throw new Error("Register(s) in use");
	public void reset(AbstractX86Stream os) {		if (allocated.size() != 0) {			// resetting a register pool with items in use			Iterator inUse = allocated.keySet().iterator();			while (inUse.hasNext()) {				os.log("Warning: register in use"+inUse.next().toString());			}		}		initialize();	}