Finish strong mode cleaning of dart2js.

pkg/compiler/lib/src/inferrer/node_tracer.dart

 // Copyright (c) 2013, 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 compiler.src.inferrer.node_tracer;
 
 import '../common/names.dart' show Identifiers;
 import '../compiler.dart' show Compiler;
 import '../elements/elements.dart';
 import '../types/types.dart' show ContainerTypeMask, MapTypeMask;
@@ skipping 202 matching lines @@
       addNewEscapeInformation(info);
     }
   }
 
   void analyzeStoredIntoList(ListTypeInformation list) {
     inferrer.analyzeListAndEnqueue(list);
     if (list.bailedOut) {
       bailout('Stored in a list that bailed out');
     } else {
       list.flowsInto.forEach((flow) {
-        flow.users.forEach((user) {
+        flow.users.forEach((dynamic user) {
           if (user is! DynamicCallSiteTypeInformation) return;
           if (user.receiver != flow) return;
           if (inferrer.returnsListElementTypeSet.contains(user.selector)) {
             addNewEscapeInformation(user);
           } else if (!doesNotEscapeListSet.contains(user.selector.name)) {
             bailout('Escape from a list via [${user.selector.name}]');
           }
         });
       });
     }
   }
 
   void analyzeStoredIntoMap(MapTypeInformation map) {
     inferrer.analyzeMapAndEnqueue(map);
     if (map.bailedOut) {
       bailout('Stored in a map that bailed out');
     } else {
       map.flowsInto.forEach((flow) {
-        flow.users.forEach((user) {
+        flow.users.forEach((dynamic user) {
           if (user is! DynamicCallSiteTypeInformation) return;
           if (user.receiver != flow) return;
           if (user.selector.isIndex) {
             addNewEscapeInformation(user);
           } else if (!doesNotEscapeMapSet.contains(user.selector.name)) {
             bailout('Escape from a map via [${user.selector.name}]');
           }
         });
       });
     }
@@ skipping 132 matching lines @@
     }
 
     if (info.targetsIncludeComplexNoSuchMethod(inferrer) &&
         info.arguments != null &&
         info.arguments.contains(currentUser)) {
       bailout('Passed to noSuchMethod');
     }
 
     Iterable<Element> inferredTargetTypes =
         info.targets.map((MemberElement element) {
+      // TODO(ahe): Is this a bug?

[ahe, 2017/06/15 09:36:39]

I'll file a bug and update the comment.

[ahe, 2017/06/15 11:41:57]

Done.

+      // ignore: RETURN_OF_INVALID_TYPE
       return inferrer.types.getInferredTypeOf(element);
     });
     if (inferredTargetTypes.any((user) => user == currentUser)) {
       addNewEscapeInformation(info);
     }
   }
 
   /**
    * Check whether element is the parameter of a list adding method.
    * The definition of what a list adding method is has to stay in sync with
@@ skipping 66 matching lines @@
     }
     if (isParameterOfListAddingMethod(element) ||
         isParameterOfMapAddingMethod(element)) {
       // These elements are being handled in
       // [visitDynamicCallSiteTypeInformation].
       return;
     }
     addNewEscapeInformation(info);
   }
 }