anchor.diff:  get(_,_) -> erlang:nif_error(undef).
   
   
  -%% Shadowed by erl_bif_types: maps:find/3
   -spec find(Key,Map) -> {ok, Value} | error when
       Key :: term(),
       Map :: map(),
  
positive.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(),
  
negative.code: from_list(_) -> erlang:nif_error(undef).
  
  
  -spec is_key(Key,Map) -> boolean() when
      Key :: term(),
      Map :: map().
  