Confusing __class__ for instance of non-generic class that subclasses generic class

The following program prints `__main__.A[int]` even though `A` is not generic. I'd expect it to print something like `<class '__main__.A'>`.

```
from typing import Iterator

class A(Iterator[int]):
    def __next__(self): pass

print(A().__class__)
```

Also, this does not generate an exception, even though `A` is not generic:

```
def f(x: A[int]) -> None: pass
```
