1// errorcheck
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// Issue 4283: nil == nil can't be done as the type is unknown.
8
9package p
10
11func F1() bool {
12	return nil == nil	// ERROR "invalid"
13}
14
15func F2() bool {
16	return nil != nil	// ERROR "invalid"
17}
18