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


DEBUG:Going to execute:
try Tactics.program_solve_wf
Level 0: Backtrace:

Tactic failure: Proof search failed without reaching its limit.
Level 0: Backtrace:

Tactic failure: Proof search failed without reaching its limit.