anchor.diff:  count_atom(_, _) ->
       0.
   
  +maps_syntax(doc) -> "Maps syntax";
  +maps_syntax(suite) -> [];
  +maps_syntax(Config) when is_list(Config) ->
  +    Ts = [{map_fun_1,
  +            <<"t() ->\n"
  +              "    M0 = #{ 1 => hi, hi => 42, 1.0 => {hi,world}},\n"
  +              "    M1 = M0#{ 1 := hello, new_val => 1337 },\n"
  +              "    map_fun_2:val(M1).\n">>},
  +          {map_fun_2,
  +            <<"val(#{ 1 := V1, hi := V2, new_val := V3}) -> {V1,V2,V3}.\n">>}],
  +    compile(Config, Ts),
  +
  +    ok = pp_expr(<<"#{}">>),
  +    ok = pp_expr(<<"#{ a => 1, <<\"hi\">> => \"world\", 33 => 1.0 }">>),
  +    ok = pp_expr(<<"#{ a := V1, <<\"hi\">> := V2 } = M">>),
  +    ok = pp_expr(<<"M#{ a => V1, <<\"hi\">> := V2 }">>),
  +    ok.
  +
  +
   otp_8567(doc) ->
       "OTP_8567. Avoid duplicated 'undefined' in record field types.";
   otp_8567(suite) -> [];
  
positive.code: 	  import_export/1, misc_attrs/1, dialyzer_attrs/1,
  	  hook/1,
  	  neg_indent/1,
  
  	  otp_6321/1, otp_6911/1, otp_6914/1, otp_8150/1, otp_8238/1,
  	  otp_8473/1, otp_8522/1, otp_8567/1, otp_8664/1, otp_9147/1,
  
negative.code:     [{expr, [],
        [func, call, recs, try_catch, if_then, receive_after,
         bits, head_tail, cond1, block, case1, ops,
         messages, old_mnemosyne_syntax, maps_syntax
      ]},
       {attributes, [], [misc_attrs, import_export, dialyzer_attrs]},
       {tickets, [],
        [otp_6321, otp_6911, otp_6914, otp_8150, otp_8238,
  