dexterkennedy

fix misleading error message: MyPy should not suggest a syntactic error when function calls are included in type annotations

1

#16506 This Pull request makes it obvious that function calls in type annotations are not allowed and gets rid of the previous misleading error that the function called should be...

Helpful note when union may not have been narrowed

3

Fixes #17036 The added note makes it easier for new mypy users to understand where the errors are coming from and suggests a potentially simple fix.