pkg bytes, func FieldsFuncSeq([]uint8, func(int32) bool) iter.Seq[[]uint8] #61901
pkg bytes, func FieldsSeq([]uint8) iter.Seq[[]uint8] #61901
pkg bytes, func Lines([]uint8) iter.Seq[[]uint8] #61901
pkg bytes, func SplitAfterSeq([]uint8, []uint8) iter.Seq[[]uint8] #61901
pkg bytes, func SplitSeq([]uint8, []uint8) iter.Seq[[]uint8] #61901
pkg strings, func FieldsFuncSeq(string, func(int32) bool) iter.Seq[string] #61901

  over substrings of s split after each instance of sep.
- [FieldsSeq] returns an iterator over
  substrings of s split around runs of whitespace characters,
  as defined by unicode.IsSpace.
- [FieldsFuncSeq] returns an iterator

  over substrings of s split after each instance of sep.
- [FieldsSeq] returns an iterator over
  substrings of s split around runs of whitespace characters,
  as defined by unicode.IsSpace.
- [FieldsFuncSeq] returns an iterator

		}
		if start >= 0 {
			yield(s[start:len(s):len(s)])
		}
	}
}

// FieldsFuncSeq returns an iterator over substrings of s split around runs of
// Unicode code points satisfying f(c).
// The iterator yields the same strings that would be returned by FieldsFunc(s),
// but without constructing the slice.
func FieldsFuncSeq(s []byte, f func(rune) bool) iter.Seq[[]byte] {
	return func(yield func([]byte) bool) {
		start := -1

		if !slices.Equal(result, tt.a) {
			t.Errorf("FieldsFunc(%q) = %v, want %v", tt.s, a, tt.a)
		}

		result2 := sliceOfString(collect(t, FieldsFuncSeq([]byte(tt.s), pred)))
		if !slices.Equal(result2, tt.a) {
			t.Errorf(`collect(FieldsFuncSeq(%q)) = %v; want %v`, tt.s, result2, tt.a)
		}

		if string(b) != tt.s {
			t.Errorf("slice changed to %s; want %s", b, tt.s)
		}
		if len(tt.a) > 0 {