JCVariableDecl formalParameter() {
        JCModifiers mods = optFinal(Flags.PARAMETER);
        JCExpression type = type();
        if (S.token() == ELLIPSIS) {
            checkVarargs();
            mods.flags |= Flags.VARARGS;
            type = to(F.at(S.pos()).TypeArray(type));
            S.nextToken();
        }
        return variableDeclaratorId(mods, type);
    }