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carbon-lang/toolchain/parse/testdata/packages/import/cpp_inline.carbon
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Richard Smith 8b59e85b16 Add support for inline Cpp declarations. (#6994) 
For #6830, add support for inline C++ fragments as a declaration rather
than as a packaging directive. For now, this uses `inline Cpp
<string-literal>;` as syntax. The prior `import Cpp inline
<string-literal>;` is left alone for the time being. We can decide
separately whether to remove that.

`inline Cpp` requires that there was at least one `import Cpp`. It's not
clear to me if that's the right design long-term, but it seems
reasonable for now.

Assisted-by: Gemini via Google Antigravity
2026-03-31 22:27:43 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/packages/import/cpp_inline.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/packages/import/cpp_inline.carbon
// --- fail_bad_syntax.carbon
// CHECK:STDERR: fail_bad_syntax.carbon:[[@LINE+4]]:18: error: expected string literal after `inline` [ExpectedStringAfterInline]
// CHECK:STDERR: import Cpp inline;
// CHECK:STDERR: ^
// CHECK:STDERR:
import Cpp inline;
// CHECK:STDERR: fail_bad_syntax.carbon:[[@LINE+4]]:19: error: expected string literal after `inline` [ExpectedStringAfterInline]
// CHECK:STDERR: import Cpp inline library "foo.h";
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
import Cpp inline library "foo.h";
// TODO: We might want to allow this as a "preprocessed source" syntax.
// CHECK:STDERR: fail_bad_syntax.carbon:[[@LINE+4]]:28: error: `import` declarations must end with a `;` [ExpectedDeclSemi]
// CHECK:STDERR: import Cpp library "foo.h" inline "bar";
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
import Cpp library "foo.h" inline "bar";
// CHECK:STDERR: fail_bad_syntax.carbon:[[@LINE+4]]:24: error: `import` declarations must end with a `;` [ExpectedDeclSemi]
// CHECK:STDERR: import library "foo.h" inline "bar";
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
import library "foo.h" inline "bar";
// --- fail_no_semi_at_eof.carbon
import Cpp inline
// CHECK:STDERR: fail_no_semi_at_eof.carbon:[[@LINE+4]]:1: error: expected string literal after `inline` [ExpectedStringAfterInline]
// CHECK:STDERR:
// CHECK:STDERR: ^
// CHECK:STDERR:
// --- fail_package_inline.carbon
// CHECK:STDERR: fail_package_inline.carbon:[[@LINE+4]]:16: error: `package` declarations must end with a `;` [ExpectedDeclSemi]
// CHECK:STDERR: package NotCpp inline "int n;";
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
package NotCpp inline "int n;";
// --- fail_library_inline.carbon
// CHECK:STDERR: fail_library_inline.carbon:[[@LINE+4]]:17: error: `library` declarations must end with a `;` [ExpectedDeclSemi]
// CHECK:STDERR: library "foo.h" inline "int n;";
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
library "foo.h" inline "int n;";
// --- wrong_package.carbon
// We reject this in check.
import NotCpp inline "bar";
// --- valid_syntax.carbon
import Cpp inline "int m;";
import Cpp inline '''
// C++ comment.
int n;
''';
// --- inline_cpp.carbon
inline Cpp '''
int n;
''';
// --- fail_inline_cpp_syntax_errors.carbon
// CHECK:STDERR: fail_inline_cpp_syntax_errors.carbon:[[@LINE+4]]:7: error: expected `Cpp` after `inline` [ExpectedCppAfterInline]
// CHECK:STDERR: inline;
// CHECK:STDERR: ^
// CHECK:STDERR:
inline;
// CHECK:STDERR: fail_inline_cpp_syntax_errors.carbon:[[@LINE+4]]:8: error: expected `Cpp` after `inline` [ExpectedCppAfterInline]
// CHECK:STDERR: inline '''
// CHECK:STDERR: ^~~
// CHECK:STDERR:
inline '''
int n;
''';
// CHECK:STDERR: fail_inline_cpp_syntax_errors.carbon:[[@LINE+4]]:11: error: expected string literal after `inline Cpp` [ExpectedStringAfterInlineCpp]
// CHECK:STDERR: inline Cpp;
// CHECK:STDERR: ^
// CHECK:STDERR:
inline Cpp;
// CHECK:STDERR: fail_inline_cpp_syntax_errors.carbon:[[@LINE+4]]:12: error: expected string literal after `inline Cpp` [ExpectedStringAfterInlineCpp]
// CHECK:STDERR: inline Cpp x;
// CHECK:STDERR: ^
// CHECK:STDERR:
inline Cpp x;
inline Cpp '''
int n;
'''
// CHECK:STDERR: fail_inline_cpp_syntax_errors.carbon:[[@LINE+4]]:1: error: `inline` declarations must end with a `;` [ExpectedDeclSemi]
// CHECK:STDERR:
// CHECK:STDERR: ^
// CHECK:STDERR:
// --- eof.carbon
// This split exists to avoid the "no `;` at EOF" diagnostic above pointing to
// the last CHECK:STDOUT line below.
// CHECK:STDOUT: - filename: fail_bad_syntax.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: ';', has_error: yes},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: 'library', has_error: yes},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'LibraryName', text: '"foo.h"'},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'LibraryName', text: '"foo.h"'},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_no_semi_at_eof.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: '', has_error: yes},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: 'inline', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_package_inline.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'PackageIntroducer', text: 'package'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'NotCpp'},
// CHECK:STDOUT: {kind: 'PackageDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_library_inline.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'LibraryIntroducer', text: 'library'},
// CHECK:STDOUT: {kind: 'LibraryName', text: '"foo.h"'},
// CHECK:STDOUT: {kind: 'LibraryDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: wrong_package.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'IdentifierPackageName', text: 'NotCpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: '"bar"'},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: valid_syntax.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: '"int m;"'},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', subtree_size: 5},
// CHECK:STDOUT: {kind: 'ImportIntroducer', text: 'import'},
// CHECK:STDOUT: {kind: 'CppPackageName', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: ''''
// CHECK:STDOUT: // C++ comment.
// CHECK:STDOUT: int n;
// CHECK:STDOUT: ''''},
// CHECK:STDOUT: {kind: 'InlineImportSpecifier', text: 'inline', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ImportDecl', text: ';', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: inline_cpp.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'InlineIntroducer', text: 'inline'},
// CHECK:STDOUT: {kind: 'CppNameExpr', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: ''''
// CHECK:STDOUT: int n;
// CHECK:STDOUT: ''''},
// CHECK:STDOUT: {kind: 'InlineCppDecl', text: ';', subtree_size: 4},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_inline_cpp_syntax_errors.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'InlineIntroducer', text: 'inline'},
// CHECK:STDOUT: {kind: 'InlineCppDecl', text: ';', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'InlineIntroducer', text: 'inline'},
// CHECK:STDOUT: {kind: 'InlineCppDecl', text: ';', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'InlineIntroducer', text: 'inline'},
// CHECK:STDOUT: {kind: 'CppNameExpr', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineCppDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'InlineIntroducer', text: 'inline'},
// CHECK:STDOUT: {kind: 'CppNameExpr', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineCppDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'InlineIntroducer', text: 'inline'},
// CHECK:STDOUT: {kind: 'CppNameExpr', text: 'Cpp'},
// CHECK:STDOUT: {kind: 'InlineImportBody', text: ''''
// CHECK:STDOUT: int n;
// CHECK:STDOUT: ''''},
// CHECK:STDOUT: {kind: 'InlineCppDecl', text: ''''
// CHECK:STDOUT: int n;
// CHECK:STDOUT: '''', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: eof.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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