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[3.12] gh-109114: Relax the check for invalid lambdas inside f-strings to avoid false positives (GH-109121). (#109155)

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(cherry picked from commit 5bda2f637e)

Signed-off-by: Pablo Galindo <pablogsal@gmail.com>
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Pablo Galindo Salgado 2023-09-12 16:52:25 +01:00 • committed by GitHub
parent 8208657f3d
commit 21f4e6d6cb
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4 changed files with 1697 additions and 1749 deletions
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@ -1170,7 +1170,7 @@ invalid_expression:
_PyPegen_check_legacy_stmt(p, a) ? NULL : p->tokens[p->mark-1]->level == 0 ? NULL :
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "invalid syntax. Perhaps you forgot a comma?") }
| a=disjunction 'if' b=disjunction !('else'|':') { RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "expected 'else' after 'if' expression") }
| a='lambda' [lambda_params] b=':' &(FSTRING_MIDDLE | fstring_replacement_field) {
| a='lambda' [lambda_params] b=':' &FSTRING_MIDDLE {
RAISE_SYNTAX_ERROR_KNOWN_RANGE(a, b, "f-string: lambda expressions are not allowed without parentheses") }
invalid_named_expression(memo):