Support bare Callable types

[ghost]

from typing import Iterable, TypeVar, Callable, Iterator, Generic

T = TypeVar("T")

def gen(f: Callable, *args) -> Callable[[], Iterator[T]]:
    return lambda: f(*args)

Related question: is it currently possible to type argument f: Callable[..., Iterator[T]]?

[JukkaL]

Hmm, I don't think that PEP 484 says that Callable is a valid type, but mypy shouldn't crash when you try to use it. It should give an error.

Answer to the question: not yet, but it will become possible: #393

[JukkaL]

PEP 484 actually supports using Callable as a type, so mypy should support as well.

[JukkaL]

Callable should be equivalent to Callable[..., Any].