Generate Destroy impls for classes (#5873)

Although this focused on `Destroy` support, some choices here around `implicit_type_impls` are because copy/move will likely follow a similar approach. I'm trying not to predict too much about how we'll structure those, but I'm putting `Destroy` impl logic in a file that could perhaps be shared with those. They'd likely be interested in similar things, e.g. traversing members of types (particularly class, struct literal, tuple literal). At present this sets the destroy function as `no_op` which is consistent with current logic, but has a TODO to correctly define. Constant importing for functions changes slightly due to some issues I was having with `GetFunctionType`. zygoloid suggested this approach to avoid `EvalInst` logic. Adds a flag for controlling whether to generating these impls. While this does generation for `class`, as noted above this'll also need to be done for tuples and struct literals, which would leave the `none.carbon` min_prelude unable to use any types. Note if destruction *would* occur, it'll still look up `Core.Destroy` for that and fail, but that's already true of any test using `none.carbon`. I'm trying to use the flag to see if we can keep `none.carbon` working mostly-consistently. I'd tried separating out the flag to #5852, but that got a lot of pushback over whether the behavior was appropriate. I'm hoping that the interactions here make it clearer why the particular approach -- the goal is not to enable advanced testing, or create some new end-user behavior that we really support, it's just to keep no-prelude tests functional. The main question raised there was why not just keep generating `impl T as Core.Destroy` if `fn destroy` is present -- but I think here it should be apparent that would require additional complexity, as the generation of `impl T as Core.Destroy` is not currently conditioned based on the implementation of `fn destroy`. I'd rather add complexity to this flag only if it's enabling interesting test functionality. --------- Co-authored-by: Geoff Romer <gromer@google.com>
2026-10-05 19:11:09 +01:00 · 2025-08-04 19:39:22 +00:00
parent a5a5e381be
commit 7209ad7c9f
215 changed files with 22244 additions and 2727 deletions
@@ -38,6 +38,7 @@ fn Main() {
 // CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
 // CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
 // CHECK:STDOUT:   %ImplicitAs.Convert.type.1b6: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
 // CHECK:STDOUT:   %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
 // CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
 // CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.f06: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9 = struct_value () [symbolic]
@@ -50,7 +51,6 @@ fn Main() {
 // CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.956, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
 // CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
 // CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
-// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.a17: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%i32) [concrete]
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.e6a: %T.as.Destroy.impl.Op.type.a17 = struct_value () [concrete]
 // CHECK:STDOUT:   %ptr.235: type = ptr_type %i32 [concrete]
@@ -42,6 +42,7 @@ fn Main() {
 // CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
 // CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
 // CHECK:STDOUT:   %ImplicitAs.Convert.type.1b6: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
 // CHECK:STDOUT:   %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
 // CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
 // CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.f06: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9 = struct_value () [symbolic]
@@ -60,7 +61,6 @@ fn Main() {
 // CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.ce9: <bound method> = bound_method %int_6.462, %Core.IntLiteral.as.ImplicitAs.impl.Convert.956 [concrete]
 // CHECK:STDOUT:   %bound_method.efa: <bound method> = bound_method %int_6.462, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
 // CHECK:STDOUT:   %int_6.e56: %i32 = int_value 6 [concrete]
-// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.438: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%tuple.type.a1c) [concrete]
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.c8e: %T.as.Destroy.impl.Op.type.438 = struct_value () [concrete]
 // CHECK:STDOUT:   %ptr.0b7: type = ptr_type %tuple.type.a1c [concrete]
@@ -45,8 +45,20 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:   %Inner.F: %Inner.F.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %Inner.G.type: type = fn_type @Inner.G, @Inner(%F) [symbolic]
 // CHECK:STDOUT:   %Inner.G: %Inner.G.type = struct_value () [symbolic]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.3a7: <witness> = impl_witness @Inner.%Destroy.impl_witness_table, @Inner.as.Destroy.impl(%F) [symbolic]
+// CHECK:STDOUT:   %ptr.2b5: type = ptr_type %Inner [symbolic]
+// CHECK:STDOUT:   %pattern_type.2df: type = pattern_type %ptr.2b5 [symbolic]
+// CHECK:STDOUT:   %Inner.as.Destroy.impl.Op.type: type = fn_type @Inner.as.Destroy.impl.Op, @Inner.as.Destroy.impl(%F) [symbolic]
+// CHECK:STDOUT:   %Inner.as.Destroy.impl.Op: %Inner.as.Destroy.impl.Op.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.95a: <witness> = impl_witness @Class.%Destroy.impl_witness_table, @Class.as.Destroy.impl(%F) [symbolic]
+// CHECK:STDOUT:   %ptr.955: type = ptr_type %Class [symbolic]
+// CHECK:STDOUT:   %pattern_type.9e0: type = pattern_type %ptr.955 [symbolic]
+// CHECK:STDOUT:   %Class.as.Destroy.impl.Op.type: type = fn_type @Class.as.Destroy.impl.Op, @Class.as.Destroy.impl(%F) [symbolic]
+// CHECK:STDOUT:   %Class.as.Destroy.impl.Op: %Class.as.Destroy.impl.Op.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
 // CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
 // CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
@@ -70,11 +82,13 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .Destroy = %Core.Destroy
 // CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
 // CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/parts/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
 // CHECK:STDOUT:   %Core.import_ref.a5b: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9) = import_ref Core//prelude/parts/int, loc16_39, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.f06)]
 // CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
@@ -103,6 +117,62 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @Inner.as.Destroy.impl(@Class.%F.loc5_13.2: type) {
+// CHECK:STDOUT:   %F: type = bind_symbolic_name F, 0 [symbolic = %F (constants.%F)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @Inner.%Destroy.impl_witness_table, @Inner.as.Destroy.impl(%F) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.3a7)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Inner.as.Destroy.impl.Op.type: type = fn_type @Inner.as.Destroy.impl.Op, @Inner.as.Destroy.impl(%F) [symbolic = %Inner.as.Destroy.impl.Op.type (constants.%Inner.as.Destroy.impl.Op.type)]
+// CHECK:STDOUT:   %Inner.as.Destroy.impl.Op: @Inner.as.Destroy.impl.%Inner.as.Destroy.impl.Op.type (%Inner.as.Destroy.impl.Op.type) = struct_value () [symbolic = %Inner.as.Destroy.impl.Op (constants.%Inner.as.Destroy.impl.Op)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: constants.%Inner as constants.%Destroy.type {
+// CHECK:STDOUT:     %Inner.as.Destroy.impl.Op.decl: @Inner.as.Destroy.impl.%Inner.as.Destroy.impl.Op.type (%Inner.as.Destroy.impl.Op.type) = fn_decl @Inner.as.Destroy.impl.Op [symbolic = @Inner.as.Destroy.impl.%Inner.as.Destroy.impl.Op (constants.%Inner.as.Destroy.impl.Op)] {
+// CHECK:STDOUT:       %self.patt: @Inner.as.Destroy.impl.Op.%pattern_type (%pattern_type.2df) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @Inner.as.Destroy.impl.Op.%pattern_type (%pattern_type.2df) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %.loc6_15.1: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %self.param: @Inner.as.Destroy.impl.Op.%ptr (%ptr.2b5) = value_param call_param0
+// CHECK:STDOUT:       %.loc6_15.2: type = splice_block %Self.ref [symbolic = %Inner (constants.%Inner)] {
+// CHECK:STDOUT:         %.loc6_15.3: type = specific_constant constants.%Inner, @Inner(constants.%F) [symbolic = %Inner (constants.%Inner)]
+// CHECK:STDOUT:         %Self.ref: type = name_ref Self, %.loc6_15.3 [symbolic = %Inner (constants.%Inner)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Inner.as.Destroy.impl.Op.%ptr (%ptr.2b5) = bind_name self, %self.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %Inner.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:     witness = @Inner.%Destroy.impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @Class.as.Destroy.impl(@Class.%F.loc5_13.2: type) {
+// CHECK:STDOUT:   %F: type = bind_symbolic_name F, 0 [symbolic = %F (constants.%F)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @Class.%Destroy.impl_witness_table, @Class.as.Destroy.impl(%F) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.95a)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Class.as.Destroy.impl.Op.type: type = fn_type @Class.as.Destroy.impl.Op, @Class.as.Destroy.impl(%F) [symbolic = %Class.as.Destroy.impl.Op.type (constants.%Class.as.Destroy.impl.Op.type)]
+// CHECK:STDOUT:   %Class.as.Destroy.impl.Op: @Class.as.Destroy.impl.%Class.as.Destroy.impl.Op.type (%Class.as.Destroy.impl.Op.type) = struct_value () [symbolic = %Class.as.Destroy.impl.Op (constants.%Class.as.Destroy.impl.Op)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: constants.%Class as constants.%Destroy.type {
+// CHECK:STDOUT:     %Class.as.Destroy.impl.Op.decl: @Class.as.Destroy.impl.%Class.as.Destroy.impl.Op.type (%Class.as.Destroy.impl.Op.type) = fn_decl @Class.as.Destroy.impl.Op [symbolic = @Class.as.Destroy.impl.%Class.as.Destroy.impl.Op (constants.%Class.as.Destroy.impl.Op)] {
+// CHECK:STDOUT:       %self.patt: @Class.as.Destroy.impl.Op.%pattern_type (%pattern_type.9e0) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @Class.as.Destroy.impl.Op.%pattern_type (%pattern_type.9e0) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %.loc5_23.1: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %self.param: @Class.as.Destroy.impl.Op.%ptr (%ptr.955) = value_param call_param0
+// CHECK:STDOUT:       %.loc5_23.2: type = splice_block %Self.ref [symbolic = %Class (constants.%Class)] {
+// CHECK:STDOUT:         %.loc5_23.3: type = specific_constant constants.%Class, @Class(constants.%F) [symbolic = %Class (constants.%Class)]
+// CHECK:STDOUT:         %Self.ref: type = name_ref Self, %.loc5_23.3 [symbolic = %Class (constants.%Class)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Class.as.Destroy.impl.Op.%ptr (%ptr.955) = bind_name self, %self.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %Class.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:     witness = @Class.%Destroy.impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Class(%F.loc5_13.2: type) {
 // CHECK:STDOUT:   %F.loc5_13.1: type = bind_symbolic_name F, 0 [symbolic = %F.loc5_13.1 (constants.%F)]
 // CHECK:STDOUT:
@@ -111,6 +181,9 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
 // CHECK:STDOUT:     %Inner.decl: type = class_decl @Inner [symbolic = @Class.%Inner (constants.%Inner)] {} {}
+// CHECK:STDOUT:     impl_decl @Class.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:     %Destroy.impl_witness_table = impl_witness_table (@Class.as.Destroy.impl.%Class.as.Destroy.impl.Op.decl), @Class.as.Destroy.impl [concrete]
+// CHECK:STDOUT:     %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table, @Class.as.Destroy.impl(constants.%F) [symbolic = @Class.as.Destroy.impl.%Destroy.impl_witness (constants.%Destroy.impl_witness.95a)]
 // CHECK:STDOUT:     %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
@@ -148,6 +221,9 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:       %return.param.loc9: ref %i32 = out_param call_param0
 // CHECK:STDOUT:       %return.loc9: ref %i32 = return_slot %return.param.loc9
 // CHECK:STDOUT:     }
+// CHECK:STDOUT:     impl_decl @Inner.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:     %Destroy.impl_witness_table = impl_witness_table (@Inner.as.Destroy.impl.%Inner.as.Destroy.impl.Op.decl), @Inner.as.Destroy.impl [concrete]
+// CHECK:STDOUT:     %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table, @Inner.as.Destroy.impl(constants.%F) [symbolic = @Inner.as.Destroy.impl.%Destroy.impl_witness (constants.%Destroy.impl_witness.3a7)]
 // CHECK:STDOUT:     %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
@@ -195,6 +271,28 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Inner.as.Destroy.impl.Op(@Class.%F.loc5_13.2: type) {
+// CHECK:STDOUT:   %F: type = bind_symbolic_name F, 0 [symbolic = %F (constants.%F)]
+// CHECK:STDOUT:   %Inner: type = class_type @Inner, @Inner(%F) [symbolic = %Inner (constants.%Inner)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %Inner [symbolic = %ptr (constants.%ptr.2b5)]
+// CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr [symbolic = %pattern_type (constants.%pattern_type.2df)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @Inner.as.Destroy.impl.Op.%ptr (%ptr.2b5)) = "no_op";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Class.as.Destroy.impl.Op(@Class.%F.loc5_13.2: type) {
+// CHECK:STDOUT:   %F: type = bind_symbolic_name F, 0 [symbolic = %F (constants.%F)]
+// CHECK:STDOUT:   %Class: type = class_type @Class, @Class(%F) [symbolic = %Class (constants.%Class)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %Class [symbolic = %ptr (constants.%ptr.955)]
+// CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr [symbolic = %pattern_type (constants.%pattern_type.9e0)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @Class.as.Destroy.impl.Op.%ptr (%ptr.955)) = "no_op";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: specific @Class(constants.%F) {
 // CHECK:STDOUT:   %F.loc5_13.1 => constants.%F
 // CHECK:STDOUT:
@@ -217,3 +315,27 @@ fn Class(F:! type).Inner.G() -> i32 { return F(); }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @Inner.G(constants.%F) {}
 // CHECK:STDOUT:
+// CHECK:STDOUT: specific @Inner.as.Destroy.impl(constants.%F) {
+// CHECK:STDOUT:   %F => constants.%F
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.3a7
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Inner.as.Destroy.impl.Op(constants.%F) {
+// CHECK:STDOUT:   %F => constants.%F
+// CHECK:STDOUT:   %Inner => constants.%Inner
+// CHECK:STDOUT:   %ptr => constants.%ptr.2b5
+// CHECK:STDOUT:   %pattern_type => constants.%pattern_type.2df
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Class.as.Destroy.impl(constants.%F) {
+// CHECK:STDOUT:   %F => constants.%F
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.95a
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Class.as.Destroy.impl.Op(constants.%F) {
+// CHECK:STDOUT:   %F => constants.%F
+// CHECK:STDOUT:   %Class => constants.%Class
+// CHECK:STDOUT:   %ptr => constants.%ptr.955
+// CHECK:STDOUT:   %pattern_type => constants.%pattern_type.9e0
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
@@ -105,15 +105,24 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   %ReturnDUsed: %ReturnDUsed.type = struct_value () [concrete]
 // CHECK:STDOUT:   %Call.type: type = fn_type @Call [concrete]
 // CHECK:STDOUT:   %Call: %Call.type = struct_value () [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @D.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.19c: type = ptr_type %D [concrete]
+// CHECK:STDOUT:   %pattern_type.a94: type = pattern_type %ptr.19c [concrete]
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.type: type = fn_type @D.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op: %D.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Destroy = %Core.Destroy
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -166,9 +175,28 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   %D.decl.loc37: type = class_decl @D [concrete = constants.%D] {} {}
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @D.as.Destroy.impl: constants.%D as constants.%Destroy.type {
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.decl: %D.as.Destroy.impl.Op.type = fn_decl @D.as.Destroy.impl.Op [concrete = constants.%D.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.a94 = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.a94 = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc37: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.19c = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%D [concrete = constants.%D]
+// CHECK:STDOUT:     %self: %ptr.19c = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %D.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @D.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: class @C;
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @D {
+// CHECK:STDOUT:   impl_decl @D.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@D.as.Destroy.impl.%D.as.Destroy.impl.Op.decl), @D.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -194,6 +222,8 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @D.as.Destroy.impl.Op(%self.param: %ptr.19c) = "no_op";
+// CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_use_imported.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
@@ -206,16 +236,16 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   %ReturnCUsed: %ReturnCUsed.type = struct_value () [concrete]
 // CHECK:STDOUT:   %ReturnDUnused.type: type = fn_type @ReturnDUnused [concrete]
 // CHECK:STDOUT:   %ReturnDUnused: %ReturnDUnused.type = struct_value () [concrete]
-// CHECK:STDOUT:   %D: type = class_type @D [concrete]
+// CHECK:STDOUT:   %D.b3dde2.1: type = class_type @D.1 [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
-// CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %ReturnDUsed.type: type = fn_type @ReturnDUsed [concrete]
 // CHECK:STDOUT:   %ReturnDUsed: %ReturnDUsed.type = struct_value () [concrete]
 // CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.548: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%D) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.2d4: %T.as.Destroy.impl.Op.type.548 = struct_value () [concrete]
-// CHECK:STDOUT:   %ptr.19c: type = ptr_type %D [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function %T.as.Destroy.impl.Op.2d4, @T.as.Destroy.impl.Op(%D) [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.b6f: <witness> = impl_witness imports.%Destroy.impl_witness_table.cd7 [concrete]
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.type: type = fn_type @D.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op: %D.as.Destroy.impl.Op.type = struct_value () [concrete]
+// CHECK:STDOUT:   %ptr.19c: type = ptr_type %D.b3dde2.1 [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -231,9 +261,16 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
-// CHECK:STDOUT:   %Main.import_ref.8f2: <witness> = import_ref Main//incomplete_return, loc37_10, loaded [concrete = constants.%complete_type.357]
-// CHECK:STDOUT:   %Main.import_ref.cab = import_ref Main//incomplete_return, inst20 [no loc], unloaded
+// CHECK:STDOUT:   %Main.import_ref.8f24d3.1: <witness> = import_ref Main//incomplete_return, loc37_10, loaded [concrete = constants.%complete_type]
+// CHECK:STDOUT:   %Main.import_ref.cabe25.1 = import_ref Main//incomplete_return, inst20 [no loc], unloaded
 // CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
+// CHECK:STDOUT:   %Main.import_ref.7ba: <witness> = import_ref Main//incomplete_return, loc37_9, loaded [concrete = constants.%Destroy.impl_witness.b6f]
+// CHECK:STDOUT:   %Main.import_ref.8f24d3.2: <witness> = import_ref Main//incomplete_return, loc37_10, loaded [concrete = constants.%complete_type]
+// CHECK:STDOUT:   %Main.import_ref.cabe25.2 = import_ref Main//incomplete_return, inst20 [no loc], unloaded
+// CHECK:STDOUT:   %Main.import_ref.4aa: type = import_ref Main//incomplete_return, inst20 [no loc], loaded [concrete = constants.%D.b3dde2.1]
+// CHECK:STDOUT:   %Main.import_ref.cb9: type = import_ref Main//incomplete_return, inst67 [no loc], loaded [concrete = constants.%Destroy.type]
+// CHECK:STDOUT:   %Main.import_ref.283: %D.as.Destroy.impl.Op.type = import_ref Main//incomplete_return, loc37_9, loaded [concrete = constants.%D.as.Destroy.impl.Op]
+// CHECK:STDOUT:   %Destroy.impl_witness_table.cd7 = impl_witness_table (%Main.import_ref.283), @D.as.Destroy.impl [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -253,13 +290,25 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   %CallFAndGIncomplete.decl: %CallFAndGIncomplete.type = fn_decl @CallFAndGIncomplete [concrete = constants.%CallFAndGIncomplete] {} {}
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @D.as.Destroy.impl: imports.%Main.import_ref.4aa as imports.%Main.import_ref.cb9 [from "fail_incomplete_return.carbon"] {
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   witness = imports.%Main.import_ref.7ba
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: class @C [from "fail_incomplete_return.carbon"];
 // CHECK:STDOUT:
-// CHECK:STDOUT: class @D [from "fail_incomplete_return.carbon"] {
-// CHECK:STDOUT:   complete_type_witness = imports.%Main.import_ref.8f2
+// CHECK:STDOUT: class @D.1 [from "fail_incomplete_return.carbon"] {
+// CHECK:STDOUT:   complete_type_witness = imports.%Main.import_ref.8f24d3.1
 // CHECK:STDOUT:
 // CHECK:STDOUT: !members:
-// CHECK:STDOUT:   .Self = imports.%Main.import_ref.cab
+// CHECK:STDOUT:   .Self = imports.%Main.import_ref.cabe25.1
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: class @D.2 [from "fail_incomplete_return.carbon"] {
+// CHECK:STDOUT:   complete_type_witness = imports.%Main.import_ref.8f24d3.2
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = imports.%Main.import_ref.cabe25.2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @CallFAndGIncomplete() {
@@ -269,23 +318,19 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:   %ReturnCUsed.ref: %ReturnCUsed.type = name_ref ReturnCUsed, imports.%Main.ReturnCUsed [concrete = constants.%ReturnCUsed]
 // CHECK:STDOUT:   %ReturnCUsed.call: init <error> = call %ReturnCUsed.ref()
 // CHECK:STDOUT:   %ReturnDUnused.ref: %ReturnDUnused.type = name_ref ReturnDUnused, imports.%Main.ReturnDUnused [concrete = constants.%ReturnDUnused]
-// CHECK:STDOUT:   %.loc33_17.1: ref %D = temporary_storage
-// CHECK:STDOUT:   %ReturnDUnused.call: init %D = call %ReturnDUnused.ref() to %.loc33_17.1
-// CHECK:STDOUT:   %.loc33_17.2: ref %D = temporary %.loc33_17.1, %ReturnDUnused.call
+// CHECK:STDOUT:   %.loc33_17.1: ref %D.b3dde2.1 = temporary_storage
+// CHECK:STDOUT:   %ReturnDUnused.call: init %D.b3dde2.1 = call %ReturnDUnused.ref() to %.loc33_17.1
+// CHECK:STDOUT:   %.loc33_17.2: ref %D.b3dde2.1 = temporary %.loc33_17.1, %ReturnDUnused.call
 // CHECK:STDOUT:   %ReturnDUsed.ref: %ReturnDUsed.type = name_ref ReturnDUsed, imports.%Main.ReturnDUsed [concrete = constants.%ReturnDUsed]
-// CHECK:STDOUT:   %.loc34_15.1: ref %D = temporary_storage
-// CHECK:STDOUT:   %ReturnDUsed.call: init %D = call %ReturnDUsed.ref() to %.loc34_15.1
-// CHECK:STDOUT:   %.loc34_15.2: ref %D = temporary %.loc34_15.1, %ReturnDUsed.call
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound.loc34: <bound method> = bound_method %.loc34_15.1, constants.%T.as.Destroy.impl.Op.2d4
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.1: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.2d4, @T.as.Destroy.impl.Op(constants.%D) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn]
-// CHECK:STDOUT:   %bound_method.loc34: <bound method> = bound_method %.loc34_15.1, %T.as.Destroy.impl.Op.specific_fn.1
+// CHECK:STDOUT:   %.loc34_15.1: ref %D.b3dde2.1 = temporary_storage
+// CHECK:STDOUT:   %ReturnDUsed.call: init %D.b3dde2.1 = call %ReturnDUsed.ref() to %.loc34_15.1
+// CHECK:STDOUT:   %.loc34_15.2: ref %D.b3dde2.1 = temporary %.loc34_15.1, %ReturnDUsed.call
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.bound.loc34: <bound method> = bound_method %.loc34_15.1, constants.%D.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr.loc34: %ptr.19c = addr_of %.loc34_15.1
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call.loc34: init %empty_tuple.type = call %bound_method.loc34(%addr.loc34)
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound.loc33: <bound method> = bound_method %.loc33_17.1, constants.%T.as.Destroy.impl.Op.2d4
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.2: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.2d4, @T.as.Destroy.impl.Op(constants.%D) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn]
-// CHECK:STDOUT:   %bound_method.loc33: <bound method> = bound_method %.loc33_17.1, %T.as.Destroy.impl.Op.specific_fn.2
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.call.loc34: init %empty_tuple.type = call %D.as.Destroy.impl.Op.bound.loc34(%addr.loc34)
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.bound.loc33: <bound method> = bound_method %.loc33_17.1, constants.%D.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr.loc33: %ptr.19c = addr_of %.loc33_17.1
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call.loc33: init %empty_tuple.type = call %bound_method.loc33(%addr.loc33)
+// CHECK:STDOUT:   %D.as.Destroy.impl.Op.call.loc33: init %empty_tuple.type = call %D.as.Destroy.impl.Op.bound.loc33(%addr.loc33)
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -297,3 +342,5 @@ fn CallFAndGIncomplete() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @ReturnDUsed [from "fail_incomplete_return.carbon"];
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @D.as.Destroy.impl.Op = "no_op" [from "fail_incomplete_return.carbon"];
+// CHECK:STDOUT:
@@ -912,8 +912,8 @@ import library "extern_api";
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
 // CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/parts/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
-// CHECK:STDOUT:   %Core.import_ref.a86: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0b2) = import_ref Core//prelude/parts/int, loc16_39, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.6d7)]
-// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.e36 = impl_witness_table (%Core.import_ref.a86), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
+// CHECK:STDOUT:   %Core.import_ref.a86c: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0b2) = import_ref Core//prelude/parts/int, loc16_39, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.6d7)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.e36 = impl_witness_table (%Core.import_ref.a86c), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -76,17 +76,19 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   %require_complete.6e5: <witness> = require_complete_type %ptr.79f [symbolic]
 // CHECK:STDOUT:   %Function.specific_fn.4d7: <specific function> = specific_function %Function, @Function(%ptr.79f) [symbolic]
 // CHECK:STDOUT:   %C: type = class_type @C [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.edd: <witness> = impl_witness @C.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.019: type = ptr_type %C [concrete]
+// CHECK:STDOUT:   %pattern_type.44a: type = pattern_type %ptr.019 [concrete]
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.type: type = fn_type @C.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op: %C.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
-// CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %pattern_type.c48: type = pattern_type %C [concrete]
 // CHECK:STDOUT:   %CallSpecific.type: type = fn_type @CallSpecific [concrete]
 // CHECK:STDOUT:   %CallSpecific: %CallSpecific.type = struct_value () [concrete]
 // CHECK:STDOUT:   %Function.specific_fn.1b5: <specific function> = specific_function %Function, @Function(%C) [concrete]
-// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.153: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%C) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.5d7: %T.as.Destroy.impl.Op.type.153 = struct_value () [concrete]
-// CHECK:STDOUT:   %ptr.019: type = ptr_type %C [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function %T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(%C) [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -173,9 +175,28 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @C.as.Destroy.impl: constants.%C as constants.%Destroy.type {
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.decl: %C.as.Destroy.impl.Op.type = fn_decl @C.as.Destroy.impl.Op [concrete = constants.%C.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.44a = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.44a = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc16: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.019 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
+// CHECK:STDOUT:     %self: %ptr.019 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %C.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @C.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
+// CHECK:STDOUT:   impl_decl @C.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@C.as.Destroy.impl.%C.as.Destroy.impl.Op.decl), @C.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.edd]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
-// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
 // CHECK:STDOUT:
 // CHECK:STDOUT: !members:
@@ -240,6 +261,8 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @C.as.Destroy.impl.Op(%self.param: %ptr.019) = "no_op";
+// CHECK:STDOUT:
 // CHECK:STDOUT: fn @CallSpecific(%x.param: %C) -> %return.param: %C {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %Function.ref: %Function.type = name_ref Function, file.%Function.decl [concrete = constants.%Function]
@@ -248,11 +271,9 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   %Function.specific_fn: <specific function> = specific_function %Function.ref, @Function(constants.%C) [concrete = constants.%Function.specific_fn.1b5]
 // CHECK:STDOUT:   %.loc18: ref %C = splice_block %return {}
 // CHECK:STDOUT:   %Function.call: init %C = call %Function.specific_fn(%x.ref) to %.loc18
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc18, constants.%T.as.Destroy.impl.Op.5d7
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(constants.%C) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn]
-// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %.loc18, %T.as.Destroy.impl.Op.specific_fn
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc18, constants.%C.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr: %ptr.019 = addr_of %.loc18
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method(%addr)
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.call: init %empty_tuple.type = call %C.as.Destroy.impl.Op.bound(%addr)
 // CHECK:STDOUT:   return %Function.call to %return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -288,7 +309,7 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   %pattern_type => constants.%pattern_type.c48
 // CHECK:STDOUT:
 // CHECK:STDOUT: !definition:
-// CHECK:STDOUT:   %require_complete => constants.%complete_type.357
+// CHECK:STDOUT:   %require_complete => constants.%complete_type
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: --- deduced.carbon
@@ -311,17 +332,19 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   %require_complete.6e5: <witness> = require_complete_type %ptr.79f [symbolic]
 // CHECK:STDOUT:   %Function.specific_fn.4d7: <specific function> = specific_function %Function, @Function(%ptr.79f) [symbolic]
 // CHECK:STDOUT:   %C: type = class_type @C [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.edd: <witness> = impl_witness @C.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.019: type = ptr_type %C [concrete]
+// CHECK:STDOUT:   %pattern_type.44a: type = pattern_type %ptr.019 [concrete]
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.type: type = fn_type @C.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op: %C.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
-// CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %pattern_type.c48: type = pattern_type %C [concrete]
 // CHECK:STDOUT:   %CallSpecific.type: type = fn_type @CallSpecific [concrete]
 // CHECK:STDOUT:   %CallSpecific: %CallSpecific.type = struct_value () [concrete]
 // CHECK:STDOUT:   %Function.specific_fn.1b5: <specific function> = specific_function %Function, @Function(%C) [concrete]
-// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.153: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%C) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.5d7: %T.as.Destroy.impl.Op.type.153 = struct_value () [concrete]
-// CHECK:STDOUT:   %ptr.019: type = ptr_type %C [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function %T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(%C) [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -408,9 +431,28 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @C.as.Destroy.impl: constants.%C as constants.%Destroy.type {
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.decl: %C.as.Destroy.impl.Op.type = fn_decl @C.as.Destroy.impl.Op [concrete = constants.%C.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.44a = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.44a = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc16: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.019 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
+// CHECK:STDOUT:     %self: %ptr.019 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %C.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @C.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: class @C {
+// CHECK:STDOUT:   impl_decl @C.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@C.as.Destroy.impl.%C.as.Destroy.impl.Op.decl), @C.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.edd]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
-// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
+// CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
 // CHECK:STDOUT:
 // CHECK:STDOUT: !members:
@@ -472,6 +514,8 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @C.as.Destroy.impl.Op(%self.param: %ptr.019) = "no_op";
+// CHECK:STDOUT:
 // CHECK:STDOUT: fn @CallSpecific(%x.param: %C) -> %return.param: %C {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %Function.ref: %Function.type = name_ref Function, file.%Function.decl [concrete = constants.%Function]
@@ -479,11 +523,9 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   %Function.specific_fn: <specific function> = specific_function %Function.ref, @Function(constants.%C) [concrete = constants.%Function.specific_fn.1b5]
 // CHECK:STDOUT:   %.loc18: ref %C = splice_block %return {}
 // CHECK:STDOUT:   %Function.call: init %C = call %Function.specific_fn(%x.ref) to %.loc18
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc18, constants.%T.as.Destroy.impl.Op.5d7
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(constants.%C) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn]
-// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %.loc18, %T.as.Destroy.impl.Op.specific_fn
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc18, constants.%C.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr: %ptr.019 = addr_of %.loc18
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method(%addr)
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.call: init %empty_tuple.type = call %C.as.Destroy.impl.Op.bound(%addr)
 // CHECK:STDOUT:   return %Function.call to %return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -519,6 +561,6 @@ fn CallSpecific(x: C) -> C {
 // CHECK:STDOUT:   %pattern_type => constants.%pattern_type.c48
 // CHECK:STDOUT:
 // CHECK:STDOUT: !definition:
-// CHECK:STDOUT:   %require_complete => constants.%complete_type.357
+// CHECK:STDOUT:   %require_complete => constants.%complete_type
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -53,9 +53,21 @@ fn G() {
 // CHECK:STDOUT:   %Generic.assoc_type.0fd877.1: type = assoc_entity_type @Generic, @Generic(%Scalar) [symbolic]
 // CHECK:STDOUT:   %assoc0.2966cb.1: %Generic.assoc_type.0fd877.1 = assoc_entity element0, @Generic.%Generic.F.decl [symbolic]
 // CHECK:STDOUT:   %GenericParam: type = class_type @GenericParam [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.884: <witness> = impl_witness @GenericParam.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.f73: type = ptr_type %GenericParam [concrete]
+// CHECK:STDOUT:   %pattern_type.7c3: type = pattern_type %ptr.f73 [concrete]
+// CHECK:STDOUT:   %GenericParam.as.Destroy.impl.Op.type: type = fn_type @GenericParam.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %GenericParam.as.Destroy.impl.Op: %GenericParam.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %ImplsGeneric: type = class_type @ImplsGeneric [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.9ca: <witness> = impl_witness @ImplsGeneric.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.011: type = ptr_type %ImplsGeneric [concrete]
+// CHECK:STDOUT:   %pattern_type.2db: type = pattern_type %ptr.011 [concrete]
+// CHECK:STDOUT:   %ImplsGeneric.as.Destroy.impl.Op.type: type = fn_type @ImplsGeneric.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %ImplsGeneric.as.Destroy.impl.Op: %ImplsGeneric.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %Generic.type.769: type = facet_type <@Generic, @Generic(%GenericParam)> [concrete]
 // CHECK:STDOUT:   %Self.f84: %Generic.type.769 = bind_symbolic_name Self, 1 [symbolic]
 // CHECK:STDOUT:   %Generic.F.type.4cf: type = fn_type @Generic.F, @Generic(%GenericParam) [concrete]
@@ -104,9 +116,11 @@ fn G() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Destroy = %Core.Destroy
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -191,6 +205,38 @@ fn G() {
 // CHECK:STDOUT:   witness = (%Other.G.decl)
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @GenericParam.as.Destroy.impl: constants.%GenericParam as constants.%Destroy.type {
+// CHECK:STDOUT:   %GenericParam.as.Destroy.impl.Op.decl: %GenericParam.as.Destroy.impl.Op.type = fn_decl @GenericParam.as.Destroy.impl.Op [concrete = constants.%GenericParam.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.7c3 = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.7c3 = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc19: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.f73 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%GenericParam [concrete = constants.%GenericParam]
+// CHECK:STDOUT:     %self: %ptr.f73 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %GenericParam.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @GenericParam.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: impl @ImplsGeneric.as.Destroy.impl: constants.%ImplsGeneric as constants.%Destroy.type {
+// CHECK:STDOUT:   %ImplsGeneric.as.Destroy.impl.Op.decl: %ImplsGeneric.as.Destroy.impl.Op.type = fn_decl @ImplsGeneric.as.Destroy.impl.Op [concrete = constants.%ImplsGeneric.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.2db = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.2db = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc21: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.011 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%ImplsGeneric [concrete = constants.%ImplsGeneric]
+// CHECK:STDOUT:     %self: %ptr.011 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %ImplsGeneric.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @ImplsGeneric.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: impl @ImplsGeneric.as.Generic.impl: %ImplsGeneric.ref as %Generic.type {
 // CHECK:STDOUT:   %ImplsGeneric.as.Generic.impl.F.decl: %ImplsGeneric.as.Generic.impl.F.type = fn_decl @ImplsGeneric.as.Generic.impl.F [concrete = constants.%ImplsGeneric.as.Generic.impl.F] {} {}
 // CHECK:STDOUT:
@@ -208,6 +254,9 @@ fn G() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @GenericParam {
+// CHECK:STDOUT:   impl_decl @GenericParam.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@GenericParam.as.Destroy.impl.%GenericParam.as.Destroy.impl.Op.decl), @GenericParam.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.884]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -217,6 +266,9 @@ fn G() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @ImplsGeneric {
+// CHECK:STDOUT:   impl_decl @ImplsGeneric.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@ImplsGeneric.as.Destroy.impl.%ImplsGeneric.as.Destroy.impl.Op.decl), @ImplsGeneric.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.9ca]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -229,6 +281,10 @@ fn G() {
 // CHECK:STDOUT:   fn();
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @GenericParam.as.Destroy.impl.Op(%self.param: %ptr.f73) = "no_op";
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @ImplsGeneric.as.Destroy.impl.Op(%self.param: %ptr.011) = "no_op";
+// CHECK:STDOUT:
 // CHECK:STDOUT: fn @ImplsGeneric.as.Generic.impl.F() {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   return
@@ -509,6 +509,14 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %A: type = class_type @A [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.b44: <witness> = impl_witness @A.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.6db: type = ptr_type %A [concrete]
+// CHECK:STDOUT:   %pattern_type.5f8: type = pattern_type %ptr.6db [concrete]
+// CHECK:STDOUT:   %A.as.Destroy.impl.Op.type: type = fn_type @A.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %A.as.Destroy.impl.Op: %A.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic]
@@ -517,23 +525,16 @@ fn F() {
 // CHECK:STDOUT:   %ptr.79f: type = ptr_type %T [symbolic]
 // CHECK:STDOUT:   %pattern_type.afe: type = pattern_type %ptr.79f [symbolic]
 // CHECK:STDOUT:   %ExplicitAndAlsoDeduced.type: type = fn_type @ExplicitAndAlsoDeduced [concrete]
-// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
 // CHECK:STDOUT:   %ExplicitAndAlsoDeduced: %ExplicitAndAlsoDeduced.type = struct_value () [concrete]
 // CHECK:STDOUT:   %require_complete.6e5: <witness> = require_complete_type %ptr.79f [symbolic]
 // CHECK:STDOUT:   %require_complete.4ae: <witness> = require_complete_type %T [symbolic]
 // CHECK:STDOUT:   %ExplicitAndAlsoDeduced.specific_fn.41d: <specific function> = specific_function %ExplicitAndAlsoDeduced, @ExplicitAndAlsoDeduced(%T) [symbolic]
-// CHECK:STDOUT:   %ptr.6db: type = ptr_type %A [concrete]
-// CHECK:STDOUT:   %pattern_type.5f8: type = pattern_type %ptr.6db [concrete]
 // CHECK:STDOUT:   %CallExplicitAndAlsoDeduced.type: type = fn_type @CallExplicitAndAlsoDeduced [concrete]
 // CHECK:STDOUT:   %CallExplicitAndAlsoDeduced: %CallExplicitAndAlsoDeduced.type = struct_value () [concrete]
 // CHECK:STDOUT:   %pattern_type.c10: type = pattern_type %A [concrete]
 // CHECK:STDOUT:   %ExplicitAndAlsoDeduced.specific_fn.720: <specific function> = specific_function %ExplicitAndAlsoDeduced, @ExplicitAndAlsoDeduced(%A) [concrete]
 // CHECK:STDOUT:   %A.val: %A = struct_value () [concrete]
-// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.b96: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%A) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.885: %T.as.Destroy.impl.Op.type.b96 = struct_value () [concrete]
 // CHECK:STDOUT:   %complete_type.7ea: <witness> = complete_type_witness %ptr.6db [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function %T.as.Destroy.impl.Op.885, @T.as.Destroy.impl.Op(%A) [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -581,7 +582,26 @@ fn F() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @A.as.Destroy.impl: constants.%A as constants.%Destroy.type {
+// CHECK:STDOUT:   %A.as.Destroy.impl.Op.decl: %A.as.Destroy.impl.Op.type = fn_decl @A.as.Destroy.impl.Op [concrete = constants.%A.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.5f8 = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.5f8 = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc4: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.6db = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%A [concrete = constants.%A]
+// CHECK:STDOUT:     %self: %ptr.6db = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %A.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @A.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: class @A {
+// CHECK:STDOUT:   impl_decl @A.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@A.as.Destroy.impl.%A.as.Destroy.impl.Op.decl), @A.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.b44]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -590,6 +610,8 @@ fn F() {
 // CHECK:STDOUT:   .Self = constants.%A
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @A.as.Destroy.impl.Op(%self.param: %ptr.6db) = "no_op";
+// CHECK:STDOUT:
 // CHECK:STDOUT: generic fn @ExplicitAndAlsoDeduced(%T.loc6_27.2: type) {
 // CHECK:STDOUT:   %T.loc6_27.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc6_27.1 (constants.%T)]
 // CHECK:STDOUT:   %pattern_type.loc6_37: type = pattern_type %T.loc6_27.1 [symbolic = %pattern_type.loc6_37 (constants.%pattern_type.7dc)]
@@ -628,11 +650,9 @@ fn F() {
 // CHECK:STDOUT:   %ExplicitAndAlsoDeduced.call: init %ptr.6db = call %ExplicitAndAlsoDeduced.specific_fn(%.loc11_37.6)
 // CHECK:STDOUT:   %.loc11_39.1: %ptr.6db = value_of_initializer %ExplicitAndAlsoDeduced.call
 // CHECK:STDOUT:   %.loc11_39.2: %ptr.6db = converted %ExplicitAndAlsoDeduced.call, %.loc11_39.1
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc11_37.2, constants.%T.as.Destroy.impl.Op.885
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.885, @T.as.Destroy.impl.Op(constants.%A) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn]
-// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %.loc11_37.2, %T.as.Destroy.impl.Op.specific_fn
+// CHECK:STDOUT:   %A.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc11_37.2, constants.%A.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr: %ptr.6db = addr_of %.loc11_37.2
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method(%addr)
+// CHECK:STDOUT:   %A.as.Destroy.impl.Op.call: init %empty_tuple.type = call %A.as.Destroy.impl.Op.bound(%addr)
 // CHECK:STDOUT:   return %.loc11_39.2
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -1549,8 +1569,15 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
-// CHECK:STDOUT:   %Self: %Z.type = bind_symbolic_name Self, 0 [symbolic]
+// CHECK:STDOUT:   %Self.6e6: %Z.type = bind_symbolic_name Self, 0 [symbolic]
 // CHECK:STDOUT:   %EE: type = class_type @EE [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.c99: <witness> = impl_witness @EE.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.7d7: type = ptr_type %EE [concrete]
+// CHECK:STDOUT:   %pattern_type.04a: type = pattern_type %ptr.7d7 [concrete]
+// CHECK:STDOUT:   %EE.as.Destroy.impl.Op.type: type = fn_type @EE.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %EE.as.Destroy.impl.Op: %EE.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %Z.impl_witness.354: <witness> = impl_witness file.%Z.impl_witness_table.loc6 [concrete]
@@ -1559,12 +1586,22 @@ fn F() {
 // CHECK:STDOUT:   %DD.type: type = generic_class_type @DD [concrete]
 // CHECK:STDOUT:   %DD.generic: %DD.type = struct_value () [concrete]
 // CHECK:STDOUT:   %DD.296: type = class_type @DD, @DD(%E) [symbolic]
+// CHECK:STDOUT:   %Destroy.impl_witness.63b: <witness> = impl_witness @DD.%Destroy.impl_witness_table, @DD.as.Destroy.impl(%E) [symbolic]
+// CHECK:STDOUT:   %ptr.964: type = ptr_type %DD.296 [symbolic]
+// CHECK:STDOUT:   %pattern_type.75a: type = pattern_type %ptr.964 [symbolic]
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op.type: type = fn_type @DD.as.Destroy.impl.Op, @DD.as.Destroy.impl(%E) [symbolic]
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op: %DD.as.Destroy.impl.Op.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %Z.impl_witness.c98: <witness> = impl_witness file.%Z.impl_witness_table.loc9, @DD.as.Z.impl(%E) [symbolic]
 // CHECK:STDOUT:   %D: %Z.type = bind_symbolic_name D, 0 [symbolic]
 // CHECK:STDOUT:   %pattern_type.5af: type = pattern_type %Z.type [concrete]
 // CHECK:STDOUT:   %CC.type: type = generic_class_type @CC [concrete]
 // CHECK:STDOUT:   %CC.generic: %CC.type = struct_value () [concrete]
 // CHECK:STDOUT:   %CC.a2f: type = class_type @CC, @CC(%D) [symbolic]
+// CHECK:STDOUT:   %Destroy.impl_witness.e69: <witness> = impl_witness @CC.%Destroy.impl_witness_table, @CC.as.Destroy.impl(%D) [symbolic]
+// CHECK:STDOUT:   %ptr.019: type = ptr_type %CC.a2f [symbolic]
+// CHECK:STDOUT:   %pattern_type.d71: type = pattern_type %ptr.019 [symbolic]
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op.type: type = fn_type @CC.as.Destroy.impl.Op, @CC.as.Destroy.impl(%D) [symbolic]
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op: %CC.as.Destroy.impl.Op.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %Z.lookup_impl_witness: <witness> = lookup_impl_witness %DD.296, @Z [symbolic]
 // CHECK:STDOUT:   %Z.facet.aae: %Z.type = facet_value %DD.296, (%Z.lookup_impl_witness) [symbolic]
 // CHECK:STDOUT:   %CC.23e: type = class_type @CC, @CC(%Z.facet.aae) [symbolic]
@@ -1581,9 +1618,11 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Destroy = %Core.Destroy
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -1645,18 +1684,62 @@ fn F() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: interface @Z {
-// CHECK:STDOUT:   %Self: %Z.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
+// CHECK:STDOUT:   %Self: %Z.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self.6e6]
 // CHECK:STDOUT:
 // CHECK:STDOUT: !members:
 // CHECK:STDOUT:   .Self = %Self
 // CHECK:STDOUT:   witness = ()
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @EE.as.Destroy.impl: constants.%EE as constants.%Destroy.type {
+// CHECK:STDOUT:   %EE.as.Destroy.impl.Op.decl: %EE.as.Destroy.impl.Op.type = fn_decl @EE.as.Destroy.impl.Op [concrete = constants.%EE.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.04a = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.04a = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc5: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.7d7 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%EE [concrete = constants.%EE]
+// CHECK:STDOUT:     %self: %ptr.7d7 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %EE.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @EE.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: impl @EE.as.Z.impl: %EE.ref as %Z.ref {
 // CHECK:STDOUT: !members:
 // CHECK:STDOUT:   witness = file.%Z.impl_witness.loc6
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @DD.as.Destroy.impl(@DD.%E.loc8_10.2: type) {
+// CHECK:STDOUT:   %E: type = bind_symbolic_name E, 0 [symbolic = %E (constants.%E)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @DD.%Destroy.impl_witness_table, @DD.as.Destroy.impl(%E) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.63b)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op.type: type = fn_type @DD.as.Destroy.impl.Op, @DD.as.Destroy.impl(%E) [symbolic = %DD.as.Destroy.impl.Op.type (constants.%DD.as.Destroy.impl.Op.type)]
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op: @DD.as.Destroy.impl.%DD.as.Destroy.impl.Op.type (%DD.as.Destroy.impl.Op.type) = struct_value () [symbolic = %DD.as.Destroy.impl.Op (constants.%DD.as.Destroy.impl.Op)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: constants.%DD.296 as constants.%Destroy.type {
+// CHECK:STDOUT:     %DD.as.Destroy.impl.Op.decl: @DD.as.Destroy.impl.%DD.as.Destroy.impl.Op.type (%DD.as.Destroy.impl.Op.type) = fn_decl @DD.as.Destroy.impl.Op [symbolic = @DD.as.Destroy.impl.%DD.as.Destroy.impl.Op (constants.%DD.as.Destroy.impl.Op)] {
+// CHECK:STDOUT:       %self.patt: @DD.as.Destroy.impl.Op.%pattern_type (%pattern_type.75a) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @DD.as.Destroy.impl.Op.%pattern_type (%pattern_type.75a) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %.loc8_20.1: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %self.param: @DD.as.Destroy.impl.Op.%ptr (%ptr.964) = value_param call_param0
+// CHECK:STDOUT:       %.loc8_20.2: type = splice_block %Self.ref [symbolic = %DD (constants.%DD.296)] {
+// CHECK:STDOUT:         %.loc8_20.3: type = specific_constant constants.%DD.296, @DD(constants.%E) [symbolic = %DD (constants.%DD.296)]
+// CHECK:STDOUT:         %Self.ref: type = name_ref Self, %.loc8_20.3 [symbolic = %DD (constants.%DD.296)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @DD.as.Destroy.impl.Op.%ptr (%ptr.964) = bind_name self, %self.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %DD.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:     witness = @DD.%Destroy.impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: generic impl @DD.as.Z.impl(%E.loc9_14.1: type) {
 // CHECK:STDOUT:   %E.loc9_14.2: type = bind_symbolic_name E, 0 [symbolic = %E.loc9_14.2 (constants.%E)]
 // CHECK:STDOUT:   %DD.loc9_28.2: type = class_type @DD, @DD(%E.loc9_14.2) [symbolic = %DD.loc9_28.2 (constants.%DD.296)]
@@ -1670,6 +1753,34 @@ fn F() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @CC.as.Destroy.impl(@CC.%D.loc11_10.2: %Z.type) {
+// CHECK:STDOUT:   %D: %Z.type = bind_symbolic_name D, 0 [symbolic = %D (constants.%D)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @CC.%Destroy.impl_witness_table, @CC.as.Destroy.impl(%D) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.e69)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op.type: type = fn_type @CC.as.Destroy.impl.Op, @CC.as.Destroy.impl(%D) [symbolic = %CC.as.Destroy.impl.Op.type (constants.%CC.as.Destroy.impl.Op.type)]
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op: @CC.as.Destroy.impl.%CC.as.Destroy.impl.Op.type (%CC.as.Destroy.impl.Op.type) = struct_value () [symbolic = %CC.as.Destroy.impl.Op (constants.%CC.as.Destroy.impl.Op)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: constants.%CC.a2f as constants.%Destroy.type {
+// CHECK:STDOUT:     %CC.as.Destroy.impl.Op.decl: @CC.as.Destroy.impl.%CC.as.Destroy.impl.Op.type (%CC.as.Destroy.impl.Op.type) = fn_decl @CC.as.Destroy.impl.Op [symbolic = @CC.as.Destroy.impl.%CC.as.Destroy.impl.Op (constants.%CC.as.Destroy.impl.Op)] {
+// CHECK:STDOUT:       %self.patt: @CC.as.Destroy.impl.Op.%pattern_type (%pattern_type.d71) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @CC.as.Destroy.impl.Op.%pattern_type (%pattern_type.d71) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %.loc11_17.1: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %self.param: @CC.as.Destroy.impl.Op.%ptr (%ptr.019) = value_param call_param0
+// CHECK:STDOUT:       %.loc11_17.2: type = splice_block %Self.ref [symbolic = %CC (constants.%CC.a2f)] {
+// CHECK:STDOUT:         %.loc11_17.3: type = specific_constant constants.%CC.a2f, @CC(constants.%D) [symbolic = %CC (constants.%CC.a2f)]
+// CHECK:STDOUT:         %Self.ref: type = name_ref Self, %.loc11_17.3 [symbolic = %CC (constants.%CC.a2f)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @CC.as.Destroy.impl.Op.%ptr (%ptr.019) = bind_name self, %self.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %CC.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:     witness = @CC.%Destroy.impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: generic impl @CC.as.Z.impl(%E.loc12_14.1: type) {
 // CHECK:STDOUT:   %E.loc12_14.2: type = bind_symbolic_name E, 0 [symbolic = %E.loc12_14.2 (constants.%E)]
 // CHECK:STDOUT:   %DD.loc12_31.2: type = class_type @DD, @DD(%E.loc12_14.2) [symbolic = %DD.loc12_31.2 (constants.%DD.296)]
@@ -1687,6 +1798,9 @@ fn F() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @EE {
+// CHECK:STDOUT:   impl_decl @EE.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@EE.as.Destroy.impl.%EE.as.Destroy.impl.Op.decl), @EE.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.c99]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -1701,6 +1815,9 @@ fn F() {
 // CHECK:STDOUT: !definition:
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
+// CHECK:STDOUT:     impl_decl @DD.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:     %Destroy.impl_witness_table = impl_witness_table (@DD.as.Destroy.impl.%DD.as.Destroy.impl.Op.decl), @DD.as.Destroy.impl [concrete]
+// CHECK:STDOUT:     %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table, @DD.as.Destroy.impl(constants.%E) [symbolic = @DD.as.Destroy.impl.%Destroy.impl_witness (constants.%Destroy.impl_witness.63b)]
 // CHECK:STDOUT:     %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
@@ -1716,6 +1833,9 @@ fn F() {
 // CHECK:STDOUT: !definition:
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
+// CHECK:STDOUT:     impl_decl @CC.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:     %Destroy.impl_witness_table = impl_witness_table (@CC.as.Destroy.impl.%CC.as.Destroy.impl.Op.decl), @CC.as.Destroy.impl [concrete]
+// CHECK:STDOUT:     %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table, @CC.as.Destroy.impl(constants.%D) [symbolic = @CC.as.Destroy.impl.%Destroy.impl_witness (constants.%Destroy.impl_witness.e69)]
 // CHECK:STDOUT:     %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
@@ -1725,6 +1845,30 @@ fn F() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @EE.as.Destroy.impl.Op(%self.param: %ptr.7d7) = "no_op";
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @DD.as.Destroy.impl.Op(@DD.%E.loc8_10.2: type) {
+// CHECK:STDOUT:   %E: type = bind_symbolic_name E, 0 [symbolic = %E (constants.%E)]
+// CHECK:STDOUT:   %DD: type = class_type @DD, @DD(%E) [symbolic = %DD (constants.%DD.296)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %DD [symbolic = %ptr (constants.%ptr.964)]
+// CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr [symbolic = %pattern_type (constants.%pattern_type.75a)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @DD.as.Destroy.impl.Op.%ptr (%ptr.964)) = "no_op";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @CC.as.Destroy.impl.Op(@CC.%D.loc11_10.2: %Z.type) {
+// CHECK:STDOUT:   %D: %Z.type = bind_symbolic_name D, 0 [symbolic = %D (constants.%D)]
+// CHECK:STDOUT:   %CC: type = class_type @CC, @CC(%D) [symbolic = %CC (constants.%CC.a2f)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %CC [symbolic = %ptr (constants.%ptr.019)]
+// CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr [symbolic = %pattern_type (constants.%pattern_type.d71)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @CC.as.Destroy.impl.Op.%ptr (%ptr.019)) = "no_op";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %CC.ref: %CC.type = name_ref CC, file.%CC.decl [concrete = constants.%CC.generic]
@@ -1744,6 +1888,18 @@ fn F() {
 // CHECK:STDOUT:   %E.loc8_10.1 => constants.%E
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: specific @DD.as.Destroy.impl(constants.%E) {
+// CHECK:STDOUT:   %E => constants.%E
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.63b
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @DD.as.Destroy.impl.Op(constants.%E) {
+// CHECK:STDOUT:   %E => constants.%E
+// CHECK:STDOUT:   %DD => constants.%DD.296
+// CHECK:STDOUT:   %ptr => constants.%ptr.964
+// CHECK:STDOUT:   %pattern_type => constants.%pattern_type.75a
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: specific @DD.as.Z.impl(constants.%E) {
 // CHECK:STDOUT:   %E.loc9_14.2 => constants.%E
 // CHECK:STDOUT:   %DD.loc9_28.2 => constants.%DD.296
@@ -1756,6 +1912,18 @@ fn F() {
 // CHECK:STDOUT:   %D.loc11_10.1 => constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: specific @CC.as.Destroy.impl(constants.%D) {
+// CHECK:STDOUT:   %D => constants.%D
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.e69
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @CC.as.Destroy.impl.Op(constants.%D) {
+// CHECK:STDOUT:   %D => constants.%D
+// CHECK:STDOUT:   %CC => constants.%CC.a2f
+// CHECK:STDOUT:   %ptr => constants.%ptr.019
+// CHECK:STDOUT:   %pattern_type => constants.%pattern_type.d71
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: specific @CC(constants.%Z.facet.aae) {
 // CHECK:STDOUT:   %D.loc11_10.1 => constants.%Z.facet.aae
 // CHECK:STDOUT: }
@@ -45,6 +45,13 @@ fn F() {
 // CHECK:STDOUT:   %W.type: type = facet_type <@W> [concrete]
 // CHECK:STDOUT:   %Self.f12: %W.type = bind_symbolic_name Self, 0 [symbolic]
 // CHECK:STDOUT:   %DD: type = class_type @DD [concrete]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.147: <witness> = impl_witness @DD.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.3d1: type = ptr_type %DD [concrete]
+// CHECK:STDOUT:   %pattern_type.3fc: type = pattern_type %ptr.3d1 [concrete]
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op.type: type = fn_type @DD.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op: %DD.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %Y.impl_witness: <witness> = impl_witness file.%Y.impl_witness_table [concrete]
@@ -54,6 +61,11 @@ fn F() {
 // CHECK:STDOUT:   %CC.type: type = generic_class_type @CC [concrete]
 // CHECK:STDOUT:   %CC.generic: %CC.type = struct_value () [concrete]
 // CHECK:STDOUT:   %CC.3ba: type = class_type @CC, @CC(%D) [symbolic]
+// CHECK:STDOUT:   %Destroy.impl_witness.a11: <witness> = impl_witness @CC.%Destroy.impl_witness_table, @CC.as.Destroy.impl(%D) [symbolic]
+// CHECK:STDOUT:   %ptr.423: type = ptr_type %CC.3ba [symbolic]
+// CHECK:STDOUT:   %pattern_type.1ed: type = pattern_type %ptr.423 [symbolic]
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op.type: type = fn_type @CC.as.Destroy.impl.Op, @CC.as.Destroy.impl(%D) [symbolic]
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op: %CC.as.Destroy.impl.Op.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %Z.type: type = facet_type <@Z> [concrete]
 // CHECK:STDOUT:   %Self.6e6: %Z.type = bind_symbolic_name Self, 0 [symbolic]
 // CHECK:STDOUT:   %BitAndWith.type.f2e: type = generic_interface_type @BitAndWith [concrete]
@@ -85,10 +97,12 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Destroy = %Core.Destroy
 // CHECK:STDOUT:     .BitAndWith = %Core.BitAndWith
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
 // CHECK:STDOUT:   %Core.BitAndWith: %BitAndWith.type.f2e = import_ref Core//prelude, BitAndWith, loaded [concrete = constants.%BitAndWith.generic]
 // CHECK:STDOUT:   %Core.import_ref.012: %type.as.BitAndWith.impl.Op.type = import_ref Core//prelude, loc13_42, loaded [concrete = constants.%type.as.BitAndWith.impl.Op]
 // CHECK:STDOUT:   %BitAndWith.impl_witness_table = impl_witness_table (%Core.import_ref.012), @type.as.BitAndWith.impl [concrete]
@@ -177,6 +191,22 @@ fn F() {
 // CHECK:STDOUT:   witness = ()
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: impl @DD.as.Destroy.impl: constants.%DD as constants.%Destroy.type {
+// CHECK:STDOUT:   %DD.as.Destroy.impl.Op.decl: %DD.as.Destroy.impl.Op.type = fn_decl @DD.as.Destroy.impl.Op [concrete = constants.%DD.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.3fc = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.3fc = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc7: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.3d1 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%DD [concrete = constants.%DD]
+// CHECK:STDOUT:     %self: %ptr.3d1 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %DD.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @DD.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: impl @DD.as.Y.impl: %DD.ref as %Y.ref {
 // CHECK:STDOUT: !members:
 // CHECK:STDOUT:   witness = file.%Y.impl_witness
@@ -187,6 +217,34 @@ fn F() {
 // CHECK:STDOUT:   witness = file.%W.impl_witness
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @CC.as.Destroy.impl(@CC.%D.loc12_10.2: %Y.type) {
+// CHECK:STDOUT:   %D: %Y.type = bind_symbolic_name D, 0 [symbolic = %D (constants.%D)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @CC.%Destroy.impl_witness_table, @CC.as.Destroy.impl(%D) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.a11)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op.type: type = fn_type @CC.as.Destroy.impl.Op, @CC.as.Destroy.impl(%D) [symbolic = %CC.as.Destroy.impl.Op.type (constants.%CC.as.Destroy.impl.Op.type)]
+// CHECK:STDOUT:   %CC.as.Destroy.impl.Op: @CC.as.Destroy.impl.%CC.as.Destroy.impl.Op.type (%CC.as.Destroy.impl.Op.type) = struct_value () [symbolic = %CC.as.Destroy.impl.Op (constants.%CC.as.Destroy.impl.Op)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: constants.%CC.3ba as constants.%Destroy.type {
+// CHECK:STDOUT:     %CC.as.Destroy.impl.Op.decl: @CC.as.Destroy.impl.%CC.as.Destroy.impl.Op.type (%CC.as.Destroy.impl.Op.type) = fn_decl @CC.as.Destroy.impl.Op [symbolic = @CC.as.Destroy.impl.%CC.as.Destroy.impl.Op (constants.%CC.as.Destroy.impl.Op)] {
+// CHECK:STDOUT:       %self.patt: @CC.as.Destroy.impl.Op.%pattern_type (%pattern_type.1ed) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @CC.as.Destroy.impl.Op.%pattern_type (%pattern_type.1ed) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %.loc12_17.1: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %self.param: @CC.as.Destroy.impl.Op.%ptr (%ptr.423) = value_param call_param0
+// CHECK:STDOUT:       %.loc12_17.2: type = splice_block %Self.ref [symbolic = %CC (constants.%CC.3ba)] {
+// CHECK:STDOUT:         %.loc12_17.3: type = specific_constant constants.%CC.3ba, @CC(constants.%D) [symbolic = %CC (constants.%CC.3ba)]
+// CHECK:STDOUT:         %Self.ref: type = name_ref Self, %.loc12_17.3 [symbolic = %CC (constants.%CC.3ba)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @CC.as.Destroy.impl.Op.%ptr (%ptr.423) = bind_name self, %self.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %CC.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:     witness = @CC.%Destroy.impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: generic impl @CC.as.Z.impl(%E.loc19_14.1: %facet_type) {
 // CHECK:STDOUT:   %E.loc19_14.2: %facet_type = bind_symbolic_name E, 0 [symbolic = %E.loc19_14.2 (constants.%E)]
 // CHECK:STDOUT:   %Y.lookup_impl_witness: <witness> = lookup_impl_witness %E.loc19_14.2, @Y [symbolic = %Y.lookup_impl_witness (constants.%Y.lookup_impl_witness)]
@@ -204,6 +262,9 @@ fn F() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: class @DD {
+// CHECK:STDOUT:   impl_decl @DD.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@DD.as.Destroy.impl.%DD.as.Destroy.impl.Op.decl), @DD.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.147]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -218,6 +279,9 @@ fn F() {
 // CHECK:STDOUT: !definition:
 // CHECK:STDOUT:
 // CHECK:STDOUT:   class {
+// CHECK:STDOUT:     impl_decl @CC.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:     %Destroy.impl_witness_table = impl_witness_table (@CC.as.Destroy.impl.%CC.as.Destroy.impl.Op.decl), @CC.as.Destroy.impl [concrete]
+// CHECK:STDOUT:     %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table, @CC.as.Destroy.impl(constants.%D) [symbolic = @CC.as.Destroy.impl.%Destroy.impl_witness (constants.%Destroy.impl_witness.a11)]
 // CHECK:STDOUT:     %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
@@ -227,6 +291,19 @@ fn F() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: fn @DD.as.Destroy.impl.Op(%self.param: %ptr.3d1) = "no_op";
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @CC.as.Destroy.impl.Op(@CC.%D.loc12_10.2: %Y.type) {
+// CHECK:STDOUT:   %D: %Y.type = bind_symbolic_name D, 0 [symbolic = %D (constants.%D)]
+// CHECK:STDOUT:   %CC: type = class_type @CC, @CC(%D) [symbolic = %CC (constants.%CC.3ba)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %CC [symbolic = %ptr (constants.%ptr.423)]
+// CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr [symbolic = %pattern_type (constants.%pattern_type.1ed)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @CC.as.Destroy.impl.Op.%ptr (%ptr.423)) = "no_op";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %CC.ref: %CC.type = name_ref CC, file.%CC.decl [concrete = constants.%CC.generic]
@@ -246,6 +323,18 @@ fn F() {
 // CHECK:STDOUT:   %D.loc12_10.1 => constants.%D
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: specific @CC.as.Destroy.impl(constants.%D) {
+// CHECK:STDOUT:   %D => constants.%D
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.a11
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @CC.as.Destroy.impl.Op(constants.%D) {
+// CHECK:STDOUT:   %D => constants.%D
+// CHECK:STDOUT:   %CC => constants.%CC.3ba
+// CHECK:STDOUT:   %ptr => constants.%ptr.423
+// CHECK:STDOUT:   %pattern_type => constants.%pattern_type.1ed
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: specific @CC(constants.%Y.facet.7ec) {
 // CHECK:STDOUT:   %D.loc12_10.1 => constants.%Y.facet.7ec
 // CHECK:STDOUT: }
@@ -40,8 +40,8 @@ fn F(N:! i32, a: array(i32, N)*);
 // CHECK:STDOUT:   %bound_method: <bound method> = bound_method %N.51e, %Int.as.ImplicitAs.impl.Convert.specific_fn [symbolic]
 // CHECK:STDOUT:   %Int.as.ImplicitAs.impl.Convert.call: init Core.IntLiteral = call %bound_method(%N.51e) [symbolic]
 // CHECK:STDOUT:   %array_type: type = array_type %Int.as.ImplicitAs.impl.Convert.call, %i32 [symbolic]
-// CHECK:STDOUT:   %ptr: type = ptr_type %array_type [symbolic]
-// CHECK:STDOUT:   %pattern_type.c7e: type = pattern_type %ptr [symbolic]
+// CHECK:STDOUT:   %ptr.0ad: type = ptr_type %array_type [symbolic]
+// CHECK:STDOUT:   %pattern_type.c7e: type = pattern_type %ptr.0ad [symbolic]
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
 // CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
 // CHECK:STDOUT: }
@@ -75,8 +75,8 @@ fn F(N:! i32, a: array(i32, N)*);
 // CHECK:STDOUT:       %i32.loc15_10: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %N.loc15_6.2: %i32 = bind_symbolic_name N, 0 [symbolic = %N.loc15_6.1 (constants.%N.51e)]
-// CHECK:STDOUT:     %a.param: @F.%ptr.loc15_31.1 (%ptr) = value_param call_param0
-// CHECK:STDOUT:     %.loc15_31: type = splice_block %ptr.loc15_31.2 [symbolic = %ptr.loc15_31.1 (constants.%ptr)] {
+// CHECK:STDOUT:     %a.param: @F.%ptr.loc15_31.1 (%ptr.0ad) = value_param call_param0
+// CHECK:STDOUT:     %.loc15_31: type = splice_block %ptr.loc15_31.2 [symbolic = %ptr.loc15_31.1 (constants.%ptr.0ad)] {
 // CHECK:STDOUT:       %int_32.loc15_24: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
 // CHECK:STDOUT:       %i32.loc15_24: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
 // CHECK:STDOUT:       %N.ref: %i32 = name_ref N, %N.loc15_6.2 [symbolic = %N.loc15_6.1 (constants.%N.51e)]
@@ -88,9 +88,9 @@ fn F(N:! i32, a: array(i32, N)*);
 // CHECK:STDOUT:       %.loc15_29.1: Core.IntLiteral = value_of_initializer %Int.as.ImplicitAs.impl.Convert.call.loc15_29.2 [symbolic = %Int.as.ImplicitAs.impl.Convert.call.loc15_29.1 (constants.%Int.as.ImplicitAs.impl.Convert.call)]
 // CHECK:STDOUT:       %.loc15_29.2: Core.IntLiteral = converted %N.ref, %.loc15_29.1 [symbolic = %Int.as.ImplicitAs.impl.Convert.call.loc15_29.1 (constants.%Int.as.ImplicitAs.impl.Convert.call)]
 // CHECK:STDOUT:       %array_type.loc15_30.2: type = array_type %.loc15_29.2, %i32.loc15_24 [symbolic = %array_type.loc15_30.1 (constants.%array_type)]
-// CHECK:STDOUT:       %ptr.loc15_31.2: type = ptr_type %array_type.loc15_30.2 [symbolic = %ptr.loc15_31.1 (constants.%ptr)]
+// CHECK:STDOUT:       %ptr.loc15_31.2: type = ptr_type %array_type.loc15_30.2 [symbolic = %ptr.loc15_31.1 (constants.%ptr.0ad)]
 // CHECK:STDOUT:     }
-// CHECK:STDOUT:     %a: @F.%ptr.loc15_31.1 (%ptr) = bind_name a, %a.param
+// CHECK:STDOUT:     %a: @F.%ptr.loc15_31.1 (%ptr.0ad) = bind_name a, %a.param
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -100,10 +100,10 @@ fn F(N:! i32, a: array(i32, N)*);
 // CHECK:STDOUT:   %bound_method.loc15_29.1: <bound method> = bound_method %N.loc15_6.1, constants.%Int.as.ImplicitAs.impl.Convert.specific_fn [symbolic = %bound_method.loc15_29.1 (constants.%bound_method)]
 // CHECK:STDOUT:   %Int.as.ImplicitAs.impl.Convert.call.loc15_29.1: init Core.IntLiteral = call %bound_method.loc15_29.1(%N.loc15_6.1) [symbolic = %Int.as.ImplicitAs.impl.Convert.call.loc15_29.1 (constants.%Int.as.ImplicitAs.impl.Convert.call)]
 // CHECK:STDOUT:   %array_type.loc15_30.1: type = array_type %Int.as.ImplicitAs.impl.Convert.call.loc15_29.1, constants.%i32 [symbolic = %array_type.loc15_30.1 (constants.%array_type)]
-// CHECK:STDOUT:   %ptr.loc15_31.1: type = ptr_type %array_type.loc15_30.1 [symbolic = %ptr.loc15_31.1 (constants.%ptr)]
+// CHECK:STDOUT:   %ptr.loc15_31.1: type = ptr_type %array_type.loc15_30.1 [symbolic = %ptr.loc15_31.1 (constants.%ptr.0ad)]
 // CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr.loc15_31.1 [symbolic = %pattern_type (constants.%pattern_type.c7e)]
 // CHECK:STDOUT:
-// CHECK:STDOUT:   fn(%a.param: @F.%ptr.loc15_31.1 (%ptr));
+// CHECK:STDOUT:   fn(%a.param: @F.%ptr.loc15_31.1 (%ptr.0ad));
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: specific @F(constants.%N.51e) {
@@ -112,7 +112,7 @@ fn F(N:! i32, a: array(i32, N)*);
 // CHECK:STDOUT:   %bound_method.loc15_29.1 => constants.%bound_method
 // CHECK:STDOUT:   %Int.as.ImplicitAs.impl.Convert.call.loc15_29.1 => constants.%Int.as.ImplicitAs.impl.Convert.call
 // CHECK:STDOUT:   %array_type.loc15_30.1 => constants.%array_type
-// CHECK:STDOUT:   %ptr.loc15_31.1 => constants.%ptr
+// CHECK:STDOUT:   %ptr.loc15_31.1 => constants.%ptr.0ad
 // CHECK:STDOUT:   %pattern_type => constants.%pattern_type.c7e
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -55,16 +55,14 @@ fn CallNegative() {
 // CHECK:STDOUT:   %pattern_type.8963eb.1: type = pattern_type %Int.49d0e6.1 [symbolic]
 // CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
 // CHECK:STDOUT:   %Destroy.Op.type: type = fn_type @Destroy.Op [concrete]
-// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.bc9: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%T) [symbolic]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.46f: %T.as.Destroy.impl.Op.type.bc9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %Destroy.impl_witness.543: <witness> = impl_witness imports.%Destroy.impl_witness_table.72b, @Int.as.Destroy.impl(%N) [symbolic]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.type.733: type = fn_type @Int.as.Destroy.impl.Op, @Int.as.Destroy.impl(%N) [symbolic]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.011: %Int.as.Destroy.impl.Op.type.733 = struct_value () [symbolic]
 // CHECK:STDOUT:   %ptr.784: type = ptr_type %Int.49d0e6.1 [symbolic]
+// CHECK:STDOUT:   %Destroy.facet.abb: %Destroy.type = facet_value %Int.49d0e6.1, (%Destroy.impl_witness.543) [symbolic]
+// CHECK:STDOUT:   %.94a: type = fn_type_with_self_type %Destroy.Op.type, %Destroy.facet.abb [symbolic]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.specific_fn.1f5: <specific function> = specific_function %Int.as.Destroy.impl.Op.011, @Int.as.Destroy.impl.Op(%N) [symbolic]
 // CHECK:STDOUT:   %require_complete.0f5: <witness> = require_complete_type %ptr.784 [symbolic]
-// CHECK:STDOUT:   %Destroy.lookup_impl_witness: <witness> = lookup_impl_witness %Int.49d0e6.1, @Destroy [symbolic]
-// CHECK:STDOUT:   %Destroy.facet.13d: %Destroy.type = facet_value %Int.49d0e6.1, (%Destroy.lookup_impl_witness) [symbolic]
-// CHECK:STDOUT:   %.bbc: type = fn_type_with_self_type %Destroy.Op.type, %Destroy.facet.13d [symbolic]
-// CHECK:STDOUT:   %impl.elem0.fe8: %.bbc = impl_witness_access %Destroy.lookup_impl_witness, element0 [symbolic]
-// CHECK:STDOUT:   %specific_impl_fn: <specific function> = specific_impl_function %impl.elem0.fe8, @Destroy.Op(%Destroy.facet.13d) [symbolic]
 // CHECK:STDOUT:   %CallNegative.type: type = fn_type @CallNegative [concrete]
 // CHECK:STDOUT:   %CallNegative: %CallNegative.type = struct_value () [concrete]
 // CHECK:STDOUT:   %int_0: Core.IntLiteral = int_value 0 [concrete]
@@ -72,14 +70,14 @@ fn CallNegative() {
 // CHECK:STDOUT:   %i0: type = class_type @Int, @Int(%int_0) [concrete]
 // CHECK:STDOUT:   %complete_type.d94: <witness> = complete_type_witness <error> [concrete]
 // CHECK:STDOUT:   %pattern_type.47b: type = pattern_type %i0 [concrete]
-// CHECK:STDOUT:   %Destroy.impl_witness.404: <witness> = impl_witness imports.%Destroy.impl_witness_table, @T.as.Destroy.impl(%i0) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.1c2: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%i0) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.912: %T.as.Destroy.impl.Op.type.1c2 = struct_value () [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.951: <witness> = impl_witness imports.%Destroy.impl_witness_table.72b, @Int.as.Destroy.impl(%int_0) [concrete]
+// CHECK:STDOUT:   %Destroy.facet.4e0: %Destroy.type = facet_value %i0, (%Destroy.impl_witness.951) [concrete]
+// CHECK:STDOUT:   %.53d: type = fn_type_with_self_type %Destroy.Op.type, %Destroy.facet.4e0 [concrete]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.type.be2: type = fn_type @Int.as.Destroy.impl.Op, @Int.as.Destroy.impl(%int_0) [concrete]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.a22: %Int.as.Destroy.impl.Op.type.be2 = struct_value () [concrete]
 // CHECK:STDOUT:   %ptr.3f1: type = ptr_type %i0 [concrete]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.specific_fn.f1a: <specific function> = specific_function %Int.as.Destroy.impl.Op.a22, @Int.as.Destroy.impl.Op(%int_0) [concrete]
 // CHECK:STDOUT:   %complete_type.588: <witness> = complete_type_witness %ptr.3f1 [concrete]
-// CHECK:STDOUT:   %Destroy.facet.973: %Destroy.type = facet_value %i0, (%Destroy.impl_witness.404) [concrete]
-// CHECK:STDOUT:   %.9ab: type = fn_type_with_self_type %Destroy.Op.type, %Destroy.facet.973 [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function %T.as.Destroy.impl.Op.912, @T.as.Destroy.impl.Op(%i0) [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
@@ -93,8 +91,8 @@ fn CallNegative() {
 // CHECK:STDOUT:   %Core.IntLiteral: %IntLiteral.type = import_ref Core//prelude/parts/int_literal, IntLiteral, loaded [concrete = constants.%IntLiteral]
 // CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
 // CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
-// CHECK:STDOUT:   %Core.import_ref.0b9: @T.as.Destroy.impl.%T.as.Destroy.impl.Op.type (%T.as.Destroy.impl.Op.type.bc9) = import_ref Core//prelude/parts/destroy, loc8_29, loaded [symbolic = @T.as.Destroy.impl.%T.as.Destroy.impl.Op (constants.%T.as.Destroy.impl.Op.46f)]
-// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (%Core.import_ref.0b9), @T.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Core.import_ref.f64: @Int.as.Destroy.impl.%Int.as.Destroy.impl.Op.type (%Int.as.Destroy.impl.Op.type.733) = import_ref Core//prelude/parts/int, loc9_29, loaded [symbolic = @Int.as.Destroy.impl.%Int.as.Destroy.impl.Op (constants.%Int.as.Destroy.impl.Op.011)]
+// CHECK:STDOUT:   %Destroy.impl_witness_table.72b = impl_witness_table (%Core.import_ref.f64), @Int.as.Destroy.impl [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -126,11 +124,12 @@ fn CallNegative() {
 // CHECK:STDOUT:   %Int.loc12_20.2: type = class_type @Int, @Int(%N.loc4_19.1) [symbolic = %Int.loc12_20.2 (constants.%Int.49d0e6.1)]
 // CHECK:STDOUT:   %require_complete.loc12_20: <witness> = require_complete_type %Int.loc12_20.2 [symbolic = %require_complete.loc12_20 (constants.%require_complete.b4f426.1)]
 // CHECK:STDOUT:   %pattern_type: type = pattern_type %Int.loc12_20.2 [symbolic = %pattern_type (constants.%pattern_type.8963eb.1)]
-// CHECK:STDOUT:   %Destroy.lookup_impl_witness: <witness> = lookup_impl_witness %Int.loc12_20.2, @Destroy [symbolic = %Destroy.lookup_impl_witness (constants.%Destroy.lookup_impl_witness)]
-// CHECK:STDOUT:   %Destroy.facet: %Destroy.type = facet_value %Int.loc12_20.2, (%Destroy.lookup_impl_witness) [symbolic = %Destroy.facet (constants.%Destroy.facet.13d)]
-// CHECK:STDOUT:   %.loc12_3.2: type = fn_type_with_self_type constants.%Destroy.Op.type, %Destroy.facet [symbolic = %.loc12_3.2 (constants.%.bbc)]
-// CHECK:STDOUT:   %impl.elem0.loc12_3.2: @ErrorIfNIsZero.%.loc12_3.2 (%.bbc) = impl_witness_access %Destroy.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc12_3.2 (constants.%impl.elem0.fe8)]
-// CHECK:STDOUT:   %specific_impl_fn.loc12_3.2: <specific function> = specific_impl_function %impl.elem0.loc12_3.2, @Destroy.Op(%Destroy.facet) [symbolic = %specific_impl_fn.loc12_3.2 (constants.%specific_impl_fn)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness imports.%Destroy.impl_witness_table.72b, @Int.as.Destroy.impl(%N.loc4_19.1) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.543)]
+// CHECK:STDOUT:   %Destroy.facet: %Destroy.type = facet_value %Int.loc12_20.2, (%Destroy.impl_witness) [symbolic = %Destroy.facet (constants.%Destroy.facet.abb)]
+// CHECK:STDOUT:   %.loc12_3: type = fn_type_with_self_type constants.%Destroy.Op.type, %Destroy.facet [symbolic = %.loc12_3 (constants.%.94a)]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.type: type = fn_type @Int.as.Destroy.impl.Op, @Int.as.Destroy.impl(%N.loc4_19.1) [symbolic = %Int.as.Destroy.impl.Op.type (constants.%Int.as.Destroy.impl.Op.type.733)]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op: @ErrorIfNIsZero.%Int.as.Destroy.impl.Op.type (%Int.as.Destroy.impl.Op.type.733) = struct_value () [symbolic = %Int.as.Destroy.impl.Op (constants.%Int.as.Destroy.impl.Op.011)]
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Destroy.impl.Op, @Int.as.Destroy.impl.Op(%N.loc4_19.1) [symbolic = %Int.as.Destroy.impl.Op.specific_fn (constants.%Int.as.Destroy.impl.Op.specific_fn.1f5)]
 // CHECK:STDOUT:   %ptr: type = ptr_type %Int.loc12_20.2 [symbolic = %ptr (constants.%ptr.784)]
 // CHECK:STDOUT:   %require_complete.loc12_3: <witness> = require_complete_type %ptr [symbolic = %require_complete.loc12_3 (constants.%require_complete.0f5)]
 // CHECK:STDOUT:
@@ -148,12 +147,12 @@ fn CallNegative() {
 // CHECK:STDOUT:       %Int.loc12_20.1: type = class_type @Int, @Int(constants.%N) [symbolic = %Int.loc12_20.2 (constants.%Int.49d0e6.1)]
 // CHECK:STDOUT:     }
 // CHECK:STDOUT:     %v: ref @ErrorIfNIsZero.%Int.loc12_20.2 (%Int.49d0e6.1) = bind_name v, %v.var
-// CHECK:STDOUT:     %impl.elem0.loc12_3.1: @ErrorIfNIsZero.%.loc12_3.2 (%.bbc) = impl_witness_access constants.%Destroy.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc12_3.2 (constants.%impl.elem0.fe8)]
-// CHECK:STDOUT:     %bound_method.loc12_3.1: <bound method> = bound_method %v.var, %impl.elem0.loc12_3.1
-// CHECK:STDOUT:     %specific_impl_fn.loc12_3.1: <specific function> = specific_impl_function %impl.elem0.loc12_3.1, @Destroy.Op(constants.%Destroy.facet.13d) [symbolic = %specific_impl_fn.loc12_3.2 (constants.%specific_impl_fn)]
-// CHECK:STDOUT:     %bound_method.loc12_3.2: <bound method> = bound_method %v.var, %specific_impl_fn.loc12_3.1
+// CHECK:STDOUT:     %impl.elem0: @ErrorIfNIsZero.%.loc12_3 (%.94a) = impl_witness_access constants.%Destroy.impl_witness.543, element0 [symbolic = %Int.as.Destroy.impl.Op (constants.%Int.as.Destroy.impl.Op.011)]
+// CHECK:STDOUT:     %bound_method.loc12_3.1: <bound method> = bound_method %v.var, %impl.elem0
+// CHECK:STDOUT:     %specific_fn: <specific function> = specific_function %impl.elem0, @Int.as.Destroy.impl.Op(constants.%N) [symbolic = %Int.as.Destroy.impl.Op.specific_fn (constants.%Int.as.Destroy.impl.Op.specific_fn.1f5)]
+// CHECK:STDOUT:     %bound_method.loc12_3.2: <bound method> = bound_method %v.var, %specific_fn
 // CHECK:STDOUT:     %addr: @ErrorIfNIsZero.%ptr (%ptr.784) = addr_of %v.var
-// CHECK:STDOUT:     %.loc12_3.1: init %empty_tuple.type = call %bound_method.loc12_3.2(%addr)
+// CHECK:STDOUT:     %Int.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method.loc12_3.2(%addr)
 // CHECK:STDOUT:     return
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
@@ -178,11 +177,12 @@ fn CallNegative() {
 // CHECK:STDOUT:   %Int.loc12_20.2 => constants.%i0
 // CHECK:STDOUT:   %require_complete.loc12_20 => constants.%complete_type.d94
 // CHECK:STDOUT:   %pattern_type => constants.%pattern_type.47b
-// CHECK:STDOUT:   %Destroy.lookup_impl_witness => constants.%Destroy.impl_witness.404
-// CHECK:STDOUT:   %Destroy.facet => constants.%Destroy.facet.973
-// CHECK:STDOUT:   %.loc12_3.2 => constants.%.9ab
-// CHECK:STDOUT:   %impl.elem0.loc12_3.2 => constants.%T.as.Destroy.impl.Op.912
-// CHECK:STDOUT:   %specific_impl_fn.loc12_3.2 => constants.%T.as.Destroy.impl.Op.specific_fn
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.951
+// CHECK:STDOUT:   %Destroy.facet => constants.%Destroy.facet.4e0
+// CHECK:STDOUT:   %.loc12_3 => constants.%.53d
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.type => constants.%Int.as.Destroy.impl.Op.type.be2
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op => constants.%Int.as.Destroy.impl.Op.a22
+// CHECK:STDOUT:   %Int.as.Destroy.impl.Op.specific_fn => constants.%Int.as.Destroy.impl.Op.specific_fn.f1a
 // CHECK:STDOUT:   %ptr => constants.%ptr.3f1
 // CHECK:STDOUT:   %require_complete.loc12_3 => constants.%complete_type.588
 // CHECK:STDOUT: }
@@ -36,6 +36,13 @@ fn G() {
 // CHECK:STDOUT:   %pattern_type.7dcd0a.1: type = pattern_type %T [symbolic]
 // CHECK:STDOUT:   %Wrap.Make.type.652: type = fn_type @Wrap.Make, @Wrap(%T) [symbolic]
 // CHECK:STDOUT:   %Wrap.Make.eb2: %Wrap.Make.type.652 = struct_value () [symbolic]
+// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
+// CHECK:STDOUT:   %pattern_type.f6d: type = pattern_type auto [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.c6a: <witness> = impl_witness @Wrap.%Destroy.impl_witness_table, @Wrap.as.Destroy.impl(%T) [symbolic]
+// CHECK:STDOUT:   %ptr.b45: type = ptr_type %Wrap.af6 [symbolic]
+// CHECK:STDOUT:   %pattern_type.3b2: type = pattern_type %ptr.b45 [symbolic]
+// CHECK:STDOUT:   %Wrap.as.Destroy.impl.Op.type: type = fn_type @Wrap.as.Destroy.impl.Op, @Wrap.as.Destroy.impl(%T) [symbolic]
+// CHECK:STDOUT:   %Wrap.as.Destroy.impl.Op: %Wrap.as.Destroy.impl.Op.type = struct_value () [symbolic]
 // CHECK:STDOUT:   %empty_struct_type: type = struct_type {} [concrete]
 // CHECK:STDOUT:   %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
 // CHECK:STDOUT:   %require_complete.4ae: <witness> = require_complete_type %T [symbolic]
@@ -50,6 +57,11 @@ fn G() {
 // CHECK:STDOUT:   %i32.builtin: type = int_type signed, %int_32 [concrete]
 // CHECK:STDOUT:   %complete_type.f8a: <witness> = complete_type_witness %i32.builtin [concrete]
 // CHECK:STDOUT:   %C.elem: type = unbound_element_type %C, %array_type [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness.edd: <witness> = impl_witness @C.%Destroy.impl_witness_table [concrete]
+// CHECK:STDOUT:   %ptr.019: type = ptr_type %C [concrete]
+// CHECK:STDOUT:   %pattern_type.44a: type = pattern_type %ptr.019 [concrete]
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.type: type = fn_type @C.as.Destroy.impl.Op [concrete]
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op: %C.as.Destroy.impl.Op.type = struct_value () [concrete]
 // CHECK:STDOUT:   %struct_type.arr.5f2: type = struct_type {.arr: %array_type} [concrete]
 // CHECK:STDOUT:   %complete_type.22a: <witness> = complete_type_witness %struct_type.arr.5f2 [concrete]
 // CHECK:STDOUT:   %G.type: type = fn_type @G [concrete]
@@ -69,11 +81,6 @@ fn G() {
 // CHECK:STDOUT:   %Wrap.Make.type.708: type = fn_type @Wrap.Make, @Wrap(%C) [concrete]
 // CHECK:STDOUT:   %Wrap.Make.e4b: %Wrap.Make.type.708 = struct_value () [concrete]
 // CHECK:STDOUT:   %Wrap.Make.specific_fn.834: <specific function> = specific_function %Wrap.Make.e4b, @Wrap.Make(%C) [concrete]
-// CHECK:STDOUT:   %Destroy.type: type = facet_type <@Destroy> [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.153: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%C) [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.5d7: %T.as.Destroy.impl.Op.type.153 = struct_value () [concrete]
-// CHECK:STDOUT:   %ptr.019: type = ptr_type %C [concrete]
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.6eb: <specific function> = specific_function %T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(%C) [concrete]
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.type.a63: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%empty_tuple.type) [concrete]
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.ea3: %T.as.Destroy.impl.Op.type.a63 = struct_value () [concrete]
 // CHECK:STDOUT:   %ptr.843: type = ptr_type %empty_tuple.type [concrete]
@@ -87,13 +94,13 @@ fn G() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
-// CHECK:STDOUT:     .Int = %Core.Int
 // CHECK:STDOUT:     .Destroy = %Core.Destroy
+// CHECK:STDOUT:     .Int = %Core.Int
 // CHECK:STDOUT:     import Core//prelude
 // CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
-// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
 // CHECK:STDOUT:   %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: file {
@@ -113,6 +120,50 @@ fn G() {
 // CHECK:STDOUT:   %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {} {}
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic impl @Wrap.as.Destroy.impl(@Wrap.%T.loc15_12.2: type) {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T)]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness @Wrap.%Destroy.impl_witness_table, @Wrap.as.Destroy.impl(%T) [symbolic = %Destroy.impl_witness (constants.%Destroy.impl_witness.c6a)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %Wrap.as.Destroy.impl.Op.type: type = fn_type @Wrap.as.Destroy.impl.Op, @Wrap.as.Destroy.impl(%T) [symbolic = %Wrap.as.Destroy.impl.Op.type (constants.%Wrap.as.Destroy.impl.Op.type)]
+// CHECK:STDOUT:   %Wrap.as.Destroy.impl.Op: @Wrap.as.Destroy.impl.%Wrap.as.Destroy.impl.Op.type (%Wrap.as.Destroy.impl.Op.type) = struct_value () [symbolic = %Wrap.as.Destroy.impl.Op (constants.%Wrap.as.Destroy.impl.Op)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   impl: constants.%Wrap.af6 as constants.%Destroy.type {
+// CHECK:STDOUT:     %Wrap.as.Destroy.impl.Op.decl: @Wrap.as.Destroy.impl.%Wrap.as.Destroy.impl.Op.type (%Wrap.as.Destroy.impl.Op.type) = fn_decl @Wrap.as.Destroy.impl.Op [symbolic = @Wrap.as.Destroy.impl.%Wrap.as.Destroy.impl.Op (constants.%Wrap.as.Destroy.impl.Op)] {
+// CHECK:STDOUT:       %self.patt: @Wrap.as.Destroy.impl.Op.%pattern_type (%pattern_type.3b2) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @Wrap.as.Destroy.impl.Op.%pattern_type (%pattern_type.3b2) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %.loc15_22.1: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %self.param: @Wrap.as.Destroy.impl.Op.%ptr (%ptr.b45) = value_param call_param0
+// CHECK:STDOUT:       %.loc15_22.2: type = splice_block %Self.ref [symbolic = %Wrap (constants.%Wrap.af6)] {
+// CHECK:STDOUT:         %.loc15_22.3: type = specific_constant constants.%Wrap.af6, @Wrap(constants.%T) [symbolic = %Wrap (constants.%Wrap.af6)]
+// CHECK:STDOUT:         %Self.ref: type = name_ref Self, %.loc15_22.3 [symbolic = %Wrap (constants.%Wrap.af6)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Wrap.as.Destroy.impl.Op.%ptr (%ptr.b45) = bind_name self, %self.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Op = %Wrap.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:     witness = @Wrap.%Destroy.impl_witness
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: impl @C.as.Destroy.impl: constants.%C as constants.%Destroy.type {
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.decl: %C.as.Destroy.impl.Op.type = fn_decl @C.as.Destroy.impl.Op [concrete = constants.%C.as.Destroy.impl.Op] {
+// CHECK:STDOUT:     %self.patt: %pattern_type.44a = binding_pattern self [concrete]
+// CHECK:STDOUT:     %self.param_patt: %pattern_type.44a = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:     %.loc19: %pattern_type.f6d = addr_pattern %self.param_patt [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %self.param: %ptr.019 = value_param call_param0
+// CHECK:STDOUT:     %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
+// CHECK:STDOUT:     %self: %ptr.019 = bind_name self, %self.param
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Op = %C.as.Destroy.impl.Op.decl
+// CHECK:STDOUT:   witness = @C.%Destroy.impl_witness
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: generic class @Wrap(%T.loc15_12.2: type) {
 // CHECK:STDOUT:   %T.loc15_12.1: type = bind_symbolic_name T, 0 [symbolic = %T.loc15_12.1 (constants.%T)]
 // CHECK:STDOUT:
@@ -129,6 +180,9 @@ fn G() {
 // CHECK:STDOUT:       %return.param: ref @Wrap.Make.%T (%T) = out_param call_param0
 // CHECK:STDOUT:       %return: ref @Wrap.Make.%T (%T) = return_slot %return.param
 // CHECK:STDOUT:     }
+// CHECK:STDOUT:     impl_decl @Wrap.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:     %Destroy.impl_witness_table = impl_witness_table (@Wrap.as.Destroy.impl.%Wrap.as.Destroy.impl.Op.decl), @Wrap.as.Destroy.impl [concrete]
+// CHECK:STDOUT:     %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table, @Wrap.as.Destroy.impl(constants.%T) [symbolic = @Wrap.as.Destroy.impl.%Destroy.impl_witness (constants.%Destroy.impl_witness.c6a)]
 // CHECK:STDOUT:     %empty_struct_type: type = struct_type {} [concrete = constants.%empty_struct_type]
 // CHECK:STDOUT:     %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete = constants.%complete_type.357]
 // CHECK:STDOUT:     complete_type_witness = %complete_type
@@ -146,6 +200,9 @@ fn G() {
 // CHECK:STDOUT:   %int_100: Core.IntLiteral = int_value 100 [concrete = constants.%int_100]
 // CHECK:STDOUT:   %array_type: type = array_type %int_100, %i32 [concrete = constants.%array_type]
 // CHECK:STDOUT:   %.loc19: %C.elem = field_decl arr, element0 [concrete]
+// CHECK:STDOUT:   impl_decl @C.as.Destroy.impl [concrete] {} {}
+// CHECK:STDOUT:   %Destroy.impl_witness_table = impl_witness_table (@C.as.Destroy.impl.%C.as.Destroy.impl.Op.decl), @C.as.Destroy.impl [concrete]
+// CHECK:STDOUT:   %Destroy.impl_witness: <witness> = impl_witness %Destroy.impl_witness_table [concrete = constants.%Destroy.impl_witness.edd]
 // CHECK:STDOUT:   %struct_type.arr: type = struct_type {.arr: %array_type} [concrete = constants.%struct_type.arr.5f2]
 // CHECK:STDOUT:   %complete_type: <witness> = complete_type_witness %struct_type.arr [concrete = constants.%complete_type.22a]
 // CHECK:STDOUT:   complete_type_witness = %complete_type
@@ -177,6 +234,19 @@ fn G() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Wrap.as.Destroy.impl.Op(@Wrap.%T.loc15_12.2: type) {
+// CHECK:STDOUT:   %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T)]
+// CHECK:STDOUT:   %Wrap: type = class_type @Wrap, @Wrap(%T) [symbolic = %Wrap (constants.%Wrap.af6)]
+// CHECK:STDOUT:   %ptr: type = ptr_type %Wrap [symbolic = %ptr (constants.%ptr.b45)]
+// CHECK:STDOUT:   %pattern_type: type = pattern_type %ptr [symbolic = %pattern_type (constants.%pattern_type.3b2)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @Wrap.as.Destroy.impl.Op.%ptr (%ptr.b45)) = "no_op";
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @C.as.Destroy.impl.Op(%self.param: %ptr.019) = "no_op";
+// CHECK:STDOUT:
 // CHECK:STDOUT: fn @G() {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   name_binding_decl {
@@ -233,24 +303,20 @@ fn G() {
 // CHECK:STDOUT:   assign %c.var, %Wrap.Make.call.loc24
 // CHECK:STDOUT:   %C.ref.loc24_10: type = name_ref C, file.%C.decl [concrete = constants.%C]
 // CHECK:STDOUT:   %c: ref %C = bind_name c, %c.var
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound.loc24_3.1: <bound method> = bound_method %.loc24_3, constants.%T.as.Destroy.impl.Op.5d7
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.1: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(constants.%C) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn.6eb]
-// CHECK:STDOUT:   %bound_method.loc24_3.1: <bound method> = bound_method %.loc24_3, %T.as.Destroy.impl.Op.specific_fn.1
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.bound.loc24_3.1: <bound method> = bound_method %.loc24_3, constants.%C.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr.loc24_3.1: %ptr.019 = addr_of %.loc24_3
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call.loc24_3.1: init %empty_tuple.type = call %bound_method.loc24_3.1(%addr.loc24_3.1)
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound.loc24_3.2: <bound method> = bound_method %c.var, constants.%T.as.Destroy.impl.Op.5d7
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.2: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.5d7, @T.as.Destroy.impl.Op(constants.%C) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn.6eb]
-// CHECK:STDOUT:   %bound_method.loc24_3.2: <bound method> = bound_method %c.var, %T.as.Destroy.impl.Op.specific_fn.2
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.call.loc24_3.1: init %empty_tuple.type = call %C.as.Destroy.impl.Op.bound.loc24_3.1(%addr.loc24_3.1)
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.bound.loc24_3.2: <bound method> = bound_method %c.var, constants.%C.as.Destroy.impl.Op
 // CHECK:STDOUT:   %addr.loc24_3.2: %ptr.019 = addr_of %c.var
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.call.loc24_3.2: init %empty_tuple.type = call %bound_method.loc24_3.2(%addr.loc24_3.2)
+// CHECK:STDOUT:   %C.as.Destroy.impl.Op.call.loc24_3.2: init %empty_tuple.type = call %C.as.Destroy.impl.Op.bound.loc24_3.2(%addr.loc24_3.2)
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound.loc23: <bound method> = bound_method %b.var, constants.%T.as.Destroy.impl.Op.ea3
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.3: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.ea3, @T.as.Destroy.impl.Op(constants.%empty_tuple.type) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn.393]
-// CHECK:STDOUT:   %bound_method.loc23: <bound method> = bound_method %b.var, %T.as.Destroy.impl.Op.specific_fn.3
+// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.1: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.ea3, @T.as.Destroy.impl.Op(constants.%empty_tuple.type) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn.393]
+// CHECK:STDOUT:   %bound_method.loc23: <bound method> = bound_method %b.var, %T.as.Destroy.impl.Op.specific_fn.1
 // CHECK:STDOUT:   %addr.loc23: %ptr.843 = addr_of %b.var
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.call.loc23: init %empty_tuple.type = call %bound_method.loc23(%addr.loc23)
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.bound.loc22: <bound method> = bound_method %a.var, constants.%T.as.Destroy.impl.Op.e6a
-// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.4: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.e6a, @T.as.Destroy.impl.Op(constants.%i32) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn.014]
-// CHECK:STDOUT:   %bound_method.loc22: <bound method> = bound_method %a.var, %T.as.Destroy.impl.Op.specific_fn.4
+// CHECK:STDOUT:   %T.as.Destroy.impl.Op.specific_fn.2: <specific function> = specific_function constants.%T.as.Destroy.impl.Op.e6a, @T.as.Destroy.impl.Op(constants.%i32) [concrete = constants.%T.as.Destroy.impl.Op.specific_fn.014]
+// CHECK:STDOUT:   %bound_method.loc22: <bound method> = bound_method %a.var, %T.as.Destroy.impl.Op.specific_fn.2
 // CHECK:STDOUT:   %addr.loc22: %ptr.235 = addr_of %a.var
 // CHECK:STDOUT:   %T.as.Destroy.impl.Op.call.loc22: init %empty_tuple.type = call %bound_method.loc22(%addr.loc22)
 // CHECK:STDOUT:   return
@@ -275,6 +341,18 @@ fn G() {
 // CHECK:STDOUT:   %Wrap.Make.specific_fn.loc16_27.2 => constants.%Wrap.Make.specific_fn.bf1
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: specific @Wrap.as.Destroy.impl(constants.%T) {
+// CHECK:STDOUT:   %T => constants.%T
+// CHECK:STDOUT:   %Destroy.impl_witness => constants.%Destroy.impl_witness.c6a
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Wrap.as.Destroy.impl.Op(constants.%T) {
+// CHECK:STDOUT:   %T => constants.%T
+// CHECK:STDOUT:   %Wrap => constants.%Wrap.af6
+// CHECK:STDOUT:   %ptr => constants.%ptr.b45
+// CHECK:STDOUT:   %pattern_type => constants.%pattern_type.3b2
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: specific @Wrap(constants.%i32) {
 // CHECK:STDOUT:   %T.loc15_12.1 => constants.%i32
 // CHECK:STDOUT: