Goal:
  
  T : Type
  Listable_T : Listable T
  FinitelyListable_T : FinitelyListable T
  x : T
  y : T
  ============================
   (x = y -> eqb_of_listable x y = true)


DEBUG:Going to execute:
intros; subst
DEBUG LTAC Evaluated term: Nat.eqb_refl