Goal:
  
  x : nat
  y : nat
  h : (Z.of_nat x < Z.of_nat y)%Z
  cstr : (0 <= Z.of_nat y)%Z
  cstr0 : (0 <= Z.of_nat x)%Z
  ============================
   (Z.of_nat x + 1 < Z.of_nat y + 1)%Z


DEBUG:Going to execute:
lazymatch Zify.zify_convert_to_euclidean_division_equations_flag
           with
           | true =>
               Zify.zify_internal_to_euclidean_division_equations
           | false => idtac
           end