anchor.diff:  
   -export([behaviour_info/1]).
   
  +-export([maybe_create_hashtrees/3,
  +         update_hashtree/4]).
   
   -export([aae_repair/2,
            hash_object/2,
  
positive.code:      {hashtree_pid, 1},
       {master, 0},
       {rehash, 3}];
  behaviour_info(_Other) ->
      undefined.
  
  
  %% @doc aae_repair is called when the AAE system detectes a difference
  
negative.code:          hashtree_pid/1,
           master/0,
           rehash/3]).
  
  -xref_ignore([aae_repair/2,
                hash_object/2,
                request_hashtree_pid/1,
                hashtree_pid/1,
                master/0,
                rehash/3]).
  
  -define(DEFAULT_HASHTREE_TOKENS, 90).
  
  -type preflist() :: [{Index::integer(), Node :: term()}].
  
  