|  | // run | 
|  |  | 
|  | // Copyright 2010 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. | 
|  |  | 
|  | // Test case for https://golang.org/issue/692 | 
|  |  | 
|  | package main | 
|  |  | 
|  | var fooCount = 0 | 
|  | var barCount = 0 | 
|  | var balCount = 0 | 
|  |  | 
|  | func foo() (int, int) { | 
|  | fooCount++ | 
|  | return 0, 0 | 
|  | } | 
|  |  | 
|  | func bar() (int, int) { | 
|  | barCount++ | 
|  | return 0, 0 | 
|  | } | 
|  |  | 
|  | func bal() (int, int) { | 
|  | balCount++ | 
|  | return 0, 0 | 
|  | } | 
|  |  | 
|  | var a, b = foo() // foo is called once | 
|  | var c, _ = bar() // bar is called twice | 
|  | var _, _ = bal() // bal is called twice | 
|  |  | 
|  | func main() { | 
|  | if fooCount != 1 { | 
|  | panic("fooCount != 1") | 
|  | } | 
|  | if barCount != 1 { | 
|  | panic("barCount != 1") | 
|  | } | 
|  | if balCount != 1 { | 
|  | panic("balCount != 1") | 
|  | } | 
|  | } |