anchor.diff:  
   -callback master() -> Master::atom().
   
  -behaviour_info(_Other) ->
  -    undefined.
   
   %%%===================================================================
   %%% AAE Calls
  
positive.code: %%%===================================================================
  %%% Behaviour callbacks
  %%%===================================================================
  
  -spec behaviour_info(atom()) -> 'undefined' | [{atom(), arity()}].
  behaviour_info(callbacks) ->
      [{aae_repair, 2},
       {hash_object, 2},
       {master, 0}];
  
  %% @doc aae_repair is called when the AAE system detectes a difference
  %% the simplest method to handle this is causing a read-repair if the
  
negative.code: -module(riak_core_aae_vnode).
  
  -export([maybe_create_hashtrees/4,
           update_hashtree/4]).
  