used-before-def and TYPE_CHECKING

[JelleZijlstra]

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    Alias = MyClass
else:
    Alias = object
    
class MyClass:
    pass

On mypy 1.3.0 (https://mypy-play.net/?mypy=latest&python=3.10&gist=5f2c9b8d93c4b97a57d385c3511f23b3) produces:

main.py:4: error: Name "MyClass" is used before definition  [used-before-def]

Perhaps the check should be fully suppressed within if TYPE_CHECKING blocks.

[JelleZijlstra]

This is a duplicate of #14539.