code review 5416060: io: new FileInfo, FileMode types + update tree

src/cmd/godoc/filesystem.go

 // 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.
 
 // This file defines types for abstract file system access and
 // provides an implementation accessing the file system of the
 // underlying OS.
 
 package main
 
@@ skipping 33 matching lines @@
 
 func (osFS) Open(path string) (io.ReadCloser, error) {
         f, err := os.Open(path)
         if err != nil {
                 return nil, err
         }
         fi, err := f.Stat()
         if err != nil {
                 return nil, err
         }
-        if fi.Mode().IsDir() {
+        if fi.IsDir() {
                 return nil, fmt.Errorf("Open: %s is a directory", path)
         }
         return f, nil
 }
 
 func (osFS) Lstat(path string) (os.FileInfo, error) {
         return os.Lstat(path)
 }
 
 func (osFS) Stat(path string) (os.FileInfo, error) {
         return os.Stat(path)
 }
 
 func (osFS) ReadDir(path string) ([]os.FileInfo, error) {
         return ioutil.ReadDir(path) // is sorted
 }