Filter out core and auxilary libs.

lib/compiler/implementation/dart_backend/backend.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.
 
 class BailoutException {
   final String reason;
 
   const BailoutException(this.reason);
 }
 
@@ skipping 42 matching lines @@
 
     // TODO(antonm): Eventually bailouts will be proper errors.
     void bailout(String reason) {
       throw new BailoutException(reason);
     }
 
     /**
      * Tells whether we should output given element. Corelib classes like
      * Object should not be in the resulting code.
      */
-    bool shouldOutput(Element element) {
-      return element.kind !== ElementKind.VOID
-          && element.getLibrary() !== compiler.coreLibrary;
-    }
+    final LIBS_TO_IGNORE = [
+      compiler.coreImplLibrary,
+      compiler.jsHelperLibrary,
+      compiler.interceptorsLibrary,
+      compiler.coreLibrary,
+    ];
+    bool shouldOutput(Element element) =>
+      element.kind !== ElementKind.VOID &&
+      LIBS_TO_IGNORE.indexOf(element.getLibrary()) == -1;
 
     try {
       Emitter emitter = new Emitter(compiler);
       resolvedElements.forEach((element, treeElements) {
         if (!shouldOutput(element)) return;
         if (element.isMember()) {
           var enclosingClass = element.enclosingElement;
           assert(enclosingClass.isClass());
           assert(enclosingClass.isTopLevel());
           addMemberToClass(element, enclosingClass);
@@ skipping 13 matching lines @@
       compiler.assembledCode = '''
 main() {
   final bailout_reason = "${e.reason}";
 }
 ''';
     }
   }
 
   log(String message) => compiler.log('[DartBackend] $message');
 }