Prefix operators added
diff --git a/LanguageFeatures/nnbd/static_errors_A28_t04.dart b/LanguageFeatures/nnbd/static_errors_A28_t04.dart
index e41ce49..3eb98d6 100644
--- a/LanguageFeatures/nnbd/static_errors_A28_t04.dart
+++ b/LanguageFeatures/nnbd/static_errors_A28_t04.dart
@@ -22,9 +22,18 @@
// ^^
// [analyzer] unspecified
// [cfe] unspecified
+ ++x;
+//^^
+// [analyzer] unspecified
+// [cfe] unspecified
x--;
// ^^
// [analyzer] unspecified
// [cfe] unspecified
+
+ --x;
+//^^
+// [analyzer] unspecified
+// [cfe] unspecified
}