You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
1.3 KiB
71 lines
1.3 KiB
// 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"
|
|
}
|