1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// 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"
}
for range cs {// ERROR "receive"
}
close(c)
close(cs)
close(cr) // ERROR "receive"
}
|
