}
		if tt.n < 0 {
			b := sliceOfString(Split([]byte(tt.s), []byte(tt.sep)))
			if !slices.Equal(result, b) {
				t.Errorf("Split disagrees withSplitN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
			}
		}
		if len(a) > 0 {
			in, out := a[0], s
			if cap(in) == cap(out) && &in[:1][0] == &out[:1][0] {
				t.Errorf("Join(%#v, %q) didn't copy", a, tt.sep)
			}
		}
	}

// SplitAfterSeq returns an iterator over subslices of s split after each instance of sep.
// The iterator yields the same subslices that would be returned by [SplitAfter](s, sep),
// but without constructing a new slice containing the subslices.
// It returns a single-use iterator.
func SplitAfterSeq(s, sep []byte) iter.Seq[[]byte] {
	return splitSeq(s, sep, len(sep))
}

// FieldsSeq returns an iterator over subslices of s split around runs of

}

// Count counts the number of non-overlapping instances of sep in s.
// If sep is an empty slice, Count returns 1 + the number of UTF-8-encoded code points in s.
func Count(s, sep []byte) int {
	// special case
	if len(sep) == 0 {
		return utf8.RuneCount(s) + 1
	}
	if len(sep) == 1 {
		return bytealg.Count(s, sep[0])
	}
	n := 0
	for {
		i := Index(s, sep)
		if i == -1 {
			return n
		}
		n++

		testName string
		entry    string
		dir      string
		sep      string
		want     bool
	}{
		{
			testName: "basic-file",
			entry:    "src/file",
			dir:      "src/",
			sep:      slashSeparator,
			want:     true,
		},
		{
			testName: "basic-dir",
			entry:    "src/dir/",
			dir:      "src/",
			sep:      slashSeparator,
			want:     true,
		},
		{

	if err != nil {
		return entries, err
	}
	if o.Marker != "" {
		err = r.forwardTo(o.Marker)
		if err != nil {
			return entries, err
		}
	}
	o.debugln("forwarded to ", o.Prefix, "marker:", o.Marker, "sep:", o.Separator)

	// Filter
	if !o.Recursive {
		entries.o = make(metaCacheEntries, 0, o.Limit)
		pastPrefix := false
		err := r.readFn(func(entry metaCacheEntry) bool {

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