Serialize prefix members.

tests/compiler/dart2js/serialization/equivalence_test.dart

Index: tests/compiler/dart2js/serialization/equivalence_test.dart
diff --git a/tests/compiler/dart2js/serialization/equivalence_test.dart b/tests/compiler/dart2js/serialization/equivalence_test.dart
index 5ae58a5427bc9f761341fe32c6eae530688578a0..d021489dc4f08b2ff66f4f9a02e2a67fe2d400d0 100644
--- a/tests/compiler/dart2js/serialization/equivalence_test.dart
+++ b/tests/compiler/dart2js/serialization/equivalence_test.dart
@@ -850,7 +850,12 @@ class ElementPropertyEquivalence extends BaseElementVisitor<dynamic, Element> {
       checkElementProperties(element1, element2,
           'loadLibrary', element1.loadLibrary, element2.loadLibrary);
     }
-    // TODO(johnniwinther): Check members.
+    element1.forEachLocalMember((Element member1) {
+      String name = member1.name;
+      Element member2 = element2.lookupLocalMember(name);
+      checkElementIdentities(element1, element2, 'lookupLocalMember:$name',
+          member1, member2);
+    });
   }
 
   @override