1// errorcheck
2
3// Copyright 2011 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 2089 - internal compiler error
8
9package main
10
11import (
12	"io"
13	"os"
14)
15
16func echo(fd io.ReadWriterCloser) { // ERROR "undefined.*io.ReadWriterCloser"
17	var buf [1024]byte
18	for {
19		n, err := fd.Read(buf)
20		if err != nil {
21			break
22		}
23		fd.Write(buf[0:n])
24	}
25}
26
27func main() {
28	fd, _ := os.Open("a.txt")
29	echo(fd)
30}
31