Fix decorated methods with self-types in protocols #19484
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Diff from mypy_primer, showing the effect of this PR on open source code: steam.py (https://github.com/Gobot1234/steam.py)
- steam/chat.py:402: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Chat[ChatMessageT, ClanT, GroupT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:402: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Chat[ChatMessageT, ClanT, GroupT]]"; expected "type[Never]" [arg-type]
- steam/chat.py:589: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:589: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Never]" [arg-type]
- steam/chat.py:608: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:608: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Never]" [arg-type]
- steam/chat.py:643: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:643: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Never]" [arg-type]
- steam/chat.py:688: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:688: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Never]" [arg-type]
- steam/chat.py:696: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:696: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Never]" [arg-type]
- steam/chat.py:869: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Self]" [arg-type]
+ steam/chat.py:869: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ChatGroup[MemberT, ChatT, ChatGroupTypeT]]"; expected "type[Never]" [arg-type]
+ steam/state.py:1470: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[GroupChannel]"; expected "type[Never]" [arg-type]
+ steam/state.py:1470: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ClanChannel]"; expected "type[Never]" [arg-type]
+ steam/state.py:1509: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[GroupChannel]"; expected "type[Never]" [arg-type]
+ steam/state.py:1509: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[ClanChannel]"; expected "type[Never]" [arg-type]
+ steam/state.py:2277: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Commentable]"; expected "type[Never]" [arg-type]
+ steam/state.py:2289: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Commentable]"; expected "type[Never]" [arg-type]
+ steam/state.py:2304: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[OwnerT]"; expected "type[Never]" [arg-type]
+ steam/state.py:2328: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Commentable]"; expected "type[Never]" [arg-type]
+ steam/state.py:2339: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Commentable]"; expected "type[Never]" [arg-type]
+ steam/state.py:2426: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Awardable[int]]"; expected "type[Never]" [arg-type]
- steam/state.py:2439: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Awardable[int]]"; expected "type[type[Awardable[int]]]" [arg-type]
+ steam/state.py:2439: error: Argument 2 to "__get__" of "classproperty" has incompatible type "type[Awardable[int]]"; expected "type[Never]" [arg-type]
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hauntsaninja
approved these changes
Jul 20, 2025
sterliakov
approved these changes
Jul 21, 2025
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Fixes #19482
The regression is caused by overlap of three problems (directly or indirectly):
mx.original_typeinstead ofmx.self_typefor expanding (not otherwise bound) self-types....vs self-types in constraint inference.I fix the first one, and limit the blast radius of the second one.