anchor.diff:  }
   
   class Weapon extends Card {
  -  final String weapon;
  -  const Weapon._(this.weapon);
  +  const Weapon._(this.name);
     static final Weapon KNIFE =
         const Weapon._("KNIFE");
     static final Weapon CANDLESTICK =
  
positive.code: 
  
  abstract class Card {
    const Card();
  }
  
  class Character extends Card {
    final String character; 
    
    const Character._(this.character);
    
    static final Character SCARLET =
        const Character._("SCARLET");
  
negative.code: }
  
  class Room extends Card {
    const Room._(this.name);
    
    static final Room HALL =
        const Room._("HALL");
  