anchor.diff:              ?assertMatch(error, Type1),
               ?assertMatch(badarg, Error1)
       end,
  -    Ctx2 = erlsha2:sha512_init(),
  +    _Ctx2 = erlsha2:sha512_init(),
       try
           NCtx2 = erlsha2:sha512_update(not_a_context, <<"a">>),
           erlsha2:sha512_final(NCtx2)
  
positive.code:             ?assertMatch(error, Type1),
              ?assertMatch(badarg, Error1)
      end,
      Ctx2 = erlsha2:sha256_init(),
      try
          NCtx2 = erlsha2:sha256_update(not_a_context, <<"a">>),
          erlsha2:sha256_final(NCtx2)
  
negative.code:             ?assertMatch(error, Type1),
              ?assertMatch(badarg, Error1)
      end,
      _Ctx2 = erlsha2:sha224_init(),
      try
          NCtx2 = erlsha2:sha224_update(not_a_context, <<"a">>),
          erlsha2:sha224_final(NCtx2)
  