type io.WriterTo

5 uses

	io (current package)
		io.go#L195: type WriterTo interface {
		io.go#L404: 	if wt, ok := src.(WriterTo); ok {

	bufio
		bufio.go#L505: 	if r, ok := b.rd.(io.WriterTo); ok {

	net
		net.go#L695: 	_ io.WriterTo = (*Buffers)(nil)

	net/http
		http.go#L123: 	_ io.WriterTo   = NoBody