Get most pub IO tests passing on Windows.

utils/pub/io.dart

Index: utils/pub/io.dart
diff --git a/utils/pub/io.dart b/utils/pub/io.dart
index c81da000b73e479d9366db42cbd8b9770f14138c..e466b7a169f521cbad3b41b8d41bb6b18a117162 100644
--- a/utils/pub/io.dart
+++ b/utils/pub/io.dart
@@ -179,6 +179,8 @@ Future<Directory> deleteDir(dir) {
 /// `false`).
 ///
 /// If [dir] is a string, the returned paths are guaranteed to begin with it.
+///
+/// Note that on Windows, only directories may be symlinked to.

[nweiz, 2013/02/05 03:26:14]

Is this note supposed to be on createSymlink?

[Bob Nystrom, 2013/02/05 04:21:53]

Done.

 Future<List<String>> listDir(dir,
     {bool recursive: false, bool includeHiddenFiles: false}) {
   Future<List<String>> doList(Directory dir, Set<String> listedDirectories) {
@@ -190,6 +192,7 @@ Future<List<String>> listDir(dir,
     if (listedDirectories.contains(resolvedPath)) {
       return new Future.immediate([]);
     }
+
     listedDirectories = new Set<String>.from(listedDirectories);
     listedDirectories.add(resolvedPath);
 
@@ -220,7 +223,6 @@ Future<List<String>> listDir(dir,
       if (!includeHiddenFiles && basename(file).startsWith('.')) return;
       file = join(dir, basename(file));
       contents.add(file);
-
       // TODO(nweiz): don't manually recurse once issue 7358 is fixed. Note that
       // once we remove the manual recursion, we'll need to explicitly filter
       // out files in hidden directories.
@@ -228,6 +230,7 @@ Future<List<String>> listDir(dir,
         children.add(doList(new Directory(file), listedDirectories));
       }
     };
+
     lister.onFile = (file) {
       if (!includeHiddenFiles && basename(file).startsWith('.')) return;
       contents.add(join(dir, basename(file)));