Invalid type error for deferred function

@ecprice

Mypy complains about the following program because of deferred type checking:

from typing import Union

def f(a: Union[int, str]) -> None:
    x
    a = x
    a + 1   # Error

x = 1 + 1

If x = 1 + 1 is before the function definition there is no error.

This was originally reported by @ecprice: #1748 (comment). There's additional discussion in the linked PR.

This works correctly on master.

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