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Source file test/chan/perm.go

Documentation: test/chan

  // errorcheck
  
  // Copyright 2009 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // Test various correct and incorrect permutations of send-only,
  // receive-only, and bidirectional channels.
  // Does not compile.
  
  package main
  
  var (
  	cr <-chan int
  	cs chan<- int
  	c  chan int
  )
  
  func main() {
  	cr = c  // ok
  	cs = c  // ok
  	c = cr  // ERROR "illegal types|incompatible|cannot"
  	c = cs  // ERROR "illegal types|incompatible|cannot"
  	cr = cs // ERROR "illegal types|incompatible|cannot"
  	cs = cr // ERROR "illegal types|incompatible|cannot"
  
  	var n int
  	<-n    // ERROR "receive from non-chan"
  	n <- 2 // ERROR "send to non-chan"
  
  	c <- 0       // ok
  	<-c          // ok
  	x, ok := <-c // ok
  	_, _ = x, ok
  
  	cr <- 0      // ERROR "send"
  	<-cr         // ok
  	x, ok = <-cr // ok
  	_, _ = x, ok
  
  	cs <- 0      // ok
  	<-cs         // ERROR "receive"
  	x, ok = <-cs // ERROR "receive"
  	_, _ = x, ok
  
  	select {
  	case c <- 0: // ok
  	case x := <-c: // ok
  		_ = x
  
  	case cr <- 0: // ERROR "send"
  	case x := <-cr: // ok
  		_ = x
  
  	case cs <- 0: // ok
  	case x := <-cs: // ERROR "receive"
  		_ = x
  	}
  
  	for _ = range cs { // ERROR "receive"
  	}
  
  	for range cs { // ERROR "receive"
  	}
  
  	close(c)
  	close(cs)
  	close(cr) // ERROR "receive"
  	close(n)  // ERROR "invalid operation.*non-chan type"
  }
  

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