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carbon-lang/toolchain/check/testdata/interop/cpp/cpp_diagnostics.carbon
T
Richard Smith f987504614 Track the location of the Cpp import for use in Clang diagnostics. (#5783) 
When diagnosing a problem with C++ code imported from Carbon, include
the location of the specific `import Cpp` statement that imported the
C++ code as part of the backtrace, rather than providing a location in a
generated file that doesn't exist on disk.

Also fix handling in autoupdate of check lines that contain multiple
file name and line number pairs to use the matched file name for
remapping of locations rather than the first file name in the line.
2025-07-09 00:47:21 +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/cpp_diagnostics.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/cpp_diagnostics.carbon
// ============================================================================
// One error
// ============================================================================
// --- one_error.h
#error "error1"
// --- fail_import_cpp_file_with_one_error.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_cpp_file_with_one_error.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./one_error.h:2: error: In file included from fail_import_cpp_file_with_one_error.carbon:[[@LINE+6]]:
// CHECK:STDERR: ./one_error.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
import Cpp library "one_error.h";
// ============================================================================
// Multiple errors
// ============================================================================
// --- multiple_errors.h
#error "error1"
#error "error2"
// --- fail_import_cpp_file_with_multiple_errors.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors.carbon:[[@LINE+14]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors.h:2: error: In file included from fail_import_cpp_file_with_multiple_errors.carbon:[[@LINE+13]]:
// CHECK:STDERR: ./multiple_errors.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors.h:3: error: In file included from fail_import_cpp_file_with_multiple_errors.carbon:[[@LINE+6]]:
// CHECK:STDERR: ./multiple_errors.h:3:2: error: "error2"
// CHECK:STDERR: 3 | #error "error2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
import Cpp library "multiple_errors.h";
// ============================================================================
// One warning
// ============================================================================
// --- one_warning.h
#warning "warning1"
// --- import_cpp_file_with_one_warning.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
// CHECK:STDERR: import_cpp_file_with_one_warning.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./one_warning.h:2: warning: In file included from import_cpp_file_with_one_warning.carbon:[[@LINE+6]]:
// CHECK:STDERR: ./one_warning.h:2:2: warning: "warning1"
// CHECK:STDERR: 2 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "one_warning.h";
//@dump-sem-ir-end
// ============================================================================
// Multiple warnings
// ============================================================================
// --- multiple_warnings.h
#warning "warning1"
#warning "warning2"
#warning "warning3"
// --- import_cpp_file_with_multiple_warnings.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
// CHECK:STDERR: import_cpp_file_with_multiple_warnings.carbon:[[@LINE+21]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_warnings.h:2: warning: In file included from import_cpp_file_with_multiple_warnings.carbon:[[@LINE+20]]:
// CHECK:STDERR: ./multiple_warnings.h:2:2: warning: "warning1"
// CHECK:STDERR: 2 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: import_cpp_file_with_multiple_warnings.carbon:[[@LINE+14]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_warnings.h:3: warning: In file included from import_cpp_file_with_multiple_warnings.carbon:[[@LINE+13]]:
// CHECK:STDERR: ./multiple_warnings.h:3:2: warning: "warning2"
// CHECK:STDERR: 3 | #warning "warning2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: import_cpp_file_with_multiple_warnings.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_warnings.h:4: warning: In file included from import_cpp_file_with_multiple_warnings.carbon:[[@LINE+6]]:
// CHECK:STDERR: ./multiple_warnings.h:4:2: warning: "warning3"
// CHECK:STDERR: 4 | #warning "warning3"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "multiple_warnings.h";
//@dump-sem-ir-end
// ============================================================================
// One error and one warning
// ============================================================================
// --- one_error_and_one_warning.h
#error "error1"
#warning "warning1"
// --- fail_import_cpp_file_with_one_error_and_one_warning.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_cpp_file_with_one_error_and_one_warning.carbon:[[@LINE+14]]:1: in import [InImport]
// CHECK:STDERR: ./one_error_and_one_warning.h:2: error: In file included from fail_import_cpp_file_with_one_error_and_one_warning.carbon:[[@LINE+13]]:
// CHECK:STDERR: ./one_error_and_one_warning.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_file_with_one_error_and_one_warning.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./one_error_and_one_warning.h:3: warning: In file included from fail_import_cpp_file_with_one_error_and_one_warning.carbon:[[@LINE+6]]:
// CHECK:STDERR: ./one_error_and_one_warning.h:3:2: warning: "warning1"
// CHECK:STDERR: 3 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "one_error_and_one_warning.h";
// ============================================================================
// Multiple errors and multiple warnings
// ============================================================================
// --- multiple_errors_and_multiple_warnings.h
#error "error1"
#error "error2"
#warning "warning1"
#warning "warning2"
#warning "warning3"
// --- fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+35]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:2: error: In file included from fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+34]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+28]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:3: error: In file included from fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+27]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:3:2: error: "error2"
// CHECK:STDERR: 3 | #error "error2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+21]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:4: warning: In file included from fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+20]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:4:2: warning: "warning1"
// CHECK:STDERR: 4 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+14]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:5: warning: In file included from fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+13]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:5:2: warning: "warning2"
// CHECK:STDERR: 5 | #warning "warning2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:6: warning: In file included from fail_import_cpp_file_with_multiple_errors_and_multiple_warnings.carbon:[[@LINE+6]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:6:2: warning: "warning3"
// CHECK:STDERR: 6 | #warning "warning3"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "multiple_errors_and_multiple_warnings.h";
// ============================================================================
// Multiple files with warnings
// ============================================================================
// --- import_multiple_cpp_files_with_warnings.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
// CHECK:STDERR: import_multiple_cpp_files_with_warnings.carbon:[[@LINE+28]]:1: in import [InImport]
// CHECK:STDERR: ./one_warning.h:2: warning: In file included from import_multiple_cpp_files_with_warnings.carbon:[[@LINE+27]]:
// CHECK:STDERR: ./one_warning.h:2:2: warning: "warning1"
// CHECK:STDERR: 2 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: import_multiple_cpp_files_with_warnings.carbon:[[@LINE+21]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_warnings.h:2: warning: In file included from import_multiple_cpp_files_with_warnings.carbon:[[@LINE+21]]:
// CHECK:STDERR: ./multiple_warnings.h:2:2: warning: "warning1"
// CHECK:STDERR: 2 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: import_multiple_cpp_files_with_warnings.carbon:[[@LINE+14]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_warnings.h:3: warning: In file included from import_multiple_cpp_files_with_warnings.carbon:[[@LINE+14]]:
// CHECK:STDERR: ./multiple_warnings.h:3:2: warning: "warning2"
// CHECK:STDERR: 3 | #warning "warning2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: import_multiple_cpp_files_with_warnings.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_warnings.h:4: warning: In file included from import_multiple_cpp_files_with_warnings.carbon:[[@LINE+7]]:
// CHECK:STDERR: ./multiple_warnings.h:4:2: warning: "warning3"
// CHECK:STDERR: 4 | #warning "warning3"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "one_warning.h";
import Cpp library "multiple_warnings.h";
//@dump-sem-ir-end
// ============================================================================
// Multiple files with errors and warnings
// ============================================================================
// --- fail_import_multiple_cpp_files_with_errors_and_warnings.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+49]]:1: in import [InImport]
// CHECK:STDERR: ./one_error_and_one_warning.h:2: error: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+48]]:
// CHECK:STDERR: ./one_error_and_one_warning.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+42]]:1: in import [InImport]
// CHECK:STDERR: ./one_error_and_one_warning.h:3: warning: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+41]]:
// CHECK:STDERR: ./one_error_and_one_warning.h:3:2: warning: "warning1"
// CHECK:STDERR: 3 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+35]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:2: error: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+35]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+28]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:3: error: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+28]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:3:2: error: "error2"
// CHECK:STDERR: 3 | #error "error2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+21]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:4: warning: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+21]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:4:2: warning: "warning1"
// CHECK:STDERR: 4 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+14]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:5: warning: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+14]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:5:2: warning: "warning2"
// CHECK:STDERR: 5 | #warning "warning2"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+7]]:1: in import [InImport]
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:6: warning: In file included from fail_import_multiple_cpp_files_with_errors_and_warnings.carbon:[[@LINE+7]]:
// CHECK:STDERR: ./multiple_errors_and_multiple_warnings.h:6:2: warning: "warning3"
// CHECK:STDERR: 6 | #warning "warning3"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "one_error_and_one_warning.h";
import Cpp library "multiple_errors_and_multiple_warnings.h";
// ============================================================================
// Indirect error
// ============================================================================
// --- indirect_error.h
#include "one_error.h"
// --- fail_todo_import_indirect_error.carbon
library "[[@TEST_NAME]]";
// TODO: The `In file included from` line should not be prefixed. See
// https://github.com/carbon-language/carbon-lang/pull/5614#pullrequestreview-2900939411
// CHECK:STDERR: fail_todo_import_indirect_error.carbon:[[@LINE+8]]:1: in import [InImport]
// CHECK:STDERR: ./one_error.h:2: error: In file included from fail_todo_import_indirect_error.carbon:[[@LINE+7]]:
// CHECK:STDERR: In file included from ./indirect_error.h:2:
// CHECK:STDERR: ./one_error.h:2:2: error: "error1"
// CHECK:STDERR: 2 | #error "error1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
import Cpp library "indirect_error.h";
// ============================================================================
// Indirect warning
// ============================================================================
// --- indirect_warning.h
#include "one_warning.h"
// --- todo_import_indirect_warning.carbon
library "[[@TEST_NAME]]";
// TODO: The `In file included from` line should not be prefixed. See
// https://github.com/carbon-language/carbon-lang/pull/5614#pullrequestreview-2900939411
//@dump-sem-ir-begin
// CHECK:STDERR: todo_import_indirect_warning.carbon:[[@LINE+8]]:1: in import [InImport]
// CHECK:STDERR: ./one_warning.h:2: warning: In file included from todo_import_indirect_warning.carbon:[[@LINE+7]]:
// CHECK:STDERR: In file included from ./indirect_warning.h:2:
// CHECK:STDERR: ./one_warning.h:2:2: warning: "warning1"
// CHECK:STDERR: 2 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
import Cpp library "indirect_warning.h";
//@dump-sem-ir-end
// ============================================================================
// Lexer error before import
// ============================================================================
// --- fail_import_cpp_library_lexer_error.carbon
library "[[@TEST_NAME]]"; // Trailing comment
// TODO: Move this warning to be after the lexer trailing comment error.
// CHECK:STDERR: fail_import_cpp_library_lexer_error.carbon:[[@LINE+11]]:1: in import [InImport]
// CHECK:STDERR: ./one_warning.h:2: warning: In file included from fail_import_cpp_library_lexer_error.carbon:[[@LINE+10]]:
// CHECK:STDERR: ./one_warning.h:2:2: warning: "warning1"
// CHECK:STDERR: 2 | #warning "warning1"
// CHECK:STDERR: | ^
// CHECK:STDERR: [CppInteropParseWarning]
// CHECK:STDERR:
// CHECK:STDERR: fail_import_cpp_library_lexer_error.carbon:[[@LINE-10]]:44: error: trailing comments are not permitted [TrailingComment]
// CHECK:STDERR: library "import_cpp_library_lexer_error"; // Trailing comment
// CHECK:STDERR: ^
// CHECK:STDERR:
import Cpp library "one_warning.h";
// ============================================================================
// Diagnostic with fix-it hints
// ============================================================================
// --- fix_it_hints.h
double score = 0.1
// --- fail_import_fix_it_hints.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_import_fix_it_hints.carbon:[[@LINE+8]]:1: in import [InImport]
// CHECK:STDERR: ./fix_it_hints.h:2: error: In file included from fail_import_fix_it_hints.carbon:[[@LINE+7]]:
// CHECK:STDERR: ./fix_it_hints.h:2:19: error: expected ';' after top level declarator
// CHECK:STDERR: 2 | double score = 0.1
// CHECK:STDERR: | ^
// CHECK:STDERR: | ;
// CHECK:STDERR: [CppInteropParseError]
// CHECK:STDERR:
import Cpp library "fix_it_hints.h";
fn F() {
Cpp.foo();
}
// CHECK:STDOUT: --- import_cpp_file_with_one_warning.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "one_warning.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_cpp_file_with_multiple_warnings.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "multiple_warnings.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_multiple_cpp_files_with_warnings.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "one_warning.h"
// CHECK:STDOUT: import Cpp "multiple_warnings.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- todo_import_indirect_warning.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %Cpp.import_cpp = import_cpp {
// CHECK:STDOUT: import Cpp "indirect_warning.h"
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
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