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Mypy does not detect metaclass conflicts #13563
Description
Minimal reproducer:
class MyMeta1(type): ...
class MyMeta2(type): ...
class A(metaclass=MyMeta1): ...
class B(metaclass=MyMeta2): ...
class C(A, B): ...In runtime it causes:
» python ex.py
Traceback (most recent call last):
File "ex.py", line 5, in <module>
class C(A, B): ...
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its basesBut, mypy is fine with it:
» mypy ex.py --strict
Success: no issues found in 1 source fileImportant note: I think this should only work outside of stubs, because we do some extra metaclass hackery (like ABCMeta) in stubs. Moreover, in stubs - it won't raise.
Related #13561
Activity
Detect metaclass conflicts, refs python#13563
Detect metaclass conflicts, refs python#13563
Detect metaclass conflicts, refs python#13563