Add generic argument to Codec.fuse.

sdk/lib/convert/codec.dart

 // Copyright (c) 2013, 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.
 
 part of dart.convert;
 
 /**
  * A [Codec] encodes and (if supported) decodes data.
  *
  * Codecs can be fused. For example fusing [JSON] and [UTF8] produces
@@ skipping 44 matching lines @@
    *     var decoded = JSON_TO_BYTES.decode(bytes);
    *     assert(decoded is List && decoded[0] == "json-object");
    *
    *     var inverted = JSON.inverted;
    *     var jsonIdentity = JSON.fuse(inverted);
    *     var jsonObject = jsonIdentity.encode(["1", 2]);
    *     assert(jsonObject is List && jsonObject[0] == "1" && jsonObject[1] == 2);
    */
   // TODO(floitsch): use better example with line-splitter once that one is
   // in this library.
-  Codec<S, dynamic> fuse(Codec<T, dynamic> other) {
-    return new _FusedCodec<S, T, dynamic>(this, other);
+  Codec<S, dynamic/*=R*/> fuse/*<R>*/(Codec<T, dynamic/*=R*/> other) {
+    return new _FusedCodec<S, T, dynamic/*=R*/>(this, other);
   }
 
   /**
    * Inverts `this`.
    *
    * The [encoder] and [decoder] of the resulting codec are swapped.
    */
   Codec<T, S> get inverted => new _InvertedCodec<T, S>(this);
 }
 
@@ skipping 16 matching lines @@
 class _InvertedCodec<T, S> extends Codec<T, S> {
   final Codec<S, T> _codec;
 
   _InvertedCodec(Codec<S, T> codec) : _codec = codec;
 
   Converter<T, S> get encoder => _codec.decoder;
   Converter<S, T> get decoder => _codec.encoder;
 
   Codec<S, T> get inverted => _codec;
 }