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carbon-lang/toolchain/check/testdata/interop/cpp/class/import/union.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/class/import/union.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/class/import/union.carbon
// ============================================================================
// Declaration
// ============================================================================
// --- declaration.h
union Bar;
// --- import_declaration.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// --- fail_use_declaration_as_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
fn MyF() {
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+8]]:19: error: binding pattern has incomplete type `Bar` in name binding declaration [IncompleteTypeInBindingDecl]
// CHECK:STDERR: var unused bar: Cpp.Bar;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./declaration.h:2:7: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: union Bar;
// CHECK:STDERR: ^
// CHECK:STDERR:
var unused bar: Cpp.Bar;
}
// ============================================================================
// Definition
// ============================================================================
// --- definition.h
union Bar {};
// --- import_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "definition.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// Declaration and definition
// ============================================================================
// --- declaration_and_definition.h
union Bar;
union Bar {};
// --- import_declaration_and_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration_and_definition.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// Static member function
// ============================================================================
// --- static_member_function.h
union Bar {
public:
static auto foo() -> void;
};
// --- import_static_member_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "static_member_function.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.Bar.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Static data member
// ============================================================================
// --- static_data_member.h
union Bar {
public:
static Bar* _Nonnull foo;
};
// --- import_static_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "static_data_member.h";
fn MyF() {
//@dump-sem-ir-begin
let unused bar: Cpp.Bar* = Cpp.Bar.foo;
//@dump-sem-ir-end
}
// ============================================================================
// Data member
// ============================================================================
// --- data_member.h
union Bar {
public:
Bar* _Nonnull foo;
};
// --- import_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "data_member.h";
//@dump-sem-ir-begin
fn MyF(bar : Cpp.Bar*) {
let unused foo_bar: Cpp.Bar* = bar->foo;
}
//@dump-sem-ir-end
// ============================================================================
// Template
// ============================================================================
// --- template.h
struct X {};
template<typename T>
union Bar {};
// --- import_template.carbon
library "[[@TEST_NAME]]";
import Cpp library "template.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar(Cpp.X)*);
//@dump-sem-ir-end
// CHECK:STDOUT: --- import_declaration.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_declaration_and_definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_static_member_function.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.type: type = cpp_overload_set_type @Bar.foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.value: %Bar.foo.cpp_overload_set.type = cpp_overload_set_value @Bar.foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %Bar.foo.type: type = fn_type @Bar.foo [concrete]
// CHECK:STDOUT: %Bar.foo: %Bar.foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.value: %Bar.foo.cpp_overload_set.type = cpp_overload_set_value @Bar.foo.cpp_overload_set [concrete = constants.%Bar.foo.cpp_overload_set.value]
// CHECK:STDOUT: %Bar.foo.decl: %Bar.foo.type = fn_decl @Bar.foo [concrete = constants.%Bar.foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: %Bar.foo.cpp_overload_set.type = name_ref foo, imports.%Bar.foo.cpp_overload_set.value [concrete = constants.%Bar.foo.cpp_overload_set.value]
// CHECK:STDOUT: %Bar.foo.call: init %empty_tuple.type = call imports.%Bar.foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_static_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.4d6: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.4d6 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: %foo.patt: %pattern_type = ref_binding_pattern foo [concrete]
// CHECK:STDOUT: %foo.var_patt: %pattern_type = var_pattern %foo.patt [concrete]
// CHECK:STDOUT: %foo.var: ref %ptr.4d6 = var %foo.var_patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8_30: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8_33: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: ref %ptr.4d6 = name_ref foo, imports.%foo.var [concrete = imports.%foo.var]
// CHECK:STDOUT: %.loc8_26: type = splice_block %ptr [concrete = constants.%ptr.4d6] {
// CHECK:STDOUT: %Cpp.ref.loc8_19: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8_22: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref.loc8_22 [concrete = constants.%ptr.4d6]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc8_37: %ptr.4d6 = acquire_value %foo.ref
// CHECK:STDOUT: %bar: %ptr.4d6 = value_binding bar, %.loc8_37
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.4d6: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.4d6 [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: %Bar.elem: type = unbound_element_type %Bar, %ptr.4d6 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr.4d6 = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr.loc7 [concrete = constants.%ptr.4d6] {
// CHECK:STDOUT: %Cpp.ref.loc7: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc7: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc7: type = ptr_type %Bar.ref.loc7 [concrete = constants.%ptr.4d6]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr.4d6 = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr.4d6) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %foo_bar.patt: %pattern_type = value_binding_pattern foo_bar [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar.ref: %ptr.4d6 = name_ref bar, %bar
// CHECK:STDOUT: %.loc8_37.1: ref %Bar = deref %bar.ref
// CHECK:STDOUT: %foo.ref: %Bar.elem = name_ref foo, @Bar.%.1 [concrete = @Bar.%.1]
// CHECK:STDOUT: %.loc8_37.2: ref %ptr.4d6 = class_element_access %.loc8_37.1, element0
// CHECK:STDOUT: %.loc8_30: type = splice_block %ptr.loc8 [concrete = constants.%ptr.4d6] {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc8: type = ptr_type %Bar.ref.loc8 [concrete = constants.%ptr.4d6]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc8_37.3: %ptr.4d6 = acquire_value %.loc8_37.2
// CHECK:STDOUT: %foo_bar: %ptr.4d6 = value_binding foo_bar, %.loc8_37.3
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_template.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar.type: type = cpp_type_template_type Bar [concrete]
// CHECK:STDOUT: %Bar.template: %Bar.type = struct_value () [concrete]
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.template
// CHECK:STDOUT: .X = %X.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.template: %Bar.type = struct_value () [concrete = constants.%Bar.template]
// CHECK:STDOUT: %X.decl: type = class_decl @X [concrete = constants.%X] {} {}
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref.loc7_13: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: %Bar.type = name_ref Bar, imports.%Bar.template [concrete = constants.%Bar.template]
// CHECK:STDOUT: %Cpp.ref.loc7_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %X.ref: type = name_ref X, imports.%X.decl [concrete = constants.%X]
// CHECK:STDOUT: %ptr: type = ptr_type imports.%Bar.decl [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
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