Function undo

src/_pytest/assertion/__init__.py:136–139

()

    config.stash[assertstate_key].trace(class="st">"installed rewrite import hook")

    def undo() -> None:
        hook = config.stash[assertstate_key].hook
        if hook is not None and hook in sys.meta_path:
            sys.meta_path.remove(hook)

    config.add_cleanup(undo)
    return hook