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fe020ee08bae71ca593ed964bbf787e651fc5d4d
carbon-lang/toolchain/check/testdata/interop/cpp/namespace.carbon
T
Dana Jansens fe020ee08b Make FacetAccessType evaluate to SymbolicBindingType for type-of a BindSymbolicName (#6115) 
The SymbolicBindingType refers to the type value that will be
substituted in for the BindSymbolicName, but holds onto the EntityNameId
from the BindSymbolicName instead of (or in addition to, for now) the
instruction.

The EntityNameId will be used to look in the ScopeStack to find the
witnesses either from the BindSymbolicName instruction, or other
instructions that specify `impls` constraints against the EntityName.

This will allow us to have the `T` in `I(T)` resolve to a `.Self`
reference in the type so that we get type equality with the binding's
type: `T:! I(.Self)`.
2025-10-06 18:56:43 +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/primitives.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/namespace.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/namespace.carbon
// ============================================================================
// Single
// ============================================================================
// --- single.h
namespace my_namespace { void foo(); }
// --- import_single.carbon
library "[[@TEST_NAME]]";
import Cpp library "single.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.my_namespace.foo();
//@dump-sem-ir-end
}
// --- fail_import_namespace_wrong_member_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "single.h";
fn MyF() {
// CHECK:STDERR: fail_import_namespace_wrong_member_name.carbon:[[@LINE+4]]:3: error: member name `not_foo` not found in `Cpp.my_namespace` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.my_namespace.not_foo();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.my_namespace.not_foo();
}
// --- fail_import_namespace_wrong_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "single.h";
fn MyF() {
// CHECK:STDERR: fail_import_namespace_wrong_name.carbon:[[@LINE+4]]:3: error: member name `not_my_namespace` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.not_my_namespace.foo();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.not_my_namespace.foo();
}
// ============================================================================
// Multiple
// ============================================================================
// --- multiple.h
namespace my_namespace1 {
void foo1();
namespace my_namespace2 {
void foo2();
namespace my_namespace3 {
void foo3();
}
}
}
// --- import_multiple.carbon
library "[[@TEST_NAME]]";
import Cpp library "multiple.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.my_namespace1.foo1();
Cpp.my_namespace1.my_namespace2.foo2();
Cpp.my_namespace1.my_namespace2.my_namespace3.foo3();
//@dump-sem-ir-end
}
// ============================================================================
// Inline namespace
// ============================================================================
// --- inline.h
inline namespace { namespace N { inline namespace { void foo() {} } } }
// --- import_inline.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.N.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Inline namespace triggers ambiguity
// ============================================================================
// --- inline_ambiguity.h
namespace N { void foo(); }
inline namespace { namespace N {} }
// --- fail_import_inline_ambiguity.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_ambiguity.h";
fn MyF() {
// Artificially create an error message here so that the first error line for
// this file (which otherwise has no source location) is associated with this
// file split.
// TODO: Pass a location into Clang when performing C++ name lookup so that
// its error has a location attached.
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+13]]:3: error: name `error` not found [NameNotFound]
// CHECK:STDERR: error;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
// CHECK:STDERR: error: reference to 'N' is ambiguous [CppInteropParseError]
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE-13]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./inline_ambiguity.h:2:11: note: candidate found by name lookup is 'N' [CppInteropParseNote]
// CHECK:STDERR: 2 | namespace N { void foo(); }
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE-17]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./inline_ambiguity.h:3:30: note: candidate found by name lookup is '(anonymous namespace)::N' [CppInteropParseNote]
// CHECK:STDERR: 3 | inline namespace { namespace N {} }
// CHECK:STDERR: | ^
error;
// CHECK:STDERR: fail_import_inline_ambiguity.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `N` [InCppNameLookup]
// CHECK:STDERR: Cpp.N.foo();
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
Cpp.N.foo();
}
// ============================================================================
// Inline namespace ambiguity not triggered
// ============================================================================
// --- inline_ambiguity_not_triggered.h
namespace N { struct X {}; }
auto foo() -> N::X;
inline namespace { namespace N {} }
// --- import_inline_ambiguity_not_triggered.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_ambiguity_not_triggered.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Carbon keyword name
// ============================================================================
// --- special_name.h
namespace base { void foo(); }
// --- fail_import_special_name_call_unescpaed.carbon
library "[[@TEST_NAME]]";
import Cpp library "special_name.h";
fn MyF() {
// CHECK:STDERR: fail_import_special_name_call_unescpaed.carbon:[[@LINE+4]]:3: error: member name `base` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.base.foo();
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
Cpp.base.foo();
}
// --- import_special_name_call_escpaed.carbon
library "[[@TEST_NAME]]";
import Cpp library "special_name.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.r#base.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Nested namespaces.
// ============================================================================
// --- nested.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
namespace A {
namespace B {
namespace C {
struct X { int n; };
}
}
}
struct Y {
A::B::C::X x;
};
''';
fn Use(y: Cpp.Y) -> i32 {
return y.x.n;
}
// CHECK:STDOUT: --- import_single.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .my_namespace = %my_namespace
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %my_namespace: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo = %foo.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%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: %my_namespace.ref: <namespace> = name_ref my_namespace, imports.%my_namespace [concrete = imports.%my_namespace]
// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_multiple.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo1.cpp_overload_set.type: type = cpp_overload_set_type @foo1.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo1.cpp_overload_set.value: %foo1.cpp_overload_set.type = cpp_overload_set_value @foo1.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo1.type: type = fn_type @foo1 [concrete]
// CHECK:STDOUT: %foo1: %foo1.type = struct_value () [concrete]
// CHECK:STDOUT: %foo2.cpp_overload_set.type: type = cpp_overload_set_type @foo2.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo2.cpp_overload_set.value: %foo2.cpp_overload_set.type = cpp_overload_set_value @foo2.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo2.type: type = fn_type @foo2 [concrete]
// CHECK:STDOUT: %foo2: %foo2.type = struct_value () [concrete]
// CHECK:STDOUT: %foo3.cpp_overload_set.type: type = cpp_overload_set_type @foo3.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo3.cpp_overload_set.value: %foo3.cpp_overload_set.type = cpp_overload_set_value @foo3.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo3.type: type = fn_type @foo3 [concrete]
// CHECK:STDOUT: %foo3: %foo3.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .my_namespace1 = %my_namespace1
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %my_namespace1: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo1 = %foo1.cpp_overload_set.value
// CHECK:STDOUT: .my_namespace2 = %my_namespace2
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo1.cpp_overload_set.value: %foo1.cpp_overload_set.type = cpp_overload_set_value @foo1.cpp_overload_set [concrete = constants.%foo1.cpp_overload_set.value]
// CHECK:STDOUT: %foo1.decl: %foo1.type = fn_decl @foo1 [concrete = constants.%foo1] {} {}
// CHECK:STDOUT: %my_namespace2: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo2 = %foo2.cpp_overload_set.value
// CHECK:STDOUT: .my_namespace3 = %my_namespace3
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo2.cpp_overload_set.value: %foo2.cpp_overload_set.type = cpp_overload_set_value @foo2.cpp_overload_set [concrete = constants.%foo2.cpp_overload_set.value]
// CHECK:STDOUT: %foo2.decl: %foo2.type = fn_decl @foo2 [concrete = constants.%foo2] {} {}
// CHECK:STDOUT: %my_namespace3: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo3 = %foo3.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo3.cpp_overload_set.value: %foo3.cpp_overload_set.type = cpp_overload_set_value @foo3.cpp_overload_set [concrete = constants.%foo3.cpp_overload_set.value]
// CHECK:STDOUT: %foo3.decl: %foo3.type = fn_decl @foo3 [concrete = constants.%foo3] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace1.ref.loc8: <namespace> = name_ref my_namespace1, imports.%my_namespace1 [concrete = imports.%my_namespace1]
// CHECK:STDOUT: %foo1.ref: %foo1.cpp_overload_set.type = name_ref foo1, imports.%foo1.cpp_overload_set.value [concrete = constants.%foo1.cpp_overload_set.value]
// CHECK:STDOUT: %foo1.call: init %empty_tuple.type = call imports.%foo1.decl()
// CHECK:STDOUT: %Cpp.ref.loc9: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace1.ref.loc9: <namespace> = name_ref my_namespace1, imports.%my_namespace1 [concrete = imports.%my_namespace1]
// CHECK:STDOUT: %my_namespace2.ref.loc9: <namespace> = name_ref my_namespace2, imports.%my_namespace2 [concrete = imports.%my_namespace2]
// CHECK:STDOUT: %foo2.ref: %foo2.cpp_overload_set.type = name_ref foo2, imports.%foo2.cpp_overload_set.value [concrete = constants.%foo2.cpp_overload_set.value]
// CHECK:STDOUT: %foo2.call: init %empty_tuple.type = call imports.%foo2.decl()
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %my_namespace1.ref.loc10: <namespace> = name_ref my_namespace1, imports.%my_namespace1 [concrete = imports.%my_namespace1]
// CHECK:STDOUT: %my_namespace2.ref.loc10: <namespace> = name_ref my_namespace2, imports.%my_namespace2 [concrete = imports.%my_namespace2]
// CHECK:STDOUT: %my_namespace3.ref: <namespace> = name_ref my_namespace3, imports.%my_namespace3 [concrete = imports.%my_namespace3]
// CHECK:STDOUT: %foo3.ref: %foo3.cpp_overload_set.type = name_ref foo3, imports.%foo3.cpp_overload_set.value [concrete = constants.%foo3.cpp_overload_set.value]
// CHECK:STDOUT: %foo3.call: init %empty_tuple.type = call imports.%foo3.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_inline.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .N = %N
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %N: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo = %foo.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%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: %N.ref: <namespace> = name_ref N, imports.%N [concrete = imports.%N]
// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_inline_ambiguity_not_triggered.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %ptr.13d: type = ptr_type %X [concrete]
// CHECK:STDOUT: %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
// CHECK:STDOUT: %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls <CanDestroy>> [concrete]
// CHECK:STDOUT: %facet_value: %type_where = facet_value %X, () [concrete]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.type.8b9: type = fn_type @DestroyT.binding.as_type.as.Destroy.impl.Op, @DestroyT.binding.as_type.as.Destroy.impl(%facet_value) [concrete]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.e4b: %DestroyT.binding.as_type.as.Destroy.impl.Op.type.8b9 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .foo = %foo.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo__carbon_thunk.decl: %foo__carbon_thunk.type = fn_decl @foo__carbon_thunk [concrete = constants.%foo__carbon_thunk] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: } {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// 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: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %.loc8_11.1: ref %X = temporary_storage
// CHECK:STDOUT: %addr.loc8_11.1: %ptr.13d = addr_of %.loc8_11.1
// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr.loc8_11.1)
// CHECK:STDOUT: %.loc8_11.2: init %X = in_place_init %foo__carbon_thunk.call, %.loc8_11.1
// CHECK:STDOUT: %.loc8_11.3: ref %X = temporary %.loc8_11.1, %.loc8_11.2
// CHECK:STDOUT: %facet_value: %type_where = facet_value constants.%X, () [concrete = constants.%facet_value]
// CHECK:STDOUT: %.loc8_11.4: %type_where = converted constants.%X, %facet_value [concrete = constants.%facet_value]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc8_11.3, constants.%DestroyT.binding.as_type.as.Destroy.impl.Op.e4b
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %.loc8_11.3, %DestroyT.binding.as_type.as.Destroy.impl.Op.specific_fn
// CHECK:STDOUT: %addr.loc8_11.2: %ptr.13d = addr_of %.loc8_11.3
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method(%addr.loc8_11.2)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_special_name_call_escpaed.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.type: type = cpp_overload_set_type @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %foo.type: type = fn_type @foo [concrete]
// CHECK:STDOUT: %foo: %foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .r#base = %base
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %base: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .foo = %foo.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo.cpp_overload_set.value: %foo.cpp_overload_set.type = cpp_overload_set_value @foo.cpp_overload_set [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%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: %base.ref: <namespace> = name_ref r#base, imports.%base [concrete = imports.%base]
// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.call: init %empty_tuple.type = call imports.%foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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