Goal:
    x : V.t  n : Z  y : V.t  H0 : V.eq x x  H1 : n < n
  ============================
   False


DEBUG:Going to execute:
PTRDEBUGTACmatch goal with
           | |- _ -> _ => intro; t_tauto_intuit
           | |- _ => t_reduce; t_solver
           end