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"
}