There should be a builtin alias for `Type[NamedTuple]` so that library 
authors user-supplied `NamedTuple`s can properly type-check their code.

Here's a code sample that causes an issue in my IDE (PyCharm)

********************************
from typing import NamedTuple, Type

def fun(NT: NamedTuple, fill):
    # Complains that NamedTuple is not callable
    nt = NT(*fill)
    return nt


UserNamedTuple = Type[NamedTuple]


def fun(NT: UserNamedTuple, fill):
    # No complaints
    nt = NT(*fill)
    return nt

********************************

This could just be an issue with PyCharm (I don't use mypy), but the 
correct to annotate this is with a Type[NamedTuple], so I hope mypy 
et. al. wouldn't this as a special case...