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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
// compile
// Copyright 2014 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.
// Issue 6847: select clauses involving implicit conversion
// of channels trigger a spurious typechecking error during walk.
package p
type I1 interface {
String()
}
type I2 interface {
String()
}
func F() {
var (
cr <-chan int
cs chan<- int
c chan int
ccr chan (<-chan int)
ccs chan chan<- int
cc chan chan int
ok bool
)
// Send cases.
select {
case ccr <- cr:
case ccr <- c:
}
select {
case ccs <- cs:
case ccs <- c:
}
select {
case ccr <- c:
default:
}
// Receive cases.
select {
case cr = <-cc:
case cs = <-cc:
case c = <-cc:
}
select {
case cr = <-cc:
default:
}
select {
case cr, ok = <-cc:
case cs, ok = <-cc:
case c = <-cc:
}
// Interfaces.
var (
c1 chan I1
c2 chan I2
x1 I1
x2 I2
)
select {
case c1 <- x1:
case c1 <- x2:
case c2 <- x1:
case c2 <- x2:
}
select {
case x1 = <-c1:
case x1 = <-c2:
case x2 = <-c1:
case x2 = <-c2:
}
select {
case x1, ok = <-c1:
case x1, ok = <-c2:
case x2, ok = <-c1:
case x2, ok = <-c2:
}
_ = ok
}
|
