Fixes #1263. Add default value to non-nullable parameter
diff --git a/LanguageFeatures/Super-parameters/summary_A03_t01.dart b/LanguageFeatures/Super-parameters/summary_A03_t01.dart
index ceaad46..49b9b1f 100644
--- a/LanguageFeatures/Super-parameters/summary_A03_t01.dart
+++ b/LanguageFeatures/Super-parameters/summary_A03_t01.dart
@@ -21,7 +21,7 @@
 
 class C extends S {
   int c;
-  C(this.c, [super.s, int x]);
+  C(this.c, [super.s, int x = 0]);
 }
 
 main() {