array.c:187
VALUE
rb_assoc_new(car, cdr)
    VALUE car, cdr;
{
    VALUE ary;

    ary = rb_ary_new2(2);
    RARRAY(ary)->ptr[0] = car;
    RARRAY(ary)->ptr[1] = cdr;
    RARRAY(ary)->len = 2;

    return ary;
}
