anchor.diff:  
   %% @doc Registers a process in the `default' scope.
   %%
  -%% Same as calling `register(default, Name, Pid, undefined)', see {@link register/4}.
  +%% @equiv register(default, Name, Pid, undefined)
  +%% @end
   %%
   %% <h2>Examples</h2>
   %% <h3>Elixir</h3>
  
positive.code: 
  %% @doc Returns the count of all registered processes for the `default' scope.
  %%
  %% Same as calling `registry_count(default)', see {@link registry_count/1}.
  %%
  %% <h2>Examples</h2>
  %% <h3>Elixir</h3>
  
negative.code: 
  %% @doc Returns whether a `pid()' is a member of GroupName in the `default' scope.
  %%
  %% @equiv is_member(default, GroupName, Pid)
  %% @end
  -spec is_member(GroupName :: any(), Pid :: pid()) -> boolean().
  is_member(GroupName, Pid) ->
      syn_groups:is_member(GroupName, Pid).
  