Fix PrintToJSONStream for oddball functions

runtime/bin/vmservice/client/lib/src/service/object.dart

 // Copyright (c) 2014, 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 service;
 
 /// A [ServiceObject] is an object known to the VM service and is tied
 /// to an owning [Isolate].
 abstract class ServiceObject extends Observable {
   /// The owner of this [ServiceObject].  This can be an [Isolate], a
@@ skipping 525 matching lines @@
       node.children.add(child);
       node.summedChildCount += child.count;
     }
     return node;
   }
 }
 
 /// A [ServiceObject] which implements [ObservableMap].
 class ServiceMap extends ServiceObject implements ObservableMap {
   final ObservableMap _map = new ObservableMap();
+  static String objectIdRingPrefix = 'objects/';
 
   bool get canCache {
     return (_serviceType == 'Class' ||
             _serviceType == 'Function' ||
-            _serviceType == 'Library');
+            _serviceType == 'Library') &&
+           !_id.startsWith(objectIdRingPrefix);
   }
   bool get immutable => canCache;
 
   ServiceMap._empty(ServiceObjectOwner owner) : super._empty(owner);
 
   String toString() => _map.toString();
 
   void _upgradeValues() {
     assert(owner != null);
     _upgradeCollection(_map, owner);
   }
 
   void _update(ObservableMap map, bool mapIsRef) {
     _loaded = !mapIsRef;
 
     // TODO(turnidge): Currently _map.clear() prevents us from
     // upgrading an already upgraded submap.  Is clearing really the
     // right thing to do here?
     _map.clear();
     _map.addAll(map);
-    
+
     name = _map['user_name'];
     vmName = _map['name'];
     _upgradeValues();
   }
 
   // Forward Map interface calls.
   void addAll(Map other) => _map.addAll(other);
   void clear() => _map.clear();
   bool containsValue(v) => _map.containsValue(v);
   bool containsKey(k) => _map.containsKey(k);
@@ skipping 409 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }