Fix for Issue 7224

sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index 4d25e3a6beee49848c4bc94adbf2546da46d74ba..fdc41f1279bdd9062388948f8f23a21f33b3687f 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -219,8 +219,11 @@ function(collectedClasses) {
       var desc = collectedClasses[cls];
 '''/* Get the superclass and the fields in the format Super;field1,field2 from

[ngeoffray, 2012/12/09 10:41:50]

Update the comment?

       the null-string property on the descriptor. */'''
-      var s = desc[''].split(';'), supr = s[0];
-      var fields = s[1] == '' ? [] : s[1].split(',');
+      var fields = desc[''], supr = desc['super'];

[ngeoffray, 2012/12/09 10:41:50]

why not put "supr = desc['super']" in an else branch?

+      if (typeof fields=='string') {

[ngeoffray, 2012/12/09 10:41:50]

spaces between '=='

+        var s = fields.split(';'); supr = s[0];
+        fields = s[1] == '' ? [] : s[1].split(',');
+      }
       $isolatePropertiesName[cls] = $defineClassName(cls, fields, desc);
       if (supr) $pendingClassesName[cls] = supr;
     }
@@ -833,6 +836,10 @@ $lazyInitializerLogic
     /* Do nothing. */
   }
 
+  void emitSuper(String superName, CodeBuffer buffer) {
+    /* Do nothing. */
+  }
+
   void emitClassFields(ClassElement classElement,
                        CodeBuffer buffer,
                        bool emitEndingComma,
@@ -964,6 +971,7 @@ $lazyInitializerLogic
 
     buffer.add('$classesCollector.$className = {');
     emitClassConstructor(classElement, buffer);
+    emitSuper(superName, buffer);
     emitClassFields(classElement, buffer, false,
                     superClass: superName, isNative: false);
     // TODO(floitsch): the emitInstanceMember should simply always emit a ',\n'.