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Track the start of a signature more accurately (#6760)

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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.
This commit is contained in:
Geoff Romer
2026-02-23 22:46:03 +00:00
committed by GitHub
parent 375a736c42
commit 4a0cf6c1fb
282 changed files with 1041 additions and 1039 deletions
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toolchain/parse/testdata/match/fail_missing_case_pattern.carbon
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+2 -2
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@@ -23,7 +23,7 @@ fn f() -> i32 {
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'f'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'f'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
@@ -35,7 +35,7 @@ fn f() -> i32 {
// CHECK:STDOUT: {kind: 'MatchCondition', text: ')', subtree_size: 3},
// CHECK:STDOUT: {kind: 'MatchStatementStart', text: '{', subtree_size: 5},
// CHECK:STDOUT: {kind: 'MatchCaseIntroducer', text: 'case'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: '=>', has_error: yes},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: '=>', has_error: yes},
// CHECK:STDOUT: {kind: 'InvalidParse', text: '=>', has_error: yes},
// CHECK:STDOUT: {kind: 'LetBindingPattern', text: '=>', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'MatchCaseStart', text: '=>', has_error: yes, subtree_size: 5},