Goal:
  
  y : byte
  Hlt : BinInt.Z.lt (BinInt.Z.of_N (to_N y)) (BinInt.Z.of_N (to_N y))
  cstr : BinInt.Z.le Z0 (BinInt.Z.of_N (to_N y))
  ============================
   False


DEBUG:Going to execute:
zify_saturate