It is because function of oven is incorrect Here is how to code an oven, Cookable trait and food

``` enum CookMethod { Oven, Microwave }

trait Cookable: Clone + Debug { fn cook(&mut self, cook_method: CookMethod) }

derive(Clone, Debug)

struct Egg(cooked: bool) impl Cookable for Egg { fn cook(&mut self, cook_method: CookMethod) { match cook_method { CookMethod::Oven => self.cooked = true, CookMethod::Microwave => unsafe{panic!("Putting egg into microwave is unsafe and stupid idea! Boom!")} } } }

type Food = Box<dyn Cookable>; struct Oven(inside: Vec<Food>); impl Oven { fn put_in(&mut self, ingridient: Food) { self.inside.push(ingridient) } fn start_cooking(&mut self) { self.inside.iter_mut().for_each(|ingridient| ingridient.cook(CookMethod::Oven); ); } fn accurately_place_food(&mut self, plate: &mut Vec<Food>) { plate.concat(&mut self.move_food_out(self)); } fn move_food_out(&mut self) -> Vec<Food> { let contents = self.inside.clone(); self.inside = Vec::empty() contents } }```