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SystemError compiling __classdict__ class annotation #149805

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SystemError compiling __classdict__ class annotation#149805
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StanFromIreland
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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@StanFromIreland
StanFromIreland
opened on May 13, 2026

Bug report

Bug description:

>>> class _:
...     a: int
...     __classdict__: a
SystemError: compiler_lookup_arg(name='__classdict__') with reftype=5 failed in _; freevars of code __annotate__: ('__classdict__',)

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

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  1. StanFromIreland
    self-assigned this
    on May 13, 2026
  2. StanFromIreland
    added
    type-bugAn unexpected behavior, bug, or error
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on May 13, 2026
  3. StanFromIreland
    added 3 commits that reference this issue on Jun 2, 2026

    gh-149805: Fix `SystemError` when compiling `__classdict__` class ann…

    c52d2b1

    [3.15] gh-149805: Fix `SystemError` when compiling `__classdict__` cl…

    f8cea98

    [3.14] gh-149805: Fix `SystemError` when compiling `__classdict__` cl…

    522fe01
  4. StanFromIreland
    closed this as completedon Jun 5, 2026
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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