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[Carbon/C++ interop] Add support for C++ overloaded functions (#5891)

Browse Source 
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
This commit is contained in:
Ivana Ivanovska
2025-09-15 12:29:49 +00:00
committed by GitHub
parent 20ac6b9270
commit 12ddfb9c7c
61 changed files with 4633 additions and 2252 deletions
Download Patch File Download Diff File Expand all files Collapse all files
toolchain/check/testdata/interop/cpp/function/pointer.carbon
Vendored
+50 -29
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@@ -178,10 +178,10 @@ fn F() {
var s: Cpp.S = {};
// CHECK:STDERR: fail_todo_import_nullable_pointer_param.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: S *` [SemanticsTodo]
// CHECK:STDERR: Cpp.foo(&s);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_todo_import_nullable_pointer_param.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR: fail_todo_import_nullable_pointer_param.carbon:[[@LINE+4]]:3: note: in call to Cpp function here [InCallToCppFunction]
// CHECK:STDERR: Cpp.foo(&s);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
Cpp.foo(&s);
//@dump-sem-ir-end
@@ -195,6 +195,8 @@ fn F() {
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %pattern_type.7da: type = pattern_type %S [concrete]
// CHECK:STDOUT: %S.val: %S = struct_value () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @foo [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %ptr.5c7: type = ptr_type %S [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
@@ -205,10 +207,11 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @foo [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
@@ -233,10 +236,10 @@ fn F() {
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %S = bind_name s, %s.var
// CHECK:STDOUT: %Cpp.ref.loc9: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %s.ref: ref %S = name_ref s, %s
// CHECK:STDOUT: %addr.loc9: %ptr.5c7 = addr_of %s.ref
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call %foo.ref(%addr.loc9)
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl(%addr.loc9)
// CHECK:STDOUT: %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %s.var, constants.%T.as.Destroy.impl.Op.777
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %s.var, %T.as.Destroy.impl.Op.specific_fn
@@ -266,6 +269,8 @@ fn F() {
// CHECK:STDOUT: %Copy.facet.334: %Copy.type = facet_value %ptr.5c7, (%Copy.impl_witness.dea) [concrete]
// CHECK:STDOUT: %.816: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.334 [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.0c6, @ptr.as.Copy.impl.Op(%S) [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @Copy.Op [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %ptr.dfe: type = ptr_type %ptr.5c7 [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
@@ -278,12 +283,13 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// 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: %.a21: %.c5d = cpp_overload_set_value @Copy.Op [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
@@ -327,10 +333,10 @@ fn F() {
// CHECK:STDOUT: }
// CHECK:STDOUT: %p: ref %ptr.5c7 = bind_name p, %p.var
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %p.ref: ref %ptr.5c7 = name_ref p, %p
// CHECK:STDOUT: %addr.loc10: %ptr.dfe = addr_of %p.ref
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call %foo.ref(%addr.loc10)
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl(%addr.loc10)
// CHECK:STDOUT: %T.as.Destroy.impl.Op.bound.loc9: <bound method> = bound_method %p.var, constants.%T.as.Destroy.impl.Op.014
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method.loc9_3: <bound method> = bound_method %p.var, %T.as.Destroy.impl.Op.specific_fn.1
@@ -353,6 +359,8 @@ fn F() {
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @F [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %ptr.ff5: type = ptr_type %const [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
@@ -363,10 +371,11 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @F [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
@@ -392,10 +401,10 @@ fn F() {
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %const = bind_name s, %s.var
// CHECK:STDOUT: %Cpp.ref.loc11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %s.ref: ref %const = name_ref s, %s
// CHECK:STDOUT: %addr.loc11: %ptr.ff5 = addr_of %s.ref
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call %foo.ref(%addr.loc11)
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl(%addr.loc11)
// CHECK:STDOUT: %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %s.var, constants.%T.as.Destroy.impl.Op.b63
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %s.var, %T.as.Destroy.impl.Op.specific_fn
@@ -412,6 +421,8 @@ fn F() {
// CHECK:STDOUT: %IngestDoublePointer.type: type = fn_type @IngestDoublePointer [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %IngestDoublePointer: %IngestDoublePointer.type = struct_value () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @F [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
@@ -419,10 +430,11 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @F [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
@@ -434,14 +446,14 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %IngestDoublePointer.ref: %IngestDoublePointer.type = name_ref IngestDoublePointer, file.%IngestDoublePointer.decl [concrete = constants.%IngestDoublePointer]
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref.loc10: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call.loc10: init %ptr = call %foo.ref.loc10()
// CHECK:STDOUT: %foo.ref.loc10: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call.loc10: init %ptr = call imports.%foo.decl()
// CHECK:STDOUT: %.loc10_31.1: %ptr = value_of_initializer %foo.call.loc10
// CHECK:STDOUT: %.loc10_31.2: %ptr = converted %foo.call.loc10, %.loc10_31.1
// CHECK:STDOUT: %IngestDoublePointer.call: init %empty_tuple.type = call %IngestDoublePointer.ref(%.loc10_31.2)
// CHECK:STDOUT: %Cpp.ref.loc11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref.loc11: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call.loc11: init %ptr = call %foo.ref.loc11()
// CHECK:STDOUT: %foo.ref.loc11: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call.loc11: init %ptr = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -454,6 +466,8 @@ fn F() {
// CHECK:STDOUT: %IngestDoublePointer.type: type = fn_type @IngestDoublePointer [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %IngestDoublePointer: %IngestDoublePointer.type = struct_value () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @F [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
@@ -461,10 +475,11 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @F [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
@@ -476,14 +491,14 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %IngestDoublePointer.ref: %IngestDoublePointer.type = name_ref IngestDoublePointer, file.%IngestDoublePointer.decl [concrete = constants.%IngestDoublePointer]
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref.loc10: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call.loc10: init %ptr.dfe = call %foo.ref.loc10()
// CHECK:STDOUT: %foo.ref.loc10: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call.loc10: init %ptr.dfe = call imports.%foo.decl()
// CHECK:STDOUT: %.loc10_31.1: %ptr.dfe = value_of_initializer %foo.call.loc10
// CHECK:STDOUT: %.loc10_31.2: %ptr.dfe = converted %foo.call.loc10, %.loc10_31.1
// CHECK:STDOUT: %IngestDoublePointer.call: init %empty_tuple.type = call %IngestDoublePointer.ref(%.loc10_31.2)
// CHECK:STDOUT: %Cpp.ref.loc11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref.loc11: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call.loc11: init %ptr.dfe = call %foo.ref.loc11()
// CHECK:STDOUT: %foo.ref.loc11: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call.loc11: init %ptr.dfe = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -496,6 +511,8 @@ fn F() {
// CHECK:STDOUT: %IngestConstPointer.type: type = fn_type @IngestConstPointer [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %IngestConstPointer: %IngestConstPointer.type = struct_value () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @F [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
@@ -503,10 +520,11 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = %foo.decl
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @F [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
@@ -518,14 +536,14 @@ fn F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %IngestConstPointer.ref: %IngestConstPointer.type = name_ref IngestConstPointer, file.%IngestConstPointer.decl [concrete = constants.%IngestConstPointer]
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref.loc10: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call.loc10: init %ptr = call %foo.ref.loc10()
// CHECK:STDOUT: %foo.ref.loc10: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call.loc10: init %ptr = call imports.%foo.decl()
// CHECK:STDOUT: %.loc10_30.1: %ptr = value_of_initializer %foo.call.loc10
// CHECK:STDOUT: %.loc10_30.2: %ptr = converted %foo.call.loc10, %.loc10_30.1
// CHECK:STDOUT: %IngestConstPointer.call: init %empty_tuple.type = call %IngestConstPointer.ref(%.loc10_30.2)
// CHECK:STDOUT: %Cpp.ref.loc11: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref.loc11: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
// CHECK:STDOUT: %foo.call.loc11: init %ptr = call %foo.ref.loc11()
// CHECK:STDOUT: %foo.ref.loc11: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %foo.call.loc11: init %ptr = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -537,6 +555,8 @@ fn F() {
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %pattern_type.7da: type = pattern_type %S [concrete]
// CHECK:STDOUT: %S.val: %S = struct_value () [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @Destroy.Op [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]
// CHECK:STDOUT: %ptr.5c7: type = ptr_type %S [concrete]
// CHECK:STDOUT: %T.as.Destroy.impl.Op.type.f1d: type = fn_type @T.as.Destroy.impl.Op, @T.as.Destroy.impl(%S) [concrete]
// CHECK:STDOUT: %T.as.Destroy.impl.Op.777: %T.as.Destroy.impl.Op.type.f1d = struct_value () [concrete]
@@ -545,10 +565,11 @@ fn F() {
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .S = %S.decl
// CHECK:STDOUT: .foo = <error>
// CHECK:STDOUT: .foo = %.a21
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
// CHECK:STDOUT: %.a21: %.c5d = cpp_overload_set_value @Destroy.Op [concrete = constants.%empty_struct]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
@@ -568,7 +589,7 @@ fn F() {
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: ref %S = bind_name s, %s.var
// CHECK:STDOUT: %Cpp.ref.loc16: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
// CHECK:STDOUT: %foo.ref: %.c5d = name_ref foo, imports.%.a21 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %s.ref: ref %S = name_ref s, %s
// CHECK:STDOUT: %addr.loc16: %ptr.5c7 = addr_of %s.ref
// CHECK:STDOUT: %T.as.Destroy.impl.Op.bound: <bound method> = bound_method %s.var, constants.%T.as.Destroy.impl.Op.777