Fixes #449. Fix typo and missing import added
diff --git a/LanguageFeatures/Extension-methods/syntax_type_t03.dart b/LanguageFeatures/Extension-methods/syntax_type_t03.dart
index 9a80ee7..3490e4d 100644
--- a/LanguageFeatures/Extension-methods/syntax_type_t03.dart
+++ b/LanguageFeatures/Extension-methods/syntax_type_t03.dart
@@ -19,6 +19,7 @@
* @author sgrekhov@unipro.ru
*/
// SharedOptions=--enable-experiment=extension-methods
+import "dart:async";
extension MyInt on int {}
@@ -30,7 +31,7 @@
extension MyString on String {}
-extension MyString on void {}
+extension MyVoid on void {}
extension MyDynamic on dynamic {}