Fixed Issue #424: typo corrected.
diff --git a/LanguageFeatures/Extension-methods/extension_conflict_resolution_t04.dart b/LanguageFeatures/Extension-methods/extension_conflict_resolution_t04.dart
index 93a9fe9..e379b7f 100644
--- a/LanguageFeatures/Extension-methods/extension_conflict_resolution_t04.dart
+++ b/LanguageFeatures/Extension-methods/extension_conflict_resolution_t04.dart
@@ -36,5 +36,5 @@
 
 main() {
   List<int> aList = <int>[1, 2, 3];
-  Expect.isFalse(aList.isIntLibraryVersion);
+  Expect.isTrue(aList.isIntLibraryVersion);
 }