Bug Report
The @staticmethod decorator only appears to work with MyPy when used as a decorator.

For example, the following code works:

class MyClass:
    @staticmethod
    def my_method():
        ...

However, the following code does not work:

from typing import Callable


def make_staticmethod(func: Callable, /) -> staticmethod:
    return staticmethod(func)

class MyClass:
    @make_staticmethod
    def my_method():
        ...

The above code produces the following error:

error: Method must have at least one argument

To Reproduce

1. Run MyPy against the non-working example shown above

Expected Behavior
MyPy sees that the decorator returns a staticmethod and proceeds to treat MyClass.my_method as a staticmethod

Actual Behavior
MyPy produces the following error:

error: Method must have at least one argument

The above error implies that MyPy is not treating the method as a staticmethod.

Your Environment

• Mypy version used: 0.971
• Mypy command-line flags: N/A
• Mypy configuration options from mypy.ini (and other config files): N/A
• Python version used: 3.8.10
• Operating system and version: Linux Mint 20.3 x86_64