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Use alias names in error messages #2968

Description

@rhettinger

Given:

from typing import Tuple
from math import hypot

Point = Tuple[float, ...]
Centroid = Point

def dist(p: Centroid, q: Point) -> float:
    px, py = p
    qx, qy = q
    return hypot(px - qx, py - qy)

print( dist('xyz', (3.5, 7.2)) )

mypy detect the incorrect first argument:

$ mypy tmp.py
tmp.py:12: error: Argument 1 to "dist" has incompatible type "str"; expected Tuple[float, ...]

However, it would be much nicer is the error reporting could have used the alias name:

tmp.py:12: error: Argument 1 to "dist" has incompatible type "str"; expected "Centroid", which expands to Tuple[float, ...]

I realize it may be easy to do, but it would improve the usability of aliases.

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