Use failedAt in more places

pkg/compiler/lib/src/closure.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 closureToClassMapper;
 
 import 'common/names.dart' show Identifiers;
 import 'common/resolution.dart' show ParsingContext, Resolution;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
@@ skipping 26 matching lines @@
 
   /// Returns the [ClosureClassMap] computed for [resolvedAst].
   ClosureClassMap getClosureToClassMapping(ResolvedAst resolvedAst) {
     return measure(() {
       Element element = resolvedAst.element;
       if (element.isGenerativeConstructorBody) {
         ConstructorBodyElement constructorBody = element;
         element = constructorBody.constructor;
       }
       ClosureClassMap closureClassMap = _closureMappingCache[element];
-      assert(invariant(resolvedAst.element, closureClassMap != null,
-          message: "No ClosureClassMap computed for ${element}."));
+      assert(
+          closureClassMap != null,
+          failedAt(resolvedAst.element,
+              "No ClosureClassMap computed for ${element}."));
       return closureClassMap;
     });
   }
 
   /// Create [ClosureClassMap]s for all live members.
   void createClosureClasses(ClosedWorldRefiner closedWorldRefiner) {
     compiler.enqueuer.resolution.processedEntities
         .forEach((MemberElement element) {
       ResolvedAst resolvedAst = element.resolvedAst;
       if (element.isAbstract) return;
@@ skipping 27 matching lines @@
         // The translator will store the computed closure-mappings inside the
         // cache. One for given node and one for each nested closure.
         if (node is FunctionExpression) {
           translator.translateFunction(element, node);
         } else if (element.isSynthesized) {
           reporter.internalError(
               element, "Unexpected synthesized element: $element");
           _closureMappingCache[element] =
               new ClosureClassMap(null, null, null, new ThisLocal(element));
         } else {
-          assert(invariant(element, element.isField,
-              message: "Expected $element to be a field."));
+          assert(element.isField,
+              failedAt(element, "Expected $element to be a field."));
           Node initializer = resolvedAst.body;
           if (initializer != null) {
             // The lazy initializer of a static.
             translator.translateLazyInitializer(element, node, initializer);
           } else {
-            assert(invariant(element, element.isInstanceMember,
-                message: "Expected $element (${element
-                    .runtimeType}) to be an instance field."));
+            assert(
+                element.isInstanceMember,
+                failedAt(
+                    element,
+                    "Expected $element (${element.runtimeType}) "
+                    "to be an instance field."));
             _closureMappingCache[element] =
                 new ClosureClassMap(null, null, null, new ThisLocal(element));
           }
         }
-        assert(invariant(element, _closureMappingCache[element] != null,
-            message: "No ClosureClassMap computed for ${element}."));
+        assert(_closureMappingCache[element] != null,
+            failedAt(element, "No ClosureClassMap computed for ${element}."));
         return _closureMappingCache[element];
       });
     });
   }
 }
 
 /// Common interface for [BoxFieldElement] and [ClosureFieldElement] as
 /// non-elements.
 // TODO(johnniwinther): Remove `implements Element`.
 abstract class CapturedVariable implements Element {}
@@ skipping 1100 matching lines @@
 ///
 /// Move the below classes to a JS model eventually.
 ///
 abstract class JSEntity implements Entity {
   Entity get declaredEntity;
 }
 
 abstract class PrivatelyNamedJSEntity implements JSEntity {
   Entity get rootOfScope;
 }