Tree array = gen.mkLocalRef(pos, vparams[0]);
Tree array = gen.mkLocalRef(pos, tpArraySym);
                    public Tree treeForVar(Symbol sym) {                        int idx = ((Integer)varMap.get(sym)).intValue();                        Tree array = gen.mkLocalRef(pos, vparams[0]);                        return gen.mkArrayGet(pos, array, idx);                    }