req := treq.Request
	trace := treq.trace
	ctx := req.Context()
	if trace != nil && trace.GetConn != nil {
		trace.GetConn(cm.addr())
	}

	// Detach from the request context's cancellation signal.
	// The dial should proceed even if the request is canceled,
	// because a future request may be able to make use of the connection.
	//
	// We retain the request context's values.