mirror of
https://github.com/golang/go
synced 2024-11-18 14:34:39 -07:00
1b3244e0db
Ordinary variable load was assumed to be not worth saving, but not if one of the function calls later might change its value. Fixes #4313. R=ken2 CC=golang-dev https://golang.org/cl/6997047
29 lines
547 B
Go
29 lines
547 B
Go
// run
|
|
|
|
// Copyright 2012 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.
|
|
|
|
// Order of operations in select.
|
|
|
|
package main
|
|
|
|
func main() {
|
|
c := make(chan int, 1)
|
|
x := 0
|
|
select {
|
|
case c <- x: // should see x = 0, not x = 42 (after makec)
|
|
case <-makec(&x): // should be evaluated only after c and x on previous line
|
|
}
|
|
y := <-c
|
|
if y != 0 {
|
|
panic(y)
|
|
}
|
|
}
|
|
|
|
func makec(px *int) chan bool {
|
|
if false { for {} }
|
|
*px = 42
|
|
return make(chan bool, 0)
|
|
}
|