invalid-noend.png...

			failed = true
		}
	}

	// send should work with ,ok too: sent a value without blocking, so ok == true.
	shouldPanic(func() { c.Nbsend(1) })

	// the value should have been discarded.
	if x := c.Recv(); x != 0 {
		println("test1: recv on closed got non-zero after send on closed:", x, c.Impl())
		failed = true
	}

	// similarly Send.
	shouldPanic(func() { c.Send(2) })
	if x := c.Recv(); x != 0 {

		if n == nil { // default:
			continue
		}

		var i int
		var c, elem ir.Node
		switch n.Op() {
		default:
			base.Fatalf("select %v", n.Op())
		case ir.OSEND:
			n := n.(*ir.SendStmt)
			i = nsends
			nsends++
			c = n.Chan
			elem = n.Value
		case ir.OSELRECV2:
			n := n.(*ir.AssignListStmt)
			nrecvs++
			i = ncas - nrecvs
			recv := n.Rhs[0].(*ir.UnaryExpr)
			c = recv.X

  }

  override fun dnsStart(
    call: Call,
    domainName: String,
  ) {
    logWithTime("dnsStart: $domainName")
  }

  override fun dnsEnd(
    call: Call,
    domainName: String,
    inetAddressList: List<InetAddress>,
  ) {
    logWithTime("dnsEnd: $inetAddressList")
  }

  override fun connectStart(
    call: Call,
    inetSocketAddress: InetSocketAddress,
    proxy: Proxy,
  ) {

    printEvent("callEnd");
  }

  @Override public void dnsStart(Call call, String domainName) {
    printEvent("dnsStart");
  }

  @Override public void dnsEnd(Call call, String domainName, List<InetAddress> inetAddressList) {
    printEvent("dnsEnd");
  }

  ...
}
```

We make a couple calls:

```java
Request request = new Request.Builder()
    .url("https://publicobject.com/helloworld.txt")

  ) {
    logWithTime("dnsStart: $domainName")

    delegate.dnsStart(call, domainName)
  }

  override fun dnsEnd(
    call: Call,
    domainName: String,
    inetAddressList: List<InetAddress>,
  ) {
    logWithTime("dnsEnd: $inetAddressList")

    delegate.dnsEnd(call, domainName, inetAddressList)
  }

  override fun connectStart(
    call: Call,
    inetSocketAddress: InetSocketAddress,

apiVersion: release-notes/v2
kind: feature
area: networking
releaseNotes:
- |

func frecv[T any](<-chan T) {}
func fsend[T any](chan<- T) {}

func _() {
	var both chan int
	var recv <-chan int
	var send chan<-int

	fboth(both)
	fboth(recv /* ERROR "cannot use" */ )
	fboth(send /* ERROR "cannot use" */ )

	frecv(both)
	frecv(recv)
	frecv(send /* ERROR "cannot use" */ )

	fsend(both)
	fsend(recv /* ERROR "cannot use" */)
	fsend(send)
}

  }

  override fun dnsStart(socketHost: String) {
    eventListener.dnsStart(call, socketHost)
  }

  override fun dnsEnd(
    socketHost: String,
    result: List<InetAddress>,
  ) {
    eventListener.dnsEnd(call, socketHost, result)
  }

        scanner.next();
        boolean isEnd = false;
        if (scanner.lookingAt('/')) {
            isEnd = true;
            scanner.next();
        }

        // element name
        scanner.skip(WHITESPACE_WITH_EOL);
        scanner.mark();
        scanner.find(END_ELEMENT_NAME);
        String elementName = scanner.region().toLowerCase();
        if (isEnd) {