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carbon-lang/toolchain/check/testdata/interop/cpp/class/template.carbon
T
Ivana Ivanovska 12ddfb9c7c [Carbon/C++ interop] Add support for C++ overloaded functions (#5891) 
As proposed in [Carbon: C++ interop for overloaded functions and
function
templates](https://docs.google.com/document/d/1KUxumZtNe3mY3TsjW2s_ZADOlAaFlrtsLKHVILtqIaM/edit?tab=t.0),
Clang is used to perform the overload resolution using C++ rules, when
an overloaded C++ set is called from Carbon. Once a function is
selected, it's converted into a Carbon function and called using the
Carbon rules including argument conversions.

A single non-templated function is treated the same way as an overload
set and the same rules apply for its call.
Template functions are not supported yet.

Demo:

a) Non-templated function calls:

```c++
// --- overloads.h

auto foo(int a, short b) -> void;
auto foo(double a) -> void;
auto foo(int a) -> void;
```

```c++
// overloads.cpp

#include "overloads.h"
#include <cstdio>

auto foo(int a, short b) -> void {
  printf("hello from foo_int_short(%d, %d) \n", a, b);
}
auto foo(double a) -> void { printf("hello from foo_double(%f) \n", a); }
auto foo(int a) -> void { printf("hello from foo_int(%d) \n", a); }
```
```c++
library "Main";

import Cpp library "overloads.h";

fn Run() -> i32 {
  Cpp.foo(1.1 as f64);
  return 0;
}
```
```
$ clang -c overloads.cpp 
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link overloads.o main.o --output=demo
$ ./demo
hello from foo_double(1.100000) 
```

b) Constructors:
```c++
// --- constructor_overloads.h
class C {
 public:
  C();
  C(int a, int b);
};
```

```c++
// constructor_overloads.cpp
#include "constructor_overloads.h"
#include <cstdio>

C::C() { printf("hello from C() \n"); }
C::C(int a, int b) { printf("hello from C(%d, %d) \n", a, b); }
```
```c++
library "Main";

import Cpp library "constructor_overloads.h";

fn Run() -> i32 {
  let c1: Cpp.C = Cpp.C.C();
  let c2: Cpp.C = Cpp.C.C(1, 2);
  return 0;
}
```

```
$ clang -c constructor_overloads.cpp 
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link constructor_overloads.o main.o \--output=demo
$ ./demo
hello from C() 
hello from C(1, 2) 
```


Follow-ups:

- `Cpp.foo({})` - proper handling of struct literals as call args.
- Fix access for overloaded sets.
- Fix tests:
- Method calls: `error: missing object argument in method call
[MissingObjectInMethodCall]` in tests.
    - Fix `toolchain/check/testdata/interop/cpp/import.carbon` test.
    - Fix `enums` support.
    - Fix `str` -> `std::string_view` mapping.


Part of #5915
2025-09-15 12:29:49 +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/int.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/class/template.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/class/template.carbon
// TODO: Tests marked as `fail_todo_5891_` to fixed as a follow-up of https://github.com/carbon-language/carbon-lang/pull/5891.
// --- class_template.h
struct Base {};
template<typename T> struct A : Base {
void f() const;
T n;
};
using Aint = A<int>;
using Along = A<long>;
// --- fail_todo_5891_use_class_template.carbon
library "[[@TEST_NAME]]";
import Cpp library "class_template.h";
fn F(x: Cpp.Aint) -> i32 {
// Trigger instantiation through name lookup.
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_5891_use_class_template.carbon:[[@LINE+5]]:3: error: missing object argument in method call [MissingObjectInMethodCall]
// CHECK:STDERR: x.f();
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_todo_5891_use_class_template.carbon: note: calling function declared here [InCallToFunction]
// CHECK:STDERR:
x.f();
return x.n;
//@dump-sem-ir-end
}
fn G(p: Cpp.Along*) -> Cpp.Base* {
// Trigger instantiation through type completion.
//@dump-sem-ir-begin
return p;
//@dump-sem-ir-end
}
// --- instantiation_error.h
template<typename T> struct X {
using type = typename T::member;
};
struct Y {
using member = int;
};
using XY = X<Y>;
using Xint = X<int>;
// --- fail_use_instantiation_error.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_use_instantiation_error.carbon:[[@LINE+8]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./instantiation_error.h:3:25: error: type 'int' cannot be used prior to '::' because it has no members [CppInteropParseError]
// CHECK:STDERR: 3 | using type = typename T::member;
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_use_instantiation_error.carbon:[[@LINE+4]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./instantiation_error.h:2:29: note: in instantiation of template class 'X<int>' requested here [CppInteropParseNote]
// CHECK:STDERR: 2 | template<typename T> struct X {
// CHECK:STDERR: | ^
import Cpp library "instantiation_error.h";
//@dump-sem-ir-begin
var x: Cpp.XY.r#type = 0;
// CHECK:STDERR: fail_use_instantiation_error.carbon:[[@LINE+4]]:8: note: while completing C++ type `Cpp.X` [InCppTypeCompletion]
// CHECK:STDERR: var y: Cpp.Xint.r#type = 0;
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
var y: Cpp.Xint.r#type = 0;
//@dump-sem-ir-end
// CHECK:STDOUT: --- fail_todo_5891_use_class_template.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A.0bedf0.1: type = class_type @A.1 [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = bind_symbolic_name N, 0 [symbolic]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %Base: type = class_type @Base [concrete]
// CHECK:STDOUT: %A.elem.c3f: type = unbound_element_type %A.0bedf0.1, %i32 [concrete]
// CHECK:STDOUT: %.658: type = cpp_overload_set_type @A.f [concrete]
// CHECK:STDOUT: %empty_struct: %.658 = struct_value () [concrete]
// CHECK:STDOUT: %const.16f: type = const_type %A.0bedf0.1 [concrete]
// CHECK:STDOUT: %ptr.703: type = ptr_type %const.16f [concrete]
// CHECK:STDOUT: %f__carbon_thunk.type: type = fn_type @f__carbon_thunk [concrete]
// CHECK:STDOUT: %f__carbon_thunk: %f__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %ptr.270828.1: type = ptr_type %A.0bedf0.1 [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Copy.Op.type: type = fn_type @Copy.Op [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.857: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.6aa: %Int.as.Copy.impl.Op.type.857 = struct_value () [symbolic]
// CHECK:STDOUT: %T.8b3: type = bind_symbolic_name T, 0 [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.f23: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%T.8b3) [symbolic]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.abf: %ptr.as.Copy.impl.Op.type.f23 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.f0b: <witness> = impl_witness imports.%Copy.impl_witness_table.f59, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.af5: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.87e: %Int.as.Copy.impl.Op.type.af5 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.26d: %Copy.type = facet_value %i32, (%Copy.impl_witness.f0b) [concrete]
// CHECK:STDOUT: %.3c4: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.26d [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.87e, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: %A.0bedf0.2: type = class_type @A.2 [concrete]
// CHECK:STDOUT: %ptr.270828.2: type = ptr_type %A.0bedf0.2 [concrete]
// CHECK:STDOUT: %ptr.fb2: type = ptr_type %Base [concrete]
// CHECK:STDOUT: %Copy.impl_witness.add: <witness> = impl_witness imports.%Copy.impl_witness_table.a71, @ptr.as.Copy.impl(%Base) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.212: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%Base) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.eb2: %ptr.as.Copy.impl.Op.type.212 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.869: %Copy.type = facet_value %ptr.fb2, (%Copy.impl_witness.add) [concrete]
// CHECK:STDOUT: %.e4a: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.869 [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.eb2, @ptr.as.Copy.impl.Op(%Base) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %.d46: %.658 = cpp_overload_set_value @A.f [concrete = constants.%empty_struct]
// CHECK:STDOUT: %f__carbon_thunk.decl: %f__carbon_thunk.type = fn_decl @f__carbon_thunk [concrete = constants.%f__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import_ref.b3c: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.857) = import_ref Core//prelude/parts/int, loc17_31, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.6aa)]
// CHECK:STDOUT: %Copy.impl_witness_table.f59 = impl_witness_table (%Core.import_ref.b3c), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: %Core.import_ref.de9: @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op.type (%ptr.as.Copy.impl.Op.type.f23) = import_ref Core//prelude/parts/copy, loc36_31, loaded [symbolic = @ptr.as.Copy.impl.%ptr.as.Copy.impl.Op (constants.%ptr.as.Copy.impl.Op.abf)]
// CHECK:STDOUT: %Copy.impl_witness_table.a71 = impl_witness_table (%Core.import_ref.de9), @ptr.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%x.param: %A.0bedf0.1) -> %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.ref.loc14: %A.0bedf0.1 = name_ref x, %x
// CHECK:STDOUT: %f.ref: %.658 = name_ref f, imports.%.d46 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %addr: %ptr.270828.1 = addr_of <error> [concrete = <error>]
// CHECK:STDOUT: %.loc14_7.1: %ptr.703 = as_compatible %addr [concrete = <error>]
// CHECK:STDOUT: %.loc14_7.2: %ptr.703 = converted %addr, %.loc14_7.1 [concrete = <error>]
// CHECK:STDOUT: %f__carbon_thunk.call: init %empty_tuple.type = call imports.%f__carbon_thunk.decl(%.loc14_7.2)
// CHECK:STDOUT: %x.ref.loc15: %A.0bedf0.1 = name_ref x, %x
// CHECK:STDOUT: %n.ref: %A.elem.c3f = name_ref n, @A.1.%.2 [concrete = @A.1.%.2]
// CHECK:STDOUT: %.loc15_11.1: ref %i32 = class_element_access %x.ref.loc15, element1
// CHECK:STDOUT: %.loc15_11.2: %i32 = bind_value %.loc15_11.1
// CHECK:STDOUT: %impl.elem0: %.3c4 = impl_witness_access constants.%Copy.impl_witness.f0b, element0 [concrete = constants.%Int.as.Copy.impl.Op.87e]
// CHECK:STDOUT: %bound_method.loc15_11.1: <bound method> = bound_method %.loc15_11.2, %impl.elem0
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc15_11.2: <bound method> = bound_method %.loc15_11.2, %specific_fn
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc15_11.2(%.loc15_11.2)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%p.param: %ptr.270828.2) -> %ptr.fb2 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %p.ref: %ptr.270828.2 = name_ref p, %p
// CHECK:STDOUT: %.loc22_11.1: ref %A.0bedf0.2 = deref %p.ref
// CHECK:STDOUT: %.loc22_11.2: ref %Base = class_element_access %.loc22_11.1, element0
// CHECK:STDOUT: %addr: %ptr.fb2 = addr_of %.loc22_11.2
// CHECK:STDOUT: %.loc22_11.3: %ptr.fb2 = converted %p.ref, %addr
// CHECK:STDOUT: %impl.elem0: %.e4a = impl_witness_access constants.%Copy.impl_witness.add, element0 [concrete = constants.%ptr.as.Copy.impl.Op.eb2]
// CHECK:STDOUT: %bound_method.loc22_11.1: <bound method> = bound_method %.loc22_11.3, %impl.elem0
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @ptr.as.Copy.impl.Op(constants.%Base) [concrete = constants.%ptr.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc22_11.2: <bound method> = bound_method %.loc22_11.3, %specific_fn
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.call: init %ptr.fb2 = call %bound_method.loc22_11.2(%.loc22_11.3)
// CHECK:STDOUT: return %ptr.as.Copy.impl.Op.call to %return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_use_instantiation_error.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %X.32d59e.1: type = class_type @X.1 [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.7ce: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %ImplicitAs.type.e8c: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %ImplicitAs.Convert.type.1b6: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%i32) [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.49e: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.f01: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.49e = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.acc: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.b6b, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.9ec: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.592: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.9ec = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.e8c = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.acc) [concrete]
// CHECK:STDOUT: %.7ea: type = fn_type_with_self_type %ImplicitAs.Convert.type.1b6, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.592 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.592, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_0.6a9: %i32 = int_value 0 [concrete]
// CHECK:STDOUT: %X.32d59e.2: type = class_type @X.2 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .XY = %X.decl.dec4cb.1
// CHECK:STDOUT: .Xint = %X.decl.dec4cb.2
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %X.decl.dec4cb.1: type = class_decl @X.1 [concrete = constants.%X.32d59e.1] {} {}
// CHECK:STDOUT: %Core.import_ref.428: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.49e) = import_ref Core//prelude/parts/int, loc23_39, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.f01)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.b6b = impl_witness_table (%Core.import_ref.428), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: %X.decl.dec4cb.2: type = class_decl @X.2 [concrete = constants.%X.32d59e.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.7ce = binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.7ce = var_pattern %x.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var: ref %i32 = var %x.var_patt [concrete]
// CHECK:STDOUT: %.loc15: type = splice_block %type.ref.loc15 [concrete = constants.%i32] {
// CHECK:STDOUT: %Cpp.ref.loc15: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %XY.ref: type = name_ref XY, imports.%X.decl.dec4cb.1 [concrete = constants.%X.32d59e.1]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %type.ref.loc15: type = name_ref r#type, %i32.2 [concrete = constants.%i32]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x: ref %i32 = bind_name x, %x.var [concrete = %x.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %y.patt: %pattern_type.7ce = binding_pattern y [concrete]
// CHECK:STDOUT: %y.var_patt: %pattern_type.7ce = var_pattern %y.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %y.var: ref %i32 = var %y.var_patt [concrete]
// CHECK:STDOUT: %.loc21: type = splice_block %type.ref.loc21 [concrete = constants.%i32] {
// CHECK:STDOUT: %Cpp.ref.loc21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Xint.ref: type = name_ref Xint, imports.%X.decl.dec4cb.2 [concrete = constants.%X.32d59e.2]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %type.ref.loc21: type = name_ref r#type, %i32.1 [concrete = constants.%i32]
// CHECK:STDOUT: }
// CHECK:STDOUT: %y: ref %i32 = bind_name y, %y.var [concrete = %y.var]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %int_0.loc15: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %impl.elem0.loc15: %.7ea = impl_witness_access constants.%ImplicitAs.impl_witness.acc, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.592]
// CHECK:STDOUT: %bound_method.loc15_1.1: <bound method> = bound_method %int_0.loc15, %impl.elem0.loc15 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn.loc15: <specific function> = specific_function %impl.elem0.loc15, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc15_1.2: <bound method> = bound_method %int_0.loc15, %specific_fn.loc15 [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc15: init %i32 = call %bound_method.loc15_1.2(%int_0.loc15) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15: init %i32 = converted %int_0.loc15, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc15 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: assign file.%x.var, %.loc15
// CHECK:STDOUT: %int_0.loc21: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %impl.elem0.loc21: %.7ea = impl_witness_access constants.%ImplicitAs.impl_witness.acc, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.592]
// CHECK:STDOUT: %bound_method.loc21_1.1: <bound method> = bound_method %int_0.loc21, %impl.elem0.loc21 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn.loc21: <specific function> = specific_function %impl.elem0.loc21, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc21_1.2: <bound method> = bound_method %int_0.loc21, %specific_fn.loc21 [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc21: init %i32 = call %bound_method.loc21_1.2(%int_0.loc21) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc21: init %i32 = converted %int_0.loc21, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc21 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: assign file.%y.var, %.loc21
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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