FunctionTypeComment:a.functionTypeComment
  PyFunctionTypeAnnotation
    PyParameterTypeList
      PsiElement(Py:LPAR)('(')
      PyReferenceExpression: int
        PsiElement(Py:IDENTIFIER)('int')
      PsiElement(Py:COMMA)(',')
      PsiWhiteSpace(' ')
      PyReferenceExpression: str
        PsiElement(Py:IDENTIFIER)('str')
      PsiElement(Py:RPAR)(')')
    PsiWhiteSpace(' ')
    PsiElement(Py:RARROW)('->')
    PsiWhiteSpace(' ')
    PyNoneLiteralExpression
      PsiElement(Py:NONE_KEYWORD)('None')