closure calls (just the invocation part).

frog/leg/namer.dart

 // Copyright (c) 2011, 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.
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer {
   static Set<String> _jsReserved = null;
   Set<String> get jsReserved() {
     if (_jsReserved === null) {
       _jsReserved = new Set<String>();
       _jsReserved.addAll(JsNames.javaScriptKeywords);
       _jsReserved.addAll(JsNames.reservedPropertySymbols);
     }
     return _jsReserved;
   }
 
   Map<Element, String> globals;
   Map<String, int> usedGlobals;
 
   Namer()
       : globals = new Map<Element, String>(),
         usedGlobals = new Map<String, int>();
 
   String get currentIsolate() => "\$";
   String get isolate() => "Isolate";
 
 
+  String closureInvocationName() {
+    // TODO(floitsch): mangle, while not conflicting with instance names.
+    return '\$call';
+  }
+
   String instanceName(SourceString instanceName) {
     String candidate = '$instanceName';
     // TODO(floitsch): mangle, while preserving uniqueness.
     return candidate;
   }
 
   /**
    * The constructor-body name is computed from the corresponding
    * constructor element because, in the case of a super-initialization, the
    * body element is not accessible.
@@ skipping 77 matching lines @@
     if (jsId === null) jsId = define(element);
     return "$currentIsolate.$jsId";
   }
 
   String isolatePropertyAccess(Element element) {
     String jsId = globals[element];
     if (jsId === null) jsId = define(element);
     return "$isolate.prototype.$jsId";
   }
 }