go perm 源码
golang perm 代码
文件路径：/test/chan/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|expected channel"
n <- 2 // ERROR "send to non-chan|must be channel"
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|must be channel|non-channel"
}
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