Fix mangling collision for C++ class template specializations (#7269)

Carbon-side thunks (for example the `Copy`/`Destroy` witness thunks
generated for imported C++ types) are mangled by Carbon, and their names
incorporate a fingerprint of the involved types. The instruction
fingerprinter identifies a class only by its name and parent scope,
which is sufficient for Carbon classes but not for imported C++ classes:
different specializations of one class template (and other cases such as
types in anonymous namespaces) share a Carbon name and parent scope. As
a result, the thunks for two distinct specializations could mangle to
the same name, producing a single LLVM function with two definitions and
failing `verifyModule` during lowering.

When fingerprinting a class imported from C++, also include the Clang
mangled name of its type.

Test: toolchain/lower/testdata/interop/cpp/thunks.carbon gains a split
with two specializations of one class template, each requiring a thunk;
their thunks now get distinct mangled names instead of colliding.

Assisted-by: Claude Code

---------

Co-authored-by: Christopher Di Bella <cjdb.ns@gmail.com>
This commit is contained in:
Chandler Carruth
2026-05-30 08:13:00 +00:00
committed by GitHub
co-authored by Christopher Di Bella
parent 3ef128ac91
commit 8a59f2a76b
64 changed files with 4762 additions and 4330 deletions
@@ -122,7 +122,7 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %TwoTypes: type = class_type @TwoTypes [concrete]
// CHECK:STDOUT: %pattern_type.3df: type = pattern_type %TwoTypes [concrete]
// CHECK:STDOUT: %pattern_type.bc0: type = pattern_type %TwoTypes [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
// CHECK:STDOUT: %T.4ca: %Default.type = symbolic_binding T, 0 [symbolic]
@@ -131,9 +131,9 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT: %TwoTypes.Op.type: type = fn_type @TwoTypes.Op [concrete]
// CHECK:STDOUT: %TwoTypes.Op: %TwoTypes.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.213: <witness> = custom_witness (%TwoTypes.Op), @Default [concrete]
// CHECK:STDOUT: %Default.facet.ba6: %Default.type = facet_value %TwoTypes, (%custom_witness.213) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.462: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.ba6) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %TwoTypes, (%DefaultOrUnformed.impl_witness.462) [concrete]
// CHECK:STDOUT: %Default.facet.f94: %Default.type = facet_value %TwoTypes, (%custom_witness.213) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.b65: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.f94) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %TwoTypes, (%DefaultOrUnformed.impl_witness.b65) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
@@ -143,8 +143,8 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.3df = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.3df = var_pattern %x.patt [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.bc0 = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.bc0 = var_pattern %x.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var: ref %TwoTypes = var %x.var_patt [concrete]
// CHECK:STDOUT: %x: ref %TwoTypes = ref_binding x, %x.var [concrete = %x.var]
@@ -152,7 +152,7 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%TwoTypes, (constants.%DefaultOrUnformed.impl_witness.462) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%TwoTypes, (constants.%DefaultOrUnformed.impl_witness.b65) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc7_34.1: %DefaultOrUnformed.type = converted constants.%TwoTypes, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc7_34.1 [concrete = constants.%TwoTypes]
// CHECK:STDOUT: %.loc7_34.2: type = converted %.loc7_34.1, %as_type [concrete = constants.%TwoTypes]
@@ -166,8 +166,8 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT: --- pack.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %TypePack.ef9a30.1: type = class_type @TypePack.1 [concrete]
// CHECK:STDOUT: %pattern_type.9115dc.1: type = pattern_type %TypePack.ef9a30.1 [concrete]
// CHECK:STDOUT: %TypePack.894: type = class_type @TypePack.1 [concrete]
// CHECK:STDOUT: %pattern_type.c42: type = pattern_type %TypePack.894 [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
// CHECK:STDOUT: %T.4ca: %Default.type = symbolic_binding T, 0 [symbolic]
@@ -176,33 +176,33 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT: %TypePack.Op.type.43d658.1: type = fn_type @TypePack.Op.1 [concrete]
// CHECK:STDOUT: %TypePack.Op.cc70d5.1: %TypePack.Op.type.43d658.1 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.2132a4.1: <witness> = custom_witness (%TypePack.Op.cc70d5.1), @Default [concrete]
// CHECK:STDOUT: %Default.facet.5ed9a2.1: %Default.type = facet_value %TypePack.ef9a30.1, (%custom_witness.2132a4.1) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.bf0e48.1: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.5ed9a2.1) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.86aa39.1: %DefaultOrUnformed.type = facet_value %TypePack.ef9a30.1, (%DefaultOrUnformed.impl_witness.bf0e48.1) [concrete]
// CHECK:STDOUT: %TypePack.ef9a30.2: type = class_type @TypePack.2 [concrete]
// CHECK:STDOUT: %pattern_type.9115dc.2: type = pattern_type %TypePack.ef9a30.2 [concrete]
// CHECK:STDOUT: %Default.facet.bef: %Default.type = facet_value %TypePack.894, (%custom_witness.2132a4.1) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.967: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.bef) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.dc4: %DefaultOrUnformed.type = facet_value %TypePack.894, (%DefaultOrUnformed.impl_witness.967) [concrete]
// CHECK:STDOUT: %TypePack.5b2: type = class_type @TypePack.2 [concrete]
// CHECK:STDOUT: %pattern_type.891: type = pattern_type %TypePack.5b2 [concrete]
// CHECK:STDOUT: %TypePack.Op.type.43d658.2: type = fn_type @TypePack.Op.2 [concrete]
// CHECK:STDOUT: %TypePack.Op.cc70d5.2: %TypePack.Op.type.43d658.2 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.2132a4.2: <witness> = custom_witness (%TypePack.Op.cc70d5.2), @Default [concrete]
// CHECK:STDOUT: %Default.facet.5ed9a2.2: %Default.type = facet_value %TypePack.ef9a30.2, (%custom_witness.2132a4.2) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.bf0e48.2: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.5ed9a2.2) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.86aa39.2: %DefaultOrUnformed.type = facet_value %TypePack.ef9a30.2, (%DefaultOrUnformed.impl_witness.bf0e48.2) [concrete]
// CHECK:STDOUT: %TypePack.ef9a30.3: type = class_type @TypePack.3 [concrete]
// CHECK:STDOUT: %pattern_type.9115dc.3: type = pattern_type %TypePack.ef9a30.3 [concrete]
// CHECK:STDOUT: %Default.facet.598: %Default.type = facet_value %TypePack.5b2, (%custom_witness.2132a4.2) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.f8d: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.598) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.28c: %DefaultOrUnformed.type = facet_value %TypePack.5b2, (%DefaultOrUnformed.impl_witness.f8d) [concrete]
// CHECK:STDOUT: %TypePack.93d: type = class_type @TypePack.3 [concrete]
// CHECK:STDOUT: %pattern_type.fce: type = pattern_type %TypePack.93d [concrete]
// CHECK:STDOUT: %TypePack.Op.type.43d658.3: type = fn_type @TypePack.Op.3 [concrete]
// CHECK:STDOUT: %TypePack.Op.cc70d5.3: %TypePack.Op.type.43d658.3 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.2132a4.3: <witness> = custom_witness (%TypePack.Op.cc70d5.3), @Default [concrete]
// CHECK:STDOUT: %Default.facet.5ed9a2.3: %Default.type = facet_value %TypePack.ef9a30.3, (%custom_witness.2132a4.3) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.bf0e48.3: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.5ed9a2.3) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.86aa39.3: %DefaultOrUnformed.type = facet_value %TypePack.ef9a30.3, (%DefaultOrUnformed.impl_witness.bf0e48.3) [concrete]
// CHECK:STDOUT: %TypePack.ef9a30.4: type = class_type @TypePack.4 [concrete]
// CHECK:STDOUT: %pattern_type.9115dc.4: type = pattern_type %TypePack.ef9a30.4 [concrete]
// CHECK:STDOUT: %Default.facet.37a: %Default.type = facet_value %TypePack.93d, (%custom_witness.2132a4.3) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.d66: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.37a) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.092: %DefaultOrUnformed.type = facet_value %TypePack.93d, (%DefaultOrUnformed.impl_witness.d66) [concrete]
// CHECK:STDOUT: %TypePack.51e: type = class_type @TypePack.4 [concrete]
// CHECK:STDOUT: %pattern_type.f1d: type = pattern_type %TypePack.51e [concrete]
// CHECK:STDOUT: %TypePack.Op.type.43d658.4: type = fn_type @TypePack.Op.4 [concrete]
// CHECK:STDOUT: %TypePack.Op.cc70d5.4: %TypePack.Op.type.43d658.4 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.2132a4.4: <witness> = custom_witness (%TypePack.Op.cc70d5.4), @Default [concrete]
// CHECK:STDOUT: %Default.facet.5ed9a2.4: %Default.type = facet_value %TypePack.ef9a30.4, (%custom_witness.2132a4.4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.bf0e48.4: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.5ed9a2.4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.86aa39.4: %DefaultOrUnformed.type = facet_value %TypePack.ef9a30.4, (%DefaultOrUnformed.impl_witness.bf0e48.4) [concrete]
// CHECK:STDOUT: %Default.facet.fb9: %Default.type = facet_value %TypePack.51e, (%custom_witness.2132a4.4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.dd3: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.b72, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.fb9) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet.1d3: %DefaultOrUnformed.type = facet_value %TypePack.51e, (%DefaultOrUnformed.impl_witness.dd3) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
@@ -212,64 +212,64 @@ var too_many: Cpp.FixedSizePack(Cpp.A, Cpp.A).Inner(Cpp.B, Cpp.B, Cpp.B);
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a0.patt: %pattern_type.9115dc.1 = ref_binding_pattern a0 [concrete]
// CHECK:STDOUT: %a0.var_patt: %pattern_type.9115dc.1 = var_pattern %a0.patt [concrete]
// CHECK:STDOUT: %a0.patt: %pattern_type.c42 = ref_binding_pattern a0 [concrete]
// CHECK:STDOUT: %a0.var_patt: %pattern_type.c42 = var_pattern %a0.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a0.var: ref %TypePack.ef9a30.1 = var %a0.var_patt [concrete]
// CHECK:STDOUT: %a0: ref %TypePack.ef9a30.1 = ref_binding a0, %a0.var [concrete = %a0.var]
// CHECK:STDOUT: %a0.var: ref %TypePack.894 = var %a0.var_patt [concrete]
// CHECK:STDOUT: %a0: ref %TypePack.894 = ref_binding a0, %a0.var [concrete = %a0.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a1.patt: %pattern_type.9115dc.2 = ref_binding_pattern a1 [concrete]
// CHECK:STDOUT: %a1.var_patt: %pattern_type.9115dc.2 = var_pattern %a1.patt [concrete]
// CHECK:STDOUT: %a1.patt: %pattern_type.891 = ref_binding_pattern a1 [concrete]
// CHECK:STDOUT: %a1.var_patt: %pattern_type.891 = var_pattern %a1.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a1.var: ref %TypePack.ef9a30.2 = var %a1.var_patt [concrete]
// CHECK:STDOUT: %a1: ref %TypePack.ef9a30.2 = ref_binding a1, %a1.var [concrete = %a1.var]
// CHECK:STDOUT: %a1.var: ref %TypePack.5b2 = var %a1.var_patt [concrete]
// CHECK:STDOUT: %a1: ref %TypePack.5b2 = ref_binding a1, %a1.var [concrete = %a1.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a2.patt: %pattern_type.9115dc.3 = ref_binding_pattern a2 [concrete]
// CHECK:STDOUT: %a2.var_patt: %pattern_type.9115dc.3 = var_pattern %a2.patt [concrete]
// CHECK:STDOUT: %a2.patt: %pattern_type.fce = ref_binding_pattern a2 [concrete]
// CHECK:STDOUT: %a2.var_patt: %pattern_type.fce = var_pattern %a2.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a2.var: ref %TypePack.ef9a30.3 = var %a2.var_patt [concrete]
// CHECK:STDOUT: %a2: ref %TypePack.ef9a30.3 = ref_binding a2, %a2.var [concrete = %a2.var]
// CHECK:STDOUT: %a2.var: ref %TypePack.93d = var %a2.var_patt [concrete]
// CHECK:STDOUT: %a2: ref %TypePack.93d = ref_binding a2, %a2.var [concrete = %a2.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a3.patt: %pattern_type.9115dc.4 = ref_binding_pattern a3 [concrete]
// CHECK:STDOUT: %a3.var_patt: %pattern_type.9115dc.4 = var_pattern %a3.patt [concrete]
// CHECK:STDOUT: %a3.patt: %pattern_type.f1d = ref_binding_pattern a3 [concrete]
// CHECK:STDOUT: %a3.var_patt: %pattern_type.f1d = var_pattern %a3.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a3.var: ref %TypePack.ef9a30.4 = var %a3.var_patt [concrete]
// CHECK:STDOUT: %a3: ref %TypePack.ef9a30.4 = ref_binding a3, %a3.var [concrete = %a3.var]
// CHECK:STDOUT: %a3.var: ref %TypePack.51e = var %a3.var_patt [concrete]
// CHECK:STDOUT: %a3: ref %TypePack.51e = ref_binding a3, %a3.var [concrete = %a3.var]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc7: %DefaultOrUnformed.type = facet_value constants.%TypePack.ef9a30.1, (constants.%DefaultOrUnformed.impl_witness.bf0e48.1) [concrete = constants.%DefaultOrUnformed.facet.86aa39.1]
// CHECK:STDOUT: %.loc7_23.1: %DefaultOrUnformed.type = converted constants.%TypePack.ef9a30.1, %DefaultOrUnformed.facet.loc7 [concrete = constants.%DefaultOrUnformed.facet.86aa39.1]
// CHECK:STDOUT: %as_type.loc7: type = facet_access_type %.loc7_23.1 [concrete = constants.%TypePack.ef9a30.1]
// CHECK:STDOUT: %.loc7_23.2: type = converted %.loc7_23.1, %as_type.loc7 [concrete = constants.%TypePack.ef9a30.1]
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc7: %DefaultOrUnformed.type = facet_value constants.%TypePack.894, (constants.%DefaultOrUnformed.impl_witness.967) [concrete = constants.%DefaultOrUnformed.facet.dc4]
// CHECK:STDOUT: %.loc7_23.1: %DefaultOrUnformed.type = converted constants.%TypePack.894, %DefaultOrUnformed.facet.loc7 [concrete = constants.%DefaultOrUnformed.facet.dc4]
// CHECK:STDOUT: %as_type.loc7: type = facet_access_type %.loc7_23.1 [concrete = constants.%TypePack.894]
// CHECK:STDOUT: %.loc7_23.2: type = converted %.loc7_23.1, %as_type.loc7 [concrete = constants.%TypePack.894]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc7_1: ref %TypePack.ef9a30.1 = splice_block file.%a0.var [concrete = file.%a0.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc7: init %TypePack.ef9a30.1 to %.loc7_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.1()
// CHECK:STDOUT: %.loc7_1: ref %TypePack.894 = splice_block file.%a0.var [concrete = file.%a0.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc7: init %TypePack.894 to %.loc7_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.1()
// CHECK:STDOUT: assign file.%a0.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc7
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc8: %DefaultOrUnformed.type = facet_value constants.%TypePack.ef9a30.2, (constants.%DefaultOrUnformed.impl_witness.bf0e48.2) [concrete = constants.%DefaultOrUnformed.facet.86aa39.2]
// CHECK:STDOUT: %.loc8_28.1: %DefaultOrUnformed.type = converted constants.%TypePack.ef9a30.2, %DefaultOrUnformed.facet.loc8 [concrete = constants.%DefaultOrUnformed.facet.86aa39.2]
// CHECK:STDOUT: %as_type.loc8: type = facet_access_type %.loc8_28.1 [concrete = constants.%TypePack.ef9a30.2]
// CHECK:STDOUT: %.loc8_28.2: type = converted %.loc8_28.1, %as_type.loc8 [concrete = constants.%TypePack.ef9a30.2]
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc8: %DefaultOrUnformed.type = facet_value constants.%TypePack.5b2, (constants.%DefaultOrUnformed.impl_witness.f8d) [concrete = constants.%DefaultOrUnformed.facet.28c]
// CHECK:STDOUT: %.loc8_28.1: %DefaultOrUnformed.type = converted constants.%TypePack.5b2, %DefaultOrUnformed.facet.loc8 [concrete = constants.%DefaultOrUnformed.facet.28c]
// CHECK:STDOUT: %as_type.loc8: type = facet_access_type %.loc8_28.1 [concrete = constants.%TypePack.5b2]
// CHECK:STDOUT: %.loc8_28.2: type = converted %.loc8_28.1, %as_type.loc8 [concrete = constants.%TypePack.5b2]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc8_1: ref %TypePack.ef9a30.2 = splice_block file.%a1.var [concrete = file.%a1.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc8: init %TypePack.ef9a30.2 to %.loc8_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.2()
// CHECK:STDOUT: %.loc8_1: ref %TypePack.5b2 = splice_block file.%a1.var [concrete = file.%a1.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc8: init %TypePack.5b2 to %.loc8_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.2()
// CHECK:STDOUT: assign file.%a1.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc8
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc9: %DefaultOrUnformed.type = facet_value constants.%TypePack.ef9a30.3, (constants.%DefaultOrUnformed.impl_witness.bf0e48.3) [concrete = constants.%DefaultOrUnformed.facet.86aa39.3]
// CHECK:STDOUT: %.loc9_35.1: %DefaultOrUnformed.type = converted constants.%TypePack.ef9a30.3, %DefaultOrUnformed.facet.loc9 [concrete = constants.%DefaultOrUnformed.facet.86aa39.3]
// CHECK:STDOUT: %as_type.loc9: type = facet_access_type %.loc9_35.1 [concrete = constants.%TypePack.ef9a30.3]
// CHECK:STDOUT: %.loc9_35.2: type = converted %.loc9_35.1, %as_type.loc9 [concrete = constants.%TypePack.ef9a30.3]
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc9: %DefaultOrUnformed.type = facet_value constants.%TypePack.93d, (constants.%DefaultOrUnformed.impl_witness.d66) [concrete = constants.%DefaultOrUnformed.facet.092]
// CHECK:STDOUT: %.loc9_35.1: %DefaultOrUnformed.type = converted constants.%TypePack.93d, %DefaultOrUnformed.facet.loc9 [concrete = constants.%DefaultOrUnformed.facet.092]
// CHECK:STDOUT: %as_type.loc9: type = facet_access_type %.loc9_35.1 [concrete = constants.%TypePack.93d]
// CHECK:STDOUT: %.loc9_35.2: type = converted %.loc9_35.1, %as_type.loc9 [concrete = constants.%TypePack.93d]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc9_1: ref %TypePack.ef9a30.3 = splice_block file.%a2.var [concrete = file.%a2.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc9: init %TypePack.ef9a30.3 to %.loc9_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.3()
// CHECK:STDOUT: %.loc9_1: ref %TypePack.93d = splice_block file.%a2.var [concrete = file.%a2.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc9: init %TypePack.93d to %.loc9_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.3()
// CHECK:STDOUT: assign file.%a2.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc9
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc10: %DefaultOrUnformed.type = facet_value constants.%TypePack.ef9a30.4, (constants.%DefaultOrUnformed.impl_witness.bf0e48.4) [concrete = constants.%DefaultOrUnformed.facet.86aa39.4]
// CHECK:STDOUT: %.loc10_42.1: %DefaultOrUnformed.type = converted constants.%TypePack.ef9a30.4, %DefaultOrUnformed.facet.loc10 [concrete = constants.%DefaultOrUnformed.facet.86aa39.4]
// CHECK:STDOUT: %as_type.loc10: type = facet_access_type %.loc10_42.1 [concrete = constants.%TypePack.ef9a30.4]
// CHECK:STDOUT: %.loc10_42.2: type = converted %.loc10_42.1, %as_type.loc10 [concrete = constants.%TypePack.ef9a30.4]
// CHECK:STDOUT: %DefaultOrUnformed.facet.loc10: %DefaultOrUnformed.type = facet_value constants.%TypePack.51e, (constants.%DefaultOrUnformed.impl_witness.dd3) [concrete = constants.%DefaultOrUnformed.facet.1d3]
// CHECK:STDOUT: %.loc10_42.1: %DefaultOrUnformed.type = converted constants.%TypePack.51e, %DefaultOrUnformed.facet.loc10 [concrete = constants.%DefaultOrUnformed.facet.1d3]
// CHECK:STDOUT: %as_type.loc10: type = facet_access_type %.loc10_42.1 [concrete = constants.%TypePack.51e]
// CHECK:STDOUT: %.loc10_42.2: type = converted %.loc10_42.1, %as_type.loc10 [concrete = constants.%TypePack.51e]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc10_1: ref %TypePack.ef9a30.4 = splice_block file.%a3.var [concrete = file.%a3.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc10: init %TypePack.ef9a30.4 to %.loc10_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.4()
// CHECK:STDOUT: %.loc10_1: ref %TypePack.51e = splice_block file.%a3.var [concrete = file.%a3.var] {}
// CHECK:STDOUT: %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc10: init %TypePack.51e to %.loc10_1 = call %T.as_type.as.DefaultOrUnformed.impl.Op.specific_fn.4()
// CHECK:STDOUT: assign file.%a3.var, %T.as_type.as.DefaultOrUnformed.impl.Op.call.loc10
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }