From e3162d43ab3160e8839973ae30e9551a8a53d94e Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Tue, 8 Sep 2009 23:16:19 -0700
Subject: write-only variable _

R=ken
OCL=34465
CL=34470
---
 test/blank.go | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 test/blank.go

(limited to 'test/blank.go')

diff --git a/test/blank.go b/test/blank.go
new file mode 100644
index 000000000..4919841a4
--- /dev/null
+++ b/test/blank.go
@@ -0,0 +1,90 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 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.
+
+package main
+
+var call string
+
+type T struct {
+	_, _, _ int;
+}
+
+const (
+	c0 = iota;
+	_;
+	_;
+	_;
+	c4;
+)
+
+var ints = []string {
+	"1",
+	"2",
+	"3"
+}
+
+func f() (int, int) {
+	call += "f";
+	return 1,2
+}
+
+func g() (float, float) {
+	call += "g";
+	return 3,4
+}
+
+func h(_ int, _ float) {
+}
+
+func i() int {
+	call += "i";
+	return 23;
+}
+
+func main()
+{
+	_, _ = f();
+	a, _ := f();
+	if a != 1 {panic(a)}
+	b, _ := g();
+	if b != 3 {panic(b)}
+	_, a = f();
+	if a != 2 {panic(a)}
+	_, b = g();
+	if b != 4 {panic(b)}
+	_ = i();
+	if call != "ffgfgi" {panic(call)}
+	if c4 != 4 {panic(c4)}
+
+	out := "";
+	for _, s := range ints {
+		out += s;
+	}
+	if out != "123" {panic(out)}
+
+	sum := 0;
+	for s, _ := range ints {
+		sum += s;
+	}
+	if sum != 3 {panic(sum)}
+
+	h(a,b);
+}
+
+// useless but legal
+var _ int = 1;
+var _ = 2;
+var _, _ = 3, 4;
+const _ = 3;
+const _, _ = 4, 5;
+type _ int;
+func _() {
+	panic("oops")
+}
+
+func ff() {
+	var _ int = 1;
+}
-- 
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