Generate tear-off closures dynamically.

dart/sdk/lib/_internal/compiler/implementation/js_backend/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.
 
 part of js_backend;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 857 matching lines @@
   String isolateBailoutAccess(Element element) {
     String newName = getMappedGlobalName('${getNameX(element)}\$bailout');
     return '${globalObjectFor(element)}.$newName';
   }
 
   String isolateLazyInitializerAccess(Element element) {
     return "${globalObjectFor(element)}.${getLazyInitializerName(element)}";
   }
 
   String isolateStaticClosureAccess(Element element) {
-    return "${globalObjectFor(element)}.${getStaticClosureName(element)}";
+    return "${globalObjectFor(element)}.${getStaticClosureName(element)}()";
   }
 
   String globalObjectForConstant(Constant constant) => 'C';
 
   String operatorIsPrefix() => r'$is';
 
   String operatorAsPrefix() => r'$as';
 
   String operatorSignature() => r'$signature';
 
@@ skipping 490 matching lines @@
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
         visit(link.head);
         first = true;
       }
     }
   }
 }