Cannot instantiate type "Type[None]"

[wyattscarpenter]

Bug Report

Mypy claims Cannot instantiate type "Type[None]" when you try to do so. However, you actually can do this in python, and perhaps have been able to do this ever since python 3...

This affects both types.NoneType and type(None). Also, function signatures that get at those.

To Reproduce

https://mypy-play.net/?mypy=master&python=3.12&gist=26b0ab20fc6d45de0edff4f8a374b0a7

from types import NoneType
type(None)()
NoneType()
def f(n: type[None]):
    n()
def g(n: type[NoneType]):
    n()
f(NoneType)
g(NoneType)

Actual Behavior
main.py:2: error: Cannot instantiate type "type[None]" [misc]
main.py:3: error: Cannot instantiate type "type[None]" [misc]
main.py:5: error: Cannot instantiate type "type[None]" [misc]
main.py:6: error: NoneType should not be used as a type, please use None instead [valid-type]
main.py:7: error: Cannot instantiate type "type[None]" [misc]
Found 5 errors in 1 file (checked 1 source file)

Expected Behavior
Running this python file doesn't result in any runtime problems, so I would expect no errors. (Except perhaps main.py:6: error: NoneType should not be used as a type, please use None instead [valid-type], which seems like more of a style suggstion, and so might still be valid.)

Possibly related, perhaps even fixable by this issue: #19308

[hauntsaninja]

Look at analyze_type_type_callee

[Priyans00]

Hi! If this issue is still available, I’d love to work on it. Could you please assign it to me?

[wyattscarpenter]

@Priyans00 go ahead! There is no process for assigning issues in mypy, It's just whoever happens to do to it