Use failedAt in more places

pkg/compiler/lib/src/world.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.world;
 
 import 'closure.dart' show ClosureClassElement, SynthesizedCallMethodElementX;
 import 'common.dart';
 import 'constants/constant_system.dart';
 import 'common_elements.dart' show CommonElements;
@@ skipping 1211 matching lines @@
     // Use the [:implementation] of [cls] in case the found [element]
     // is in the patch class.
     return cls.implementation
         .lookupByName(selector.memberName, stopAt: stopAtSuperclass);
   }
 
   /// Returns whether a [selector] call on an instance of [cls]
   /// will hit a method at runtime, and not go through [noSuchMethod].
   bool hasConcreteMatch(ClassElement cls, Selector selector,
       {ClassElement stopAtSuperclass}) {
-    assert(invariant(cls, isInstantiated(cls),
-        message: '$cls has not been instantiated.'));
+    assert(
+        isInstantiated(cls), failedAt(cls, '$cls has not been instantiated.'));
     MemberElement element = findMatchIn(cls, selector);
     if (element == null) return false;
 
     if (element.isAbstract) {
       ClassElement enclosingClass = element.enclosingClass;
       return hasConcreteMatch(enclosingClass.superclass, selector);
     }
     return selector.appliesUntyped(element);
   }
 
@@ skipping 114 matching lines @@
   @override
   void registerClosureClass(ClassElement cls) {
     throw new UnimplementedError('KernelClosedWorld.registerClosureClass');
   }
 
   @override
   bool hasElementIn(ClassEntity cls, Selector selector, Entity element) {
     throw new UnimplementedError('KernelClosedWorld.hasElementIn');
   }
 }