anchor.diff:  
   take(_,_) -> erlang:nif_error(undef).
   
  +%% Shadowed by erl_bif_types: maps:to_list/1
   -spec to_list(Map) -> [{Key,Value}] when
       Map :: map(),
       Key :: term(),
  
positive.code: 
  find(_,_) -> erlang:nif_error(undef).
  
  
  -spec from_list(List) -> Map when
      List :: [{Key,Value}],
      Key :: term(),
  
negative.code: to_list(_) -> erlang:nif_error(undef).
  
  
  %% Shadowed by erl_bif_types: maps:update/3
  -spec update(Key,Value,Map1) -> Map2 when
      Key :: term(),
      Value :: term(),
  