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base repository: python/cpython
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head repository: eendebakpt/cpython
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compare: pattern_match_class_v0
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  • 2 commits
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Commits on Feb 26, 2026

  1. Fast path for MATCH_CLASS zero argument case

    @eendebakpt
    eendebakpt committed Feb 26, 2026
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Commits on Jul 29, 2026

  1. Fix zero-pattern fast path: MATCH_CLASS pushes a tuple or None, not a… 

    … bool

POP_JUMP_IF_FALSE asserts an exact bool and only jumps on Py_False, so
the fail branch was never taken: `case C():` matched any subject in
release builds (and asserted in debug builds). Jump on None instead.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
    @eendebakpt @claude
    eendebakpt and claude committed Jul 29, 2026
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