Null aware test fixed
diff --git a/LanguageFeatures/nnbd/null_aware_operator_A13_t13.dart b/LanguageFeatures/nnbd/null_aware_operator_A13_t13.dart
index 115dda2..558d1d7 100644
--- a/LanguageFeatures/nnbd/null_aware_operator_A13_t13.dart
+++ b/LanguageFeatures/nnbd/null_aware_operator_A13_t13.dart
@@ -21,10 +21,17 @@
 
 class C {
   List<int>? _list = [3, 1, 4];
-  int operator [](int index) => _list != null ? _list[index] : -1;
+  int operator [](int index) {
+    List<int>? list = _list;
+    if (list != null) {
+      return list[index];
+    }
+    return -1;
+  }
   void operator []=(int index, dynamic value) {
-    if (_list != null) {
-      _list[index] = value;
+    List<int>? list = _list;
+    if (list != null) {
+      list[index] = value;
     }
   }