b = bytes.TrimSuffix(b, []byte("gopher"))
	b = append(b, bytes.TrimSuffix([]byte("world!"), []byte("x!"))...)
	os.Stdout.Write(b)
	// Output: Hello, world!
}

func ExampleTrimRight() {
	fmt.Print(string(bytes.TrimRight([]byte("453gopher8257"), "0123456789")))
	// Output:
	// 453gopher
}

func ExampleTrimRightFunc() {
	fmt.Println(string(bytes.TrimRightFunc([]byte("go-gopher"), unicode.IsLetter)))

	// nextToken gets the next token delimited by a newline. This assumes that
	// at least one newline exists in the buffer.
	nextToken := func() string {
		cntNewline--
		tok, _ := buf.ReadString('\n')
		return strings.TrimRight(tok, "\n")
	}

	// Parse for the number of entries.
	// Use integer overflow resistant math to check this.
	if err := feedTokens(1); err != nil {
		return nil, err
	}

		}
		s = s[n:]
	}
	if len(s) == 0 {
		// This is what we've historically done.
		return nil
	}
	return s
}

// TrimRight returns a subslice of s by slicing off all trailing
// UTF-8-encoded code points that are contained in cutset.
func TrimRight(s []byte, cutset string) []byte {
	if len(s) == 0 || cutset == "" {
		return s
	}
	if len(cutset) == 1 && cutset[0] < utf8.RuneSelf {

	tw.blk.reset()

	// Best effort for the filename.
	name = toASCII(name)
	if len(name) > nameSize {
		name = name[:nameSize]
	}
	name = strings.TrimRight(name, "/")

	var f formatter
	v7 := tw.blk.toV7()
	v7.typeFlag()[0] = flag
	f.formatString(v7.name(), name)
	f.formatOctal(v7.mode(), 0)
	f.formatOctal(v7.uid(), 0)
	f.formatOctal(v7.gid(), 0)