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carbon-lang/toolchain/check/testdata/interop/cpp/impls/copy.carbon
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Chandler CarruthandChristopher Di Bella 8a59f2a76b Fix mangling collision for C++ class template specializations (#7269) 
Carbon-side thunks (for example the `Copy`/`Destroy` witness thunks
generated for imported C++ types) are mangled by Carbon, and their names
incorporate a fingerprint of the involved types. The instruction
fingerprinter identifies a class only by its name and parent scope,
which is sufficient for Carbon classes but not for imported C++ classes:
different specializations of one class template (and other cases such as
types in anonymous namespaces) share a Carbon name and parent scope. As
a result, the thunks for two distinct specializations could mangle to
the same name, producing a single LLVM function with two definitions and
failing `verifyModule` during lowering.

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

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

Assisted-by: Claude Code

---------

Co-authored-by: Christopher Di Bella <cjdb.ns@gmail.com>
2026-05-30 08:13:00 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/impls/copy.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/impls/copy.carbon
// --- types.h
class Copyable {
public:
Copyable(const Copyable&);
};
class ExplicitCopy {
public:
explicit ExplicitCopy(const ExplicitCopy&);
};
class DeletedCopy {
public:
DeletedCopy(const DeletedCopy&) = delete;
};
class MoveOnly {
public:
MoveOnly(MoveOnly&&);
};
class DeletedMove {
public:
DeletedMove(DeletedMove&&) = delete;
};
class NonConstCopy {
public:
NonConstCopy(NonConstCopy&);
};
class AmbiguousCopy {
public:
AmbiguousCopy(const AmbiguousCopy&, int = 0);
AmbiguousCopy(const AmbiguousCopy&, char = 0);
};
class PrivateCopy {
private:
PrivateCopy(const PrivateCopy&);
};
class ProtectedCopy {
protected:
ProtectedCopy(const ProtectedCopy&);
};
// --- copy_copyable.carbon
library "[[@TEST_NAME]]";
import Cpp library "types.h";
fn CopyCopyable(c: Cpp.Copyable) -> Cpp.Copyable {
//@dump-sem-ir-begin
return c;
//@dump-sem-ir-end
}
fn CopyExplicitCopy(c: Cpp.ExplicitCopy) -> Cpp.ExplicitCopy {
//@dump-sem-ir-begin
return c;
//@dump-sem-ir-end
}
// --- fail_copy_noncopyable.carbon
library "[[@TEST_NAME]]";
import Cpp library "types.h";
fn CopyDeletedCopy(c: Cpp.DeletedCopy) -> Cpp.DeletedCopy {
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: attempt to use a deleted function [CppInteropParseError]
// CHECK:STDERR: 15 | return c;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:14:3: note: 'DeletedCopy' has been explicitly marked deleted here [CppInteropParseNote]
// CHECK:STDERR: 14 | DeletedCopy(const DeletedCopy&) = delete;
// CHECK:STDERR: | ^
// CHECK:STDERR:
return c;
}
fn CopyMoveOnly(c: Cpp.MoveOnly) -> Cpp.MoveOnly {
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: attempt to use a deleted function [CppInteropParseError]
// CHECK:STDERR: 27 | return c;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-18]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:19:3: note: copy constructor is implicitly deleted because 'MoveOnly' has a user-declared move constructor [CppInteropParseNote]
// CHECK:STDERR: 19 | MoveOnly(MoveOnly&&);
// CHECK:STDERR: | ^
// CHECK:STDERR:
return c;
}
fn CopyDeletedMove(c: Cpp.DeletedMove) -> Cpp.DeletedMove {
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: attempt to use a deleted function [CppInteropParseError]
// CHECK:STDERR: 39 | return c;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-30]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:24:3: note: copy constructor is implicitly deleted because 'DeletedMove' has a user-declared move constructor [CppInteropParseNote]
// CHECK:STDERR: 24 | DeletedMove(DeletedMove&&) = delete;
// CHECK:STDERR: | ^
// CHECK:STDERR:
return c;
}
fn CopyNonConstCopy(c: Cpp.NonConstCopy) -> Cpp.NonConstCopy {
// TODO: List candidates here.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+7]]:10: error: cannot copy value of type `Cpp.NonConstCopy` [CopyOfUncopyableType]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+4]]:10: note: type `Cpp.NonConstCopy` does not implement interface `Core.Copy` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR:
return c;
}
fn CopyAmbiguousCopy(c: Cpp.AmbiguousCopy) -> Cpp.AmbiguousCopy {
// TODO: List candidates here.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+7]]:10: error: cannot copy value of type `Cpp.AmbiguousCopy` [CopyOfUncopyableType]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+4]]:10: note: type `Cpp.AmbiguousCopy` does not implement interface `Core.Copy` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR:
return c;
}
fn CopyPrivateCopy(c: Cpp.PrivateCopy) -> Cpp.PrivateCopy {
// TODO: Note is missing location.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: cannot access private member `PrivateCopy` of type `Cpp.PrivateCopy` [ClassInvalidMemberAccess]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-67]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:40:3: note: declared here [ClassMemberDeclaration]
// CHECK:STDERR: PrivateCopy(const PrivateCopy&);
// CHECK:STDERR: ^
// CHECK:STDERR:
return c;
}
fn CopyProtectedCopy(c: Cpp.ProtectedCopy) -> Cpp.ProtectedCopy {
// TODO: Note is missing location.
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE+8]]:10: error: cannot access protected member `ProtectedCopy` of type `Cpp.ProtectedCopy` [ClassInvalidMemberAccess]
// CHECK:STDERR: return c;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_copy_noncopyable.carbon:[[@LINE-80]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./types.h:45:3: note: declared here [ClassMemberDeclaration]
// CHECK:STDERR: ProtectedCopy(const ProtectedCopy&);
// CHECK:STDERR: ^
// CHECK:STDERR:
return c;
}
// --- copy_generically.carbon
library "[[@TEST_NAME]]";
import Cpp library "types.h";
fn Copy[T:! Core.Copy](c: T) -> T {
return c;
}
fn DoCopy(c: Cpp.Copyable) -> Cpp.Copyable {
//@dump-sem-ir-begin
return Copy(c);
//@dump-sem-ir-end
}
class Wrap(T:! Core.Copy) {}
fn EqualWitnesses(p: Wrap(Cpp.Copyable)*) -> Wrap(Cpp.Copyable)* {
//@dump-sem-ir-begin
return p;
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- copy_copyable.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Copyable: type = class_type @Copyable [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Copyable.Copyable.type: type = fn_type @Copyable.Copyable [concrete]
// CHECK:STDOUT: %Copyable.Copyable: %Copyable.Copyable.type = struct_value () [concrete]
// CHECK:STDOUT: %const.151: type = const_type %Copyable [concrete]
// CHECK:STDOUT: %ptr.765: type = ptr_type %const.151 [concrete]
// CHECK:STDOUT: %ptr.fc9: type = ptr_type %Copyable [concrete]
// CHECK:STDOUT: %Copyable__carbon_thunk.type: type = fn_type @Copyable__carbon_thunk [concrete]
// CHECK:STDOUT: %Copyable__carbon_thunk: %Copyable__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %Copyable.Op.type: type = fn_type @Copyable.Op [concrete]
// CHECK:STDOUT: %Copyable.Op: %Copyable.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b8df63.1: <witness> = custom_witness (%Copyable.Op), @Copy [concrete]
// CHECK:STDOUT: %Copy.facet.0af: %Copy.type = facet_value %Copyable, (%custom_witness.b8df63.1) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.b36: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.0af) [concrete]
// CHECK:STDOUT: %.8c1: type = fn_type_with_self_type %Copy.WithSelf.Op.type.b36, %Copy.facet.0af [concrete]
// CHECK:STDOUT: %ExplicitCopy: type = class_type @ExplicitCopy [concrete]
// CHECK:STDOUT: %ExplicitCopy.ExplicitCopy.type: type = fn_type @ExplicitCopy.ExplicitCopy [concrete]
// CHECK:STDOUT: %ExplicitCopy.ExplicitCopy: %ExplicitCopy.ExplicitCopy.type = struct_value () [concrete]
// CHECK:STDOUT: %const.869: type = const_type %ExplicitCopy [concrete]
// CHECK:STDOUT: %ptr.39a: type = ptr_type %const.869 [concrete]
// CHECK:STDOUT: %ptr.82f: type = ptr_type %ExplicitCopy [concrete]
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk.type: type = fn_type @ExplicitCopy__carbon_thunk [concrete]
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk: %ExplicitCopy__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %ExplicitCopy.Op.type: type = fn_type @ExplicitCopy.Op [concrete]
// CHECK:STDOUT: %ExplicitCopy.Op: %ExplicitCopy.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b8df63.2: <witness> = custom_witness (%ExplicitCopy.Op), @Copy [concrete]
// CHECK:STDOUT: %Copy.facet.b31: %Copy.type = facet_value %ExplicitCopy, (%custom_witness.b8df63.2) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.baa: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.b31) [concrete]
// CHECK:STDOUT: %.fcd: type = fn_type_with_self_type %Copy.WithSelf.Op.type.baa, %Copy.facet.b31 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Copyable.Copyable.decl: %Copyable.Copyable.type = fn_decl @Copyable.Copyable [concrete = constants.%Copyable.Copyable] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %Copyable__carbon_thunk.decl: %Copyable__carbon_thunk.type = fn_decl @Copyable__carbon_thunk [concrete = constants.%Copyable__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %ExplicitCopy.ExplicitCopy.decl: %ExplicitCopy.ExplicitCopy.type = fn_decl @ExplicitCopy.ExplicitCopy [concrete = constants.%ExplicitCopy.ExplicitCopy] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk.decl: %ExplicitCopy__carbon_thunk.type = fn_decl @ExplicitCopy__carbon_thunk [concrete = constants.%ExplicitCopy__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CopyCopyable(%c.param: %Copyable) -> out %return.param: %Copyable {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %Copyable = name_ref c, %c
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %impl.elem0: %.8c1 = impl_witness_access constants.%custom_witness.b8df63.1, element0 [concrete = constants.%Copyable.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %.loc8_10.1: ref %Copyable = temporary_storage
// CHECK:STDOUT: %Op.ref: %Copyable.Copyable.type = name_ref Op, imports.%Copyable.Copyable.decl [concrete = constants.%Copyable.Copyable]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc8_10.2: ref %Copyable = value_as_ref %c.ref
// CHECK:STDOUT: %addr.loc8_10.1: %ptr.fc9 = addr_of %.loc8_10.2
// CHECK:STDOUT: %.loc8_10.3: %ptr.765 = as_compatible %addr.loc8_10.1
// CHECK:STDOUT: %.loc8_10.4: %ptr.765 = converted %addr.loc8_10.1, %.loc8_10.3
// CHECK:STDOUT: %addr.loc8_10.2: %ptr.fc9 = addr_of %.loc6_40.1
// CHECK:STDOUT: %Copyable__carbon_thunk.call: init %empty_tuple.type = call imports.%Copyable__carbon_thunk.decl(%.loc8_10.4, %addr.loc8_10.2)
// CHECK:STDOUT: %.loc8_10.5: init %Copyable to %.loc6_40.1 = mark_in_place_init %Copyable__carbon_thunk.call
// CHECK:STDOUT: return %.loc8_10.5 to %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CopyExplicitCopy(%c.param: %ExplicitCopy) -> out %return.param: %ExplicitCopy {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %ExplicitCopy = name_ref c, %c
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %impl.elem0: %.fcd = impl_witness_access constants.%custom_witness.b8df63.2, element0 [concrete = constants.%ExplicitCopy.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %.loc14_10.1: ref %ExplicitCopy = temporary_storage
// CHECK:STDOUT: %Op.ref: %ExplicitCopy.ExplicitCopy.type = name_ref Op, imports.%ExplicitCopy.ExplicitCopy.decl [concrete = constants.%ExplicitCopy.ExplicitCopy]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc14_10.2: ref %ExplicitCopy = value_as_ref %c.ref
// CHECK:STDOUT: %addr.loc14_10.1: %ptr.82f = addr_of %.loc14_10.2
// CHECK:STDOUT: %.loc14_10.3: %ptr.39a = as_compatible %addr.loc14_10.1
// CHECK:STDOUT: %.loc14_10.4: %ptr.39a = converted %addr.loc14_10.1, %.loc14_10.3
// CHECK:STDOUT: %addr.loc14_10.2: %ptr.82f = addr_of %.loc12_48.1
// CHECK:STDOUT: %ExplicitCopy__carbon_thunk.call: init %empty_tuple.type = call imports.%ExplicitCopy__carbon_thunk.decl(%.loc14_10.4, %addr.loc14_10.2)
// CHECK:STDOUT: %.loc14_10.5: init %ExplicitCopy to %.loc12_48.1 = mark_in_place_init %ExplicitCopy__carbon_thunk.call
// CHECK:STDOUT: return %.loc14_10.5 to %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- copy_generically.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Copy.type.62b: type = facet_type <@Copy.1> [concrete]
// CHECK:STDOUT: %Copy.type.543: type = fn_type @Copy.loc6 [concrete]
// CHECK:STDOUT: %Copy: %Copy.type.543 = struct_value () [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.b03: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.aed: %ptr.as.Copy.impl.Op.type.b03 = struct_value () [symbolic]
// CHECK:STDOUT: %Copyable: type = class_type @Copyable [concrete]
// CHECK:STDOUT: %Copyable.Op.type: type = fn_type @Copyable.Op [concrete]
// CHECK:STDOUT: %Copyable.Op: %Copyable.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b8d: <witness> = custom_witness (%Copyable.Op), @Copy.1 [concrete]
// CHECK:STDOUT: %Copy.facet.0af: %Copy.type.62b = facet_value %Copyable, (%custom_witness.b8d) [concrete]
// CHECK:STDOUT: %Copy.specific_fn: <specific function> = specific_function %Copy, @Copy.loc6(%Copy.facet.0af) [concrete]
// CHECK:STDOUT: %Wrap.cb4: type = class_type @Wrap, @Wrap(%Copy.facet.0af) [concrete]
// CHECK:STDOUT: %ptr.727: type = ptr_type %Wrap.cb4 [concrete]
// CHECK:STDOUT: %Copy.impl_witness.b80: <witness> = impl_witness imports.%Copy.impl_witness_table.760, @ptr.as.Copy.impl(%Wrap.cb4) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.b3b: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%Wrap.cb4) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.b43: %ptr.as.Copy.impl.Op.type.b3b = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.86d: %Copy.type.62b = facet_value %ptr.727, (%Copy.impl_witness.b80) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.111: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.86d) [concrete]
// CHECK:STDOUT: %.378: type = fn_type_with_self_type %Copy.WithSelf.Op.type.111, %Copy.facet.86d [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.b43, @ptr.as.Copy.impl.Op(%Wrap.cb4) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.13c: @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op.type (%ptr.as.Copy.impl.Op.type.b03) = import_ref Core//prelude/parts/copy, loc{{\d+_\d+}}, loaded [symbolic = @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op (constants.%ptr.as.Copy.impl.Op.aed)]
// CHECK:STDOUT: %Copy.impl_witness_table.760 = impl_witness_table (%Core.import_ref.13c), @ptr.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @DoCopy(%c.param: %Copyable) -> out %return.param: %Copyable {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Copy.ref: %Copy.type.543 = name_ref Copy, file.%Copy.decl [concrete = constants.%Copy]
// CHECK:STDOUT: %c.ref: %Copyable = name_ref c, %c
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %Copy.facet: %Copy.type.62b = facet_value constants.%Copyable, (constants.%custom_witness.b8d) [concrete = constants.%Copy.facet.0af]
// CHECK:STDOUT: %.loc12: %Copy.type.62b = converted constants.%Copyable, %Copy.facet [concrete = constants.%Copy.facet.0af]
// CHECK:STDOUT: %Copy.specific_fn: <specific function> = specific_function %Copy.ref, @Copy.loc6(constants.%Copy.facet.0af) [concrete = constants.%Copy.specific_fn]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %Copy.call: init %Copyable to %.loc10_34.1 = call %Copy.specific_fn(%c.ref)
// CHECK:STDOUT: return %Copy.call to %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @EqualWitnesses(%p.param: %ptr.727) -> out %return.param: %ptr.727 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %p.ref: %ptr.727 = name_ref p, %p
// CHECK:STDOUT: %impl.elem0: %.378 = impl_witness_access constants.%Copy.impl_witness.b80, element0 [concrete = constants.%ptr.as.Copy.impl.Op.b43]
// CHECK:STDOUT: %bound_method.loc20_10.1: <bound method> = bound_method %p.ref, %impl.elem0
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @ptr.as.Copy.impl.Op(constants.%Wrap.cb4) [concrete = constants.%ptr.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc20_10.2: <bound method> = bound_method %p.ref, %specific_fn
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.call: init %ptr.727 = call %bound_method.loc20_10.2(%p.ref)
// CHECK:STDOUT: return %ptr.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
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