Big merge from experimental to bleeding edge.

utils/pub/validator/lib.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library lib_validator;
 
 import 'dart:io';
 
 import '../entrypoint.dart';
 import '../io.dart';
@@ skipping 11 matching lines @@
   Future validate() {
     var libDir = join(entrypoint.root.dir, "lib");
 
     return dirExists(libDir).chain((libDirExists) {
       if (!libDirExists) {
         errors.add('You must have a "lib" directory.\n'
             "Without that, users cannot import any code from your package.");
         return new Future.immediate(null);
       }
 
-      return listDir(libDir).transform((files) {
-        files = files.map((file) => relativeTo(file, libDir));
+      return listDir(libDir).then((files) {
+        files = files.mappedBy((file) => relativeTo(file, libDir)).toList();
         if (files.isEmpty) {
           errors.add('You must have a non-empty "lib" directory.\n'
               "Without that, users cannot import any code from your package.");
         } else if (files.length == 1 && files.first == "src") {
           errors.add('The "lib" directory must contain something other than '
               '"src".\n'
               "Otherwise, users cannot import any code from your package.");
         }
       });
     });
   }
 }