Swappy

swappy.rs

#[derive(Debug)]
enum Switchy<A,B>
{ Nil
, Cons(A, Box<Switchy<B,A>>)
}

impl<A,B> Switchy<A,B>
{ fn cons(t : A, tail : Switchy<B,A>)->Self 
  { Self::Cons(t, Box::new(tail)) }
}

pub fn main()
{ type L<A,B> = Switchy<A,B>
; let l = L::cons(1, L::cons("horror", L::cons(3, L::cons("why", L::cons(4, L::Nil)))))
; println!{"{l:?}"}
;
}