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bpo-40661: Fix segfault when parsing invalid input (pythonGH-20165)
Fix segfaults when parsing very complex invalid input, like `import äˆ ð£„¯ð¢·žð±‹á”€ð””ð‘©±å®ä±¬ð©¾\nð—¶½`. Co-authored-by: Guido van Rossum <guido@python.org> Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
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‎Lib/test/test_peg_parser.py‎

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@@ -591,6 +591,7 @@ def f(*a, b):
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("f-string_single_closing_brace", "f'}'"),
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("from_import_invalid", "from import import a"),
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("from_import_trailing_comma", "from a import b,"),
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("import_non_ascii_syntax_error", "import ä £"),
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# This test case checks error paths involving tokens with uninitialized
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# values of col_offset and end_col_offset.
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("invalid indentation",

‎Lib/test/test_syntax.py‎

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Traceback (most recent call last):
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SyntaxError: cannot assign to __debug__
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>>> import ä £
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Traceback (most recent call last):
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SyntaxError: invalid character '£' (U+00A3)
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"""
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import re

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