anchor.diff:  -export([abs/1, append/2, element/2, get_module_info/2, hd/1,
            is_atom/1, is_binary/1, is_bitstring/1, is_boolean/1,
            is_float/1, is_function/1, is_function/2, is_integer/1,
  -         is_list/1, is_number/1, is_pid/1, is_port/1, is_record/2,
  +         is_list/1, is_map/1, is_number/1, is_pid/1, is_port/1, is_record/2,
            is_record/3, is_reference/1, is_tuple/1, load_module/2,
            load_nif/2, localtime_to_universaltime/2, make_fun/3,
            make_tuple/2, make_tuple/3, nodes/1, open_port/2,
  
positive.code: make_ref() ->
      erlang:nif_error(undefined).
  
  %% match_spec_test/3
  -spec erlang:match_spec_test(P1, P2, P3) -> TestResult when
        P1 :: [term()] | tuple(),
  
negative.code: -spec is_pid(Term) -> boolean() when
        Term :: term().
  is_pid(_Term) ->
      erlang:nif_error(undefined).
  
  %% Shadowed by erl_bif_types: erlang:is_map/1
  -spec is_map(Map) -> boolean() when
        Map :: map().
  is_map(_Map) ->
      erlang:nif_error(undefined).
  
  %% Shadowed by erl_bif_types: erlang:is_port/1
  