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carbon-lang/toolchain/parse/testdata/function/extern.carbon
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Geoff Romer 4a0cf6c1fb Track the start of a signature more accurately (#6760) 
This change ensures that a function signature always starts with an
`IdentifierNameMaybeBeforeSignature` node (renamed from
`IdentifierNameBeforeParams`), even in the case of function declarations
like `fn F -> T` that have no parameter list. As a consequence, this
ensures that we push new entries onto `pattern_block_stack` and
`full_pattern_stack` when we start processing the function signature.
2026-02-23 22:46:03 +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/function/extern.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/function/extern.carbon
// --- extern.carbon
extern fn G();
// --- library.carbon
extern library "foo" fn G();
// --- default_library.carbon
extern library default fn G();
// --- fail_name_missing.carbon
// CHECK:STDERR: fail_name_missing.carbon:[[@LINE+4]]:16: error: expected `default` or a string literal to specify the library name [ExpectedLibraryNameOrDefault]
// CHECK:STDERR: extern library fn G();
// CHECK:STDERR: ^~
// CHECK:STDERR:
extern library fn G();
// --- fail_identifier.carbon
// CHECK:STDERR: fail_identifier.carbon:[[@LINE+8]]:16: error: expected `default` or a string literal to specify the library name [ExpectedLibraryNameOrDefault]
// CHECK:STDERR: extern library foo fn G();
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_identifier.carbon:[[@LINE+4]]:16: error: unrecognized declaration introducer [UnrecognizedDecl]
// CHECK:STDERR: extern library foo fn G();
// CHECK:STDERR: ^~~
// CHECK:STDERR:
extern library foo fn G();
// --- extern_def.carbon
extern fn G() {}
// --- library_def.carbon
extern library "foo" fn G() {}
// CHECK:STDOUT: - filename: extern.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'ExternModifier', text: 'extern'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: library.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'LibraryName', text: '"foo"'},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ExternModifierWithLibrary', text: 'extern', subtree_size: 3},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: default_library.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'DefaultLibrary', text: 'default'},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ExternModifierWithLibrary', text: 'extern', subtree_size: 3},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_name_missing.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'LibraryName', text: 'fn', has_error: yes},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ExternModifierWithLibrary', text: 'extern', subtree_size: 3},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_identifier.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'InvalidParseStart', text: 'foo', has_error: yes},
// CHECK:STDOUT: {kind: 'LibraryName', text: 'foo', has_error: yes},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ExternModifierWithLibrary', text: 'extern', subtree_size: 3},
// CHECK:STDOUT: {kind: 'InvalidParseSubtree', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: extern_def.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'ExternModifier', text: 'extern'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: library_def.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'LibraryName', text: '"foo"'},
// CHECK:STDOUT: {kind: 'LibrarySpecifier', text: 'library', subtree_size: 2},
// CHECK:STDOUT: {kind: 'ExternModifierWithLibrary', text: 'extern', subtree_size: 3},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 9},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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