code: def all_function_definitions(function):
      
      return [function] + [f for c in function.contract.inheritance
                           for f in c.functions_and_modifiers_not_inherited
                           if f.full_name == function.full_name]
docs: Obtains a list of representing this function and any base definitions
      :param function: The function to obtain all definitions at and beneath.
      :return: Returns a list composed of the provided function definition and any base definitions.