bpo-41667: Fix 'gather' rules in the python parser generator #22021
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Currently, empty sequences in gather rules make the conditional for gather rules fail as empty sequences evaluate as "False". We need to explicitly check for "None" (the failure condition) to avoid false negatives.
pablogsal
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Originally found by @gvanrossum in we-like-parsers/pegen@4ecf01e |
gvanrossum
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Aug 30, 2020
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Thanks @pablogsal for the PR 🌮🎉.. I'm working now to backport this PR to: 3.9. |
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Sorry @pablogsal, I had trouble checking out the |
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Currently, empty sequences in gather rules make the conditional for gather rules fail as empty sequences evaluate as "False". We need to explicitly check for "None" (the failure condition) to avoid false negatives. (cherry picked from commit e55a0e9) Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
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GH-22080 is a backport of this pull request to the 3.9 branch. |
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…H-22080) Currently, empty sequences in gather rules make the conditional for gather rules fail as empty sequences evaluate as "False". We need to explicitly check for "None" (the failure condition) to avoid false negatives. (cherry picked from commit e55a0e9) Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
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…lots1 * origin/master: (63 commits) bpo-41627: Distinguish 32 and 64-bit user site packages on Windows (pythonGH-22098) bpo-38585: Remove references to defusedexpat (pythonGH-22095) bpo-41721: Add xlc options (pythonGH-22096) bpo-40486: Specify what happens if directory content change diring iteration (pythonGH-22025) bpo-41638: Improve ProgrammingError message for absent parameter. (pythonGH-21999) bpo-41713: _signal doesn't use multi-phase init (pythonGH-22087) bpo-41700: Skip test if the locale is not supported (pythonGH-22081) [doc] Update documentation on logging optimization. (pythonGH-22075) Fix 'gather' rules in the python parser generator (pythonGH-22021) bpo-41697: Correctly handle KeywordOrStarred when parsing arguments in the parser (pythonGH-22077) [doc] Fix a typo in the graphlib docs (python#22030) bpo-1635741: Port _signal module to multi-phase init (PEP 489) (pythonGH-22049) bpo-39883: Use BSD0 license for code in docs (pythonGH-17635) bpo-39010: Improve test shutdown (python#22066) bpo-41696: Fix handling of debug mode in asyncio.run (python#22069) bpo-41690: Use a loop to collect args in the parser instead of recursion (pythonGH-22053) closes bpo-41689: Preserve text signature from tp_doc in C heap type creation. (pythonGH-22058) Fix invalid escape sequences in the peg_highlight Sphinx extension (pythonGH-22047) bpo-41675: Modernize siginterrupt calls (pythonGH-22028) bpo-41685: Don't pin setuptools version anymore in Doc/Makefile (pythonGH-22062) ...
xzy3
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Oct 18, 2020
Currently, empty sequences in gather rules make the conditional for gather rules fail as empty sequences evaluate as "False". We need to explicitly check for "None" (the failure condition) to avoid false negatives.
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Currently, empty sequences in gather rules make the conditional for
gather rules fail as empty sequences evaluate as "False". We need to
explicitly check for "None" (the failure condition) to avoid false
negatives.
https://bugs.python.org/issue41667