| // 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" |
| |
| 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" |
| } |
| |
| close(c) |
| close(cs) |
| close(cr) // ERROR "receive" |
| } |