1from __future__ import annotations as _annotations 
    2 
    3from dataclasses import dataclass 
    4from typing import Union 
    5 
    6 
    7@dataclass 
    8class PydanticRecursiveRef: 
    9    type_ref: str 
    10 
    11    __name__ = 'PydanticRecursiveRef' 
    12    __hash__ = object.__hash__ 
    13 
    14    def __call__(self) -> None: 
    15        """Defining __call__ is necessary for the `typing` module to let you use an instance of 
    16        this class as the result of resolving a standard ForwardRef. 
    17        """ 
    18 
    19    def __or__(self, other): 
    20        return Union[self, other]  # type: ignore 
    21 
    22    def __ror__(self, other): 
    23        return Union[other, self]  # type: ignore