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


DEBUG:Going to execute:
<coq-core.plugins.ltac::auto@0> $1 $2 $3