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Incorrect missing-attribute when valid class attribute is included in __slots__ #2444
Description
Describe the Bug
Example:
class Foo:
__slots__ = ["__name__"]
def __init__(self):
self.__name__ = "foo_instance"
print(Foo.__name__)Runtime result:
$ python test.py
Foo
pyrefly check result:
$ pyrefly check test.py
ERROR Instance-only attribute `__name__` of class `Foo` is not visible on the class [missing-attribute]
--> test.py:7:7
|
8 | print(Foo.__name__)
| ^^^^^^^^^^^^
|
INFO 1 error
Sandbox Link
(Only applicable for extension issues) IDE Information
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Activity
rchen152 commentedon Feb 16, 2026
Thanks for the report! This looks related to #630. We currently have no, or very minimal, support for
__slots__, I believe.__slots__#630yangdanny97 commentedon Mar 18, 2026
#630 is closed but the bug still repros
fix false positive for `__slots__` when attribute is defined on metac…