Files
carbon-lang/toolchain/check/testdata/interop/cpp/namespace/roundtrip.carbon
T
Richard SmithandChandler Carruth c588eadb57 Rename and rearrange entities in tests to avoid name reuse (#7656)
Fix a bunch of cases where we use the same external name to mean
multiple different things in the same test. We've historically gotten
away with this, but under `--share-cpp-ast`, it becomes an error, at
least if the entity is either defined in, or used from, C++ code.

Assisted-by: Gemini via Antigravity (original change) and Claude Code
(suggested edits in review)

---------

Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
2026-08-21 01:36:40 +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/none.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/roundtrip.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/namespace/roundtrip.carbon
// --- carbon_to_cpp_to_carbon.carbon
library "[[@TEST_NAME]]";
import Cpp;
namespace N;
inline Cpp '''
namespace M = Carbon::N;
''';
class C {}
fn N.F(c: C);
fn G(c: C) {
Cpp.M.F(c);
}
// --- cpp_to_carbon_to_cpp.carbon
library "[[@TEST_NAME]]";
import Cpp;
inline Cpp '''
namespace N {}
''';
alias M = Cpp.N;
inline Cpp '''
namespace N { void F(); }
static_assert(&N::F == &Carbon::M::F);
''';
// --- cpp_carbon.carbon
library "[[@TEST_NAME]]";
import Cpp;
fn F();
fn G() {
// TODO: Should we disallow this?
Cpp.Carbon.F();
}
// --- fail_carbon_cpp.carbon
library "[[@TEST_NAME]]";
import Cpp;
inline Cpp '''
void F();
void G() {
// This is not found because it looks for the identifier `Cpp`, not the keyword `Cpp`.
// CHECK:STDERR: fail_carbon_cpp.carbon:[[@LINE+4]]:11: error: no member named 'Cpp' in namespace 'Carbon' [CppInteropParseError]
// CHECK:STDERR: 14 | Carbon::Cpp::F();
// CHECK:STDERR: | ~~~~~~~~^
// CHECK:STDERR:
Carbon::Cpp::F();
}
''';
// --- fail_carbon_raw_cpp.carbon
library "[[@TEST_NAME]]";
import Cpp;
alias r#Cpp = Cpp;
inline Cpp '''
void FRaw();
void GRaw() {
// CHECK:STDERR: fail_carbon_raw_cpp.carbon:[[@LINE+8]]:16: error: semantics TODO: `interop with translation unit decl` [SemanticsTodo]
// CHECK:STDERR: Carbon::Cpp::FRaw();
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_carbon_raw_cpp.carbon:[[@LINE+4]]:11: error: no member named 'Cpp' in namespace 'Carbon' [CppInteropParseError]
// CHECK:STDERR: 19 | Carbon::Cpp::FRaw();
// CHECK:STDERR: | ~~~~~~~~^
// CHECK:STDERR:
Carbon::Cpp::FRaw();
}
''';