reverse_each

static VALUE
enum_reverse_each(int argc, VALUE *argv, VALUE obj)
{
    VALUE ary;
    long i;

    RETURN_ENUMERATOR(obj, argc, argv);

    ary = enum_to_a(argc, argv, obj);

    for (i = RARRAY_LEN(ary); --i >= 0; ) {
        rb_yield(RARRAY_PTR(ary)[i]);
    }

    return obj;
}