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Name	Size	Permission
doubleselect.go	1.96 KB	-rw-r--r--
fifo.go	896 B	-rw-r--r--
goroutines.go	743 B	-rw-r--r--
nonblock.go	3.93 KB	-rw-r--r--
perm.go	1.33 KB	-rw-r--r--
powser1.go	12.65 KB	-rw-r--r--
powser2.go	13.29 KB	-rw-r--r--
select.go	913 B	-rw-r--r--
select2.go	1.04 KB	-rw-r--r--
select3.go	4.07 KB	-rw-r--r--
select4.go	513 B	-rw-r--r--
select5.go	9.97 KB	-rw-r--r--
select6.go	783 B	-rw-r--r--
select7.go	932 B	-rw-r--r--
select8.go	826 B	-rw-r--r--
sendstmt.go	672 B	-rw-r--r--
sieve1.go	1.49 KB	-rw-r--r--
sieve2.go	3.88 KB	-rw-r--r--
zerosize.go	349 B	-rw-r--r--

Code Editor : perm.go

// 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"
}

${this.title}

Code Editor : perm.go