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[PEP 695] Fix incorrect Variance Computation with Polymorphic Methods. #19466

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[PEP 695] Fix incorrect Variance Computation with Polymorphic Methods. #19466

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d7b88cc
use plain_self as subtitution type for self
randolf-scholz Jul 16, 2025
a0b037e
Update mypy/subtypes.py
randolf-scholz Jul 16, 2025
ab680d1
Merge branch 'master' into fix_variance_polymorphic_constructor
randolf-scholz Jul 16, 2025
0f33c79
Merge branch 'master' into fix_variance_polymorphic_constructor
randolf-scholz Jul 27, 2025
5d16a08
Merge branch 'master' into fix_variance_polymorphic_constructor
randolf-scholz Jul 28, 2025
25e8efa
Merge branch 'master' into fix_variance_polymorphic_constructor
randolf-scholz Aug 4, 2025
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Update mypy/subtypes.py 
Co-authored-by: Stanislav Terliakov <50529348+sterliakov@users.noreply.github.com>
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@randolf-scholz @sterliakov
randolf-scholz and sterliakov authored Jul 16, 2025
commit a0b037eec1405a69528a8de531ac98324a598831
2 changes: 1 addition & 1 deletion mypy/subtypes.py
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Expand Up @@ -2208,7 +2208,7 @@ def infer_variance(info: TypeInfo, i: int) -> bool:
settable = False

# TODO: handle settable properties with setter type different from getter.
plain_self = Instance(info.mro[0], []) # self-type without type variables
plain_self = fill_typevars_with_any(info) # self-type without type variables
typ = find_member(member, self_type, plain_self)
if typ:
# It's okay for a method in a generic class with a contravariant type
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