Big merge from experimental to bleeding edge.

utils/pub/log.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.
 
 /// Message logging.
 library log;
 
 import 'dart:io';
 import 'io.dart';
 
@@ skipping 79 matching lines @@
 /// If [endMessage] is omitted, then logs "Begin [startMessage]" before the
 /// operation and "End [startMessage]" after it.
 Future ioAsync(String startMessage, Future operation,
                [String endMessage(value)]) {
   if (endMessage == null) {
     io("Begin $startMessage.");
   } else {
     io(startMessage);
   }
 
-  return operation.transform((result) {
+  return operation.then((result) {
     if (endMessage == null) {
       io("End $startMessage.");
     } else {
       io(endMessage(result));
     }
     return result;
   });
 }
 
 /// Logs the spawning of an [executable] process with [arguments] at [IO]
@@ skipping 108 matching lines @@
         stream.writeString('    | ');
       }
     }
 
     stream.writeString(line);
     stream.writeString('\n');
 
     firstLine = false;
   }
 }