Continuation c = catchStack[i];
if (c.tag == tag) return c;
}
// if this is a fiber, search prev for tag
ThreadFiber fiber = getFiber();
ThreadFiber prev;
if (fiber != null && (prev = fiber.getData().getPrev()) != null) {
return prev.getThread().getContext().getActiveCatch(tag);
}
return null;
}