static <A> AutoCloseable vmBus_onMessage(fS msg, final VF1<A> onMessage) {
  ret tempAdd(vm_busListeners_live(), voidfunc(S _msg, O arg) {
    if (eq(msg, _msg))
      callF(onMessage, arg);
  });
}

ifclass VF2
static <A, B> AutoCloseable vmBus_onMessage(S msg, final VF2<A, B> onMessage) {
  ret vmBus_onMessage(msg, voidfunc(O[] o) {
    callF(onMessage, first(o), second(o));
  });
}
endif

ifclass VF3
static <A, B, C> AutoCloseable vmBus_onMessage(S msg, final VF3<A, B, C> onMessage) {
  ret vmBus_onMessage(msg, voidfunc(O[] o) {
    callF(onMessage, first(o), second(o), third(o));
  });
}
endif

static AutoCloseable vmBus_onMessage(S msg, Runnable onMessage) {
  ret vmBus_onMessage(msg, runnableToVF1(onMessage));
}

Began life as a copy of #1018419