go Serve(ln, handler)
	<-conn.closec
	<-wrotec
	if g, w := buf.String(), "[hijack-to-bufw][hijack-to-conn]"; g != w {
		t.Errorf("wrote %q; want %q", g, w)
	}
}

func TestDoubleHijack(t *testing.T) {
	req := reqBytes("GET / HTTP/1.1\nHost: golang.org")
	var buf bytes.Buffer
	conn := &rwTestConn{
		Reader: bytes.NewReader(req),
		Writer: &buf,
		closec: make(chan bool, 1),
	}