type io.ReadWriteCloser

6 uses

	io (current package)
		io.go#L149: type ReadWriteCloser interface {

	net/http
		transport.go#L2474: func newReadWriteCloserBody(br *bufio.Reader, rwc io.ReadWriteCloser) io.ReadWriteCloser {
		transport.go#L2490: 	io.ReadWriteCloser

	net/textproto
		textproto.go#L61: 	conn io.ReadWriteCloser
		textproto.go#L65: func NewConn(conn io.ReadWriteCloser) *Conn {