False negatives for N806, N815, N816

[sobolevn]

This code raises 0 violations:

mixedCase: int = 1

def some():
    mixedCase: int = 1

class Test(object):
    mixedCase: int = 1

But, it should raise 3 of them. Let's refactor ast.AnnAssign to be ast.Assign and here they are:

» flake8 ex.py --select=N

ex.py

  1:2      N816  variable 'mixedCase' in global scope should not be mixedCase
  mixedCase = 1
   ^

  4:6      N806  variable 'mixedCase' in function should be lowercase
  mixedCase = 1
   ^

  7:6      N815  variable 'mixedCase' in class scope should not be mixedCase
  mixedCase = 1
   ^

Full list of violations and explanations:
https://wemake-python-stylegui.de/en/0.13.4/pages/usage/violations/

Related: wemake-services/wemake-python-styleguide#1138