Description

StanFromIreland

opened on May 13, 2026

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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

Linked PRs

• gh-149805: Fix SystemError when compiling __classdict__ class annotation #149806
• [3.15] gh-149805: Fix SystemError when compiling __classdict__ class annotation (GH-149806) #150773
• [3.14] gh-149805: Fix SystemError when compiling __classdict__ class annotation (GH-149806) #150774

Activity

1. StanFromIreland

   self-assigned this

   on May 13, 2026
2. StanFromIreland

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(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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