A step towards handling `new Object()` in compile_from_dill_test

pkg/compiler/lib/src/closure.dart

Index: pkg/compiler/lib/src/closure.dart
diff --git a/pkg/compiler/lib/src/closure.dart b/pkg/compiler/lib/src/closure.dart
index 5611c40773068cd12b9d6c64556f793164f7c80d..531dfceb866beb8b29a17d00820411c4f32b17d5 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -150,7 +150,8 @@ class ClosureFieldElement extends ElementX
   MemberElement get memberContext => closureClass.methodElement.memberContext;
 
   @override
-  Entity get declaredEntity => local;
+  Local get declaredEntity => local;
+
   @override
   Entity get rootOfScope => closureClass;
 
@@ -292,6 +293,7 @@ class BoxLocal extends Local {
 // find a more general solution.
 class BoxFieldElement extends ElementX
     implements TypedElement, FieldElement, PrivatelyNamedJSEntity {
+  final LocalVariableElement variableElement;
   final BoxLocal box;
 
   BoxFieldElement(String name, this.variableElement, BoxLocal box)
@@ -303,12 +305,11 @@ class BoxFieldElement extends ElementX
   ResolutionDartType get type => variableElement.type;
 
   @override
-  Entity get declaredEntity => variableElement;
+  Local get declaredEntity => variableElement;
+
   @override
   Entity get rootOfScope => box;
 
-  final VariableElement variableElement;
-
   accept(ElementVisitor visitor, arg) {
     return visitor.visitBoxFieldElement(this, arg);
   }
@@ -1243,8 +1244,8 @@ class TypeVariableLocal implements Local {
 ///
 /// Move the below classes to a JS model eventually.
 ///
-abstract class JSEntity implements Entity {
-  Entity get declaredEntity;
+abstract class JSEntity implements MemberEntity {
+  Local get declaredEntity;
 }
 
 abstract class PrivatelyNamedJSEntity implements JSEntity {