code review 5307066: non-pkg: gofix -r error

test/fixedbugs/bug262.go

 // $G $D/$F.go && $L $F.$A && ./$A.out
 
 // Copyright 2010 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"
         "strconv"
 )
 
 var trace string
 
 func f() string {
         trace += "f"
         return "abc"
 }
 
-func g() *os.Error {
+func g() *error {
         trace += "g"
-        var x os.Error
+        var x error
         return &x
 }
 
 func h() string {
         trace += "h"
         return "123"
 }
 
 func i() *int {
         trace += "i"
         var i int
         return &i
 }
 
-
 func main() {
         m := make(map[string]int)
         m[f()], *g() = strconv.Atoi(h())
         if m["abc"] != 123 || trace != "fgh" {
                 println("BUG", m["abc"], trace)
                 panic("fail")
         }
-        mm := make(map[string]os.Error)
+        mm := make(map[string]error)
         trace = ""
         mm["abc"] = os.EINVAL
         *i(), mm[f()] = strconv.Atoi(h())
         if mm["abc"] != nil || trace != "ifh" {
                 println("BUG1", mm["abc"], trace)
                 panic("fail")
         }
 }