[ty] Do not consider a type T to satisfy a method member on a protocol unless the method is available on the meta-type of T (#19187)

crates/ty_python_semantic/resources/mdtest/loops/for.md

@@ -754,3 +754,42 @@ def f(never: Never):
     for x in never:
         reveal_type(x)  # revealed: Unknown
 ```
+
+## A class literal is iterable if it inherits from `Any`
+
+A class literal can be iterated over if it has `Any` or `Unknown` in its MRO, since the
+`Any`/`Unknown` element in the MRO could materialize to a class with a custom metaclass that defines
+`__iter__` for all instances of the metaclass:
+
+```py
+from unresolved_module import SomethingUnknown  # error: [unresolved-import]
+from typing import Any, Iterable
+from ty_extensions import static_assert, is_assignable_to, TypeOf, Unknown
+
+class Foo(SomethingUnknown): ...
+
+reveal_type(Foo.__mro__)  # revealed: tuple[<class 'Foo'>, Unknown, <class 'object'>]
+
+# TODO: these should pass
+static_assert(is_assignable_to(TypeOf[Foo], Iterable[Unknown]))  # error: [static-assert-error]
+static_assert(is_assignable_to(type[Foo], Iterable[Unknown]))  # error: [static-assert-error]
+
+# TODO: should not error
+# error: [not-iterable]
+for x in Foo:
+    reveal_type(x)  # revealed: Unknown
+
+class Bar(Any): ...
+
+reveal_type(Bar.__mro__)  # revealed: tuple[<class 'Bar'>, Any, <class 'object'>]
+
+# TODO: these should pass
+static_assert(is_assignable_to(TypeOf[Bar], Iterable[Any]))  # error: [static-assert-error]
+static_assert(is_assignable_to(type[Bar], Iterable[Any]))  # error: [static-assert-error]
+
+# TODO: should not error
+# error: [not-iterable]
+for x in Bar:
+    # TODO: should reveal `Any`
+    reveal_type(x)  # revealed: Unknown
+```