Confusing error message for dict literal

[JukkaL]

I type checked this code:

from typing import Undefined, Dict
x = Undefined(Dict[int, str])
x = {'x': 1}

I got this error message:

x.py, line 3: List item 1 has incompatible type "Tuple[str, int]"

This is confusing since I'm not creating a list and I'm not using tuples.

[gvanrossum]

This issue still exists; the example is now:

from typing import Dict
x = None  # type: Dict[int, str]
x = {'x': 1}