parser: Fix panic in 'const impl' recovery #81876
Merged
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The panic happens when in recovery parsing a full
impl
(
parse_item_impl
) fails and we drop theDiagnosticBuilder
for therecovery suggestion and return the
parse_item_impl
error.We now raise the original error "expected identifier found
impl
" whenparsing the
impl
fails.Note that the regression test is slightly simplified version of the
original repro in #81806, to make the error output smaller and more
resilient to unrelated changes in parser error messages.
Fixes #81806