From 76937156ae7231468d70f889a82a72c97fc70617 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 4 Dec 2012 11:30:46 -0800
Subject: [PATCH] test: add test for invalid nil == nil

R=gri
CC=golang-dev
https://golang.org/cl/6868059
---
 test/fixedbugs/issue4283.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 test/fixedbugs/issue4283.go

diff --git a/test/fixedbugs/issue4283.go b/test/fixedbugs/issue4283.go
new file mode 100644
index 0000000000..128c87231a
--- /dev/null
+++ b/test/fixedbugs/issue4283.go
@@ -0,0 +1,17 @@
+// errorcheck
+
+// 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.
+
+// Issue 4283: nil == nil can't be done as the type is unknown.
+
+package p
+
+func F1() bool {
+	return nil == nil	// ERROR "invalid"
+}
+
+func F2() bool {
+	return nil != nil	// ERROR "invalid"
+}