Hands-On Rust: Effective Learning Through 2D Game Development and Play(pragprog.com)

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  struct Entity {
      components: Vec<Box<dyn Component>>,
  }

  Each item you’re adding provides only one effect. It’s tempting to
  create a generic UseEffect component containing an enumeration.
  Enums can only have one value—if you want to make an item with
  multiple effects, you’d be out of luck. It’s a good idea to separate
  effects into their own components in case you decide to create an
  item that does more than one thing.

  enum ItemEffect {
      Heal(i32),
      Poison(i32),
      Explode,
      MultiEffect<Vec<Box<dyn ItemEffect>>>,
  }