anchor.diff:  %% ====================================================================
   %% @doc Renders redirection point.
   %% @end
  --spec redirection_point(RedirectionPoint :: binary()) -> Result when
  +-spec redirection_point(RedirectionPoint :: binary() | undefined) -> Result when
       Result :: #p{}.
   %% ====================================================================
   redirection_point(undefined) ->
  
positive.code: %% ====================================================================
  %% @doc Renders provider ID.
  %% @end
  -spec providerId(ProviderId :: binary()) -> Result when
      Result :: #span{}.
  %% ====================================================================
  providerId(undefined) ->
  
negative.code: %% ====================================================================
  %% @doc Renders provider's name.
  %% @end
  -spec providerName(ProviderName :: binary() | undefined) -> Result when
      Result :: #p{}.
  %% ====================================================================
  providerName(undefined) ->
  