[red-knot] Fixes to Type::to_meta_type (#14942)

crates/red_knot_python_semantic/resources/mdtest/metaclass.md

@@ -194,3 +194,26 @@ class A[T: str](metaclass=M): ...
 
 reveal_type(A.__class__)  # revealed: Literal[M]
 ```
+
+## Metaclasses of metaclasses
+
+```py
+class Foo(type): ...
+class Bar(type, metaclass=Foo): ...
+class Baz(type, metaclass=Bar): ...
+class Spam(metaclass=Baz): ...
+
+reveal_type(Spam.__class__)  # revealed: Literal[Baz]
+reveal_type(Spam.__class__.__class__)  # revealed: Literal[Bar]
+reveal_type(Spam.__class__.__class__.__class__)  # revealed: Literal[Foo]
+
+def test(x: Spam):
+    reveal_type(x.__class__)  # revealed: type[Spam]
+    reveal_type(x.__class__.__class__)  # revealed: type[Baz]
+    reveal_type(x.__class__.__class__.__class__)  # revealed: type[Bar]
+    reveal_type(x.__class__.__class__.__class__.__class__)  # revealed: type[Foo]
+    reveal_type(x.__class__.__class__.__class__.__class__.__class__)  # revealed: type[type]
+
+    # revealed: type[type]
+    reveal_type(x.__class__.__class__.__class__.__class__.__class__.__class__.__class__.__class__)
+```

crates/red_knot_python_semantic/resources/mdtest/type_of/any.md

@@ -1,4 +1,4 @@
-# type[Any]
+# `type[Any]`
 
 ## Simple
 
@@ -51,3 +51,22 @@ x: type[object] = type
 x: type[object] = A
 x: type[object] = A()  # error: [invalid-assignment]
 ```
+
+## The type of `Any` is `type[Any]`
+
+`Any` represents an unknown set of possible runtime values. If `x` is of type `Any`, the type of
+`x.__class__` is also unknown and remains dynamic, *except* that we know it must be a class object
+of some kind. As such, the type of `x.__class__` is `type[Any]` rather than `Any`:
+
+```py
+from typing import Any
+from does_not_exist import SomethingUnknown  # error: [unresolved-import]
+
+reveal_type(SomethingUnknown)  # revealed: Unknown
+
+def test(x: Any, y: SomethingUnknown):
+    reveal_type(x.__class__)  # revealed: type[Any]
+    reveal_type(x.__class__.__class__.__class__.__class__)  # revealed: type[Any]
+    reveal_type(y.__class__)  # revealed: type[Unknown]
+    reveal_type(y.__class__.__class__.__class__.__class__)  # revealed: type[Unknown]
+```

crates/red_knot_python_semantic/resources/mdtest/type_of/typing_dot_Type.md

@@ -9,7 +9,7 @@ from typing import Type
 
 class A: ...
 
-def _(c: Type, d: Type[A], e: Type[A]):
+def _(c: Type, d: Type[A]):
     reveal_type(c)  # revealed: type
     reveal_type(d)  # revealed: type[A]
     c = d  # fine