1 // run 2 3 // Copyright 2012 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Order of operations in select. 8 9 package main 10 11 func main() { 12 c := make(chan int, 1) 13 x := 0 14 select { 15 case c <- x: // should see x = 0, not x = 42 (after makec) 16 case <-makec(&x): // should be evaluated only after c and x on previous line 17 } 18 y := <-c 19 if y != 0 { 20 panic(y) 21 } 22 } 23 24 func makec(px *int) chan bool { 25 if false { for {} } 26 *px = 42 27 return make(chan bool, 0) 28 } 29
