FunctionTypeComment:a.functionTypeComment
  PyFunctionTypeAnnotation
    PyParameterTypeList
      PsiElement(Py:LPAR)('(')
      PsiElement(Py:RPAR)(')')
    PsiWhiteSpace(' ')
    PsiElement(Py:RARROW)('->')
    PsiWhiteSpace(' ')
    PyNoneLiteralExpression
      PsiElement(Py:NONE_KEYWORD)('None')