def get_base_rev_args(rev):
        # type: (str) -> List[str]
        """
        Return the base revision arguments for a vcs command.

        Args:
          rev: the name of a revision to install.  Cannot be None.
        """
        raise NotImplementedError

        Return the base revision arguments for a vcs command.

        Args:
          rev: the name of a revision to install.  Cannot be None.
        
product/gradle-plugin/src/main/python/pip/_internal/vcs/versioncontrol.py