type io.ReadWriteCloser

9 uses

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

	net/http
		transport.go#L2376: func newReadWriteCloserBody(br *bufio.Reader, rwc io.ReadWriteCloser) io.ReadWriteCloser {
		transport.go#L2392: 	io.ReadWriteCloser

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

	nhooyr.io/websocket
		conn.go#L49: 	rwc            io.ReadWriteCloser
		conn.go#L86: 	rwc            io.ReadWriteCloser
		dial.go#L155: 	rwc, ok := respBody.(io.ReadWriteCloser)