svoid dm_action(fS desc, final Runnable r) {
  print(desc);
  runInterruptibly(voidfunc(final Runnable interrupt) {
    temp AutoCloseable action = dm_currentAction(desc,
      r { print("INTERRUPTED"); callF(interrupt) });
    callF(r);
  });
}

svoid dm_action(Runnable r) {
  dm_action(str(r), r);
}