Check closure data for serialization

pkg/compiler/lib/src/serialization/equivalence.dart

Index: pkg/compiler/lib/src/serialization/equivalence.dart
diff --git a/pkg/compiler/lib/src/serialization/equivalence.dart b/pkg/compiler/lib/src/serialization/equivalence.dart
index be8ff7fc8a2fe65415fb46c95a77a21d03c157a6..ab8f78e8931f8846917412faf186fc7c76fbd40a 100644
--- a/pkg/compiler/lib/src/serialization/equivalence.dart
+++ b/pkg/compiler/lib/src/serialization/equivalence.dart
@@ -6,6 +6,7 @@
 
 library dart2js.serialization.equivalence;
 
+import '../closure.dart';
 import '../common.dart';
 import '../common/resolution.dart';
 import '../constants/expressions.dart';
@@ -405,6 +406,14 @@ class ElementIdentityEquivalence extends BaseElementVisitor<bool, Element> {
   }
 
   @override
+  bool visitBoxFieldElement(
+      BoxFieldElement element1, BoxFieldElement element2) {
+    return element1.box.name == element2.box.name &&
+        visit(element1.box.executableContext, element2.box.executableContext) &&
+        visit(element1.variableElement, element2.variableElement);
+  }
+
+  @override
   bool visitConstructorElement(
       ConstructorElement element1, ConstructorElement element2) {
     return checkMembers(element1, element2);
@@ -822,7 +831,11 @@ bool testTreeElementsEquivalence(
   TreeElementsEquivalenceVisitor visitor = new TreeElementsEquivalenceVisitor(
       indices1, indices2, elements1, elements2, strategy);
   resolvedAst1.node.accept(visitor);
-  return visitor.success;
+  if (visitor.success) {
+    return strategy.test(elements1, elements2, 'containsTryStatement',
+        elements1.containsTryStatement, elements2.containsTryStatement);
+  }
+  return false;
 }
 
 /// Visitor that checks the equivalence of [TreeElements] data.