// errorcheck // Copyright 2011 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 2089 - internal compiler error package main import ( "io" "os" ) func echo(fd io.ReadWriterCloser) { // ERROR "undefined.*io.ReadWriterCloser" var buf [1024]byte for { n, err := fd.Read(buf) if err != nil { break } fd.Write(buf[0:n]) } } func main() { fd, _ := os.Open("a.txt") echo(fd) }