Goal:
    b : byte
  ============================
   (noConfusion_byte_obligation_1 b b
      (noConfusion_byte_obligation_2 b b eq_refl) = eq_refl)


DEBUG:Going to execute:
match goal with
           | H':?Y
             |- _ =>
                 match H with
                 | H' => fail 2
                 | _ => unify X Y; clear H' || clear H
                 end
           end