Goal:
    a : byte  b : byte  e : NoConfusion_byte a b
  ============================
   (noConfusion_byte_obligation_2 a b (noConfusion_byte_obligation_1 a b e) =
    e)


DEBUG:Going to execute:
match goal with
           | H:Tactics.fix_proto _ |- _ => Tactics.destruct_calls H; clear H
           end