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:
idtac
DEBUG LTAC Evaluated term: false
Level 2: Zify.zify_convert_to_euclidean_division_equations_flag
 has value 
false