Can't create a type alias targeting None #3269
Description
An alias that refers to None doesn't work:
N = type(None)
NN = None
n: N # Invalid type "t.N"
nn: NN # Invalid type "t.NN"{{ message }}
An alias that refers to None doesn't work:
N = type(None)
NN = None
n: N # Invalid type "t.N"
nn: NN # Invalid type "t.NN"