anchor.diff:  
     const E2(Object val);
     static void set values(List<E2> value) {}
  -//                ^^^^^^
  -// [analyzer] unspecified
  -// [cfe] unspecified
   }
   
   main() {
  
positive.code:   e3;
  
    static void set values(int value) {}
  //                ^^^^^^
  // [analyzer] unspecified
  // [cfe] unspecified
  }
  
  enum E2<T> {
  
negative.code: /// declaration.
  ///
  /// @description Check that it's a compile-time error if the enum declaration
  /// contains a static setter with the name `values`, and its argument is not a
  /// supertype of the generated member `values`.
  /// @author sgrekhov@unipro.ru
  /// @issue 48387
  
  