mirror of
https://github.com/golang/go
synced 2024-11-12 10:30:23 -07:00
20e97677fd
Normally, an expression of the form x.f or *y can be reordered with function calls and communications. Select is stricter than normal: each channel expression is evaluated in source order. If you have case <-x.f and case <-foo(), then if the evaluation of x.f causes a panic, foo must not have been called. (This is in contrast to an expression like x.f + foo().) Enforce this stricter ordering. Fixes #8336. LGTM=dvyukov R=golang-codereviews, dvyukov CC=golang-codereviews, r https://golang.org/cl/126570043
30 lines
516 B
Go
30 lines
516 B
Go
// run
|
|
|
|
// 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 8336. Order of evaluation of receive channels in select.
|
|
|
|
package main
|
|
|
|
type X struct {
|
|
c chan int
|
|
}
|
|
|
|
func main() {
|
|
defer func() {
|
|
recover()
|
|
}()
|
|
var x *X
|
|
select {
|
|
case <-x.c: // should fault and panic before foo is called
|
|
case <-foo():
|
|
}
|
|
}
|
|
|
|
func foo() chan int {
|
|
println("BUG: foo must not be called")
|
|
return make(chan int)
|
|
}
|