bug264: test case for issue 692

R=r
CC=golang-dev
https://golang.org/cl/715042

test/bugs/bug264.go

+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// 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 http://code.google.com/p/go/issues/detail?id=692
+
+package main
+
+import "fmt"
+
+var fooCount = 0
+var barCount = 0
+var balCount = 0
+
+func foo() (int, int) {
+	fooCount++
+	fmt.Println("foo")
+	return 0, 0
+}
+
+func bar() (int, int) {
+	barCount++
+	fmt.Println("bar")
+	return 0, 0
+}
+
+func bal() (int, int) {
+	balCount++
+	fmt.Println("bal")
+	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("BUG: fooCount != 1")
+	}
+	if barCount != 1 {
+		panic("BUG: barCount != 1")
+	}
+	if balCount != 1 {
+		panic("BUG: balCount != 1")
+	}
+}

test/golden.out

@@ -182,3 +182,12 @@ panic PC=xxx
 =========== bugs/bug260.go
 FAIL
 BUG: bug260 failed
+
+=========== bugs/bug264.go
+foo
+bar
+bar
+bal
+bal
+BUG: barCount != 1
+panic PC=xxx