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[red-knot] Improve error message for metaclass conflict (#14174)

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Alex Waygood
2024-11-08 11:58:57 +00:00
committed by GitHub
parent fbf140a665
commit 953e862aca
3 changed files with 94 additions and 30 deletions
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crates/red_knot_python_semantic/resources/mdtest/metaclass.md
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@@ -65,7 +65,7 @@ class M2(type): ...
class A(metaclass=M1): ...
class B(metaclass=M2): ...
# error: [conflicting-metaclass] "The metaclass of a derived class (`C`) must be a subclass of the metaclasses of all its bases, but `M1` and `M2` have no subclass relationship"
# error: [conflicting-metaclass] "The metaclass of a derived class (`C`) must be a subclass of the metaclasses of all its bases, but `M1` (metaclass of base class `A`) and `M2` (metaclass of base class `B`) have no subclass relationship"
class C(A, B): ...
reveal_type(C.__class__) # revealed: Unknown
@@ -82,7 +82,7 @@ class M1(type): ...
class M2(type): ...
class A(metaclass=M1): ...
# error: [conflicting-metaclass] "The metaclass of a derived class (`B`) must be a subclass of the metaclasses of all its bases, but `M2` and `M1` have no subclass relationship"
# error: [conflicting-metaclass] "The metaclass of a derived class (`B`) must be a subclass of the metaclasses of all its bases, but `M2` (metaclass of `B`) and `M1` (metaclass of base class `A`) have no subclass relationship"
class B(A, metaclass=M2): ...
reveal_type(B.__class__) # revealed: Unknown
@@ -126,7 +126,7 @@ class A(metaclass=M1): ...
class B(metaclass=M2): ...
class C(metaclass=M12): ...
# error: [conflicting-metaclass] "The metaclass of a derived class (`D`) must be a subclass of the metaclasses of all its bases, but `M1` and `M2` have no subclass relationship"
# error: [conflicting-metaclass] "The metaclass of a derived class (`D`) must be a subclass of the metaclasses of all its bases, but `M1` (metaclass of base class `A`) and `M2` (metaclass of base class `B`) have no subclass relationship"
class D(A, B, C): ...
reveal_type(D.__class__) # revealed: Unknown