1// errorcheck
2
3// Copyright 2009 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
7package main
8
9func main() {
10	// 6g used to compile these as two different
11	// hash codes so it missed the duplication
12	// and worse, compiled the wrong code
13	// for one of them.
14	var x interface{};
15	switch x.(type) {
16	case func(int):
17	case func(f int):	// ERROR "duplicate"
18	}
19}
20