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carbon-lang/toolchain/check/testdata/interop/cpp/impls/copy.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +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.d6a: type = const_type %Copyable [concrete]
// CHECK:STDOUT: %ptr.f70: type = ptr_type %const.d6a [concrete]
// CHECK:STDOUT: %ptr.6cb: 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.d0da43.1: <witness> = custom_witness (%Copyable.Op), @Copy [concrete]
// CHECK:STDOUT: %Copy.facet.07e: %Copy.type = facet_value %Copyable, (%custom_witness.d0da43.1) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.1d7: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.07e) [concrete]
// CHECK:STDOUT: %.e4c: type = fn_type_with_self_type %Copy.WithSelf.Op.type.1d7, %Copy.facet.07e [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.af8: type = const_type %ExplicitCopy [concrete]
// CHECK:STDOUT: %ptr.613: type = ptr_type %const.af8 [concrete]
// CHECK:STDOUT: %ptr.12a: 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.d0da43.2: <witness> = custom_witness (%ExplicitCopy.Op), @Copy [concrete]
// CHECK:STDOUT: %Copy.facet.932: %Copy.type = facet_value %ExplicitCopy, (%custom_witness.d0da43.2) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.c5b: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.932) [concrete]
// CHECK:STDOUT: %.682: type = fn_type_with_self_type %Copy.WithSelf.Op.type.c5b, %Copy.facet.932 [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: %.e4c = impl_witness_access constants.%custom_witness.d0da43.1, 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.6cb = addr_of %.loc8_10.2
// CHECK:STDOUT: %.loc8_10.3: %ptr.f70 = as_compatible %addr.loc8_10.1
// CHECK:STDOUT: %.loc8_10.4: %ptr.f70 = converted %addr.loc8_10.1, %.loc8_10.3
// CHECK:STDOUT: %addr.loc8_10.2: %ptr.6cb = 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: %.682 = impl_witness_access constants.%custom_witness.d0da43.2, 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.12a = addr_of %.loc14_10.2
// CHECK:STDOUT: %.loc14_10.3: %ptr.613 = as_compatible %addr.loc14_10.1
// CHECK:STDOUT: %.loc14_10.4: %ptr.613 = converted %addr.loc14_10.1, %.loc14_10.3
// CHECK:STDOUT: %addr.loc14_10.2: %ptr.12a = 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.bd0: type = facet_type <@Copy.1> [concrete]
// CHECK:STDOUT: %Copy.type.705: type = fn_type @Copy.loc6 [concrete]
// CHECK:STDOUT: %Copy: %Copy.type.705 = struct_value () [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.ff5: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.ce9: %ptr.as.Copy.impl.Op.type.ff5 = 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.d0d: <witness> = custom_witness (%Copyable.Op), @Copy.1 [concrete]
// CHECK:STDOUT: %Copy.facet.07e: %Copy.type.bd0 = facet_value %Copyable, (%custom_witness.d0d) [concrete]
// CHECK:STDOUT: %Copy.specific_fn: <specific function> = specific_function %Copy, @Copy.loc6(%Copy.facet.07e) [concrete]
// CHECK:STDOUT: %Wrap.993: type = class_type @Wrap, @Wrap(%Copy.facet.07e) [concrete]
// CHECK:STDOUT: %ptr.fa1: type = ptr_type %Wrap.993 [concrete]
// CHECK:STDOUT: %Copy.impl_witness.73a: <witness> = impl_witness imports.%Copy.impl_witness_table.4f1, @ptr.as.Copy.impl(%Wrap.993) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.085: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%Wrap.993) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.a0b: %ptr.as.Copy.impl.Op.type.085 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.ba8: %Copy.type.bd0 = facet_value %ptr.fa1, (%Copy.impl_witness.73a) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.b3b: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet.ba8) [concrete]
// CHECK:STDOUT: %.a0e: type = fn_type_with_self_type %Copy.WithSelf.Op.type.b3b, %Copy.facet.ba8 [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.a0b, @ptr.as.Copy.impl.Op(%Wrap.993) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.e5f: @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op.type (%ptr.as.Copy.impl.Op.type.ff5) = 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.ce9)]
// CHECK:STDOUT: %Copy.impl_witness_table.4f1 = impl_witness_table (%Core.import_ref.e5f), @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.705 = 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.loc12_16.1: %Copy.type.bd0 = facet_value constants.%Copyable, (constants.%custom_witness.d0d) [concrete = constants.%Copy.facet.07e]
// CHECK:STDOUT: %.loc12_16.1: %Copy.type.bd0 = converted constants.%Copyable, %Copy.facet.loc12_16.1 [concrete = constants.%Copy.facet.07e]
// CHECK:STDOUT: %Copy.facet.loc12_16.2: %Copy.type.bd0 = facet_value constants.%Copyable, (constants.%custom_witness.d0d) [concrete = constants.%Copy.facet.07e]
// CHECK:STDOUT: %.loc12_16.2: %Copy.type.bd0 = converted constants.%Copyable, %Copy.facet.loc12_16.2 [concrete = constants.%Copy.facet.07e]
// CHECK:STDOUT: %Copy.specific_fn: <specific function> = specific_function %Copy.ref, @Copy.loc6(constants.%Copy.facet.07e) [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.fa1) -> out %return.param: %ptr.fa1 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %p.ref: %ptr.fa1 = name_ref p, %p
// CHECK:STDOUT: %impl.elem0: %.a0e = impl_witness_access constants.%Copy.impl_witness.73a, element0 [concrete = constants.%ptr.as.Copy.impl.Op.a0b]
// 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.993) [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.fa1 = 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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