lambda expression not recognised as FunctionType, reported as Callable[[Any], Any] instead

[neutrinoceros]

Bug Report

Very likely related to #8869 and #9934

To Reproduce

(Write your steps here:)

run mypy against this file

from types import FunctionType

my_lambdas:dict[str, FunctionType] = {}
my_lambdas["example"] = lambda x: x**2

Expected Behavior
no errors or warnings (since is instance(lambda x: x**2, FunctionType) evaluates to True).

Actual Behavior

mypy_bug.py:4: error: Incompatible types in assignment (expression has type "Callable[[Any], Any]", target has type "FunctionType")
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 0.812
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: Python 3.9.1
• Operating system and version: OSX

[JelleZijlstra]

FunctionType should not be used in type annotations at the moment. See #5958 and #3171 for some context.

[neutrinoceros]

fair enough. Thanks