code: def parse_function_type_comment(type_comment: str) -> Optional[FunctionType]:
      
      if _ast_py3 is None:
          return None
  
      func_type = _ast_py3.parse(type_comment, "<type_comment>", "func_type")
      return FunctionType(argtypes=func_type.argtypes, returns=func_type.returns)
docs: Given a correct type comment, obtain a FunctionType object