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


DEBUG:Going to execute:
try typeclasses eauto  10 with program
Level 2: Backtrace:

No primitive equality found.
Level 2: Backtrace:

No primitive equality found.
Level 1: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 1: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 1: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No primitive equality found.
Level 0: Backtrace:

No applicable tactic.