Make Map.keys/values Iterables.

utils/pub/yaml/model.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.
 
 part of yaml;
 
 // This file contains the node classes for the internal representations of YAML
 // documents. These nodes are used for both the serialization tree and the
 // representation graph.
 
@@ skipping 204 matching lines @@
     if (!(super == other) || other is! _MappingNode) return false;
     if (content.length != other.content.length) return false;
     for (var key in content.keys) {
       if (!other.content.containsKey(key)) return false;
       if (content[key] != other.content[key]) return false;
     }
     return true;
   }
 
   String toString() {
-    var strContent = content.keys.
-        mappedBy((k) => '${k}: ${content[k]}')
+    var strContent = content.keys
+        .mappedBy((k) => '${k}: ${content[k]}')
         .join(', ');
     return '$tag {$strContent}';
   }
 
   int get hashCode => super.hashCode ^ _hashCode(content);
 
   visit(_Visitor v) => v.visitMapping(this);
 }