text: # Expose a limited set of classes and functions so callers outside of
  # the vcs package don't need to import deeper than `pip._internal.vcs`.
  # (The test directory and imports protected by TYPE_CHECKING may
  # still need to import from a vcs sub-package.)
  # Import all vcs modules to register each VCS in the VcsSupport object.
  import pip._internal.vcs.bazaar
  import pip._internal.vcs.git
  import pip._internal.vcs.mercurial
  import pip._internal.vcs.subversion  # noqa: F401
  from pip._internal.vcs.versioncontrol import (  # noqa: F401
      RemoteNotFoundError,
      is_url,
      make_vcs_requirement_url,
      vcs,
  )
  