a === b -> identical(a, b)

runtime/tests/vm/dart/isolate_mirror_local_test.dart

Index: runtime/tests/vm/dart/isolate_mirror_local_test.dart
diff --git a/runtime/tests/vm/dart/isolate_mirror_local_test.dart b/runtime/tests/vm/dart/isolate_mirror_local_test.dart
index 9d5ee5af36ad79ca220c911366a87bf17c47c054..821912be0be2d3db78fd4edd09a5aebeab91e73d 100644
--- a/runtime/tests/vm/dart/isolate_mirror_local_test.dart
+++ b/runtime/tests/vm/dart/isolate_mirror_local_test.dart
@@ -317,7 +317,7 @@ void testLibrariesMap(Map libraries) {
   Expect.equals('dart:core.OutOfMemoryError', oom_cls.qualifiedName);
   Expect.isFalse(oom_cls.isPrivate);
   Expect.equals('Object', oom_cls.superclass.simpleName);
-  Expect.isTrue(oom_cls.defaultFactory === null);
+  Expect.isTrue(oom_cls.defaultFactory == null);
   Expect.equals('dart:core', oom_cls.owner.simpleName);
   Expect.isTrue(oom_cls.isClass);
   Expect.equals('Error', oom_cls.superinterfaces[0].simpleName);
@@ -423,7 +423,7 @@ void testCustomInstanceMirror(InstanceMirror mirror) {
   Expect.isTrue(cls is ClassMirror);
   Expect.equals('MyClass', cls.simpleName);
   Expect.equals('MySuperClass', cls.superclass.simpleName);
-  Expect.isTrue(cls.defaultFactory === null);
+  Expect.isTrue(cls.defaultFactory == null);
   Expect.equals('isolate_mirror_local_test', cls.owner.simpleName);
   Expect.isTrue(cls.isClass);
   Expect.equals('MyInterface', cls.superinterfaces[0].simpleName);