Any is not subscriptable

Bug Report

When treating Any as one would treat Union by subscripting values, i.e. Any[int,str], mypy does not produce an error or failure of any kind.

To Reproduce

1. Create file test.py with the contents:

from typing import Any
test: Any[int,str] = "Test"
print(test)

2. Run mypy test.py, observe no failure
3. Run python test python test.py, observe failure:

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    test: Any[int,str] = "Test"
  File "/home/chad/.pyenv/versions/3.8.5/lib/python3.8/typing.py", line 261, in inner
    return func(*args, **kwds)
  File "/home/chad/.pyenv/versions/3.8.5/lib/python3.8/typing.py", line 370, in __getitem__
    raise TypeError(f"{self} is not subscriptable")
TypeError: typing.Any is not subscriptable

Expected Behavior

Expect mypy to identify erroneous use of Any and raise error

Actual Behavior

No errors

Your Environment

• Mypy version used: 0.902
• Mypy command-line flags: --all
• Mypy configuration options from mypy.ini (and other config files):
• Python version used:

[mypy]
python_version = 3.8
ignore_missing_imports = True

• Operating system and version: Linux chad-a15 5.8.0-55-generic #62~20.04.1-Ubuntu SMP Wed Jun 2 08:55:04 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Start with the provided test.py reproducer and inspect mypy's handling of subscripted types involving Any. Add a regression test that captures the expected diagnostic, then run the relevant test suite to confirm mypy reports the invalid use while preserving valid Any usage.