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:let _ := fixproto in _
             |- _ => red in H; CoreTactics.destruct_calls H; clear H
           end