https://github.com/python/cpython/commit/c52d2b16ddda3995f0f935b1a3815f1aac498da6
commit: c52d2b16ddda3995f0f935b1a3815f1aac498da6
branch: main
author: Stan Ulbrych <[email protected]>
committer: StanFromIreland <[email protected]>
date: 2026-06-02T10:17:03+01:00
summary:
gh-149805: Fix `SystemError` when compiling `__classdict__` class annotation
(#149806)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-05-13-21-26-26.gh-issue-149805.IG6cza.rst
M Lib/test/test_type_annotations.py
M Python/symtable.c
diff --git a/Lib/test/test_type_annotations.py
b/Lib/test/test_type_annotations.py
index d459f497e333e6..b751f825bb97d5 100644
--- a/Lib/test/test_type_annotations.py
+++ b/Lib/test/test_type_annotations.py
@@ -485,6 +485,13 @@ def test_comprehension_in_annotation(self):
ns = run_code("x: [y for y in range(10)]")
self.assertEqual(ns["__annotate__"](1), {"x": list(range(10))})
+ def test_class_annotation_dunder_classdict(self):
+ ns = run_code("""
+ class C:
+ __classdict__: int
+ """)
+ self.assertEqual(ns["C"].__annotations__, {"__classdict__": int})
+
def test_future_annotations(self):
code = """
from __future__ import annotations
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-05-13-21-26-26.gh-issue-149805.IG6cza.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-05-13-21-26-26.gh-issue-149805.IG6cza.rst
new file mode 100644
index 00000000000000..02d050840ee1f9
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-05-13-21-26-26.gh-issue-149805.IG6cza.rst
@@ -0,0 +1,2 @@
+Fix a :exc:`SystemError` when compiling a compiling ``__classdict__`` class
+annotation. Found by OSS-Fuzz in :oss-fuzz:`512907042`.
diff --git a/Python/symtable.c b/Python/symtable.c
index 14d7ce91b62835..070e374101b5cd 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -2870,6 +2870,7 @@ symtable_visit_annotation(struct symtable *st, expr_ty
annotation, void *key)
int future_annotations = st->st_future->ff_features &
CO_FUTURE_ANNOTATIONS;
if (current_type == ClassBlock && !future_annotations) {
st->st_cur->ste_can_see_class_scope = 1;
+ parent_ste->ste_needs_classdict = 1;
if (!symtable_add_def(st, &_Py_ID(__classdict__), USE,
LOCATION(annotation))) {
return 0;
}
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