Skip to content

SystemError on __classdict__/__conditional_annotations__ in class-scope inlined comprehensions #145701

Closed
Closed
SystemError on __classdict__/__conditional_annotations__ in class-scope inlined comprehensions#145701
Labels
interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

Description

@StanFromIreland
StanFromIreland
opened on Mar 9, 2026

Bug report

Bug description:

Found by OSS Fuzz in #491105000.

>>> class i: [__classdict__ for x in y]
SystemError: _PyST_GetScope(name='__classdict__') failed: unknown scope in unit <module> (93973616364240); symbols: {'i': 4098}; locals: {}; globals: {}
>>> class i: [__conditional_annotations__ for x in y]
SystemError: _PyST_GetScope(name='__conditional_annotations__') failed: unknown scope in unit <module> (94200568314576); symbols: {'i': 4098}; locals: {}; globals: {}

We need to expand the fix for __class__ (fedbf77), I will open a PR shortly.

CPython versions tested on:

3.14, CPython main branch

Operating systems tested on:

No response

Linked PRs

Activity

  1. StanFromIreland
    added
    type-bugAn unexpected behavior, bug, or error
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Mar 9, 2026
  2. StanFromIreland
    added a commit that references this issue on Mar 9, 2026

    pythongh-145701: Fix `__classdict__` & `__conditional_annotations__` …

    2638425
  3. gpshead
    added a commit that references this issue on Mar 9, 2026

    gh-145701: Fix `__classdict__` & `__conditional_annotations__` in cla…

    63eaaf9
  4. miss-islington
    added 2 commits that reference this issue on Mar 9, 2026

    pythongh-145701: Fix `__classdict__` & `__conditional_annotations__` …

    00b513a

    pythongh-145701: Fix `__classdict__` & `__conditional_annotations__` …

    2165847
  5. JelleZijlstra
    added a commit that references this issue on Mar 9, 2026

    [3.14] gh-145701: Fix `__classdict__` & `__conditional_annotations__`…

    0db2bee
  6. gpshead
    added a commit that references this issue on Mar 9, 2026

    [3.13] gh-145701: Fix `__classdict__` & `__conditional_annotations__`…

    321daab

  7. gpshead commented on Mar 9, 2026

    @gpshead
    gpshead
    on Mar 9, 2026
    Member

    thanks!

  8. gpshead
    closed this as completedon Mar 9, 2026
  9. ljfp
    added a commit that references this issue on Apr 25, 2026

    pythongh-145701: Fix `__classdict__` & `__conditional_annotations__` …

    00b4e0c
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions