatch.carbon
index 691f6ee3c9ab..3443045e63b6 100644
--- a/toolchain/check/testdata/impl/fail_self_type_mismatch.carbon
+++ b/toolchain/check/testdata/impl/fail_self_type_mismatch.carbon
@@ -34,6 +34,7 @@ impl i32 as I {
 // CHECK:STDOUT:   %X.patt: %T = symbolic_binding_pattern X, 1 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.b36: type = class_type @C, @C(%T, %X) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %I.type: type = facet_type <@I> [template]
@@ -142,6 +143,9 @@ impl i32 as I {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.b36
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/fail_todo_use_assoc_const.carbon b/toolchain/check/testdata/impl/fail_todo_use_assoc_const.carbon
index 55541d667732..a8dff3086fc2 100644
--- a/toolchain/check/testdata/impl/fail_todo_use_assoc_const.carbon
+++ b/toolchain/check/testdata/impl/fail_todo_use_assoc_const.carbon
@@ -262,6 +262,9 @@ impl () as I where .N = 2 {
 // CHECK:STDOUT:   adapt_decl %.loc28_11 [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@J.%Self: %J.type) {
diff --git a/toolchain/check/testdata/impl/impl_as.carbon b/toolchain/check/testdata/impl/impl_as.carbon
index f2c8182ea986..28385c31c29d 100644
--- a/toolchain/check/testdata/impl/impl_as.carbon
+++ b/toolchain/check/testdata/impl/impl_as.carbon
@@ -85,6 +85,9 @@ class C {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@Simple.%Self: %Simple.type) {
diff --git a/toolchain/check/testdata/impl/lookup/alias.carbon b/toolchain/check/testdata/impl/lookup/alias.carbon
index 1027955ce228..178d2171cb7d 100644
--- a/toolchain/check/testdata/impl/lookup/alias.carbon
+++ b/toolchain/check/testdata/impl/lookup/alias.carbon
@@ -103,6 +103,10 @@ fn G(c: C) {
 // CHECK:STDOUT:   %G: %F.assoc_type = bind_alias G, @HasF.%assoc0 [template = constants.%assoc0]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .G = %G
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@HasF.%Self: %HasF.type) {
diff --git a/toolchain/check/testdata/impl/lookup/fail_alias_impl_not_found.carbon b/toolchain/check/testdata/impl/lookup/fail_alias_impl_not_found.carbon
index 196807c82ac6..95fdc52ffca9 100644
--- a/toolchain/check/testdata/impl/lookup/fail_alias_impl_not_found.carbon
+++ b/toolchain/check/testdata/impl/lookup/fail_alias_impl_not_found.carbon
@@ -89,6 +89,10 @@ fn F(c: C) {
 // CHECK:STDOUT:   %F: %F.assoc_type = bind_alias F, @I.%assoc0 [template = constants.%assoc0]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
diff --git a/toolchain/check/testdata/impl/lookup/fail_todo_undefined_impl.carbon b/toolchain/check/testdata/impl/lookup/fail_todo_undefined_impl.carbon
index 0e2e31fdbc01..795af4c863ba 100644
--- a/toolchain/check/testdata/impl/lookup/fail_todo_undefined_impl.carbon
+++ b/toolchain/check/testdata/impl/lookup/fail_todo_undefined_impl.carbon
@@ -122,6 +122,10 @@ impl C as I {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (<error>) [template = constants.%impl_witness.85b]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.1.%I.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
diff --git a/toolchain/check/testdata/impl/lookup/generic.carbon b/toolchain/check/testdata/impl/lookup/generic.carbon
index 5f2dbe5b3b56..adf6e9d744b0 100644
--- a/toolchain/check/testdata/impl/lookup/generic.carbon
+++ b/toolchain/check/testdata/impl/lookup/generic.carbon
@@ -599,6 +599,9 @@ fn G(x: A) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1157,11 +1160,17 @@ fn G(x: A) {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@HasF.%T.loc4_16.1: type, @HasF.%Self.1: @HasF.%HasF.type (%HasF.type.901)) {
diff --git a/toolchain/check/testdata/impl/lookup/instance_method.carbon b/toolchain/check/testdata/impl/lookup/instance_method.carbon
index d04c7fd86e61..f6947b14fef9 100644
--- a/toolchain/check/testdata/impl/lookup/instance_method.carbon
+++ b/toolchain/check/testdata/impl/lookup/instance_method.carbon
@@ -139,6 +139,10 @@ fn F(c: C) -> i32 {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.%I.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
diff --git a/toolchain/check/testdata/impl/lookup/no_prelude/impl_forall.carbon b/toolchain/check/testdata/impl/lookup/no_prelude/impl_forall.carbon
index e5d09a5cf8fc..2fdfba5b12b4 100644
--- a/toolchain/check/testdata/impl/lookup/no_prelude/impl_forall.carbon
+++ b/toolchain/check/testdata/impl/lookup/no_prelude/impl_forall.carbon
@@ -282,6 +282,10 @@ fn TestSpecific(a: A({})) -> {} {
 // CHECK:STDOUT:     %.var: ref @A.%A.elem (%A.elem.1ceb36.1) = var <invalid>
 // CHECK:STDOUT:     %complete_type.loc4_1.1: <witness> = complete_type_witness %struct_type.n.848971.1 [symbolic = %complete_type.loc4_1.2 (constants.%complete_type.84bb3d.1)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc4_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%A.13025a.1
+// CHECK:STDOUT:     .n = %.loc3_8
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/lookup/no_prelude/import.carbon b/toolchain/check/testdata/impl/lookup/no_prelude/import.carbon
index 75ba7860f63f..ace64b502b8a 100644
--- a/toolchain/check/testdata/impl/lookup/no_prelude/import.carbon
+++ b/toolchain/check/testdata/impl/lookup/no_prelude/import.carbon
@@ -244,6 +244,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@HasF.%Self: %HasF.type) {
@@ -299,6 +302,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref PackageA//default, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref PackageA//default, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref PackageA//default, inst25 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.91b: type = import_ref PackageA//default, HasF, loaded [template = constants.%HasF.type]
 // CHECK:STDOUT:   %import_ref.28c = import_ref PackageA//default, inst15 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.798 = import_ref PackageA//default, loc5_9, unloaded
@@ -378,10 +382,16 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "package_a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @G.1(@HasG.%Self: %HasG.type) {
@@ -446,6 +456,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref PackageA//default, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref PackageA//default, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref PackageA//default, inst25 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.91b: type = import_ref PackageA//default, HasF, loaded [template = constants.%HasF.type]
 // CHECK:STDOUT:   %import_ref.28c = import_ref PackageA//default, inst15 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.5f1: %F.assoc_type = import_ref PackageA//default, loc5_9, loaded [template = constants.%assoc0]
@@ -488,6 +499,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "package_a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestCF(%c.param_patt: %C) {
@@ -542,12 +556,14 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.b0a: type = import_ref PackageB//default, D, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref PackageB//default, loc10_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref PackageB//default, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.91b: type = import_ref PackageA//default, HasF, loaded [template = constants.%HasF.type]
 // CHECK:STDOUT:   %import_ref.28c = import_ref PackageA//default, inst15 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.5f1: %F.assoc_type = import_ref PackageA//default, loc5_9, loaded [template = constants.%assoc0]
 // CHECK:STDOUT:   %import_ref.8fe = import_ref PackageA//default, F, unloaded
 // CHECK:STDOUT:   %import_ref.0e8 = import_ref PackageA//default, loc11_16, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref PackageA//default, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref PackageA//default, inst25 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.29a: type = import_ref PackageA//default, loc11_6, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.e8c: type = import_ref PackageA//default, loc11_11, loaded [template = constants.%HasF.type]
 // CHECK:STDOUT:   %import_ref.fa0 = import_ref PackageB//default, loc13_25, unloaded
@@ -621,10 +637,16 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "package_b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "package_a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestDF(%d.param_patt: %D) {
@@ -679,6 +701,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref PackageA//default, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref PackageA//default, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref PackageA//default, inst25 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.924: type = import_ref PackageB//default, HasG, loaded [template = constants.%HasG.type]
 // CHECK:STDOUT:   %import_ref.5d8 = import_ref PackageB//default, inst17 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.d8a: %G.assoc_type = import_ref PackageB//default, loc7_9, loaded [template = constants.%assoc0]
@@ -694,6 +717,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   %import_ref.cee586.1: type = import_ref PackageB//default, loc13_20, loaded [template = constants.%HasG.type]
 // CHECK:STDOUT:   %import_ref.7db = import_ref PackageB//default, loc18_25, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref PackageB//default, loc10_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref PackageB//default, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.aa9f8a.1: type = import_ref PackageB//default, loc18_6, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.831: type = import_ref PackageB//default, loc18_19, loaded [template = constants.%HasF.type]
 // CHECK:STDOUT:   %import_ref.231 = import_ref PackageB//default, loc23_16, unloaded
@@ -758,10 +782,16 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "package_a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "package_b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestCG(%c.param_patt: %C) {
@@ -813,12 +843,14 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.b0aa: type = import_ref PackageB//default, D, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref PackageB//default, loc10_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref PackageB//default, inst27 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.924: type = import_ref PackageB//default, HasG, loaded [template = constants.%HasG.type]
 // CHECK:STDOUT:   %import_ref.5d8 = import_ref PackageB//default, inst17 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.d8a: %G.assoc_type = import_ref PackageB//default, loc7_9, loaded [template = constants.%assoc0]
 // CHECK:STDOUT:   %import_ref.992 = import_ref PackageB//default, G, unloaded
 // CHECK:STDOUT:   %import_ref.fa0 = import_ref PackageB//default, loc13_25, unloaded
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref PackageB//default, inst35 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref PackageB//default, inst36 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.dfb: type = import_ref PackageB//default, loc13_14, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.cee586.1: type = import_ref PackageB//default, loc13_20, loaded [template = constants.%HasG.type]
 // CHECK:STDOUT:   %import_ref.7db = import_ref PackageB//default, loc18_25, unloaded
@@ -882,10 +914,16 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "package_b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "package_b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestDG(%d.param_patt: %D) {
@@ -1050,6 +1088,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   %X.patt: %T = symbolic_binding_pattern X, 1 [symbolic]
 // CHECK:STDOUT:   %AnyParam.type: type = generic_class_type @AnyParam [template]
 // CHECK:STDOUT:   %AnyParam.generic: %AnyParam.type = struct_value () [template]
+// CHECK:STDOUT:   %AnyParam: type = class_type @AnyParam, @AnyParam(%T, %X) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %Y.type: type = facet_type <@Y> [template]
@@ -1102,6 +1141,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%AnyParam
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1165,6 +1207,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8b7: %AnyParam.type = import_ref PackageHasParam//default, AnyParam, loaded [template = constants.%AnyParam.generic]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref PackageHasParam//default, loc4_34, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.601 = import_ref PackageHasParam//default, inst34 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.d7e: type = import_ref PackageHasParam//default, Y, loaded [template = constants.%Y.type]
 // CHECK:STDOUT:   %import_ref.dc1 = import_ref PackageHasParam//default, inst40 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.df6: %K.assoc_type = import_ref PackageHasParam//default, loc7_10, loaded [template = constants.%assoc0]
@@ -1239,6 +1282,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.601
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1351,6 +1397,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8b7: %AnyParam.type = import_ref PackageHasParam//default, AnyParam, loaded [template = constants.%AnyParam.generic]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref PackageHasParam//default, loc4_34, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.601 = import_ref PackageHasParam//default, inst34 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.3e7: %GenericInterface.type.0da = import_ref PackageGenericInterface//default, GenericInterface, loaded [template = constants.%GenericInterface.generic]
 // CHECK:STDOUT:   %import_ref.c3b = import_ref PackageGenericInterface//default, inst28 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.d7e: type = import_ref PackageHasParam//default, Y, loaded [template = constants.%Y.type]
@@ -1410,6 +1457,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.601
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1497,6 +1547,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   %T.patt: type = symbolic_binding_pattern T, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.f2e: type = class_type @C, @C(%T) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %I.type: type = facet_type <@I> [template]
@@ -1653,6 +1704,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1717,6 +1771,7 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.740: %C.type = import_ref HasExtraInterfaces//default, C, loaded [template = constants.%C.generic]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref HasExtraInterfaces//default, loc13_20, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref HasExtraInterfaces//default, inst57 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.df2: type = import_ref HasExtraInterfaces//default, I, loaded [template = constants.%I.type]
 // CHECK:STDOUT:   %import_ref.e5d = import_ref HasExtraInterfaces//default, inst63 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.fd4: %F.assoc_type = import_ref HasExtraInterfaces//default, loc14_21, loaded [template = constants.%assoc0]
@@ -1822,6 +1877,9 @@ fn Test(c: HasExtraInterfaces.C(type)) {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/lookup/no_prelude/specific_args.carbon b/toolchain/check/testdata/impl/lookup/no_prelude/specific_args.carbon
index 60ff95baf065..9339080fa058 100644
--- a/toolchain/check/testdata/impl/lookup/no_prelude/specific_args.carbon
+++ b/toolchain/check/testdata/impl/lookup/no_prelude/specific_args.carbon
@@ -66,6 +66,7 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:   %assoc0: %F.assoc_type = assoc_entity element0, @I.%F.decl [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C: type = class_type @C, @C(%T) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %X: type = class_type @X [template]
@@ -127,12 +128,18 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(@I.%T.loc4_13.1: type, @I.%Self.1: @I.%I.type (%I.type.325)) {
@@ -187,6 +194,7 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:   %import_ref.148 = import_ref Main//types, C, unloaded
 // CHECK:STDOUT:   %import_ref.686: type = import_ref Main//types, X, loaded [template = constants.%X]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//types, loc7_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.acf = import_ref Main//types, inst54 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.884 = import_ref Main//types, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.182 = import_ref Main//types, loc4_31, unloaded
 // CHECK:STDOUT:   %import_ref.87f: @I.%F.type (%F.type.2ae) = import_ref Main//types, F, loaded [symbolic = @I.%F (constants.%F.bb2)]
@@ -242,10 +250,16 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT: class @InInterfaceArgs {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%InInterfaceArgs
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X [from "types.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.acf
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(constants.%T: type, constants.%Self: %I.type.325) [from "types.carbon"] {
@@ -319,11 +333,13 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:   %import_ref.686: type = import_ref Main//types, X, loaded [template = constants.%X]
 // CHECK:STDOUT:   %import_ref.33d: type = import_ref Main//impl_in_interface_args, InInterfaceArgs, loaded [template = constants.%InInterfaceArgs]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//types, loc7_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.acf = import_ref Main//types, inst54 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.884 = import_ref Main//types, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.4ed: @I.%F.assoc_type (%F.assoc_type.003) = import_ref Main//types, loc4_31, loaded [symbolic = @I.%assoc0 (constants.%assoc0.ed59f4.2)]
 // CHECK:STDOUT:   %import_ref.e3f = import_ref Main//types, F, unloaded
 // CHECK:STDOUT:   %import_ref.479b0f.1 = import_ref Main//types, loc4_31, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//impl_in_interface_args, loc5_24, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.bf8 = import_ref Main//impl_in_interface_args, inst18 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.f9f: <witness> = import_ref Main//impl_in_interface_args, loc7_30, loaded [template = constants.%impl_witness]
 // CHECK:STDOUT:   %import_ref.956: type = import_ref Main//impl_in_interface_args, loc7_6, loaded [template = constants.%X]
 // CHECK:STDOUT:   %import_ref.e8c: type = import_ref Main//impl_in_interface_args, loc7_28, loaded [template = constants.%I.type.e45]
@@ -375,10 +391,16 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X [from "types.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.acf
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @InInterfaceArgs [from "impl_in_interface_args.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.bf8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G(%x.param_patt: %X) {
@@ -459,11 +481,13 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:   %import_ref.bb9: %C.type = import_ref Main//types, C, loaded [template = constants.%C.generic]
 // CHECK:STDOUT:   %import_ref.686: type = import_ref Main//types, X, loaded [template = constants.%X]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//types, loc5_20, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref Main//types, inst49 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.884 = import_ref Main//types, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.182 = import_ref Main//types, loc4_31, unloaded
 // CHECK:STDOUT:   %import_ref.87f: @I.%F.type (%F.type.2ae) = import_ref Main//types, F, loaded [symbolic = @I.%F (constants.%F.bb2)]
 // CHECK:STDOUT:   %import_ref.479 = import_ref Main//types, loc4_31, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//types, loc7_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.acf = import_ref Main//types, inst54 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -517,6 +541,9 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT: class @InClassArgs {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%InClassArgs
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @C(constants.%T: type) [from "types.carbon"] {
@@ -527,11 +554,17 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X [from "types.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.acf
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(constants.%T: type, constants.%Self: %I.type.325) [from "types.carbon"] {
@@ -618,12 +651,15 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:   %import_ref.686: type = import_ref Main//types, X, loaded [template = constants.%X]
 // CHECK:STDOUT:   %import_ref.4a9: type = import_ref Main//impl_in_class_args, InClassArgs, loaded [template = constants.%InClassArgs]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//types, loc5_20, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref Main//types, inst49 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//impl_in_class_args, loc5_20, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.683 = import_ref Main//impl_in_class_args, inst18 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.884 = import_ref Main//types, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.4ed: @I.%F.assoc_type (%F.assoc_type.003) = import_ref Main//types, loc4_31, loaded [symbolic = @I.%assoc0 (constants.%assoc0.ed59f4.2)]
 // CHECK:STDOUT:   %import_ref.e3f = import_ref Main//types, F, unloaded
 // CHECK:STDOUT:   %import_ref.479b0f.1 = import_ref Main//types, loc4_31, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.3: <witness> = import_ref Main//types, loc7_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.acf = import_ref Main//types, inst54 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.6de: <witness> = import_ref Main//impl_in_class_args, loc7_29, loaded [template = constants.%impl_witness]
 // CHECK:STDOUT:   %import_ref.d6e: type = import_ref Main//impl_in_class_args, loc7_19, loaded [template = constants.%C.23b]
 // CHECK:STDOUT:   %import_ref.208: type = import_ref Main//impl_in_class_args, loc7_27, loaded [template = constants.%I.type.45c]
@@ -685,15 +721,24 @@ fn H(c: C(InClassArgs)) { c.(I(X).F)(); }
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @InClassArgs [from "impl_in_class_args.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.683
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X [from "types.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.acf
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @H(%c.param_patt: %C.23b) {
diff --git a/toolchain/check/testdata/impl/lookup/transitive.carbon b/toolchain/check/testdata/impl/lookup/transitive.carbon
index f6fffa1dcc89..ee3edead2abc 100644
--- a/toolchain/check/testdata/impl/lookup/transitive.carbon
+++ b/toolchain/check/testdata/impl/lookup/transitive.carbon
@@ -149,6 +149,9 @@ fn Call() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(constants.%Self: %I.type) [from "i.carbon"] {
@@ -182,6 +185,7 @@ fn Call() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//c, loc6_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//c, inst18 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -204,6 +208,9 @@ fn Call() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "c.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Get() -> %C;
@@ -237,6 +244,7 @@ fn Call() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Main//get, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//get, inst22 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.e5d = import_ref Main//i, inst17 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.b5b: %F.assoc_type = import_ref Main//i, loc4_21, loaded [template = constants.%assoc0]
 // CHECK:STDOUT:   %import_ref.8b9 = import_ref Main//i, F, unloaded
@@ -271,6 +279,9 @@ fn Call() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "get.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Call() {
diff --git a/toolchain/check/testdata/impl/multiple_extend.carbon b/toolchain/check/testdata/impl/multiple_extend.carbon
index f3eb6832b26b..34c0384e4b85 100644
--- a/toolchain/check/testdata/impl/multiple_extend.carbon
+++ b/toolchain/check/testdata/impl/multiple_extend.carbon
@@ -271,6 +271,11 @@ fn P(o: O) {
 // CHECK:STDOUT:   %impl_witness.loc16: <witness> = impl_witness (@impl.2.%G.decl) [template = constants.%impl_witness.42a]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.1.%HasF.ref
+// CHECK:STDOUT:   extend @impl.2.%HasG.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@HasF.%Self: %HasF.type) {
@@ -432,6 +437,11 @@ fn P(o: O) {
 // CHECK:STDOUT:   %impl_witness.loc16: <witness> = impl_witness (@impl.2.%A.decl) [template = constants.%impl_witness.baf]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   extend @impl.1.%HasA1.ref
+// CHECK:STDOUT:   extend @impl.2.%HasA2.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @A.1(@HasA1.%Self: %HasA1.type) {
@@ -550,6 +560,10 @@ fn P(o: O) {
 // CHECK:STDOUT:   %J.decl: %J.type = fn_decl @J [template = constants.%J] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
+// CHECK:STDOUT:   .J = %J.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @E {
@@ -562,6 +576,12 @@ fn P(o: O) {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%I.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.0ff [template = constants.%complete_type.98e]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%E
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   extend %B.ref
+// CHECK:STDOUT:   extend @impl.%HasI.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @I.1(@HasI.%Self: %HasI.type) {
@@ -680,6 +700,10 @@ fn P(o: O) {
 // CHECK:STDOUT:   %K.decl: %K.type.5a4 = fn_decl @K.1 [template = constants.%K.801] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Base
+// CHECK:STDOUT:   .K = %K.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @L {
@@ -692,6 +716,12 @@ fn P(o: O) {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%K.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.b1e [template = constants.%complete_type.15c]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%L
+// CHECK:STDOUT:   .base = %.loc13
+// CHECK:STDOUT:   extend %Base.ref
+// CHECK:STDOUT:   extend @impl.%HasK.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @K.1() {
@@ -834,6 +864,10 @@ fn P(o: O) {
 // CHECK:STDOUT:   %N.decl: %N.type.fbf = fn_decl @N.1 [template = constants.%N.897] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NBase
+// CHECK:STDOUT:   .N = %N.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @O {
@@ -852,6 +886,14 @@ fn P(o: O) {
 // CHECK:STDOUT:   %N.decl: %N.type.8b4 = fn_decl @N.6 [template = constants.%N.cc3] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.base.9c6 [template = constants.%complete_type.121]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%O
+// CHECK:STDOUT:   .base = %.loc17
+// CHECK:STDOUT:   .N = %N.decl
+// CHECK:STDOUT:   extend %NBase.ref
+// CHECK:STDOUT:   extend @impl.1.%HasN1.ref
+// CHECK:STDOUT:   extend @impl.2.%HasN2.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @N.1() {
diff --git a/toolchain/check/testdata/impl/no_prelude/basic.carbon b/toolchain/check/testdata/impl/no_prelude/basic.carbon
index 7466d93fa76f..d590329f79ee 100644
--- a/toolchain/check/testdata/impl/no_prelude/basic.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/basic.carbon
@@ -72,6 +72,9 @@ impl C as Simple {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@Simple.%Self: %Simple.type) {
diff --git a/toolchain/check/testdata/impl/no_prelude/error_recovery.carbon b/toolchain/check/testdata/impl/no_prelude/error_recovery.carbon
index 4c0a7ec1a95c..ee1e77d0aaff 100644
--- a/toolchain/check/testdata/impl/no_prelude/error_recovery.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/error_recovery.carbon
@@ -60,5 +60,8 @@ impl forall [T: type] C as I { }
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/no_prelude/fail_alias.carbon b/toolchain/check/testdata/impl/no_prelude/fail_alias.carbon
index 3b81f9d77810..5eb00681c7a9 100644
--- a/toolchain/check/testdata/impl/no_prelude/fail_alias.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/fail_alias.carbon
@@ -82,5 +82,8 @@ impl AC as AI {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/no_prelude/fail_undefined_interface.carbon b/toolchain/check/testdata/impl/no_prelude/fail_undefined_interface.carbon
index 585bf45f1edf..53ad869fe142 100644
--- a/toolchain/check/testdata/impl/no_prelude/fail_undefined_interface.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/fail_undefined_interface.carbon
@@ -95,5 +95,8 @@ impl C as J {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/no_prelude/import_builtin_call.carbon b/toolchain/check/testdata/impl/no_prelude/import_builtin_call.carbon
index 785e4b17a0fa..286d49653dab 100644
--- a/toolchain/check/testdata/impl/no_prelude/import_builtin_call.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/import_builtin_call.carbon
@@ -295,6 +295,9 @@ var n: Int(64) = MakeFromClass(FromLiteral(64) as OtherInt);
 // CHECK:STDOUT:     adapt_decl %.loc12_15.2 [template]
 // CHECK:STDOUT:     %complete_type.loc13_1.1: <witness> = complete_type_witness %iN.builtin [symbolic = %complete_type.loc13_1.2 (constants.%complete_type)]
 // CHECK:STDOUT:     complete_type_witness = %complete_type.loc13_1.1
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%MyInt
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -444,6 +447,7 @@ var n: Int(64) = MakeFromClass(FromLiteral(64) as OtherInt);
 // CHECK:STDOUT:   %import_ref.370: %MyInt.type = import_ref Main//generic_impl, MyInt, loaded [template = constants.%MyInt.generic]
 // CHECK:STDOUT:   %import_ref.1a7: %Double.type = import_ref Main//generic_impl, Double, loaded [template = constants.%Double]
 // CHECK:STDOUT:   %import_ref.9e9: <witness> = import_ref Main//generic_impl, loc13_1, loaded [symbolic = @MyInt.%complete_type (constants.%complete_type.a87)]
+// CHECK:STDOUT:   %import_ref.697 = import_ref Main//generic_impl, inst89 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.07c = import_ref Main//generic_impl, inst15 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.6d9: %Op.assoc_type = import_ref Main//generic_impl, loc5_41, loaded [template = constants.%assoc0]
 // CHECK:STDOUT:   %import_ref.044 = import_ref Main//generic_impl, Op, unloaded
@@ -539,6 +543,9 @@ var n: Int(64) = MakeFromClass(FromLiteral(64) as OtherInt);
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.9e9
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.697
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -894,6 +901,10 @@ var n: Int(64) = MakeFromClass(FromLiteral(64) as OtherInt);
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %i32.builtin [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%OtherInt
+// CHECK:STDOUT:   .ToLiteral = %ToLiteral.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @IntLiteral() -> type = "int_literal.make_type";
@@ -1028,6 +1039,8 @@ var n: Int(64) = MakeFromClass(FromLiteral(64) as OtherInt);
 // CHECK:STDOUT:   %import_ref.466: type = import_ref Main//convert_symbolic, OtherInt, loaded [template = constants.%OtherInt]
 // CHECK:STDOUT:   %import_ref.10c: %MakeFromClass.type = import_ref Main//convert_symbolic, MakeFromClass, loaded [template = constants.%MakeFromClass]
 // CHECK:STDOUT:   %import_ref.b03: <witness> = import_ref Main//convert_symbolic, loc14_1, loaded [template = constants.%complete_type.f8a]
+// CHECK:STDOUT:   %import_ref.d11 = import_ref Main//convert_symbolic, inst129 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.8f7 = import_ref Main//convert_symbolic, loc13_45, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -1073,6 +1086,10 @@ var n: Int(64) = MakeFromClass(FromLiteral(64) as OtherInt);
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @OtherInt [from "convert_symbolic.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.b03
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.d11
+// CHECK:STDOUT:   .ToLiteral = imports.%import_ref.8f7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Int(%n.param_patt: Core.IntLiteral) -> type = "int.make_type_signed" [from "convert_symbolic.carbon"];
diff --git a/toolchain/check/testdata/impl/no_prelude/import_extend_impl.carbon b/toolchain/check/testdata/impl/no_prelude/import_extend_impl.carbon
index 73348105bf2c..5d134d406381 100644
--- a/toolchain/check/testdata/impl/no_prelude/import_extend_impl.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/import_extend_impl.carbon
@@ -87,6 +87,10 @@ fn G(c: C) {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   extend @impl.%I.ref
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
@@ -126,6 +130,8 @@ fn G(c: C) {
 // CHECK:STDOUT:   %import_ref.541 = import_ref Main//extend_impl_library, I, unloaded
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//extend_impl_library, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//extend_impl_library, loc12_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//extend_impl_library, inst25 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.3019d1.1: type = import_ref Main//extend_impl_library, loc9_18, loaded [template = constants.%I.type]
 // CHECK:STDOUT:   %import_ref.e5d = import_ref Main//extend_impl_library, inst15 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.b5b: %F.assoc_type = import_ref Main//extend_impl_library, loc5_9, loaded [template = constants.%assoc0]
 // CHECK:STDOUT:   %import_ref.8b9 = import_ref Main//extend_impl_library, F, unloaded
@@ -165,6 +171,10 @@ fn G(c: C) {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "extend_impl_library.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   extend imports.%import_ref.3019d1.1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G(%c.param_patt: %C) {
diff --git a/toolchain/check/testdata/impl/no_prelude/import_generic.carbon b/toolchain/check/testdata/impl/no_prelude/import_generic.carbon
index b00d44131ed2..8c548c6793ca 100644
--- a/toolchain/check/testdata/impl/no_prelude/import_generic.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/import_generic.carbon
@@ -219,6 +219,9 @@ impl forall [T:! type] D as J(T*) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @I(constants.%T) {
@@ -296,6 +299,7 @@ impl forall [T:! type] D as J(T*) {}
 // CHECK:STDOUT:   %import_ref.003 = import_ref Main//import_generic, loc8_33, unloaded
 // CHECK:STDOUT:   %import_ref.884 = import_ref Main//import_generic, inst31 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//import_generic, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//import_generic, inst14 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.29aca8.1: type = import_ref Main//import_generic, loc8_24, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.4be: type = import_ref Main//import_generic, loc8_32, loaded [symbolic = @impl.1.%I.type (constants.%I.type.325)]
 // CHECK:STDOUT:   %import_ref.4e1 = import_ref Main//import_generic, loc12_35, unloaded
@@ -462,6 +466,9 @@ impl forall [T:! type] D as J(T*) {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "import_generic.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @I(constants.%T) {
@@ -660,6 +667,9 @@ impl forall [T:! type] D as J(T*) {}
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @J(constants.%T) {
@@ -736,6 +746,7 @@ impl forall [T:! type] D as J(T*) {}
 // CHECK:STDOUT:   %import_ref.0eb: %J.type.2b8 = import_ref Main//import_generic_decl, J, loaded [template = constants.%J.generic]
 // CHECK:STDOUT:   %import_ref.ff5 = import_ref Main//import_generic_decl, inst31 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//import_generic_decl, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.cab = import_ref Main//import_generic_decl, inst14 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.aa9f8a.1: type = import_ref Main//import_generic_decl, loc11_24, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.ded: type = import_ref Main//import_generic_decl, loc11_32, loaded [symbolic = @impl.1.%J.type (constants.%J.type.b72)]
 // CHECK:STDOUT:   %import_ref.aa9f8a.2: type = import_ref Main//import_generic_decl, loc17_24, loaded [template = constants.%D]
@@ -891,6 +902,9 @@ impl forall [T:! type] D as J(T*) {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "fail_import_generic_decl.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @J(constants.%T) {
diff --git a/toolchain/check/testdata/impl/no_prelude/import_interface_assoc_const.carbon b/toolchain/check/testdata/impl/no_prelude/import_interface_assoc_const.carbon
index 14b1cc699c5b..a8afdc7df5f2 100644
--- a/toolchain/check/testdata/impl/no_prelude/import_interface_assoc_const.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/import_interface_assoc_const.carbon
@@ -311,6 +311,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- redecl.carbon
@@ -393,6 +396,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- redecl_adds_rewrites.carbon
@@ -465,6 +471,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C3 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_mismatch.carbon
@@ -549,6 +558,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C4 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_mismatch_bad_value.carbon
@@ -666,6 +678,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C5 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C5
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_missing_on_definition.carbon
@@ -738,6 +753,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C6 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C6
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_two_different.carbon
@@ -814,6 +832,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C7 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_two_different_first_bad.carbon
@@ -886,6 +907,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C8 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_two_different_second_bad.carbon
@@ -957,6 +981,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @C9 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C9
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_two_different_both_bad.carbon
@@ -1027,6 +1054,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @CA {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%CA
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- repeated.carbon
@@ -1102,6 +1132,9 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @CB {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%CB
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- non-type.carbon
@@ -1177,5 +1210,8 @@ impl CC as NonType where .Y = {.a = {}} { }
 // CHECK:STDOUT: class @CC {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%CC
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/no_prelude/import_use_generic.carbon b/toolchain/check/testdata/impl/no_prelude/import_use_generic.carbon
index d84eec6d3b5c..f6c0f06cc7b0 100644
--- a/toolchain/check/testdata/impl/no_prelude/import_use_generic.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/import_use_generic.carbon
@@ -128,6 +128,9 @@ fn F() -> c.(I.F)() {}
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -205,6 +208,7 @@ fn F() -> c.(I.F)() {}
 // CHECK:STDOUT:   %import_ref.bb9: %C.type = import_ref Main//import_generic, C, loaded [template = constants.%C.generic]
 // CHECK:STDOUT:   %import_ref.df2: type = import_ref Main//import_generic, I, loaded [template = constants.%I.type]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//import_generic, loc4_20, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.4c0 = import_ref Main//import_generic, inst25 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.e5d = import_ref Main//import_generic, inst31 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.b5b: %F.assoc_type = import_ref Main//import_generic, loc7_9, loaded [template = constants.%assoc0]
 // CHECK:STDOUT:   %import_ref.8b9 = import_ref Main//import_generic, F, unloaded
@@ -283,6 +287,9 @@ fn F() -> c.(I.F)() {}
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.4c0
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/impl/no_prelude/interface_args.carbon b/toolchain/check/testdata/impl/no_prelude/interface_args.carbon
index 277dc4bab0ba..a379bf39e249 100644
--- a/toolchain/check/testdata/impl/no_prelude/interface_args.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/interface_args.carbon
@@ -181,16 +181,25 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Op.1(@Action.%T.loc4_18.1: type, @Action.%Self.1: @Action.%Action.type (%Action.type.cca)) {
@@ -279,10 +288,12 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:   %import_ref.bde = import_ref Main//action, F, unloaded
 // CHECK:STDOUT:   %import_ref.71c: <witness> = import_ref Main//action, loc12_21, loaded [template = constants.%impl_witness]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//action, loc9_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.54a = import_ref Main//action, inst46 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.ddc = import_ref Main//action, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.f86: @Action.%Op.assoc_type (%Op.assoc_type.2ba) = import_ref Main//action, loc5_10, loaded [symbolic = @Action.%assoc0 (constants.%assoc0.9b9b19.2)]
 // CHECK:STDOUT:   %import_ref.ae2 = import_ref Main//action, Op, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//action, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.da3 = import_ref Main//action, inst41 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.984: type = import_ref Main//action, loc12_6, loaded [template = constants.%A]
 // CHECK:STDOUT:   %import_ref.bb2: type = import_ref Main//action, loc12_19, loaded [template = constants.%Action.type.cb0]
 // CHECK:STDOUT:   %import_ref.7b5 = import_ref Main//action, loc13_11, unloaded
@@ -338,10 +349,16 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B [from "action.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.54a
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A [from "action.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.da3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Op.1(constants.%T: type, constants.%Self: %Action.type.cca) [from "action.carbon"] {
@@ -427,15 +444,18 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:   %import_ref.bde = import_ref Main//action, F, unloaded
 // CHECK:STDOUT:   %import_ref.7a1 = import_ref Main//action, loc12_21, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//action, loc9_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.54a = import_ref Main//action, inst46 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.ddc = import_ref Main//action, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.f86: @Action.%Op.assoc_type (%Op.assoc_type.2ba) = import_ref Main//action, loc5_10, loaded [symbolic = @Action.%assoc0 (constants.%assoc0.9b9b19.2)]
 // CHECK:STDOUT:   %import_ref.ae2 = import_ref Main//action, Op, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//action, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.da3 = import_ref Main//action, inst41 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.984: type = import_ref Main//action, loc12_6, loaded [template = constants.%A]
 // CHECK:STDOUT:   %import_ref.bb2: type = import_ref Main//action, loc12_19, loaded [template = constants.%Action.type.cb0]
 // CHECK:STDOUT:   %import_ref.7b5 = import_ref Main//action, loc13_11, unloaded
 // CHECK:STDOUT:   %import_ref.0e3753.1 = import_ref Main//action, loc5_10, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.3: <witness> = import_ref Main//action, loc10_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//action, inst49 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -487,14 +507,23 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B [from "action.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.54a
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A [from "action.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.da3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "action.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Op(constants.%T: type, constants.%Self: %Action.type.cca) [from "action.carbon"] {
@@ -649,11 +678,17 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Make.1(@Factory.%T.loc4_19.1: type, @Factory.%Self.1: @Factory.%Factory.type (%Factory.type.c96)) {
@@ -728,10 +763,12 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:   %import_ref.dd8: type = import_ref Main//factory, B, loaded [template = constants.%B]
 // CHECK:STDOUT:   %import_ref.72b: <witness> = import_ref Main//factory, loc11_22, loaded [template = constants.%impl_witness]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//factory, loc9_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.54a = import_ref Main//factory, inst52 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.fbb = import_ref Main//factory, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.b0a: @Factory.%Make.assoc_type (%Make.assoc_type.4d9) = import_ref Main//factory, loc5_17, loaded [symbolic = @Factory.%assoc0 (constants.%assoc0.9270f3.2)]
 // CHECK:STDOUT:   %import_ref.c20 = import_ref Main//factory, Make, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//factory, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.da3 = import_ref Main//factory, inst47 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.984: type = import_ref Main//factory, loc11_6, loaded [template = constants.%A]
 // CHECK:STDOUT:   %import_ref.bd2: type = import_ref Main//factory, loc11_20, loaded [template = constants.%Factory.type.a5d]
 // CHECK:STDOUT:   %import_ref.a27 = import_ref Main//factory, loc12_17, unloaded
@@ -790,10 +827,16 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B [from "factory.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.54a
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A [from "factory.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.da3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Make.1(constants.%T: type, constants.%Self: %Factory.type.c96) [from "factory.carbon"] {
@@ -881,10 +924,12 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:   %import_ref.81b = import_ref Main//factory, B, unloaded
 // CHECK:STDOUT:   %import_ref.3e9 = import_ref Main//factory, loc11_22, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//factory, loc9_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.54a = import_ref Main//factory, inst52 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.fbb = import_ref Main//factory, inst26 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.b0a: @Factory.%Make.assoc_type (%Make.assoc_type.4d9) = import_ref Main//factory, loc5_17, loaded [symbolic = @Factory.%assoc0 (constants.%assoc0.9270f3.2)]
 // CHECK:STDOUT:   %import_ref.c20 = import_ref Main//factory, Make, unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//factory, loc8_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.da3 = import_ref Main//factory, inst47 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.984: type = import_ref Main//factory, loc11_6, loaded [template = constants.%A]
 // CHECK:STDOUT:   %import_ref.bd2: type = import_ref Main//factory, loc11_20, loaded [template = constants.%Factory.type.a5d]
 // CHECK:STDOUT:   %import_ref.a27 = import_ref Main//factory, loc12_17, unloaded
@@ -945,15 +990,24 @@ fn MakeC(a: A) -> C {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B [from "factory.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.54a
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A [from "factory.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.da3
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Make(constants.%T: type, constants.%Self: %Factory.type.c96) [from "factory.carbon"] {
diff --git a/toolchain/check/testdata/impl/no_prelude/self_in_class.carbon b/toolchain/check/testdata/impl/no_prelude/self_in_class.carbon
index 49d7b4aeaec7..91dcee839377 100644
--- a/toolchain/check/testdata/impl/no_prelude/self_in_class.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/self_in_class.carbon
@@ -92,6 +92,9 @@ class A {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A {
@@ -102,6 +105,9 @@ class A {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%Make.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Make.1(@DefaultConstructible.%Self: %DefaultConstructible.type) {
diff --git a/toolchain/check/testdata/impl/no_prelude/self_in_signature.carbon b/toolchain/check/testdata/impl/no_prelude/self_in_signature.carbon
index 0a8abda5c80b..bdcf0480443d 100644
--- a/toolchain/check/testdata/impl/no_prelude/self_in_signature.carbon
+++ b/toolchain/check/testdata/impl/no_prelude/self_in_signature.carbon
@@ -291,11 +291,17 @@ impl D as SelfNested {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@UseSelf.%Self: %UseSelf.type) {
diff --git a/toolchain/check/testdata/impl/redeclaration.carbon b/toolchain/check/testdata/impl/redeclaration.carbon
index e35a2663683e..dc32e633855c 100644
--- a/toolchain/check/testdata/impl/redeclaration.carbon
+++ b/toolchain/check/testdata/impl/redeclaration.carbon
@@ -82,5 +82,8 @@ impl i32 as I {}
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/interface/fail_todo_define_default_fn_out_of_line.carbon b/toolchain/check/testdata/interface/fail_todo_define_default_fn_out_of_line.carbon
index c8c608ccf8ef..1a07750c9b6a 100644
--- a/toolchain/check/testdata/interface/fail_todo_define_default_fn_out_of_line.carbon
+++ b/toolchain/check/testdata/interface/fail_todo_define_default_fn_out_of_line.carbon
@@ -301,6 +301,10 @@ fn Interface.C.F[self: Self](U:! type, u: U) -> U { return u; }
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.7e5
+// CHECK:STDOUT:     .F = %F.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/interface/no_prelude/default_fn.carbon b/toolchain/check/testdata/interface/no_prelude/default_fn.carbon
index 710962050822..3349993f779f 100644
--- a/toolchain/check/testdata/interface/no_prelude/default_fn.carbon
+++ b/toolchain/check/testdata/interface/no_prelude/default_fn.carbon
@@ -78,6 +78,10 @@ class C {
 // CHECK:STDOUT:   %impl_witness: <witness> = impl_witness (@impl.%F.decl) [template = constants.%impl_witness]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .I = %I.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@I.%Self: %I.type) {
diff --git a/toolchain/check/testdata/interface/no_prelude/generic.carbon b/toolchain/check/testdata/interface/no_prelude/generic.carbon
index bc3e2953c23f..a12f26ffc74f 100644
--- a/toolchain/check/testdata/interface/no_prelude/generic.carbon
+++ b/toolchain/check/testdata/interface/no_prelude/generic.carbon
@@ -250,6 +250,9 @@ fn G(T:! Generic(B)) {
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
@@ -269,6 +272,9 @@ fn G(T:! Generic(B)) {
 // CHECK:STDOUT:   %impl_witness.loc15: <witness> = impl_witness (@impl.2.%F.decl) [template = constants.%impl_witness.49b]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(@WithAssocFn.%T.loc8_23.1: type, @WithAssocFn.%Self.1: @WithAssocFn.%WithAssocFn.type (%WithAssocFn.type.ce6)) {
@@ -462,11 +468,17 @@ fn G(T:! Generic(B)) {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%T.loc9_6.1: %Generic.type.c7c) {
diff --git a/toolchain/check/testdata/interface/no_prelude/generic_import.carbon b/toolchain/check/testdata/interface/no_prelude/generic_import.carbon
index cb555b497831..a75f90e43530 100644
--- a/toolchain/check/testdata/interface/no_prelude/generic_import.carbon
+++ b/toolchain/check/testdata/interface/no_prelude/generic_import.carbon
@@ -175,6 +175,9 @@ impl C as AddWith(C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F.1(constants.%T: type, constants.%Self: %AddWith.type.bc7) [from "a.carbon"] {
diff --git a/toolchain/check/testdata/interface/no_prelude/generic_vs_params.carbon b/toolchain/check/testdata/interface/no_prelude/generic_vs_params.carbon
index 959b55342d9c..59d4ac217d65 100644
--- a/toolchain/check/testdata/interface/no_prelude/generic_vs_params.carbon
+++ b/toolchain/check/testdata/interface/no_prelude/generic_vs_params.carbon
@@ -65,6 +65,7 @@ interface A(T: type) {}
 // CHECK:STDOUT:   %Self.2f4: %GenericAndParams.type.73e = bind_symbolic_name Self, 1 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.f2e: type = class_type @C, @C(%T) [symbolic]
 // CHECK:STDOUT:   %GenericNoParams.type.f90: type = facet_type <@GenericNoParams> [template]
 // CHECK:STDOUT:   %GenericNoParams.type.b79: type = facet_type <@GenericNoParams, @GenericNoParams(%T)> [symbolic]
 // CHECK:STDOUT:   %Self.0f6: %GenericNoParams.type.b79 = bind_symbolic_name Self, 1 [symbolic]
@@ -259,12 +260,20 @@ interface A(T: type) {}
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.f2e
+// CHECK:STDOUT:     .GenericNoParams = %GenericNoParams.decl
+// CHECK:STDOUT:     .GenericAndParams = %GenericAndParams.decl
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @GenericAndParams.1(constants.%T) {
diff --git a/toolchain/check/testdata/interface/no_prelude/syntactic_merge.carbon b/toolchain/check/testdata/interface/no_prelude/syntactic_merge.carbon
index 1c609cb75ffa..710cc796cbdd 100644
--- a/toolchain/check/testdata/interface/no_prelude/syntactic_merge.carbon
+++ b/toolchain/check/testdata/interface/no_prelude/syntactic_merge.carbon
@@ -285,6 +285,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -359,6 +362,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -435,6 +441,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -507,6 +516,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -575,6 +587,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -615,6 +630,7 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT:   %import_ref.c61: %Foo.type = import_ref Main//two_file, Foo, loaded [template = constants.%Foo.generic]
 // CHECK:STDOUT:   %import_ref.feb: %Bar.type = import_ref Main//two_file, Bar, loaded [template = constants.%Bar.generic]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//two_file, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//two_file, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -694,6 +710,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "two_file.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -792,6 +811,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -876,6 +898,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -960,6 +985,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -1012,6 +1040,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -1039,6 +1070,7 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//alias_two_file, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.c61: %Foo.type = import_ref Main//alias_two_file, Foo, loaded [template = constants.%Foo.generic]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//alias_two_file, loc4_10, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//alias_two_file, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -1087,6 +1119,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "alias_two_file.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
@@ -1176,6 +1211,9 @@ interface Foo(a:! const (const C)) {}
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Foo(constants.%a) {
diff --git a/toolchain/check/testdata/let/compile_time_bindings.carbon b/toolchain/check/testdata/let/compile_time_bindings.carbon
index db90c4062ed6..5804abfddb9b 100644
--- a/toolchain/check/testdata/let/compile_time_bindings.carbon
+++ b/toolchain/check/testdata/let/compile_time_bindings.carbon
@@ -214,6 +214,11 @@ impl i32 as Empty {
 // CHECK:STDOUT:   %x: %empty_tuple.type = bind_name x, %.loc10_17.2
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .x = %x
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %empty_tuple.type {
@@ -273,6 +278,11 @@ impl i32 as Empty {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .x = %x
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %empty_tuple.type {
@@ -375,6 +385,12 @@ impl i32 as Empty {
 // CHECK:STDOUT:   %d: %tuple.type.2d5 = bind_name d, %.loc22_37.5
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .a = %a
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .d = %d
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @F(%b.loc10_8.2: %tuple.type.9fb) {
@@ -554,6 +570,11 @@ impl i32 as Empty {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
+// CHECK:STDOUT:   .x = <unexpected>.inst29.loc14_7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %empty_tuple.type {
@@ -823,6 +844,11 @@ impl i32 as Empty {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%I
+// CHECK:STDOUT:   .T = %T
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> <error>;
diff --git a/toolchain/check/testdata/namespace/fail_not_top_level.carbon b/toolchain/check/testdata/namespace/fail_not_top_level.carbon
index 98ec03b5da0e..43b965fd3048 100644
--- a/toolchain/check/testdata/namespace/fail_not_top_level.carbon
+++ b/toolchain/check/testdata/namespace/fail_not_top_level.carbon
@@ -93,6 +93,10 @@ interface I {
 // CHECK:STDOUT:   %F.decl: %F.type.1cc = fn_decl @F.3 [template = constants.%F.f49] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .N = %N
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F.1() {
diff --git a/toolchain/check/testdata/namespace/merging_with_indirections.carbon b/toolchain/check/testdata/namespace/merging_with_indirections.carbon
index 28744f41d99f..7334315a1480 100644
--- a/toolchain/check/testdata/namespace/merging_with_indirections.carbon
+++ b/toolchain/check/testdata/namespace/merging_with_indirections.carbon
@@ -71,6 +71,9 @@ fn Run() {
 // CHECK:STDOUT: class @A {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- b.carbon
@@ -97,6 +100,7 @@ fn Run() {
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Other//a, loc5_14, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.ca8 = import_ref Other//a, inst17 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -126,10 +130,16 @@ fn Run() {
 // CHECK:STDOUT: class @B {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%B
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.ca8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %return.param_patt: %A {
@@ -165,6 +175,7 @@ fn Run() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.f04: %F.type = import_ref Other//b, F, loaded [template = constants.%F]
 // CHECK:STDOUT:   %import_ref.8db: <witness> = import_ref Other//b, inst28 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.bbd = import_ref Other//b, inst29 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.a85: <namespace> = import_ref Other//b, NS1, loaded
 // CHECK:STDOUT:   %NS1: <namespace> = namespace %import_ref.a85, [template] {
 // CHECK:STDOUT:     .A = %import_ref.257
@@ -187,6 +198,9 @@ fn Run() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @A [from "b.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8db
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.bbd
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Run() {
diff --git a/toolchain/check/testdata/operators/overloaded/add.carbon b/toolchain/check/testdata/operators/overloaded/add.carbon
index 19ff68899396..9e2ceb3ef524 100644
--- a/toolchain/check/testdata/operators/overloaded/add.carbon
+++ b/toolchain/check/testdata/operators/overloaded/add.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/bit_and.carbon b/toolchain/check/testdata/operators/overloaded/bit_and.carbon
index 8e2319f68030..bbd86f1943b9 100644
--- a/toolchain/check/testdata/operators/overloaded/bit_and.carbon
+++ b/toolchain/check/testdata/operators/overloaded/bit_and.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/bit_complement.carbon b/toolchain/check/testdata/operators/overloaded/bit_complement.carbon
index 929f4e5f7f43..c0e579bda95d 100644
--- a/toolchain/check/testdata/operators/overloaded/bit_complement.carbon
+++ b/toolchain/check/testdata/operators/overloaded/bit_complement.carbon
@@ -101,6 +101,9 @@ fn TestOp(a: C) -> C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C]() -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/bit_or.carbon b/toolchain/check/testdata/operators/overloaded/bit_or.carbon
index da19c2df14cc..17d162d4abb5 100644
--- a/toolchain/check/testdata/operators/overloaded/bit_or.carbon
+++ b/toolchain/check/testdata/operators/overloaded/bit_or.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/bit_xor.carbon b/toolchain/check/testdata/operators/overloaded/bit_xor.carbon
index 06603c5c45be..1d7815127abf 100644
--- a/toolchain/check/testdata/operators/overloaded/bit_xor.carbon
+++ b/toolchain/check/testdata/operators/overloaded/bit_xor.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/dec.carbon b/toolchain/check/testdata/operators/overloaded/dec.carbon
index 81f31f640da4..0884a448c1c0 100644
--- a/toolchain/check/testdata/operators/overloaded/dec.carbon
+++ b/toolchain/check/testdata/operators/overloaded/dec.carbon
@@ -89,6 +89,9 @@ fn TestOp() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[addr %self.param_patt: %ptr.019]();
diff --git a/toolchain/check/testdata/operators/overloaded/div.carbon b/toolchain/check/testdata/operators/overloaded/div.carbon
index 0aa8987c9abb..2e20f873226f 100644
--- a/toolchain/check/testdata/operators/overloaded/div.carbon
+++ b/toolchain/check/testdata/operators/overloaded/div.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/eq.carbon b/toolchain/check/testdata/operators/overloaded/eq.carbon
index e32385723dcb..2ca2706bc8ca 100644
--- a/toolchain/check/testdata/operators/overloaded/eq.carbon
+++ b/toolchain/check/testdata/operators/overloaded/eq.carbon
@@ -223,6 +223,9 @@ fn TestLhsBad(a: D, b: C) -> bool {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Equal.2[%self.param_patt: %C](%other.param_patt: %C) -> bool;
@@ -330,6 +333,9 @@ fn TestLhsBad(a: D, b: C) -> bool {
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestEqual(%a.param_patt: %D, %b.param_patt: %D) -> bool {
@@ -489,11 +495,17 @@ fn TestLhsBad(a: D, b: C) -> bool {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Equal.2[%self.param_patt: %C](%other.param_patt: %C) -> bool;
diff --git a/toolchain/check/testdata/operators/overloaded/fail_assign_non_ref.carbon b/toolchain/check/testdata/operators/overloaded/fail_assign_non_ref.carbon
index aca915ded687..c33481ba2866 100644
--- a/toolchain/check/testdata/operators/overloaded/fail_assign_non_ref.carbon
+++ b/toolchain/check/testdata/operators/overloaded/fail_assign_non_ref.carbon
@@ -166,6 +166,9 @@ fn TestAddAssignNonRef(a: C, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[addr %self.param_patt: %ptr.019]();
diff --git a/toolchain/check/testdata/operators/overloaded/fail_no_impl.carbon b/toolchain/check/testdata/operators/overloaded/fail_no_impl.carbon
index f4e6084620b2..92a708395aad 100644
--- a/toolchain/check/testdata/operators/overloaded/fail_no_impl.carbon
+++ b/toolchain/check/testdata/operators/overloaded/fail_no_impl.carbon
@@ -122,6 +122,9 @@ fn TestRef(b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestUnary(%a.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/fail_no_impl_for_arg.carbon b/toolchain/check/testdata/operators/overloaded/fail_no_impl_for_arg.carbon
index 1b754b53c7a1..f2800e314c41 100644
--- a/toolchain/check/testdata/operators/overloaded/fail_no_impl_for_arg.carbon
+++ b/toolchain/check/testdata/operators/overloaded/fail_no_impl_for_arg.carbon
@@ -190,11 +190,17 @@ fn TestAssign(b: D) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %C;
diff --git a/toolchain/check/testdata/operators/overloaded/implicit_as.carbon b/toolchain/check/testdata/operators/overloaded/implicit_as.carbon
index bddc7555a707..58e26a58977f 100644
--- a/toolchain/check/testdata/operators/overloaded/implicit_as.carbon
+++ b/toolchain/check/testdata/operators/overloaded/implicit_as.carbon
@@ -196,6 +196,10 @@ fn Test() {
 // CHECK:STDOUT:   %.var: ref %X.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type.54b]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
+// CHECK:STDOUT:   .n = %.loc12_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Convert.2[%self.param_patt: %i32]() -> %return.param_patt: %X {
diff --git a/toolchain/check/testdata/operators/overloaded/inc.carbon b/toolchain/check/testdata/operators/overloaded/inc.carbon
index 3c77ca730168..513bedeec654 100644
--- a/toolchain/check/testdata/operators/overloaded/inc.carbon
+++ b/toolchain/check/testdata/operators/overloaded/inc.carbon
@@ -89,6 +89,9 @@ fn TestOp() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[addr %self.param_patt: %ptr.019]();
diff --git a/toolchain/check/testdata/operators/overloaded/index.carbon b/toolchain/check/testdata/operators/overloaded/index.carbon
index 8a2acc484e7a..0925a7ec1b37 100644
--- a/toolchain/check/testdata/operators/overloaded/index.carbon
+++ b/toolchain/check/testdata/operators/overloaded/index.carbon
@@ -183,16 +183,25 @@ let x: i32 = c[0];
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ElementType {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%ElementType.e6b
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SubscriptType {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SubscriptType.8ee
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @At.2[%self.param_patt: %C](%subscript.param_patt: %SubscriptType.8ee) -> %return.param_patt: %ElementType.e6b {
@@ -477,16 +486,25 @@ let x: i32 = c[0];
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ElementType {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%ElementType.e6b
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @SubscriptType {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%SubscriptType.8ee
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @At.2[%self.param_patt: %C](%subscript.param_patt: %SubscriptType.8ee) -> %return.param_patt: %ElementType.e6b {
@@ -563,6 +581,9 @@ let x: i32 = c[0];
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/operators/overloaded/left_shift.carbon b/toolchain/check/testdata/operators/overloaded/left_shift.carbon
index 84842e8883cf..cdc509ee7903 100644
--- a/toolchain/check/testdata/operators/overloaded/left_shift.carbon
+++ b/toolchain/check/testdata/operators/overloaded/left_shift.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/mod.carbon b/toolchain/check/testdata/operators/overloaded/mod.carbon
index d31fcc3a706f..16021fcbbce1 100644
--- a/toolchain/check/testdata/operators/overloaded/mod.carbon
+++ b/toolchain/check/testdata/operators/overloaded/mod.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/mul.carbon b/toolchain/check/testdata/operators/overloaded/mul.carbon
index 0711df118483..adfd5b69b715 100644
--- a/toolchain/check/testdata/operators/overloaded/mul.carbon
+++ b/toolchain/check/testdata/operators/overloaded/mul.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/negate.carbon b/toolchain/check/testdata/operators/overloaded/negate.carbon
index 3af979b80254..4e0d31773bd4 100644
--- a/toolchain/check/testdata/operators/overloaded/negate.carbon
+++ b/toolchain/check/testdata/operators/overloaded/negate.carbon
@@ -101,6 +101,9 @@ fn TestOp(a: C) -> C {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C]() -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/no_prelude/index.carbon b/toolchain/check/testdata/operators/overloaded/no_prelude/index.carbon
index 730fbdf62c5a..fcc828cf1c01 100644
--- a/toolchain/check/testdata/operators/overloaded/no_prelude/index.carbon
+++ b/toolchain/check/testdata/operators/overloaded/no_prelude/index.carbon
@@ -78,6 +78,9 @@ fn F() { ()[()]; }
 // CHECK:STDOUT: class @IndexWith {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%IndexWith
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
diff --git a/toolchain/check/testdata/operators/overloaded/ordered.carbon b/toolchain/check/testdata/operators/overloaded/ordered.carbon
index 21eba8658196..82a68a357525 100644
--- a/toolchain/check/testdata/operators/overloaded/ordered.carbon
+++ b/toolchain/check/testdata/operators/overloaded/ordered.carbon
@@ -309,6 +309,9 @@ fn TestGreaterEqual(a: D, b: D) -> bool {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Less.2[%self.param_patt: %C](%other.param_patt: %C) -> bool;
@@ -490,6 +493,9 @@ fn TestGreaterEqual(a: D, b: D) -> bool {
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @TestLess(%a.param_patt: %D, %b.param_patt: %D) -> bool {
diff --git a/toolchain/check/testdata/operators/overloaded/right_shift.carbon b/toolchain/check/testdata/operators/overloaded/right_shift.carbon
index 122724639082..215a068b58fd 100644
--- a/toolchain/check/testdata/operators/overloaded/right_shift.carbon
+++ b/toolchain/check/testdata/operators/overloaded/right_shift.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/operators/overloaded/sub.carbon b/toolchain/check/testdata/operators/overloaded/sub.carbon
index ea9cba9852ce..d22cf586b456 100644
--- a/toolchain/check/testdata/operators/overloaded/sub.carbon
+++ b/toolchain/check/testdata/operators/overloaded/sub.carbon
@@ -176,6 +176,9 @@ fn TestAssign(a: C*, b: C) {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Op.2[%self.param_patt: %C](%other.param_patt: %C) -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/package_expr/syntax.carbon b/toolchain/check/testdata/package_expr/syntax.carbon
index f958b06e7c56..b110de5354c3 100644
--- a/toolchain/check/testdata/package_expr/syntax.carbon
+++ b/toolchain/check/testdata/package_expr/syntax.carbon
@@ -246,6 +246,10 @@ fn Main() {
 // CHECK:STDOUT:   %Foo.decl: %Foo.type = fn_decl @Foo [template = constants.%Foo] {} {}
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .Foo = %Foo.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Foo() {
diff --git a/toolchain/check/testdata/packages/no_prelude/cross_package_export.carbon b/toolchain/check/testdata/packages/no_prelude/cross_package_export.carbon
index 3594bd8c76b5..4c84486bdf8b 100644
--- a/toolchain/check/testdata/packages/no_prelude/cross_package_export.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/cross_package_export.carbon
@@ -217,6 +217,10 @@ alias C = Other.C;
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .x = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- conflict.carbon
@@ -289,6 +293,8 @@ alias C = Other.C;
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Other//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Other//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -301,6 +307,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_name_copy.carbon
@@ -315,6 +325,8 @@ alias C = Other.C;
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Other//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Other//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -327,6 +339,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_name_indirect.carbon
@@ -341,6 +357,8 @@ alias C = Other.C;
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Other//export_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Other//export_name, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Other//export_name, inst21 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Other//export_name, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -353,6 +371,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- use_export_import.carbon
@@ -374,6 +396,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Other//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Other//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -396,6 +420,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -431,6 +459,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Other//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Other//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -453,6 +483,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -488,6 +522,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Other//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Other//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Other//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Other//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -510,6 +546,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -543,6 +583,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Other//export_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Other//export_name, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Other//export_name, inst21 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Other//export_name, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -565,6 +607,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -599,6 +645,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Other//export_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Other//export_name, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Other//export_name, inst21 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Other//export_name, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -621,6 +669,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -654,6 +706,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.f43: type = import_ref Other//export_name_indirect, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.328: <witness> = import_ref Other//export_name_indirect, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.db8 = import_ref Other//export_name_indirect, inst21 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.3ef = import_ref Other//export_name_indirect, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -676,6 +730,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name_indirect.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.328
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.db8
+// CHECK:STDOUT:   .x = imports.%import_ref.3ef
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -715,6 +773,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Other//export_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Other//export_name, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Other//export_name, inst21 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Other//export_name, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -737,6 +797,10 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -832,6 +896,8 @@ alias C = Other.C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Other//export_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Other//export_name, inst20 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Other//export_name, inst21 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Other//export_name, inst22 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -847,5 +913,9 @@ alias C = Other.C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/packages/no_prelude/export_import.carbon b/toolchain/check/testdata/packages/no_prelude/export_import.carbon
index 3b41f8453368..f0be8b2558c6 100644
--- a/toolchain/check/testdata/packages/no_prelude/export_import.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/export_import.carbon
@@ -196,6 +196,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .x = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export.carbon
@@ -283,6 +287,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -302,6 +308,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -335,6 +345,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.f68: type = import_ref Main//export_export, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -355,6 +367,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -384,6 +400,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -403,6 +421,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -432,6 +454,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -451,6 +475,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -480,6 +508,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -499,6 +529,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -528,6 +562,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -547,6 +583,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -576,6 +616,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -595,6 +637,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -624,6 +670,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -643,6 +691,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -683,6 +735,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -702,6 +756,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -732,6 +790,8 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:   %import_ref.39e = import_ref Main//use_non_export_then_base, c, unloaded
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -752,6 +812,10 @@ var indirect_c: C = {.x = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/packages/no_prelude/export_mixed.carbon b/toolchain/check/testdata/packages/no_prelude/export_mixed.carbon
index 892f9add93f9..12445d363530 100644
--- a/toolchain/check/testdata/packages/no_prelude/export_mixed.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/export_mixed.carbon
@@ -145,6 +145,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type.9be]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .x = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
@@ -155,6 +159,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:   %.var: ref %D.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.y [template = constants.%complete_type.9f4]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .y = %.loc9_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_import.carbon
@@ -185,6 +193,8 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.e8f = import_ref Main//base, D, unloaded
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -198,6 +208,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_name.carbon
@@ -213,6 +227,8 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Main//base, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.e8f = import_ref Main//base, D, unloaded
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -226,6 +242,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_name_then_import.carbon
@@ -255,6 +275,8 @@ var d: D = {.y = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export_import_then_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export_import_then_name, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export_import_then_name, inst22 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export_import_then_name, inst23 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -274,6 +296,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_import_then_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -303,6 +329,8 @@ var d: D = {.y = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export_name, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export_name, inst22 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export_name, inst23 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -322,6 +350,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -351,6 +383,8 @@ var d: D = {.y = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export_import_then_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export_import_then_name, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export_import_then_name, inst22 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export_import_then_name, inst23 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -370,6 +404,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_import_then_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -433,6 +471,8 @@ var d: D = {.y = ()};
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export_import_then_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export_import_then_name, inst21 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export_import_then_name, inst22 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export_import_then_name, inst23 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -452,6 +492,10 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_import_then_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -486,7 +530,11 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//export_import_then_name, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.b0a: type = import_ref Main//base, D, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export_import_then_name, inst21 [indirect], loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export_import_then_name, inst22 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export_import_then_name, inst23 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.5ab: <witness> = import_ref Main//base, loc10_1, loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.cab = import_ref Main//base, inst27 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.950 = import_ref Main//base, loc9_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -515,10 +563,18 @@ var d: D = {.y = ()};
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_import_then_name.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.5ab
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
+// CHECK:STDOUT:   .y = imports.%import_ref.950
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/packages/no_prelude/export_name.carbon b/toolchain/check/testdata/packages/no_prelude/export_name.carbon
index 8be5f65af369..19c164cb2774 100644
--- a/toolchain/check/testdata/packages/no_prelude/export_name.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/export_name.carbon
@@ -235,6 +235,10 @@ private export C;
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.x [template = constants.%complete_type.9be]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .x = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC {
@@ -245,6 +249,10 @@ private export C;
 // CHECK:STDOUT:   %.var: ref %NSC.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.y [template = constants.%complete_type.9f4]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%NSC
+// CHECK:STDOUT:   .y = %.loc10_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export.carbon
@@ -267,7 +275,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.1a1: type = import_ref Main//base, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT:   %import_ref.5ab: <witness> = import_ref Main//base, loc11_1, loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.31c = import_ref Main//base, inst28 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.be6 = import_ref Main//base, loc10_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -282,10 +294,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.5ab
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.31c
+// CHECK:STDOUT:   .y = imports.%import_ref.be6
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- not_reexporting.carbon
@@ -326,7 +346,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.231: type = import_ref Main//export, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export, inst23 [indirect], loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export, inst24 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export, inst25 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.63c: <witness> = import_ref Main//export, inst31 [indirect], loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.f0b = import_ref Main//export, inst32 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.ebc = import_ref Main//export, inst33 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -341,10 +365,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.63c
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.f0b
+// CHECK:STDOUT:   .y = imports.%import_ref.ebc
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- export_in_impl.carbon
@@ -376,7 +408,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.231: type = import_ref Main//export, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export, inst23 [indirect], loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export, inst24 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export, inst25 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.63c: <witness> = import_ref Main//export, inst31 [indirect], loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.f0b = import_ref Main//export, inst32 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.ebc = import_ref Main//export, inst33 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -408,10 +444,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.63c
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.f0b
+// CHECK:STDOUT:   .y = imports.%import_ref.ebc
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -458,7 +502,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.bb8: type = import_ref Main//export_export, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.328: <witness> = import_ref Main//export_export, inst23 [indirect], loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.db8 = import_ref Main//export_export, inst24 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.3ef = import_ref Main//export_export, inst25 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.c12: <witness> = import_ref Main//export_export, inst31 [indirect], loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.1cb = import_ref Main//export_export, inst32 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.b18 = import_ref Main//export_export, inst33 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -491,10 +539,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.328
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.db8
+// CHECK:STDOUT:   .x = imports.%import_ref.3ef
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "export_export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.c12
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.1cb
+// CHECK:STDOUT:   .y = imports.%import_ref.b18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -541,7 +597,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.bb8: type = import_ref Main//export_export, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.328: <witness> = import_ref Main//export_export, inst23 [indirect], loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.db8 = import_ref Main//export_export, inst24 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.3ef = import_ref Main//export_export, inst25 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.c12: <witness> = import_ref Main//export_export, inst31 [indirect], loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.1cb = import_ref Main//export_export, inst32 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.b18 = import_ref Main//export_export, inst33 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -573,10 +633,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export_export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.328
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.db8
+// CHECK:STDOUT:   .x = imports.%import_ref.3ef
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "export_export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.c12
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.1cb
+// CHECK:STDOUT:   .y = imports.%import_ref.b18
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -636,6 +704,9 @@ private export C;
 // CHECK:STDOUT: class @Local {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Local
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_export_member.carbon
@@ -654,6 +725,8 @@ private export C;
 // CHECK:STDOUT:     .NSC = %import_ref.461
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -666,6 +739,10 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- import_both.carbon
@@ -691,7 +768,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.1a1: type = import_ref Main//base, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT:   %import_ref.5ab: <witness> = import_ref Main//base, loc11_1, loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.31c = import_ref Main//base, inst28 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.be6 = import_ref Main//base, loc10_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -723,10 +804,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.5ab
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.31c
+// CHECK:STDOUT:   .y = imports.%import_ref.be6
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -773,7 +862,11 @@ private export C;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.231: type = import_ref Main//export, NSC, loaded [template = constants.%NSC]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//export, inst23 [indirect], loaded [template = constants.%complete_type.9be]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//export, inst24 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//export, inst25 [indirect], unloaded
 // CHECK:STDOUT:   %import_ref.63c: <witness> = import_ref Main//export, inst31 [indirect], loaded [template = constants.%complete_type.9f4]
+// CHECK:STDOUT:   %import_ref.f0b = import_ref Main//export, inst32 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.ebc = import_ref Main//export, inst33 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -805,10 +898,18 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @NSC [from "export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.63c
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.f0b
+// CHECK:STDOUT:   .y = imports.%import_ref.ebc
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -863,6 +964,8 @@ private export C;
 // CHECK:STDOUT:     .NSC = %import_ref.461
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -876,6 +979,10 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- use_repeat_export.carbon
@@ -892,6 +999,8 @@ private export C;
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.06e: type = import_ref Main//repeat_export, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.ad3: <witness> = import_ref Main//repeat_export, inst23 [indirect], loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.6a9 = import_ref Main//repeat_export, inst24 [indirect], unloaded
+// CHECK:STDOUT:   %import_ref.f67 = import_ref Main//repeat_export, inst25 [indirect], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -911,6 +1020,10 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "repeat_export.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.ad3
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.6a9
+// CHECK:STDOUT:   .x = imports.%import_ref.f67
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -942,6 +1055,8 @@ private export C;
 // CHECK:STDOUT:     .NSC = %import_ref.461
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.56d: <witness> = import_ref Main//base, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Main//base, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.276 = import_ref Main//base, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -955,5 +1070,9 @@ private export C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "base.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.56d
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .x = imports.%import_ref.276
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/packages/no_prelude/fail_export_name_member.carbon b/toolchain/check/testdata/packages/no_prelude/fail_export_name_member.carbon
index 9c7dbe9e0d8e..cf8f05782c59 100644
--- a/toolchain/check/testdata/packages/no_prelude/fail_export_name_member.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/fail_export_name_member.carbon
@@ -59,6 +59,10 @@ export C.n;
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .n = %.loc5_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_b.carbon
@@ -73,6 +77,8 @@ export C.n;
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.3b0: type = import_ref Foo//a, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.9fc: <witness> = import_ref Foo//a, loc6_1, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2c4 = import_ref Foo//a, inst14 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.4cb = import_ref Foo//a, loc5_8, unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -84,5 +90,9 @@ export C.n;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "a.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.9fc
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2c4
+// CHECK:STDOUT:   .n = imports.%import_ref.4cb
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/packages/no_prelude/implicit_imports_entities.carbon b/toolchain/check/testdata/packages/no_prelude/implicit_imports_entities.carbon
index b0cd9ef45567..e2d1dd1ef351 100644
--- a/toolchain/check/testdata/packages/no_prelude/implicit_imports_entities.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/implicit_imports_entities.carbon
@@ -183,6 +183,9 @@ import Other library "o1";
 // CHECK:STDOUT: class @C1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- c2.carbon
@@ -203,6 +206,9 @@ import Other library "o1";
 // CHECK:STDOUT: class @C2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- ns.carbon
@@ -226,6 +232,9 @@ import Other library "o1";
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- o1.carbon
@@ -246,6 +255,9 @@ import Other library "o1";
 // CHECK:STDOUT: class @O1 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%O1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- o2.carbon
@@ -266,6 +278,9 @@ import Other library "o1";
 // CHECK:STDOUT: class @O2 {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%O2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- local_other.carbon
@@ -286,6 +301,9 @@ import Other library "o1";
 // CHECK:STDOUT: class @Other {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Other
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- mix_current_package.carbon
@@ -316,7 +334,9 @@ import Other library "o1";
 // CHECK:STDOUT:   %import_ref.0d9: type = import_ref Main//mix_current_package, C1, loaded [template = constants.%C1]
 // CHECK:STDOUT:   %import_ref.09c: type = import_ref Main//c2, C2, loaded [template = constants.%C2]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Main//c1, loc4_11, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.eb7 = import_ref Main//c1, inst14 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Main//c2, loc4_11, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.5b0 = import_ref Main//c2, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -346,10 +366,16 @@ import Other library "o1";
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C1 [from "c1.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.eb7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C2 [from "c2.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.5b0
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -390,6 +416,7 @@ import Other library "o1";
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %import_ref.0d9: type = import_ref Main//dup_c1, C1, loaded [template = constants.%C1]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//c1, loc4_11, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.eb7 = import_ref Main//c1, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -410,6 +437,9 @@ import Other library "o1";
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C1 [from "c1.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.eb7
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -453,6 +483,7 @@ import Other library "o1";
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.1c4: type = import_ref Main//use_ns, C, loaded [template = constants.%C]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Main//ns, loc5_13, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2dd = import_ref Main//ns, inst15 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -476,6 +507,9 @@ import Other library "o1";
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "ns.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2dd
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -522,8 +556,10 @@ import Other library "o1";
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.880: type = import_ref Other//o1, O1, loaded [template = constants.%O1]
 // CHECK:STDOUT:   %import_ref.8f24d3.1: <witness> = import_ref Other//o1, loc4_11, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.481 = import_ref Other//o1, inst14 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.328: type = import_ref Other//o2, O2, loaded [template = constants.%O2]
 // CHECK:STDOUT:   %import_ref.8f24d3.2: <witness> = import_ref Other//o2, loc4_11, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.2eb = import_ref Other//o2, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -559,10 +595,16 @@ import Other library "o1";
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @O1 [from "o1.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.1
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.481
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @O2 [from "o2.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.2eb
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
@@ -609,6 +651,7 @@ import Other library "o1";
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.880: type = import_ref Other//o1, O1, loaded [template = constants.%O1]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Other//o1, loc4_11, loaded [template = constants.%complete_type]
+// CHECK:STDOUT:   %import_ref.481 = import_ref Other//o1, inst14 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -633,6 +676,9 @@ import Other library "o1";
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @O1 [from "o1.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.481
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/check/testdata/packages/no_prelude/missing_prelude.carbon b/toolchain/check/testdata/packages/no_prelude/missing_prelude.carbon
index 42e955b4af8f..a4fe5a6406cd 100644
--- a/toolchain/check/testdata/packages/no_prelude/missing_prelude.carbon
+++ b/toolchain/check/testdata/packages/no_prelude/missing_prelude.carbon
@@ -516,6 +516,10 @@ var n: {} = i32;
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Core
+// CHECK:STDOUT:   .Int = %Int.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @Int(%T.loc6_10.2: type, %N.loc6_20.2: @Int.%T.loc6_10.1 (%T)) {
diff --git a/toolchain/check/testdata/pointer/arrow.carbon b/toolchain/check/testdata/pointer/arrow.carbon
index 20357db04e16..61fad39d19d5 100644
--- a/toolchain/check/testdata/pointer/arrow.carbon
+++ b/toolchain/check/testdata/pointer/arrow.carbon
@@ -82,6 +82,11 @@ fn Foo(ptr: C*) {
 // CHECK:STDOUT:   %.var: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.field [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .Member = %Member.decl
+// CHECK:STDOUT:   .field = %.loc13_12
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Member[%self.param_patt: %C]();
diff --git a/toolchain/check/testdata/return/fail_return_with_returned_var.carbon b/toolchain/check/testdata/return/fail_return_with_returned_var.carbon
index 034613765e76..7e5ddbc0e76a 100644
--- a/toolchain/check/testdata/return/fail_return_with_returned_var.carbon
+++ b/toolchain/check/testdata/return/fail_return_with_returned_var.carbon
@@ -116,6 +116,11 @@ fn G() -> C {
 // CHECK:STDOUT:   %.var.loc23_23: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .a = %.loc23_16
+// CHECK:STDOUT:   .b = %.loc23_28
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %i32 {
diff --git a/toolchain/check/testdata/return/no_prelude/import_convert_function.carbon b/toolchain/check/testdata/return/no_prelude/import_convert_function.carbon
index bcfb4f071445..5b2b3ce5e7e2 100644
--- a/toolchain/check/testdata/return/no_prelude/import_convert_function.carbon
+++ b/toolchain/check/testdata/return/no_prelude/import_convert_function.carbon
@@ -271,6 +271,7 @@ fn F0(n: i32) -> P.D {
 // CHECK:STDOUT:   %N.patt: %i32.builtin = symbolic_binding_pattern N, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.116: type = class_type @C, @C(%N) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %D: type = class_type @D [template]
@@ -734,6 +735,9 @@ fn F0(n: i32) -> P.D {
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.116
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -750,6 +754,11 @@ fn F0(n: i32) -> P.D {
 // CHECK:STDOUT:   %.var.loc7_23: ref %D.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.n.m.566 [template = constants.%complete_type.682]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .n = %.loc7_16
+// CHECK:STDOUT:   .m = %.loc7_28
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @Int(%N.param_patt: Core.IntLiteral) -> type = "int.make_type_signed" [from "core.carbon"];
@@ -1134,8 +1143,12 @@ fn F0(n: i32) -> P.D {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.b0a: type = import_ref P//library, D, loaded [template = constants.%D]
 // CHECK:STDOUT:   %import_ref.7e5: <witness> = import_ref P//library, loc7_35, loaded [template = constants.%complete_type.682]
+// CHECK:STDOUT:   %import_ref.cab = import_ref P//library, inst47 [no loc], unloaded
+// CHECK:STDOUT:   %import_ref.a99 = import_ref P//library, loc7_16, unloaded
+// CHECK:STDOUT:   %import_ref.9d2 = import_ref P//library, loc7_28, unloaded
 // CHECK:STDOUT:   %import_ref.f9e: %C.type = import_ref P//library, C, loaded [template = constants.%C.generic]
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref P//library, loc6_19, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.d9b = import_ref P//library, inst42 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.ff5 = import_ref Core//default, inst49 [no loc], unloaded
 // CHECK:STDOUT:   %import_ref.589: @ImplicitAs.%Convert.assoc_type (%Convert.assoc_type.c0e) = import_ref Core//default, loc9_32, loaded [symbolic = @ImplicitAs.%assoc0 (constants.%assoc0.5048c6.2)]
 // CHECK:STDOUT:   %import_ref.e69 = import_ref Core//default, Convert, unloaded
@@ -1266,6 +1279,11 @@ fn F0(n: i32) -> P.D {
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D [from "library.carbon"] {
 // CHECK:STDOUT:   complete_type_witness = imports.%import_ref.7e5
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%import_ref.cab
+// CHECK:STDOUT:   .n = imports.%import_ref.a99
+// CHECK:STDOUT:   .m = imports.%import_ref.9d2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: generic class @C(constants.%N: %i32.builtin) [from "library.carbon"] {
@@ -1276,6 +1294,9 @@ fn F0(n: i32) -> P.D {
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.d9b
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/return/returned_var.carbon b/toolchain/check/testdata/return/returned_var.carbon
index ac8f41d9f787..1a30cd762453 100644
--- a/toolchain/check/testdata/return/returned_var.carbon
+++ b/toolchain/check/testdata/return/returned_var.carbon
@@ -106,6 +106,11 @@ fn G() -> i32 {
 // CHECK:STDOUT:   %.var.loc13: ref %C.elem = var <invalid>
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.a.b.501 [template = constants.%complete_type.705]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .a = %.loc12_8
+// CHECK:STDOUT:   .b = %.loc13_8
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %return.param_patt: %C {
diff --git a/toolchain/check/testdata/struct/import.carbon b/toolchain/check/testdata/struct/import.carbon
index eabfbe302101..5f6d07030cd5 100644
--- a/toolchain/check/testdata/struct/import.carbon
+++ b/toolchain/check/testdata/struct/import.carbon
@@ -83,6 +83,7 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:   %S.patt: %struct_type.a.b.501 = symbolic_binding_pattern S, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.775: type = class_type @C, @C(%S) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [template]
@@ -198,6 +199,9 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.775
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -311,6 +315,7 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Implicit//default, loc8_34, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.b8b = import_ref Implicit//default, inst1073 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -393,6 +398,9 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.b8b
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -481,6 +489,7 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Implicit//default, loc8_34, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.b8b = import_ref Implicit//default, inst1073 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -517,6 +526,9 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.b8b
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -589,6 +601,7 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Implicit//default, loc8_34, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.b8b = import_ref Implicit//default, inst1073 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -640,6 +653,9 @@ var c_bad: C({.a = 3, .b = 4}) = F();
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.b8b
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/tuple/import.carbon b/toolchain/check/testdata/tuple/import.carbon
index 5d092d3ca8cd..5001ec9394d4 100644
--- a/toolchain/check/testdata/tuple/import.carbon
+++ b/toolchain/check/testdata/tuple/import.carbon
@@ -99,6 +99,7 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:   %X.patt: %tuple.type.d07 = symbolic_binding_pattern X, 0 [symbolic]
 // CHECK:STDOUT:   %C.type: type = generic_class_type @C [template]
 // CHECK:STDOUT:   %C.generic: %C.type = struct_value () [template]
+// CHECK:STDOUT:   %C.54f: type = class_type @C, @C(%X) [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [template]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [template]
 // CHECK:STDOUT:   %tuple.21c: %tuple.type.d07 = tuple_value (%int_1.5d2, %int_2.ef8) [template]
@@ -213,6 +214,9 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = constants.%C.54f
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -340,6 +344,7 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Implicit//default, loc7_26, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.964 = import_ref Implicit//default, inst1108 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -429,6 +434,9 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.964
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -526,6 +534,7 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Implicit//default, loc7_26, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.964 = import_ref Implicit//default, inst1108 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -563,6 +572,9 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.964
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -635,6 +647,7 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %import_ref.8f2: <witness> = import_ref Implicit//default, loc7_26, loaded [template = constants.%complete_type.357]
+// CHECK:STDOUT:   %import_ref.964 = import_ref Implicit//default, inst1108 [no loc], unloaded
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -686,6 +699,9 @@ var c_bad: C((3, 4)) = F();
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     complete_type_witness = imports.%import_ref.8f2
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = imports.%import_ref.964
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
diff --git a/toolchain/check/testdata/var/fail_not_copyable.carbon b/toolchain/check/testdata/var/fail_not_copyable.carbon
index d4e8c65dfb22..a1baada195af 100644
--- a/toolchain/check/testdata/var/fail_not_copyable.carbon
+++ b/toolchain/check/testdata/var/fail_not_copyable.carbon
@@ -67,6 +67,9 @@ fn F(x: X) {
 // CHECK:STDOUT: class @X {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%X
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%x.param_patt: %X) {
diff --git a/toolchain/check/testdata/where_expr/constraints.carbon b/toolchain/check/testdata/where_expr/constraints.carbon
index a35a48c0bf0c..e3d785c87009 100644
--- a/toolchain/check/testdata/where_expr/constraints.carbon
+++ b/toolchain/check/testdata/where_expr/constraints.carbon
@@ -652,6 +652,9 @@ fn NotEmptyStruct() {
 // CHECK:STDOUT: class @C {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @DoesNotImplI() {
diff --git a/toolchain/check/testdata/where_expr/designator.carbon b/toolchain/check/testdata/where_expr/designator.carbon
index 3d52a462bd0f..45f6a91d5d2b 100644
--- a/toolchain/check/testdata/where_expr/designator.carbon
+++ b/toolchain/check/testdata/where_expr/designator.carbon
@@ -425,6 +425,10 @@ class D {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%C
+// CHECK:STDOUT:   .F = %F.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %return.param_patt: %C {
@@ -470,6 +474,10 @@ class D {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
+// CHECK:STDOUT:   .G = %G.decl
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @G() -> <error> {
diff --git a/toolchain/check/testdata/where_expr/equal_rewrite.carbon b/toolchain/check/testdata/where_expr/equal_rewrite.carbon
index 9534392ab9b4..c53696014930 100644
--- a/toolchain/check/testdata/where_expr/equal_rewrite.carbon
+++ b/toolchain/check/testdata/where_expr/equal_rewrite.carbon
@@ -1310,6 +1310,9 @@ let K: (E where .F = .Self.G) = bool;
 // CHECK:STDOUT: class @D {
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [template = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @__global_init() {
diff --git a/toolchain/sem_ir/formatter.cpp b/toolchain/sem_ir/formatter.cpp
index 71d35aed634c..e9705fec0862 100644
--- a/toolchain/sem_ir/formatter.cpp
+++ b/toolchain/sem_ir/formatter.cpp
@@ -281,6 +281,7 @@ class FormatterImpl {
       FormatName(class_info.complete_type_witness_id);
       out_ << "\n";
 
+      FormatNameScope(class_info.scope_id, "!members:\n");
       CloseBrace();
     } else {
       Semicolon();