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from types import TracebackType
from typing import Optional, Union

import torch


class _InsertPoint:
    def __init__(

        self,

        insert_point_graph: torch._C.Graph,

        insert_point: Union[torch._C.Node, torch._C.Block],

    ):
        self.insert_point = insert_point
        self.g = insert_point_graph
        self.guard = None

    def __enter__(self) -> None:
        self.prev_insert_point = self.g.insertPoint()
        self.g.setInsertPoint(self.insert_point)

    def __exit__(

        self,

        exc_type: Optional[type[BaseException]],

        exc_val: Optional[BaseException],

        exc_tb: Optional[TracebackType],

    ) -> None:
        self.g.setInsertPoint(self.prev_insert_point)


def insert_point_guard(

    self: torch._C.Graph, insert_point: Union[torch._C.Node, torch._C.Block]

) -> _InsertPoint:
    return _InsertPoint(self, insert_point)