Big merge from experimental to bleeding edge.

samples/markdown/markdown.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.
 
 /// Standalone script for parsing markdown from files and converting to HTML.
 library markdown_app;
 
 import 'dart:io';
 import 'lib.dart';
 
@@ skipping 15 matching lines @@
   if (args.length == 1) {
     print(html);
   } else {
     writeFile(args[1], html);
   }
 }
 
 String readFile(String path) {
   final file = (new File(path)).openSync();
   final length = file.lengthSync();
-  final buffer = new List<int>(length);
+  final buffer = new List<int>.fixedLength(length);
   final bytes = file.readListSync(buffer, 0, length);
   file.closeSync();
   return new String.fromCharCodes(buffer);
 }
 
 void writeFile(String path, String text) {
   final file = new File(path);
   final stream = file.openOutputStream();
   stream.write(text.charCodes);
   stream.close();
 }