trait Wtf {
   fn do_something(&self, value: i32) -> i32;
}

struct Wat;
struct Wan;

impl Wtf for Wat {
   fn do_something(&self, value: i32) -> i32 {
       value + 42
   }
}

impl Wtf for Wan {
   fn do_something(&self, value: i32) -> i32 {
       value * value
   }
}

fn whatever_slice(value: i32, array: &[&dyn Wtf]) -> i32 {
   array.iter().map(|x| x.do_something(value)).sum()
}


pub fn whatever(value: i32) -> i32 {
   let wat: &dyn Wtf = &Wat;
   let wan: &dyn Wtf = &Wan;

   let wtfs: Vec<&dyn Wtf> = vec![wat, wan, wat, wan];
   whatever_slice(value, &wtfs)
}