anchor.diff:  first_after(Data, Offset) ->
       case byte_size(Data) > Offset of
   	false ->
  -	    {First, Rest} = {ok, ok},
  +	    {_First, _Rest} = {ok, ok},
   	    ok;
   	true ->
   	    <<_:Offset/binary, Rest/binary>> = Data,
  
positive.code:     [].
  
  guard(_Config) ->
      Tuple = id({a,b}),
      ok = guard_1(<<1,2,3>>, {1,2,3}),
      ok = guard_2(<<42>>, #{}),
      ok.
  
negative.code:         {this_hdr = 17,
           ext_hdr_opts}).
  
  get_payload(_Config) ->
      <<3445:48>> = do_get_payload(#ext_header{ext_hdr_opts = <<3445:48>>}),
      {'EXIT',_} = (catch do_get_payload(#ext_header{})),
      ok.
  