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[ty] Ban protocols from inheriting from non-protocol generic classes (#19941)

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Alex Waygood 2025-08-16 19:38:43 +01:00 • committed by GitHub
parent f4d8826428
commit 9ac39cee98
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2 changed files with 15 additions and 10 deletions
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crates/ty_python_semantic/resources/mdtest/protocols.md
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@ -150,6 +150,14 @@ class AlsoInvalid(MyProtocol, OtherProtocol, NotAProtocol, Protocol): ...
# revealed: tuple[<class 'AlsoInvalid'>, <class 'MyProtocol'>, <class 'OtherProtocol'>, <class 'NotAProtocol'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(AlsoInvalid.__mro__)
class NotAGenericProtocol[T]: ...
# error: [invalid-protocol] "Protocol class `StillInvalid` cannot inherit from non-protocol class `NotAGenericProtocol`"
class StillInvalid(NotAGenericProtocol[int], Protocol): ...
# revealed: tuple[<class 'StillInvalid'>, <class 'NotAGenericProtocol[int]'>, typing.Protocol, typing.Generic, <class 'object'>]
reveal_type(StillInvalid.__mro__)
```
But two exceptions to this rule are `object` and `Generic`: