go issue6847 源码
golang issue6847 代码
文件路径：/test/fixedbugs/issue6847.go
// 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
}
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