Use failedAt in more places

pkg/compiler/lib/src/js_backend/enqueuer.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.
 
 library dart2js.js.enqueue;
 
 import 'dart:collection' show Queue;
 
 import '../common/tasks.dart' show CompilerTask;
 import '../common/work.dart' show WorkItem;
@@ skipping 48 matching lines @@
     _impactVisitor = new EnqueuerImplImpactVisitor(this);
   }
 
   CodegenWorldBuilder get worldBuilder => _worldBuilder;
 
   bool get queueIsEmpty => _queue.isEmpty;
 
   @override
   void checkQueueIsEmpty() {
     if (_queue.isNotEmpty) {
-      throw new SpannableAssertionFailure(
-          _queue.first.element, "$name queue is not empty.");
+      failedAt(_queue.first.element, "$name queue is not empty.");
     }
   }
 
   /// Returns [:true:] if this enqueuer is the resolution enqueuer.
   bool get isResolutionQueue => false;
 
   /// Create a [WorkItem] for [entity] and add it to the work list if it has not
   /// already been processed.
   void _addToWorkList(MemberEntity entity) {
     if (_processedEntities.contains(entity)) return;
 
     WorkItem workItem = _workItemBuilder.createWorkItem(entity);
     if (workItem == null) return;
 
     if (queueIsClosed) {
-      throw new SpannableAssertionFailure(
-          entity, "Codegen work list is closed. Trying to add $entity");
+      failedAt(entity, "Codegen work list is closed. Trying to add $entity");
     }
 
     applyImpact(listener.registerUsedElement(entity));
     _queue.add(workItem);
   }
 
   void applyImpact(WorldImpact worldImpact, {var impactSource}) {
     if (worldImpact.isEmpty) return;
     impactStrategy.visitImpact(
         impactSource, worldImpact, _impactVisitor, impactUse);
   }
 
   void _registerInstantiatedType(InterfaceType type,
       {bool mirrorUsage: false, bool nativeUsage: false}) {
     task.measure(() {
       _worldBuilder.registerTypeInstantiation(type, _applyClassUse,
           byMirrors: mirrorUsage);
       listener.registerInstantiatedType(type, nativeUsage: nativeUsage);
     });
   }
 
   bool checkNoEnqueuedInvokedInstanceMethods(
       ElementEnvironment elementEnvironment) {
     return strategy.checkEnqueuerConsistency(this, elementEnvironment);
   }
 
   void checkClass(ClassEntity cls) {
     _worldBuilder.processClassMembers(cls, (MemberEntity member, useSet) {
       if (useSet.isNotEmpty) {
-        throw new SpannableAssertionFailure(member,
+        failedAt(member,
             'Unenqueued use of $member: ${useSet.iterable(MemberUse.values)}');
       }
     });
   }
 
   /// Callback for applying the use of a [cls].
   void _applyClassUse(ClassEntity cls, EnumSet<ClassUse> useSet) {
     if (useSet.contains(ClassUse.INSTANTIATED)) {
       _recentClasses.add(cls);
       _worldBuilder.processClassMembers(cls, _applyMemberUse);
@@ skipping 128 matching lines @@
   String toString() => 'Enqueuer($name)';
 
   ImpactUseCase get impactUse => IMPACT_USE;
 
   @override
   Iterable<MemberEntity> get processedEntities => _processedEntities;
 
   @override
   Iterable<ClassEntity> get processedClasses => _worldBuilder.processedClasses;
 }