Variable v = (Variable) source;
Variable v = source;
	public void addSource(Variable source) {		sources.add(source);		int type = getType();		if (type == UNKNOWN) {			setType(source.getType());			Variable v = (Variable) source;			varIndex = v.getIndex();		} else if (type != source.getType()) {			throw new AssertionError("phi operand source types don't match");		}	}