Tree[] args = new Tree[] { gen.mkRef(pos, pre, sym) };
Tree[] args = new Tree[] { gen.mkQualifier(pos, tp) };
        private Tree singleType(int pos, Type pre, Symbol sym) {            Tree constr =                gen.mkPrimaryConstructorGlobalRef(pos, defs.SINGLETYPE_CLASS);            Tree[] args = new Tree[] { gen.mkRef(pos, pre, sym) };            return gen.New(pos, gen.mkApply_V(constr, args));        }