Goal:
    A : Type  n : nat  hd : A  tl : list A  H : S n < #|hd :: tl|
  ============================
   (n < #|tl|)


DEBUG:Going to execute:
auto
DEBUG LTAC Evaluated term: (n < #|tl|)
DEBUG LTAC Evaluated term: Prop
Level 3: type of T
 has value 
Prop