deprecate UnmodifiableMapMixin.first and UnmodifiableMapMixin.last

dart-lang · Dec 20, 2024 · c2d5289 · c2d5289
1 parent b124216
commit c2d5289
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/pkgs/collection/lib/src/unmodifiable_wrappers.dart b/pkgs/collection/lib/src/unmodifiable_wrappers.dart
@@ -193,4 +193,12 @@ abstract mixin class UnmodifiableMapMixin<K, V> implements Map<K, V> {
   /// operations that change the map are disallowed.
   @override
   void clear() => _throw();
+
+  /// Throws an [UnsupportedError].
+  @Deprecated('This will be removed at a later date.')
+  set first(dynamic _) => _throw();
+
+  /// Throws an [UnsupportedError].
+  @Deprecated('This will be removed at a later date.')
+  set last(dynamic _) => _throw();
 }