[issue44396] pegen _PyParser_ASTFromFile(): Use-After-Free in syntaxerror()

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Lysandros and Pablo, this *only* occurs when the lexer is reading directly from a file, not when it's reading the same source code from a (bytes) string. All examples are syntax errors (some raise ValueError in the parser).

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<https://bugs.python.org/issue44396>
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