static AutoCloseable dm_onCtrlC(Runnable r) {
  DynModule m = dm_current_mandatory();
  ret dm_vmBus_onMessage keyDown_raw(voidfunc(int keyCode, int modifiers) {
    if (keyCode == 99 && modifiers == 2) {
      switch to m.q();
      callF(r);
    }
  });
}