mw42

  ch := make(chan int, 1)
	
  var send chan<- int = ch
  var recv <-chan int = ch

  send <- 1 // ok
  <- recv   // ok

  recv <- 1 // invalid operation: recv <- 1 (send to receive-only type <-chan int)
  <- send   // invalid operation: <-send (receive from send-only type chan<- int)

  execlp("mv", "mv", src, dest, NULL);