Fixes #428. Make test stronger (choose static types explicitly)
diff --git a/LanguageFeatures/Extension-methods/extension_member_resolution_t04.dart b/LanguageFeatures/Extension-methods/extension_member_resolution_t04.dart
index 399703a..62b7432 100644
--- a/LanguageFeatures/Extension-methods/extension_member_resolution_t04.dart
+++ b/LanguageFeatures/Extension-methods/extension_member_resolution_t04.dart
@@ -22,9 +22,9 @@
 }
 
 main() {
-  var list1 = [new C(), new C()];
+  List<C> list1 = [];
   Expect.isTrue(list1.method() is C);
 
-  var list2 = [new A(), new C()];
+  List<A> list2 = [];
   Expect.isTrue(list2.method() is A);
 }