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Avoid consuming a token after an invalid match_first opening (#7538)

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If the `match_first` is not followed by `{` avoid consuming whatever
comes after it. Recover by leaving whatever comes next alone. It could
even be the `FileEnd` token, and then we would crash when we read off
the end of the token stream looking for `FileEnd`.
This commit is contained in:
Dana Jansens
2026-07-20 19:09:16 +00:00
committed by GitHub
parent 99cda60df7
commit 085e45093e
2 changed files with 24 additions and 2 deletions
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toolchain/parse/testdata/generics/impl/match_first.carbon
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+18 -1
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@@ -20,6 +20,14 @@ match_first {}
// CHECK:STDERR:
match_first;
// --- fail_eof.carbon
match_first
// CHECK:STDERR: fail_eof.carbon:[[@LINE+4]]:1: error: expected `{` after `match_first` [ExpectedCurlyBraceAfter]
// CHECK:STDERR:
// CHECK:STDERR: ^
// CHECK:STDERR:
// --- with_impls.carbon
match_first {
@@ -47,7 +55,16 @@ impl forall [T: J] T as Interface {
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'MatchFirstIntroducer', text: 'match_first'},
// CHECK:STDOUT: {kind: 'MatchFirstDefinitionStart', text: 'match_first', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'MatchFirst', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'MatchFirst', text: 'match_first', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'EmptyDecl', text: ';'},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_eof.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'MatchFirstIntroducer', text: 'match_first'},
// CHECK:STDOUT: {kind: 'MatchFirstDefinitionStart', text: 'match_first', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'MatchFirst', text: 'match_first', has_error: yes, subtree_size: 3},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: with_impls.carbon