JExpression newRight = (JExpression)right.accept(this); if (newRight.isConstant()) self.setRight(newRight);
    public Object visitCompoundAssignmentExpression(JCompoundAssignmentExpression self,						    int oper,						    JExpression left,						    JExpression right) {	if(left instanceof JLocalVariableExpression)	    constants.remove(((JLocalVariableExpression)left).getVariable());	else	    System.err.println("WARNING: Compound Assignment of nonvariable: "+left);	return self;    }