anchor.diff:  -export([leave/0]).
   -export([leave/1]).
   -export([manager/0]).
  +-export([member/1]).
   -export([members/0]).
   -export([members_for_orchestration/0]).
   -export([mynode/0]).
  
positive.code: %% argument is the Node name.
  %% @end
  %% -----------------------------------------------------------------------------
  -spec on_down(atom() | node_spec() | any | '_', function()) ->
      ok | {error, not_implemented}.
  
  on_down(Node, Function) ->
      (?MANAGER):on_down(Node, Function).
  
  
  %% -----------------------------------------------------------------------------
  
negative.code: %% argument is the Node name.
  %% @end
  %% -----------------------------------------------------------------------------
  -spec on_up(node() | node_spec() | any | '_', function()) ->
      ok | {error, not_implemented}.
  
  on_up(Node, Function) ->
  