`typing` classes instantiation is considered valid by mypy

Bug Report

mypy fails to detect attempts to instantiate typing.List, which triggers runtime error

To Reproduce

Considering following example:

from typing import List
if __name__ == "__main__":
    x = List[str]([])
    print(x)

Mypy reports this code as valid, although it is guaranteed to fail at runtime:

(py_39) % python3 -mmypy mypy-instance.py
Success: no issues found in 1 source file
(py_39) % python3 mypy-instance.py 
Traceback (most recent call last):
  File "/Users/nshulga/test/mypy-instance.py", line 3, in <module>
    x = List[str]([])
  File "/Users/nshulga/miniconda3/envs/py_39/lib/python3.9/typing.py", line 668, in __call__
    raise TypeError(f"Type {self._name} cannot be instantiated; "
TypeError: Type List cannot be instantiated; use list() instead

Expected Behavior

Mypy shoudl report abovementioned construct as abstract class/non-instantiatiable type

Your Environment

• Mypy version used: 0.910
• Python version used: 3.9.4
• Operating system and version: MacOs 12.0.1

Beginne mit dem Reproducer in mypy-instance.py und führe ihn mit mypy 0.910 aus. Vergleiche anschließend sein Ergebnis mit dem Python-Laufzeitfehler von Liststr. Verfolge, wie mypy die Instanziierung von typing.List behandelt, und sorge dafür, dass das fertige Verhalten dieses Konstrukt als nicht instanziierbar meldet, mit einem Regressionstest für das Beispiel.