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:
lazymatch goal with
           | |- ?f _ _ ?g = ?e => generalize g; revert e
           end; intros e g