// errorcheck// Copyright 2009 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.package main
import os "os"type _ os.FileInfo
funcf() (os int) {// In the next line "os" should refer to the result variable, not// to the package.
v := os.Open("",0,0);// ERROR "undefined"return0}