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%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2013. All Rights Reserved.
%% 
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%% 
%% %CopyrightEnd%
%%
-module(map_SUITE).
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	init_per_group/2,end_per_group/2
    ]).

-export([
	%% literals
	t_build_and_match_literals/1, t_build_and_match_literals_large/1,
	t_update_literals/1, t_update_literals_large/1,
        t_match_and_update_literals/1, t_match_and_update_literals_large/1,
	t_update_map_expressions/1,
	t_update_assoc/1, t_update_assoc_large/1,
        t_update_exact/1, t_update_exact_large/1,
	t_guard_bifs/1,
        t_guard_sequence/1, t_guard_sequence_large/1,
        t_guard_update/1, t_guard_update_large/1,
	t_guard_receive/1, t_guard_receive_large/1,
        t_guard_fun/1,
	t_list_comprehension/1,
	t_map_sort_literals/1,
	t_map_size/1,
	t_build_and_match_aliasing/1,
	t_is_map/1,

	%% variables
	t_build_and_match_variables/1,
	t_update_assoc_variables/1,t_update_exact_variables/1,
	t_nested_pattern_expressions/1,
	t_guard_update_variables/1,
	t_guard_sequence_variables/1,
	t_guard_sequence_mixed/1,
	t_frequency_table/1,

	%% warnings
	t_warn_useless_build/1,
	t_warn_pair_key_overloaded/1,

	%% not covered in 17.0-rc1
	t_build_and_match_over_alloc/1,
	t_build_and_match_empty_val/1,
	t_build_and_match_val/1,
	t_build_and_match_nil/1,
	t_build_and_match_structure/1,

	%% errors in 17.0-rc1
	t_update_values/1,
        t_expand_map_update/1,
        t_export/1,

	%% errors in 18
        t_register_corruption/1,
	t_bad_update/1

    ]).

suite() -> [].

all() ->
    test_lib:recompile(?MODULE),
    [
	%% literals
	t_build_and_match_literals, t_build_and_match_literals_large,
	t_update_literals, t_update_literals_large,
        t_match_and_update_literals, t_match_and_update_literals_large,
	t_update_map_expressions,
	t_update_assoc, t_update_assoc_large,
        t_update_exact, t_update_exact_large,
	t_guard_bifs,
        t_guard_sequence, t_guard_sequence_large,
        t_guard_update, t_guard_update_large,
	t_guard_receive, t_guard_receive_large,
        t_guard_fun, t_list_comprehension,
	t_map_sort_literals,
	t_map_size,
	t_build_and_match_aliasing,
	t_is_map,

	%% variables
	t_build_and_match_variables,
	t_update_assoc_variables,t_update_exact_variables,
	t_nested_pattern_expressions,
	t_guard_update_variables,
	t_guard_sequence_variables,
	t_guard_sequence_mixed,
	t_frequency_table,

	%% warnings
	t_warn_useless_build,
	t_warn_pair_key_overloaded,

	%% not covered in 17.0-rc1
	t_build_and_match_over_alloc,
	t_build_and_match_empty_val,
	t_build_and_match_val,
	t_build_and_match_nil,
	t_build_and_match_structure,

	%% errors in 17.0-rc1
	t_update_values,
        t_expand_map_update,
        t_export,

	%% errors in 18
        t_register_corruption,
        t_bad_update
    ].

groups() -> [].

init_per_suite(Config) -> Config.
end_per_suite(_Config) -> ok.

init_per_group(_GroupName, Config) -> Config.
end_per_group(_GroupName, Config) -> Config.

%% tests

t_build_and_match_literals(Config) when is_list(Config) ->
    #{} = id(#{}),
    #{1:=a} = id(#{1=>a}),
    #{1:=a,2:=b} = id(#{1=>a,2=>b}),
    #{1:=a,2:=b,3:="c"} = id(#{1=>a,2=>b,3=>"c"}),
    #{1:=a,2:=b,3:="c","4":="d"} = id(#{1=>a,2=>b,3=>"c","4"=>"d"}),
    #{1:=a,2:=b,3:="c","4":="d",<<"5">>:=<<"e">>} =
	id(#{1=>a,2=>b,3=>"c","4"=>"d",<<"5">>=><<"e">>}),
    #{1:=a,2:=b,3:="c","4":="d",<<"5">>:=<<"e">>,{"6",7}:="f"} =
	id(#{1=>a,2=>b,3=>"c","4"=>"d",<<"5">>=><<"e">>,{"6",7}=>"f"}),
    #{1:=a,2:=b,3:="c","4":="d",<<"5">>:=<<"e">>,{"6",7}:="f",8:=g} =
	id(#{1=>a,2=>b,3=>"c","4"=>"d",<<"5">>=><<"e">>,{"6",7}=>"f",8=>g}),

    #{<<"hi all">> := 1} = id(#{<<"hi",32,"all">> => 1}),

    #{a:=X,a:=X=3,b:=4} = id(#{a=>3,b=>4}), % weird but ok =)

    #{ a:=#{ b:=#{c := third, b:=second}}, b:=first} =
	id(#{ b=>first, a=>#{ b=>#{c => third, b=> second}}}),

    M = #{ map_1=>#{ map_2=>#{value_3 => third}, value_2=> second}, value_1=>first},
    M = #{ map_1:=#{ map_2:=#{value_3 := third}, value_2:= second}, value_1:=first} =
	 id(#{ map_1=>#{ map_2=>#{value_3 => third}, value_2=> second}, value_1=>first}),

    %% map key
    #{ #{} := 42 } = id(#{ #{} => 42 }),
    #{ #{ "a" => 3 } := 42 } = id(#{ #{ "a" => 3} => 42 }),

    %% nil key
    #{[]:=ok,1:=2} = id(#{[]=>ok,1=>2}),
    #{1:=2,[]:=ok,1:=2} = id(#{[]=>ok,1=>2}),

    %% pseudo literals
    #{ -3 := yep } = id(#{ -3 => yep }),
    #{ <<0:358>> := "three" } = id(#{<<0:358>> =>"three"}),

    %% error case
    {'EXIT',{{badmatch,_},_}} = (catch (#{x:=3,x:=2} = id(#{x=>3}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{x:=2} = id(#{x=>3}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{x:=3} = id({a,b,c}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{x:=3} = id(#{y=>3}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{x:=3} = id(#{x=>"three"}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{#{"a"=>42} := 3}=id(#{#{"a"=>3}=>42}))),
    ok.

t_build_and_match_literals_large(Config) when is_list(Config) ->
    % normal non-repeating
    M0 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" }),

    #{10:=a0,20:=b0,30:="c0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M0,
    #{11:=a1,21:=b1,31:="c1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M0,
    #{12:=a2,22:=b2,32:="c2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M0,
    #{13:=a3,23:=b3,33:="c3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M0,
    #{14:=a4,24:=b4,34:="c4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M0,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M0,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M0,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M0,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M0,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M0,

    60 = map_size(M0),
    60 = maps:size(M0),

    % with repeating
    M1 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               10=>na0,20=>nb0,30=>"nc0","40"=>"nd0",<<"50">>=>"ne0",{["00"]}=>"n10",
               11=>na1,21=>nb1,31=>"nc1","41"=>"nd1",<<"51">>=>"ne1",{["01"]}=>"n11",
               12=>na2,22=>nb2,32=>"nc2","42"=>"nd2",<<"52">>=>"ne2",{["02"]}=>"n12",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",

               13=>na3,23=>nb3,33=>"nc3","43"=>"nd3",<<"53">>=>"ne3",{["03"]}=>"n13",
               14=>na4,24=>nb4,34=>"nc4","44"=>"nd4",<<"54">>=>"ne4",{["04"]}=>"n14",

               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" }),

    #{10:=na0,20:=nb0,30:="nc0","40":="nd0",<<"50">>:="ne0",{["00"]}:="n10"} = M1,
    #{11:=na1,21:=nb1,31:="nc1","41":="nd1",<<"51">>:="ne1",{["01"]}:="n11"} = M1,
    #{12:=na2,22:=nb2,32:="nc2","42":="nd2",<<"52">>:="ne2",{["02"]}:="n12"} = M1,
    #{13:=na3,23:=nb3,33:="nc3","43":="nd3",<<"53">>:="ne3",{["03"]}:="n13"} = M1,
    #{14:=na4,24:=nb4,34:="nc4","44":="nd4",<<"54">>:="ne4",{["04"]}:="n14"} = M1,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M1,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M1,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M1,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M1,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M1,

    60 = map_size(M1),
    60 = maps:size(M1),

    % with floats

    M2 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19",

               10.0=>fa0,20.0=>fb0,30.0=>"fc0",
               11.0=>fa1,21.0=>fb1,31.0=>"fc1",
               12.0=>fa2,22.0=>fb2,32.0=>"fc2",
               13.0=>fa3,23.0=>fb3,33.0=>"fc3",
               14.0=>fa4,24.0=>fb4,34.0=>"fc4",

               15.0=>fa5,25.0=>fb5,35.0=>"fc5",
               16.0=>fa6,26.0=>fb6,36.0=>"fc6",
               17.0=>fa7,27.0=>fb7,37.0=>"fc7",
               18.0=>fa8,28.0=>fb8,38.0=>"fc8",
               19.0=>fa9,29.0=>fb9,39.0=>"fc9"}),

    #{10:=a0,20:=b0,30:="c0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M2,
    #{11:=a1,21:=b1,31:="c1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M2,
    #{12:=a2,22:=b2,32:="c2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M2,
    #{13:=a3,23:=b3,33:="c3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M2,
    #{14:=a4,24:=b4,34:="c4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M2,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M2,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M2,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M2,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M2,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M2,

    #{10.0:=fa0,20.0:=fb0,30.0:="fc0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M2,
    #{11.0:=fa1,21.0:=fb1,31.0:="fc1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M2,
    #{12.0:=fa2,22.0:=fb2,32.0:="fc2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M2,
    #{13.0:=fa3,23.0:=fb3,33.0:="fc3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M2,
    #{14.0:=fa4,24.0:=fb4,34.0:="fc4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M2,

    #{15.0:=fa5,25.0:=fb5,35.0:="fc5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M2,
    #{16.0:=fa6,26.0:=fb6,36.0:="fc6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M2,
    #{17.0:=fa7,27.0:=fb7,37.0:="fc7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M2,
    #{18.0:=fa8,28.0:=fb8,38.0:="fc8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M2,
    #{19.0:=fa9,29.0:=fb9,39.0:="fc9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M2,

    90 = map_size(M2),
    90 = maps:size(M2),

    % with bignums
    M3 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19",

               10.0=>fa0,20.0=>fb0,30.0=>"fc0",
               11.0=>fa1,21.0=>fb1,31.0=>"fc1",
               12.0=>fa2,22.0=>fb2,32.0=>"fc2",
               13.0=>fa3,23.0=>fb3,33.0=>"fc3",
               14.0=>fa4,24.0=>fb4,34.0=>"fc4",

               15.0=>fa5,25.0=>fb5,35.0=>"fc5",
               16.0=>fa6,26.0=>fb6,36.0=>"fc6",
               17.0=>fa7,27.0=>fb7,37.0=>"fc7",
               18.0=>fa8,28.0=>fb8,38.0=>"fc8",
               19.0=>fa9,29.0=>fb9,39.0=>"fc9",

               36893488147419103232=>big1,  73786976294838206464=>big2,
               147573952589676412928=>big3, 18446744073709551616=>big4,
               4294967296=>big5,            8589934592=>big6,
               4294967295=>big7,            67108863=>big8
             }),

    #{10:=a0,20:=b0,30:="c0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M3,
    #{11:=a1,21:=b1,31:="c1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M3,
    #{12:=a2,22:=b2,32:="c2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M3,
    #{13:=a3,23:=b3,33:="c3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M3,
    #{14:=a4,24:=b4,34:="c4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M3,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M3,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M3,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M3,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M3,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M3,

    #{10.0:=fa0,20.0:=fb0,30.0:="fc0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M3,
    #{11.0:=fa1,21.0:=fb1,31.0:="fc1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M3,
    #{12.0:=fa2,22.0:=fb2,32.0:="fc2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M3,
    #{13.0:=fa3,23.0:=fb3,33.0:="fc3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M3,
    #{14.0:=fa4,24.0:=fb4,34.0:="fc4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M3,

    #{15.0:=fa5,25.0:=fb5,35.0:="fc5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M3,
    #{16.0:=fa6,26.0:=fb6,36.0:="fc6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M3,
    #{17.0:=fa7,27.0:=fb7,37.0:="fc7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M3,
    #{18.0:=fa8,28.0:=fb8,38.0:="fc8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M3,
    #{19.0:=fa9,29.0:=fb9,39.0:="fc9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M3,

    #{36893488147419103232:=big1,67108863:=big8,"45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M3,
    #{147573952589676412928:=big3,8589934592:=big6,"46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M3,
    #{4294967296:=big5,18446744073709551616:=big4,"47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M3,
    #{4294967295:=big7,73786976294838206464:=big2,"48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M3,

    98 = map_size(M3),
    98 = maps:size(M3),

    %% with maps

    M4 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19",

               10.0=>fa0,20.0=>fb0,30.0=>"fc0",
               11.0=>fa1,21.0=>fb1,31.0=>"fc1",
               12.0=>fa2,22.0=>fb2,32.0=>"fc2",
               13.0=>fa3,23.0=>fb3,33.0=>"fc3",
               14.0=>fa4,24.0=>fb4,34.0=>"fc4",

               15.0=>fa5,25.0=>fb5,35.0=>"fc5",
               16.0=>fa6,26.0=>fb6,36.0=>"fc6",
               17.0=>fa7,27.0=>fb7,37.0=>"fc7",
               18.0=>fa8,28.0=>fb8,38.0=>"fc8",
               19.0=>fa9,29.0=>fb9,39.0=>"fc9",

               #{ one => small, map => key } => "small map key 1",
               #{ second => small, map => key } => "small map key 2",
               #{ third => small, map => key } => "small map key 3",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 2" }),

    #{10:=a0,20:=b0,30:="c0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M4,
    #{11:=a1,21:=b1,31:="c1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M4,
    #{12:=a2,22:=b2,32:="c2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M4,
    #{13:=a3,23:=b3,33:="c3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M4,
    #{14:=a4,24:=b4,34:="c4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M4,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M4,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M4,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M4,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M4,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M4,

    #{ #{ one => small, map => key }    := "small map key 1",
       #{ second => small, map => key } := "small map key 2",
       #{ third => small, map => key }  := "small map key 3" } = M4,

    #{ #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
          11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
          12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
          13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
          14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

          15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
          16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
          17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
          18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
          19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } := "large map key 1",

       #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
          11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
          12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
          13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
          14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

          15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
          k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
          17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
          18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
          19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } := "large map key 2" } = M4,


    #{ 15:=V1,25:=b5,35:=V2,"45":="d5",<<"55">>:=V3,{["05"]}:="15",
       #{ one => small, map => key }    := "small map key 1",
       #{ second => small, map => key } := V4,
       #{ third => small, map => key }  := "small map key 3",
       #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
          11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
          12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
          13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
          14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

          15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
          16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
          17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
          18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
          19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } := V5 } = M4,

    a5   = V1,
    "c5" = V2,
    "e5" = V3,
    "small map key 2" = V4,
    "large map key 1" = V5,

    95 = map_size(M4),
    95 = maps:size(M4),

    % call for value

    M5 = id(#{ 10=>id(a0),20=>b0,30=>id("c0"),"40"=>"d0",<<"50">>=>id("e0"),{["00"]}=>"10",
               11=>id(a1),21=>b1,31=>id("c1"),"41"=>"d1",<<"51">>=>id("e1"),{["01"]}=>"11",
               12=>id(a2),22=>b2,32=>id("c2"),"42"=>"d2",<<"52">>=>id("e2"),{["02"]}=>"12",
               13=>id(a3),23=>b3,33=>id("c3"),"43"=>"d3",<<"53">>=>id("e3"),{["03"]}=>"13",
               14=>id(a4),24=>b4,34=>id("c4"),"44"=>"d4",<<"54">>=>id("e4"),{["04"]}=>"14",

               15=>id(a5),25=>b5,35=>id("c5"),"45"=>"d5",<<"55">>=>id("e5"),{["05"]}=>"15",
               16=>id(a6),26=>b6,36=>id("c6"),"46"=>"d6",<<"56">>=>id("e6"),{["06"]}=>"16",
               17=>id(a7),27=>b7,37=>id("c7"),"47"=>"d7",<<"57">>=>id("e7"),{["07"]}=>"17",
               18=>id(a8),28=>b8,38=>id("c8"),"48"=>"d8",<<"58">>=>id("e8"),{["08"]}=>"18",
               19=>id(a9),29=>b9,39=>id("c9"),"49"=>"d9",<<"59">>=>id("e9"),{["09"]}=>"19",

               10.0=>fa0,20.0=>id(fb0),30.0=>id("fc0"),
               11.0=>fa1,21.0=>id(fb1),31.0=>id("fc1"),
               12.0=>fa2,22.0=>id(fb2),32.0=>id("fc2"),
               13.0=>fa3,23.0=>id(fb3),33.0=>id("fc3"),
               14.0=>fa4,24.0=>id(fb4),34.0=>id("fc4"),

               15.0=>fa5,25.0=>id(fb5),35.0=>id("fc5"),
               16.0=>fa6,26.0=>id(fb6),36.0=>id("fc6"),
               17.0=>fa7,27.0=>id(fb7),37.0=>id("fc7"),
               18.0=>fa8,28.0=>id(fb8),38.0=>id("fc8"),
               19.0=>fa9,29.0=>id(fb9),39.0=>id("fc9"),

               #{ one => small, map => key } => id("small map key 1"),
               #{ second => small, map => key } => "small map key 2",
               #{ third => small, map => key } => "small map key 3",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => id("large map key 2") }),

    #{10:=a0,20:=b0,30:="c0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M5,
    #{11:=a1,21:=b1,31:="c1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M5,
    #{12:=a2,22:=b2,32:="c2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M5,
    #{13:=a3,23:=b3,33:="c3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M5,
    #{14:=a4,24:=b4,34:="c4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M5,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M5,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M5,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M5,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M5,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M5,

    #{ #{ one => small, map => key }    := "small map key 1",
       #{ second => small, map => key } := "small map key 2",
       #{ third => small, map => key }  := "small map key 3" } = M5,

    #{ #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
          11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
          12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
          13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
          14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

          15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
          16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
          17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
          18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
          19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } := "large map key 1",

       #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
          11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
          12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
          13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
          14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

          15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
          k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
          17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
          18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
          19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } := "large map key 2" } = M5,

    95 = map_size(M5),
    95 = maps:size(M5),

    %% remember

    #{10:=a0,20:=b0,30:="c0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M0,
    #{11:=a1,21:=b1,31:="c1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M0,
    #{12:=a2,22:=b2,32:="c2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M0,
    #{13:=a3,23:=b3,33:="c3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M0,
    #{14:=a4,24:=b4,34:="c4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M0,

    #{10:=na0,20:=nb0,30:="nc0","40":="nd0",<<"50">>:="ne0",{["00"]}:="n10"} = M1,
    #{11:=na1,21:=nb1,31:="nc1","41":="nd1",<<"51">>:="ne1",{["01"]}:="n11"} = M1,
    #{12:=na2,22:=nb2,32:="nc2","42":="nd2",<<"52">>:="ne2",{["02"]}:="n12"} = M1,
    #{13:=na3,23:=nb3,33:="nc3","43":="nd3",<<"53">>:="ne3",{["03"]}:="n13"} = M1,
    #{14:=na4,24:=nb4,34:="nc4","44":="nd4",<<"54">>:="ne4",{["04"]}:="n14"} = M1,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M1,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M1,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M1,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M1,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M1,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M2,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M2,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M2,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M2,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M2,

    #{10.0:=fa0,20.0:=fb0,30.0:="fc0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M2,
    #{11.0:=fa1,21.0:=fb1,31.0:="fc1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M2,
    #{12.0:=fa2,22.0:=fb2,32.0:="fc2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M2,
    #{13.0:=fa3,23.0:=fb3,33.0:="fc3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M2,
    #{14.0:=fa4,24.0:=fb4,34.0:="fc4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M2,

    #{15:=a5,25:=b5,35:="c5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M3,
    #{16:=a6,26:=b6,36:="c6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M3,
    #{17:=a7,27:=b7,37:="c7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M3,
    #{18:=a8,28:=b8,38:="c8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M3,
    #{19:=a9,29:=b9,39:="c9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M3,

    #{10.0:=fa0,20.0:=fb0,30.0:="fc0","40":="d0",<<"50">>:="e0",{["00"]}:="10"} = M3,
    #{11.0:=fa1,21.0:=fb1,31.0:="fc1","41":="d1",<<"51">>:="e1",{["01"]}:="11"} = M3,
    #{12.0:=fa2,22.0:=fb2,32.0:="fc2","42":="d2",<<"52">>:="e2",{["02"]}:="12"} = M3,
    #{13.0:=fa3,23.0:=fb3,33.0:="fc3","43":="d3",<<"53">>:="e3",{["03"]}:="13"} = M3,
    #{14.0:=fa4,24.0:=fb4,34.0:="fc4","44":="d4",<<"54">>:="e4",{["04"]}:="14"} = M3,

    #{15.0:=fa5,25.0:=fb5,35.0:="fc5","45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M3,
    #{16.0:=fa6,26.0:=fb6,36.0:="fc6","46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M3,
    #{17.0:=fa7,27.0:=fb7,37.0:="fc7","47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M3,
    #{18.0:=fa8,28.0:=fb8,38.0:="fc8","48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M3,
    #{19.0:=fa9,29.0:=fb9,39.0:="fc9","49":="d9",<<"59">>:="e9",{["09"]}:="19"} = M3,

    #{36893488147419103232:=big1,67108863:=big8,"45":="d5",<<"55">>:="e5",{["05"]}:="15"} = M3,
    #{147573952589676412928:=big3,8589934592:=big6,"46":="d6",<<"56">>:="e6",{["06"]}:="16"} = M3,
    #{4294967296:=big5,18446744073709551616:=big4,"47":="d7",<<"57">>:="e7",{["07"]}:="17"} = M3,
    #{4294967295:=big7,73786976294838206464:=big2,"48":="d8",<<"58">>:="e8",{["08"]}:="18"} = M3,

    ok.


t_build_and_match_aliasing(Config) when is_list(Config) ->
    M1 = id(#{a=>1,b=>2,c=>3,d=>4}),
    #{c:=C1=_=_=C2} = M1,
    true = C1 =:= C2,
    #{a:=A,a:=A,a:=A,b:=B,b:=B} = M1,
    #{a:=A,a:=A,a:=A,b:=B,b:=B,b:=2} = M1,
    #{a:=A=1,a:=A,a:=A,b:=B=2,b:=B,b:=2} = M1,
    #{c:=C1, c:=_, c:=3, c:=_, c:=C2} = M1,
    #{c:=C=_=3=_=C} = M1,

    M2 = id(#{"a"=>1,"b"=>2,"c"=>3,"d"=>4}),
    #{"a":=A2,"a":=A2,"a":=A2,"b":=B2,"b":=B2,"b":=2} = M2,
    #{"a":=_,"a":=_,"a":=_,"b":=_,"b":=_,"b":=2} = M2,

    #{a:=A1,a:=A1,a:=A1,b:=B1,b:=B1} = #{a:=A1,a:=A1,a:=A1,b:=B1,b:=B1,b:=2} = M1,
    #{"a":=A3,"b":=B3} = #{"a":=A3,"a":=A3} = #{"b":=B3,"b":=2} = M2,

    #{"a":=1,"b":=2,"c":=3,"d":=4} = #{"a":=A4,"b":=B4} = #{"a":=A4,"a":=A4} = #{"b":=B4,"d":=4} = M2,
    #{"a":=A5,"b":=B5} = #{"a":=A5,"a":=A5} = #{"b":=B5,"d":=4} = #{"a":=1,"b":=2,"c":=3,"d":=4} = M2,
    #{"a":=_,"b":=_} = #{"a":=_,"a":=_} = #{"b":=_,"d":=4} = #{"a":=1,"b":=2,"c":=3,"d":=4} = M2,

    M3 = id(#{<<12:300>>=>1,<<13:300>>=>2}),
    #{<<12:300>> := V1, <<13:300>> := V2} = #{<<13:300>> := V2, <<12:300>> := V1} = M3,
    #{<<12:300>> := 1, <<13:300>> := 2} = #{<<13:300>> := _, <<12:300>> := _} = M3,
    #{<<13:300>> := _, <<12:300>> := _} = #{<<12:300>> := 1, <<13:300>> := 2} = M3,

    ok.

t_map_size(Config) when is_list(Config) ->
    0 = map_size(id(#{})),
    1 = map_size(id(#{a=>1})),
    1 = map_size(id(#{a=>"wat"})),
    2 = map_size(id(#{a=>1, b=>2})),
    3 = map_size(id(#{a=>1, b=>2, b=>"3","33"=><<"n">>})),

    true = map_is_size(#{a=>1}, 1),
    true = map_is_size(#{a=>1, a=>2}, 1),
    M = #{ "a" => 1, "b" => 2},
    true  = map_is_size(M, 2),
    false = map_is_size(M, 3),
    true  = map_is_size(M#{ "a" => 2}, 2),
    false = map_is_size(M#{ "c" => 2}, 2),

    %% Error cases.
    {'EXIT',{{badmap,[]},_}} = (catch map_size([])),
    {'EXIT',{{badmap,<<1,2,3>>},_}} = (catch map_size(<<1,2,3>>)),
    {'EXIT',{{badmap,1},_}} = (catch map_size(1)),
    ok.

map_is_size(M,N) when map_size(M) =:= N -> true;
map_is_size(_,_) -> false.

t_is_map(Config) when is_list(Config) ->
    true = is_map(#{}),
    true = is_map(#{a=>1}),
    false = is_map({a,b}),
    false = is_map(x),
    if is_map(#{}) -> ok end,
    if is_map(#{b=>1}) -> ok end,
    if not is_map([1,2,3]) -> ok end,
    if not is_map(x) -> ok end,

    ok = do_t_is_map(map, #{}),
    error = do_t_is_map(map, {a,b,c}),
    ok = do_t_is_map(number, 42),
    ok = do_t_is_map(number, 42.0),
    error = do_t_is_map(number, {a,b,c}),
    ok.

do_t_is_map(What, X) ->
    B = case What of
            map ->
                %% Cover conversion of is_map/1 BIF to test instruction
                %% in beam_utils:bif_to_test/3.
                is_map(X);
            number ->
                is_number(X)
        end,
    case B of
        true -> ok;
        false -> error
    end.

% test map updates without matching
t_update_literals(Config) when is_list(Config) ->
    Map = #{x=>1,y=>2,z=>3,q=>4},
    #{x:="d",q:="4"} = loop_update_literals_x_q(Map, [
		{"a","1"},{"b","2"},{"c","3"},{"d","4"}
	]),
    ok.

t_update_literals_large(Config) when is_list(Config) ->
    Map = id(#{ 10=>id(a0),20=>b0,30=>id("c0"),"40"=>"d0",<<"50">>=>id("e0"),{["00"]}=>"10",
                11=>id(a1),21=>b1,31=>id("c1"),"41"=>"d1",<<"51">>=>id("e1"),{["01"]}=>"11",
                12=>id(a2),22=>b2,32=>id("c2"),"42"=>"d2",<<"52">>=>id("e2"),{["02"]}=>"12",
                13=>id(a3),23=>b3,33=>id("c3"),"43"=>"d3",<<"53">>=>id("e3"),{["03"]}=>"13",
                14=>id(a4),24=>b4,34=>id("c4"),"44"=>"d4",<<"54">>=>id("e4"),{["04"]}=>"14",

                15=>id(a5),25=>b5,35=>id("c5"),"45"=>"d5",<<"55">>=>id("e5"),{["05"]}=>"15",
                16=>id(a6),26=>b6,36=>id("c6"),"46"=>"d6",<<"56">>=>id("e6"),{["06"]}=>"16",
                17=>id(a7),27=>b7,37=>id("c7"),"47"=>"d7",<<"57">>=>id("e7"),{["07"]}=>"17",
                18=>id(a8),28=>b8,38=>id("c8"),"48"=>"d8",<<"58">>=>id("e8"),{["08"]}=>"18",
                19=>id(a9),29=>b9,39=>id("c9"),"49"=>"d9",<<"59">>=>id("e9"),{["09"]}=>"19",

                10.0=>fa0,20.0=>id(fb0),30.0=>id("fc0"),
                11.0=>fa1,21.0=>id(fb1),31.0=>id("fc1"),
                12.0=>fa2,22.0=>id(fb2),32.0=>id("fc2"),
                13.0=>fa3,23.0=>id(fb3),33.0=>id("fc3"),
                14.0=>fa4,24.0=>id(fb4),34.0=>id("fc4"),

                15.0=>fa5,25.0=>id(fb5),35.0=>id("fc5"),
                16.0=>fa6,26.0=>id(fb6),36.0=>id("fc6"),
                17.0=>fa7,27.0=>id(fb7),37.0=>id("fc7"),
                18.0=>fa8,28.0=>id(fb8),38.0=>id("fc8"),
                19.0=>fa9,29.0=>id(fb9),39.0=>id("fc9"),

                #{ one => small, map => key } => id("small map key 1"),
                #{ second => small, map => key } => "small map key 2",
                #{ third => small, map => key } => "small map key 3",

                #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                   11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                   12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                   13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                   14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                   15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                   16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                   17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                   18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                   19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

                #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                   11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                   12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                   13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                   14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                   15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                   k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                   17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                   18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                   19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => id("large map key 2") }),

    #{x:="d",q:="4"} = loop_update_literals_x_q(Map, [
		{"a","1"},{"b","2"},{"c","3"},{"d","4"}
	]),
    ok.



loop_update_literals_x_q(Map, []) -> Map;
loop_update_literals_x_q(Map, [{X,Q}|Vs]) ->
    loop_update_literals_x_q(Map#{q=>Q,x=>X},Vs).

% test map updates with matching
t_match_and_update_literals(Config) when is_list(Config) ->
    Map = #{ x=>0,y=>"untouched",z=>"also untouched",q=>1,
             #{ "one" => small, map => key } => "small map key 1" },
 
    #{x:=16,q:=21,y:="untouched",z:="also untouched"} = loop_match_and_update_literals_x_q(Map, [
	    {1,2},{3,4},{5,6},{7,8}
	]),
    M0 = id(#{ "hi" => "hello", int => 3, <<"key">> => <<"value">>,
	    4 => number, 18446744073709551629 => wat}),
    M1 = id(#{}),
    M2 = M1#{ "hi" => "hello", int => 3, <<"key">> => <<"value">>,
	4 => number, 18446744073709551629 => wat},
    M0 = M2,

    #{ 4 := another_number, int := 3 } = M2#{ 4 => another_number },
    ok.

t_match_and_update_literals_large(Config) when is_list(Config) ->
    Map = id(#{ 10=>id(a0),20=>b0,30=>id("c0"),"40"=>"d0",<<"50">>=>id("e0"),{["00"]}=>"10",
                11=>id(a1),21=>b1,31=>id("c1"),"41"=>"d1",<<"51">>=>id("e1"),{["01"]}=>"11",
                12=>id(a2),22=>b2,32=>id("c2"),"42"=>"d2",<<"52">>=>id("e2"),{["02"]}=>"12",
                13=>id(a3),23=>b3,33=>id("c3"),"43"=>"d3",<<"53">>=>id("e3"),{["03"]}=>"13",
                14=>id(a4),24=>b4,34=>id("c4"),"44"=>"d4",<<"54">>=>id("e4"),{["04"]}=>"14",

                15=>id(a5),25=>b5,35=>id("c5"),"45"=>"d5",<<"55">>=>id("e5"),{["05"]}=>"15",
                16=>id(a6),26=>b6,36=>id("c6"),"46"=>"d6",<<"56">>=>id("e6"),{["06"]}=>"16",
                17=>id(a7),27=>b7,37=>id("c7"),"47"=>"d7",<<"57">>=>id("e7"),{["07"]}=>"17",
                18=>id(a8),28=>b8,38=>id("c8"),"48"=>"d8",<<"58">>=>id("e8"),{["08"]}=>"18",
                19=>id(a9),29=>b9,39=>id("c9"),"49"=>"d9",<<"59">>=>id("e9"),{["09"]}=>"19",

                10.0=>fa0,20.0=>id(fb0),30.0=>id("fc0"),
                11.0=>fa1,21.0=>id(fb1),31.0=>id("fc1"),
                12.0=>fa2,22.0=>id(fb2),32.0=>id("fc2"),
                13.0=>fa3,23.0=>id(fb3),33.0=>id("fc3"),
                14.0=>fa4,24.0=>id(fb4),34.0=>id("fc4"),

                15.0=>fa5,25.0=>id(fb5),35.0=>id("fc5"),
                16.0=>fa6,26.0=>id(fb6),36.0=>id("fc6"),
                17.0=>fa7,27.0=>id(fb7),37.0=>id("fc7"),
                18.0=>fa8,28.0=>id(fb8),38.0=>id("fc8"),
                19.0=>fa9,29.0=>id(fb9),39.0=>id("fc9"),

                x=>0,y=>"untouched",z=>"also untouched",q=>1,

                #{ "one" => small, map => key } => id("small map key 1"),
                #{ second => small, map => key } => "small map key 2",
                #{ third => small, map => key } => "small map key 3",

                #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                   11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                   12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                   13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                   14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                   15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                   16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                   17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                   18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                   19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

                #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                   11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                   12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                   13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                   14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                   15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                   k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                   17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                   18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                   19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => id("large map key 2") }),

    #{x:=16,q:=21,y:="untouched",z:="also untouched"} = loop_match_and_update_literals_x_q(Map, [
	    {1,2},{3,4},{5,6},{7,8}
	]),
    M0 = id(Map#{ "hi" => "hello", int => 3, <<"key">> => <<"value">>,
                  4 => number, 18446744073709551629 => wat}),
    M1 = id(Map#{}),
    M2 = M1#{ "hi" => "hello", int => 3, <<"key">> => <<"value">>,
              4 => number, 18446744073709551629 => wat},
    M0 = M2,

    #{ 4 := another_number, int := 3 } = M2#{ 4 => another_number },
    ok.

loop_match_and_update_literals_x_q(Map, []) -> Map;
loop_match_and_update_literals_x_q(#{ q:=Q0, x:=X0,
                                     #{ "one" => small, map => key } := "small map key 1" } = Map, [{X,Q}|Vs]) ->
    loop_match_and_update_literals_x_q(Map#{q=>Q0+Q,x=>X0+X},Vs).


t_update_map_expressions(Config) when is_list(Config) ->
    M = maps:new(),
    X = id(fondue),
    M1 = #{ a := 1 } = M#{a => 1},
    #{ b := {X} } = M1#{ a := 1, b => {X} },

    #{ b := 2 } = (maps:new())#{ b => 2 },

    #{ a :=42, b:=42, c:=42 } = (maps:from_list([{a,1},{b,2},{c,3}]))#{ a := 42, b := 42, c := 42 },
    #{ "a" :=1, "b":=42, "c":=42 } = (maps:from_list([{"a",1},{"b",2}]))#{ "b" := 42, "c" => 42 },

    %% Test need to be in a fun.
    %% This tests that let expr optimisation in sys_core_fold
    %% covers maps correctly.
    F = fun() ->
	    M0 = id(#{ "a" => [1,2,3] }),
	    #{ "a" := _ } = M0,
	    M0#{ "a" := b }
    end,

    #{ "a" := b } = F(),

    %% Error cases.
    {'EXIT',{{badmap,<<>>},_}} = (catch (id(<<>>))#{ a := 42, b => 2 }),
    {'EXIT',{{badmap,[]},_}} = (catch (id([]))#{ a := 42, b => 2 }),
    {'EXIT',{{badmap,_},_}} =
	(catch (fun t_update_map_expressions/1)#{u => 42}),

    ok.


t_update_assoc(Config) when is_list(Config) ->
    M0 = id(#{1=>a,2=>b,3.0=>c,4=>d,5=>e}),

    M1 = M0#{1=>42,2=>100,4=>[a,b,c]},
    #{1:=42,2:=100,3.0:=c,4:=[a,b,c],5:=e} = M1,
    #{1:=42,2:=b,4:=d,5:=e,2.0:=100,3.0:=c,4.0:=[a,b,c]} = M0#{1.0=>float,1:=42,2.0=>wrong,2.0=>100,4.0=>[a,b,c]},

    M2 = M0#{3.0=>new},
    #{1:=a,2:=b,3.0:=new,4:=d,5:=e} = M2,
    M2 = M0#{3.0:=wrong,3.0=>new},

    % Can't handle directly yet
    Bin = <<0:257>>,
    #{ Bin := val } = id(M0#{<<0:257>> => val}), %% binary limitation

    %% Errors cases.
    BadMap = id(badmap),
    {'EXIT',{{badmap,BadMap},_}} = (catch BadMap#{nonexisting=>val}),
    {'EXIT',{{badmap,<<>>},_}} = (catch <<>>#{nonexisting=>val}),

    %% Evaluation order.
    {'EXIT',{blurf,_}} =
	(catch BadMap#{whatever=>id(error(blurf))}),
    {'EXIT',{blurf,_}} =
	(catch BadMap#{id(error(blurf))=>whatever}),
    ok.

t_update_assoc_large(Config) when is_list(Config) ->
    M0 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19",

               10.0=>fa0,20.0=>fb0,30.0=>"fc0",
               11.0=>fa1,21.0=>fb1,31.0=>"fc1",
               12.0=>fa2,22.0=>fb2,32.0=>"fc2",
               13.0=>fa3,23.0=>fb3,33.0=>"fc3",
               14.0=>fa4,24.0=>fb4,34.0=>"fc4",

               15.0=>fa5,25.0=>fb5,35.0=>"fc5",
               16.0=>fa6,26.0=>fb6,36.0=>"fc6",
               17.0=>fa7,27.0=>fb7,37.0=>"fc7",
               18.0=>fa8,28.0=>fb8,38.0=>"fc8",
               19.0=>fa9,29.0=>fb9,39.0=>"fc9",

               #{ one => small, map => key } => "small map key 1",
               #{ second => small, map => key } => "small map key 2",
               #{ third => small, map => key } => "small map key 3",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 2" }),


    M1 = M0#{1=>42,2=>100,4=>[a,b,c]},
    #{1:=42,2:=100,10.0:=fa0,4:=[a,b,c],25:=b5} = M1,
    #{ 10:=43, 24:=b4, 15:=a5, 35:="c5", 2.0:=100, 13.0:=fa3, 4.0:=[a,b,c]} =
        M0#{1.0=>float,10:=43,2.0=>wrong,2.0=>100,4.0=>[a,b,c]},

    M2 = M0#{13.0=>new},
    #{10:=a0,20:=b0,13.0:=new,"40":="d0",<<"50">>:="e0"} = M2,
    M2 = M0#{13.0:=wrong,13.0=>new},

    %% Errors cases.
    BadMap = id({no,map}),
    {'EXIT',{{badmap,BadMap},_}} = (catch BadMap#{nonexisting=>M0}),
    ok.



t_update_exact(Config) when is_list(Config) ->
    M0 = id(#{1=>a,2=>b,3.0=>c,4=>d,5=>e}),

    M1 = M0#{1:=42,2:=100,4:=[a,b,c]},
    #{1:=42,2:=100,3.0:=c,4:=[a,b,c],5:=e} = M1,
    M1 = M0#{1:=wrong,1=>42,2=>wrong,2:=100,4:=[a,b,c]},

    M2 = M0#{3.0:=new},
    #{1:=a,2:=b,3.0:=new,4:=d,5:=e} = M2,
    M2 = M0#{3.0=>wrong,3.0:=new},
    true = M2 =/= M0#{3=>right,3.0:=new},
    #{ 3 := right, 3.0 := new } = M0#{3=>right,3.0:=new},

    M3 = id(#{ 1 => val}),
    #{1 := update2,1.0 := new_val4} = M3#{
	1.0 => new_val1, 1 := update, 1=> update3,
	1 := update2, 1.0 := new_val2, 1.0 => new_val3,
	1.0 => new_val4 },

    %% Errors cases.
    {'EXIT',{{badmap,nil},_}} = (catch ((id(nil))#{ a := b })),
    {'EXIT',{{badkey,nonexisting},_}} = (catch M0#{nonexisting:=val}),
    {'EXIT',{{badkey,1.0},_}} = (catch M0#{1.0:=v,1.0=>v2}),
    {'EXIT',{{badkey,42},_}} = (catch M0#{42.0:=v,42:=v2}),
    {'EXIT',{{badkey,42.0},_}} = (catch M0#{42=>v1,42.0:=v2,42:=v3}),
    {'EXIT',{{badmap,<<>>},_}} = (catch <<>>#{nonexisting:=val}),
    {'EXIT',{{badkey,<<0:257>>},_}} =
	(catch M0#{<<0:257>> := val}),		%limitation

    %% A workaround for a bug allowed an empty map to be updated.
    {'EXIT',{{badkey,a},_}} = (catch (id(#{}))#{a:=1}),
    {'EXIT',{{badkey,a},_}} = (catch #{}#{a:=1}),
    Empty = #{},
    {'EXIT',{{badkey,a},_}} = (catch Empty#{a:=1}),

    %% Evaluation order.
    BadMap = id([no,map]),
    {'EXIT',{blurf,_}} =
	(catch BadMap#{whatever:=id(error(blurf))}),
    {'EXIT',{blurf,_}} =
	(catch BadMap#{id(error(blurf)):=whatever}),
    {'EXIT',{{badmap,BadMap},_}} =
	(catch BadMap#{id(nonexisting):=whatever}),
    ok.

t_update_exact_large(Config) when is_list(Config) ->
    M0 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19",

               10.0=>fa0,20.0=>fb0,30.0=>"fc0",
               11.0=>fa1,21.0=>fb1,31.0=>"fc1",
               12.0=>fa2,22.0=>fb2,32.0=>"fc2",
               13.0=>fa3,23.0=>fb3,33.0=>"fc3",
               14.0=>fa4,24.0=>fb4,34.0=>"fc4",

               15.0=>fa5,25.0=>fb5,35.0=>"fc5",
               16.0=>fa6,26.0=>fb6,36.0=>"fc6",
               17.0=>fa7,27.0=>fb7,37.0=>"fc7",
               18.0=>fa8,28.0=>fb8,38.0=>"fc8",
               19.0=>fa9,29.0=>fb9,39.0=>"fc9",

               #{ one => small, map => key } => "small map key 1",
               #{ second => small, map => key } => "small map key 2",
               #{ third => small, map => key } => "small map key 3",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 2" }),


    M1 = M0#{10:=42,<<"55">>:=100,10.0:=[a,b,c]},
    #{ 10:=42,<<"55">>:=100,{["05"]}:="15",10.0:=[a,b,c],
       #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
          11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
          12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
          13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
          14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

          15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
          16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
          17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
          18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
          19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } := "large map key 1" } = M1,

    M1 = M0#{10:=wrong,10=>42,<<"55">>=>wrong,<<"55">>:=100,10.0:=[a,b,c]},

    M2 = M0#{13.0:=new},
    #{10:=a0,20:=b0,13.0:=new} = M2,
    M2 = M0#{13.0=>wrong,13.0:=new},

    %% Errors cases.
    {'EXIT',{{badkey,nonexisting},_}} = (catch M0#{nonexisting:=val}),
    {'EXIT',{{badkey,1.0},_}} = (catch M0#{1.0:=v,1.0=>v2}),
    {'EXIT',{{badkey,42},_}} = (catch M0#{42.0:=v,42:=v2}),
    {'EXIT',{{badkey,42.0},_}} = (catch M0#{42=>v1,42.0:=v2,42:=v3}),

    ok.

t_update_values(Config) when is_list(Config) ->
    V0 = id(1337),
    M0 = #{ a => 1, val => V0},
    V1 = get_val(M0),
    M1 = id(M0#{ val := [V0,V1], "wazzup" => 42 }),
    [1337, {some_val, 1337}] = get_val(M1),
    M2 = id(M1#{ <<42:333>> => 1337 }),
    {bin_key,1337} = get_val(M2),

    N = 110,
    List = [{[I,1,2,3,I],{1,2,3,"wat",I}}|| I <- lists:seq(1,N)],

    {_,_,#{val2 := {1,2,3,"wat",N}, val1 := [N,1,2,3,N]}} = lists:foldl(fun
	    ({V2,V3},{Old2,Old3,Mi}) ->
		ok = check_val(Mi,Old2,Old3),
		#{ val1 := Old2, val2 := Old3 } = Mi,
		{V2,V3, Mi#{ val1 := id(V2), val2 := V1, val2 => id(V3)}}
	end, {none, none, #{val1=>none,val2=>none}},List),
    ok.

t_expand_map_update(Config) when is_list(Config) ->
    M = #{<<"hello">> => <<"world">>}#{<<"hello">> := <<"les gens">>},
    #{<<"hello">> := <<"les gens">>} = M,
    ok.

t_export(Config) when is_list(Config) ->
    Raclette = id(#{}),
    case brie of brie -> Fromage = Raclette end,
    Raclette = Fromage#{},
    ok.

check_val(#{val1:=V1, val2:=V2},V1,V2) -> ok.

get_val(#{ <<42:333>> := V }) -> {bin_key, V};
get_val(#{ "wazzup" := _, val := V}) -> V;
get_val(#{ val := V }) -> {some_val, V}.

t_guard_bifs(Config) when is_list(Config) ->
    true   = map_guard_empty(),
    true   = map_guard_empty_2(),
    true   = map_guard_head(#{a=>1}),
    false  = map_guard_head([]),
    true   = map_guard_body(#{a=>1}),
    false  = map_guard_body({}),
    true   = map_guard_pattern(#{a=>1, <<"hi">> => "hi" }),
    false  = map_guard_pattern("list"),
    true   = map_guard_tautology(),
    true   = map_guard_ill_map_size(),
    ok.

map_guard_empty() when is_map(#{}); false -> true.

map_guard_empty_2() when true; #{} andalso false -> true.

map_guard_head(M) when is_map(M) -> true;
map_guard_head(_) -> false.

map_guard_body(M) -> is_map(M).

map_guard_pattern(#{}) -> true;
map_guard_pattern(_)   -> false.

map_guard_tautology() when #{} =:= #{}; true -> true.

map_guard_ill_map_size() when true; map_size(0) -> true.

t_guard_sequence(Config) when is_list(Config) ->
	{1, "a"} = map_guard_sequence_1(#{seq=>1,val=>id("a")}),
	{2, "b"} = map_guard_sequence_1(#{seq=>2,val=>id("b")}),
	{3, "c"} = map_guard_sequence_1(#{seq=>3,val=>id("c")}),
	{4, "d"} = map_guard_sequence_1(#{seq=>4,val=>id("d")}),
	{5, "e"} = map_guard_sequence_1(#{seq=>5,val=>id("e")}),

	{1,M1}       = map_guard_sequence_2(M1 = id(#{a=>3})),
	{2,M2}       = map_guard_sequence_2(M2 = id(#{a=>4, b=>4})),
	{3,gg,M3}    = map_guard_sequence_2(M3 = id(#{a=>gg, b=>4})),
	{4,sc,sc,M4} = map_guard_sequence_2(M4 = id(#{a=>sc, b=>3, c=>sc2})),
	{5,kk,kk,M5} = map_guard_sequence_2(M5 = id(#{a=>kk, b=>other, c=>sc2})),
	
	%% error case
	{'EXIT',{function_clause,_}} = (catch map_guard_sequence_1(#{seq=>6,val=>id("e")})),
	{'EXIT',{function_clause,_}} = (catch map_guard_sequence_2(#{b=>5})),
	ok.

t_guard_sequence_large(Config) when is_list(Config) ->
    M0 = id(#{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00",03]}=>"10",
               11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01",03]}=>"11",
               12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02",03]}=>"12",
               13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03",03]}=>"13",
               14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04",03]}=>"14",

               15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05",03]}=>"15",
               16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06",03]}=>"16",
               17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07",03]}=>"17",
               18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08",03]}=>"18",
               19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09",03]}=>"19",

               10.0=>fa0,20.0=>fb0,30.0=>"fc0",
               11.0=>fa1,21.0=>fb1,31.0=>"fc1",
               12.0=>fa2,22.0=>fb2,32.0=>"fc2",
               13.0=>fa3,23.0=>fb3,33.0=>"fc3",
               14.0=>fa4,24.0=>fb4,34.0=>"fc4",

               15.0=>fa5,25.0=>fb5,35.0=>"fc5",
               16.0=>fa6,26.0=>fb6,36.0=>"fc6",
               17.0=>fa7,27.0=>fb7,37.0=>"fc7",
               18.0=>fa8,28.0=>fb8,38.0=>"fc8",
               19.0=>fa9,29.0=>fb9,39.0=>"fc9",

               #{ one => small, map => key } => "small map key 1",
               #{ second => small, map => key } => "small map key 2",
               #{ third => small, map => key } => "small map key 3",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 2" }),

	{1, "a"} = map_guard_sequence_1(M0#{seq=>1,val=>id("a")}),
	{2, "b"} = map_guard_sequence_1(M0#{seq=>2,val=>id("b")}),
	{3, "c"} = map_guard_sequence_1(M0#{seq=>3,val=>id("c")}),
	{4, "d"} = map_guard_sequence_1(M0#{seq=>4,val=>id("d")}),
	{5, "e"} = map_guard_sequence_1(M0#{seq=>5,val=>id("e")}),

	{1,M1}       = map_guard_sequence_2(M1 = id(M0#{a=>3})),
	{2,M2}       = map_guard_sequence_2(M2 = id(M0#{a=>4, b=>4})),
	{3,gg,M3}    = map_guard_sequence_2(M3 = id(M0#{a=>gg, b=>4})),
	{4,sc,sc,M4} = map_guard_sequence_2(M4 = id(M0#{a=>sc, b=>3, c=>sc2})),
	{5,kk,kk,M5} = map_guard_sequence_2(M5 = id(M0#{a=>kk, b=>other, c=>sc2})),

	{'EXIT',{function_clause,_}} = (catch map_guard_sequence_1(M0#{seq=>6,val=>id("e")})),
	{'EXIT',{function_clause,_}} = (catch map_guard_sequence_2(M0#{b=>5})),
        ok.

map_guard_sequence_1(#{seq:=1=Seq, val:=Val}) -> {Seq,Val};
map_guard_sequence_1(#{seq:=2=Seq, val:=Val}) -> {Seq,Val};
map_guard_sequence_1(#{seq:=3=Seq, val:=Val}) -> {Seq,Val};
map_guard_sequence_1(#{seq:=4=Seq, val:=Val}) -> {Seq,Val};
map_guard_sequence_1(#{seq:=5=Seq, val:=Val}) -> {Seq,Val}.

map_guard_sequence_2(#{ a:=3 }=M) -> {1, M};
map_guard_sequence_2(#{ a:=4 }=M) -> {2, M};
map_guard_sequence_2(#{ a:=X, a:=X, b:=4 }=M) -> {3,X,M};
map_guard_sequence_2(#{ a:=X, a:=Y, b:=3 }=M) when X =:= Y -> {4,X,Y,M};
map_guard_sequence_2(#{ a:=X, a:=Y }=M) when X =:= Y -> {5,X,Y,M}.


t_guard_update(Config) when is_list(Config) ->
    error  = map_guard_update(#{},#{}),
    first  = map_guard_update(#{}, #{x=>first}),
    second = map_guard_update(#{y=>old}, #{x=>second,y=>old}),
    third  = map_guard_update(#{x=>old,y=>old}, #{x=>third,y=>old}),
    bad_map_guard_update(),
    ok.

t_guard_update_large(Config) when is_list(Config) ->
    M0 = id(#{ 70=>a0,80=>b0,90=>"c0","40"=>"d0",<<"50">>=>"e0",{["00",03]}=>"10",
               71=>a1,81=>b1,91=>"c1","41"=>"d1",<<"51">>=>"e1",{["01",03]}=>"11",
               72=>a2,82=>b2,92=>"c2","42"=>"d2",<<"52">>=>"e2",{["02",03]}=>"12",
               73=>a3,83=>b3,93=>"c3","43"=>"d3",<<"53">>=>"e3",{["03",03]}=>"13",
               74=>a4,84=>b4,94=>"c4","44"=>"d4",<<"54">>=>"e4",{["04",03]}=>"14",

               75=>a5,85=>b5,95=>"c5","45"=>"d5",<<"55">>=>"e5",{["05",03]}=>"15",
               76=>a6,86=>b6,96=>"c6","46"=>"d6",<<"56">>=>"e6",{["06",03]}=>"16",
               77=>a7,87=>b7,97=>"c7","47"=>"d7",<<"57">>=>"e7",{["07",03]}=>"17",
               78=>a8,88=>b8,98=>"c8","48"=>"d8",<<"58">>=>"e8",{["08",03]}=>"18",
               79=>a9,89=>b9,99=>"c9","49"=>"d9",<<"59">>=>"e9",{["09",03]}=>"19",

               70.0=>fa0,80.0=>fb0,90.0=>"fc0",
               71.0=>fa1,81.0=>fb1,91.0=>"fc1",
               72.0=>fa2,82.0=>fb2,92.0=>"fc2",
               73.0=>fa3,83.0=>fb3,93.0=>"fc3",
               74.0=>fa4,84.0=>fb4,94.0=>"fc4",

               75.0=>fa5,85.0=>fb5,95.0=>"fc5",
               76.0=>fa6,86.0=>fb6,96.0=>"fc6",
               77.0=>fa7,87.0=>fb7,97.0=>"fc7",
               78.0=>fa8,88.0=>fb8,98.0=>"fc8",
               79.0=>fa9,89.0=>fb9,99.0=>"fc9",

               #{ one => small, map => key } => "small map key 1",
               #{ second => small, map => key } => "small map key 2",
               #{ third => small, map => key } => "small map key 3",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  16=>a6,26=>b6,36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 1",

               #{ 10=>a0,20=>b0,30=>"c0","40"=>"d0",<<"50">>=>"e0",{["00"]}=>"10",
                  11=>a1,21=>b1,31=>"c1","41"=>"d1",<<"51">>=>"e1",{["01"]}=>"11",
                  12=>a2,22=>b2,32=>"c2","42"=>"d2",<<"52">>=>"e2",{["02"]}=>"12",
                  13=>a3,23=>b3,33=>"c3","43"=>"d3",<<"53">>=>"e3",{["03"]}=>"13",
                  14=>a4,24=>b4,34=>"c4","44"=>"d4",<<"54">>=>"e4",{["04"]}=>"14",

                  15=>a5,25=>b5,35=>"c5","45"=>"d5",<<"55">>=>"e5",{["05"]}=>"15",
                  k16=>a6,k26=>b6,k36=>"c6","46"=>"d6",<<"56">>=>"e6",{["06"]}=>"16",
                  17=>a7,27=>b7,37=>"c7","47"=>"d7",<<"57">>=>"e7",{["07"]}=>"17",
                  18=>a8,28=>b8,38=>"c8","48"=>"d8",<<"58">>=>"e8",{["08"]}=>"18",
                  19=>a9,29=>b9,39=>"c9","49"=>"d9",<<"59">>=>"e9",{["09"]}=>"19" } => "large map key 2" }),


    error  = map_guard_update(M0#{},M0#{}),
    first  = map_guard_update(M0#{},M0#{x=>first}),
    second = map_guard_update(M0#{y=>old}, M0#{x=>second,y=>old}),
    ok.

map_guard_update(M1, M2) when M1#{x=>first}  =:= M2 -> first;
map_guard_update(M1, M2) when M1#{x=>second} =:= M2 -> second;
map_guard_update(M1, M2) when M1#{x:=third}  =:= M2 -> third;
map_guard_update(_, _) -> error.

bad_map_guard_update() ->
    do_bad_map_guard_update(fun burns/1),
    do_bad_map_guard_update(fun turns/1),
    ok.

do_bad_map_guard_update(Fun) ->
    do_bad_map_guard_update_1(Fun, #{}),
    do_bad_map_guard_update_1(Fun, #{true=>1}),
    ok.

do_bad_map_guard_update_1(Fun, Value) ->
    %% Note: The business with the seemingly redundant fun
    %% disables inlining, which would otherwise change the
    %% EXIT reason.
    {'EXIT',{function_clause,_}} = (catch Fun(Value)),
    ok.

burns(Richmond) when not (Richmond#{true := 0}); [Richmond] ->
    specification.

turns(Richmond) when not (Richmond#{true => 0}); [Richmond] ->
    specification.

t_guard_receive(Config) when is_list(Config) ->
    M0  = #{ id => 0 },
    Pid = spawn_link(fun() -> guard_receive_loop() end),
    Big = 36893488147419103229,
    B1  = <<"some text">>,
    B2  = <<"was appended">>,
    B3  = <<B1/binary, B2/binary>>,

    #{id:=1, res:=Big} = M1 = call(Pid, M0#{op=>sub,in=>{1 bsl 65, 3}}),
    #{id:=2, res:=26}  = M2 = call(Pid, M1#{op=>idiv,in=>{53,2}}),
    #{id:=3, res:=832} = M3 = call(Pid, M2#{op=>imul,in=>{26,32}}),
    #{id:=4, res:=4}   = M4 = call(Pid, M3#{op=>add,in=>{1,3}}),
    #{id:=5, res:=Big} = M5 = call(Pid, M4#{op=>sub,in=>{1 bsl 65, 3}}),
    #{id:=6, res:=B3}  = M6 = call(Pid, M5#{op=>"append",in=>{B1,B2}}),
    #{id:=7, res:=4}   = _  = call(Pid, M6#{op=>add,in=>{1,3}}),


    %% update old maps and check id update
    #{id:=2, res:=B3} = call(Pid, M1#{op=>"append",in=>{B1,B2}}),
    #{id:=5, res:=99} = call(Pid, M4#{op=>add,in=>{33, 66}}),

    %% cleanup
    done = call(Pid, done),
    ok.

-define(t_guard_receive_large_procs, 1500).

t_guard_receive_large(Config) when is_list(Config) ->
    M = lists:foldl(fun(_,#{procs := Ps } = M) ->
                            M#{ procs := Ps#{ spawn_link(fun() -> grecv_loop() end) => 0 }}
                    end, #{procs => #{}, done => 0}, lists:seq(1,?t_guard_receive_large_procs)),
    lists:foreach(fun(Pid) ->
                          Pid ! {self(), hello}
                  end, maps:keys(maps:get(procs,M))),
    ok = guard_receive_large_loop(M),
    ok.

guard_receive_large_loop(#{done := ?t_guard_receive_large_procs}) ->
    ok;
guard_receive_large_loop(M) ->
    receive
        #{pid := Pid, msg := hello} ->
            case M of
                #{done := Count, procs := #{Pid := 150}} ->
                    Pid ! {self(), done},
                    guard_receive_large_loop(M#{done := Count + 1});
                #{procs := #{Pid := Count} = Ps} ->
                    Pid ! {self(), hello},
                    guard_receive_large_loop(M#{procs := Ps#{Pid := Count + 1}})
            end
    end.

grecv_loop() ->
    receive
        {_, done} ->
            ok;
        {Pid, hello} ->
            Pid ! #{pid=>self(), msg=>hello},
            grecv_loop()
    end.


call(Pid, M) ->
    Pid ! {self(), M}, receive {Pid, Res} -> Res end.

guard_receive_loop() ->
    receive
	{Pid, #{ id:=Id, op:="append", in:={X,Y}}=M} when is_binary(X), is_binary(Y) ->
	    Pid ! {self(), M#{ id=>Id+1, res=><<X/binary,Y/binary>>}},
	    guard_receive_loop();
	{Pid, #{ id:=Id, op:=add, in:={X,Y}}} ->
	    Pid ! {self(), #{ id=>Id+1, res=>X+Y}},
	    guard_receive_loop();
	{Pid, #{ id:=Id, op:=sub,  in:={X,Y}}=M} ->
	    Pid ! {self(), M#{ id=>Id+1, res=>X-Y}},
	    guard_receive_loop();
	{Pid, #{ id:=Id, op:=idiv, in:={X,Y}}=M} ->
	    Pid ! {self(), M#{ id=>Id+1, res=>X div Y}},
	    guard_receive_loop();
	{Pid, #{ id:=Id, op:=imul, in:={X,Y}}=M} ->
	    Pid ! {self(), M#{ id=>Id+1, res=>X * Y}},
	    guard_receive_loop();
	{Pid, done} ->
	    Pid ! {self(), done};
	{Pid, Other} ->
	    Pid ! {error, Other},
	    guard_receive_loop()
    end.


t_list_comprehension(Config) when is_list(Config) ->
    [#{k:=1},#{k:=2},#{k:=3}] = id([#{k=>I} || I <- [1,2,3]]),
    Ls = id([#{<<2:301>> => I, "wat" => I + 1} || I <- [1,2,3]]),
    [#{<<2:301>>:=1,"wat":=2},#{<<2:301>>:=2,"wat":=3},#{<<2:301>>:=3,"wat":=4}] = Ls,
    [{1,2},{2,3},{3,4}] = id([{I2,I1} || #{"wat" := I1, <<2:301>> := I2} <- Ls]),

    Ks = lists:seq($a,$z),
    Ms = [#{[K1,K2]=>{K1,K2}} || K1 <- Ks, K2 <- Ks],
    [#{"aa" := {$a,$a}},#{"ab":={$a,$b}}|_] = Ms,
    [#{"zz" := {$z,$z}},#{"zy":={$z,$y}}|_] = lists:reverse(Ms),
    ok.

t_guard_fun(Config) when is_list(Config) ->
    F1 = fun
	    (#{s:=v,v:=V})     -> {v,V};
	    (#{s:=t,v:={V,V}}) -> {t,V};
	    (#{s:=l,v:=[V,V]}) -> {l,V}
    end,
    
    F2 = fun
	    (#{s:=T,v:={V,V}}) -> {T,V};
	    (#{s:=T,v:=[V,V]}) -> {T,V};
	    (#{s:=T,v:=V})     -> {T,V}
    end,
    V = <<"hi">>,

    {v,V} = F1(#{s=>v,v=>V}),
    {t,V} = F1(#{s=>t,v=>{V,V}}),
    {l,V} = F1(#{s=>l,v=>[V,V]}),

    {v,V} = F2(#{s=>v,v=>V}),
    {t,V} = F2(#{s=>t,v=>{V,V}}),
    {l,V} = F2(#{s=>l,v=>[V,V]}),

    %% error case
    case (catch F1(#{s=>none,v=>none})) of
	{'EXIT', {function_clause,[{?MODULE,_,[#{s:=none,v:=none}],_}|_]}} -> ok;
	{'EXIT', {{case_clause,_},_}} -> {comment,inlined};
	Other ->
	    ct:fail({no_match, Other})
    end.


t_map_sort_literals(Config) when is_list(Config) ->
    % test relation

    %% size order
    true  = #{ a => 1, b => 2} < id(#{ a => 1, b => 1, c => 1}),
    true  = #{ b => 1, a => 1} < id(#{ c => 1, a => 1, b => 1}),
    false = #{ c => 1, b => 1, a => 1} < id(#{ c => 1, a => 1}),

    %% key order
    true  = id(#{ a => 1 }) < id(#{ b => 1}),
    false = id(#{ b => 1 }) < id(#{ a => 1}),
    true  = id(#{ a => 1, b => 1, c => 1 }) < id(#{ b => 1, c => 1, d => 1}),
    true  = id(#{ b => 1, c => 1, d => 1 }) > id(#{ a => 1, b => 1, c => 1}),
    true  = id(#{ c => 1, b => 1, a => 1 }) < id(#{ b => 1, c => 1, d => 1}),
    true  = id(#{ "a" => 1 }) < id(#{ <<"a">> => 1}),
    false = id(#{ <<"a">> => 1 }) < id(#{ "a" => 1}),
    true = id(#{ 1 => 1 }) < id(#{ 1.0 => 1}),
    false = id(#{ 1.0 => 1 }) < id(#{ 1 => 1}),

    %% value order
    true  = id(#{ a => 1 }) < id(#{ a => 2}),
    false = id(#{ a => 2 }) < id(#{ a => 1}),
    false = id(#{ a => 2, b => 1 }) < id(#{ a => 1, b => 3}),
    true  = id(#{ a => 1, b => 1 }) < id(#{ a => 1, b => 3}),

    true  = id(#{ "a" => "hi", b => 134 }) == id(#{ b => 134,"a" => "hi"}),

    %% lists:sort

    SortVs = [#{"a"=>1},#{a=>2},#{1=>3},#{<<"a">>=>4}],
    [#{1:=ok},#{a:=ok},#{"a":=ok},#{<<"a">>:=ok}] = lists:sort([#{"a"=>ok},#{a=>ok},#{1=>ok},#{<<"a">>=>ok}]),
    [#{1:=3},#{a:=2},#{"a":=1},#{<<"a">>:=4}] = lists:sort(SortVs),
    [#{1:=3},#{a:=2},#{"a":=1},#{<<"a">>:=4}] = lists:sort(lists:reverse(SortVs)),

    ok.

t_warn_pair_key_overloaded(Config) when is_list(Config) ->
    #{ "hi1" := 42 } = id(#{ "hi1" => 1, "hi1" => 42 }),

    #{ "hi1" := 1337, "hi2" := [2], "hi3" := 3 } = id(#{
	    "hi1" => erlang:atom_to_binary(?MODULE,utf8),
	    "hi1" => erlang:binary_to_atom(<<"wazzup">>,utf8),
	    "hi1" => erlang:binary_to_float(<<"3.1416">>),
	    "hi1" => erlang:float_to_binary(3.1416),
	    "hi2" => erlang:pid_to_list(self()),
	    "hi3" => erlang:float_to_binary(3.1416),
	    "hi2" => lists:subtract([1,2],[1]),
	    "hi3" => +3,
	    "hi1" => erlang:min(1,2),
	    "hi1" => erlang:phash({1,2},33),
	    "hi1" => erlang:phash2({1,2},34),
	    "hi1" => erlang:integer_to_binary(1337),
	    "hi1" => erlang:binary_to_integer(<<"1337">>),
	    "hi4" => erlang:float_to_binary(3.1416)
	}),
    ok.

t_warn_useless_build(Config) when is_list(Config) ->
    [#{ a => id(I)} || I <- [1,2,3]],
    ok.

t_build_and_match_over_alloc(Config) when is_list(Config) ->
    Ls = id([1,2,3]),
    V0 = [a|Ls],
    M0 = id(#{ "a" => V0 }),
    #{ "a" := V1 } = M0,
    V2 = id([c|Ls]),
    M2 = id(#{ "a" => V2 }),
    #{ "a" := V3 } = M2,
    {[a,1,2,3],[c,1,2,3]} = id({V1,V3}),
    ok.

t_build_and_match_empty_val(Config) when is_list(Config) ->
    F = fun(#{ "hi":=_,{1,2}:=_,1337:=_}) -> ok end,
    ok = F(id(#{"hi"=>ok,{1,2}=>ok,1337=>ok})),

    %% error case
    case (catch (F(id(#{"hi"=>ok})))) of
	{'EXIT',{function_clause,_}} -> ok;
	{'EXIT', {{case_clause,_},_}} -> {comment,inlined};
	Other ->
	    ct:fail({no_match, Other})
    end.

t_build_and_match_val(Config) when is_list(Config) ->
    F = fun
	(#{ "hi" := first,  v := V}) -> {1,V};
	(#{ "hi" := second, v := V}) -> {2,V}
    end,


    {1,"hello"}  = F(id(#{"hi"=>first,v=>"hello"})),
    {2,"second"} = F(id(#{"hi"=>second,v=>"second"})),

    %% error case
    case (catch (F(id(#{"hi"=>ok})))) of
	{'EXIT',{function_clause,_}} -> ok;
	{'EXIT', {{case_clause,_},_}} -> {comment,inlined};
	Other ->
	    ct:fail({no_match, Other})
    end.

t_build_and_match_nil(Config) when is_list(Config) ->
    %% literals removed the coverage
    V1 = id(cookie),
    V2 = id(cake),
    V3 = id(crisps),

    #{ [] := V1, "treat" := V2, {your,treat} := V3 } = id(#{
	    {your,treat} => V3,
	    "treat" => V2, 
	    [] => V1 }),
    #{ [] := V3, [] := V3 } = id(#{ [] => V1, [] => V3 }),
    #{ <<1>> := V3, [] := V1 } = id(#{ [] => V1, <<1>> => V3 }),
    ok.

t_build_and_match_structure(Config) when is_list(Config) ->
    V2 = id("it"),
    S = id([42,{"hi", "=)", #{ "a" => 42, any => any, val => "get_" ++ V2}}]),

    %% match deep map values
    V2 = case S of
	[42,{"hi",_, #{ "a" := 42, val := "get_" ++ V1, any := _ }}] -> V1
    end,
    %% match deep map
    ok = case S of
	[42,{"hi",_, #{ }}] -> ok
    end,
    ok.

%% simple build and match variables
t_build_and_match_variables(Config) when is_list(Config) ->
    K0 = id(#{}),
    K1 = id(1),       V1 = id(a),
    K2 = id(2),       V2 = id(b),
    K3 = id(3),       V3 = id("c"),
    K4 = id("4"),     V4 = id("d"),
    K5 = id(<<"5">>), V5 = id(<<"e">>),
    K6 = id({"6",7}), V6 = id("f"),
    K7 = id(#{ "a" => 3 }),
    #{K1:=V1} = id(#{K1=>V1}),
    #{K1:=V1,K2:=V2} = id(#{K1=>V1,K2=>V2}),
    #{K1:=V1,K2:=V2,K3:=V3} = id(#{K1=>V1,K2=>V2,K3=>V3}),
    #{K1:=V1,K2:=V2,K3:=V3,K4:=V4} = id(#{K1=>V1,K2=>V2,K3=>V3,K4=>V4}),
    #{K1:=V1,K2:=V2,K3:=V3,K4:=V4,K5:=V5} = id(#{K1=>V1,K2=>V2,K3=>V3,K4=>V4,K5=>V5}),
    #{K1:=V1,K2:=V2,K3:=V3,K4:=V4,K5:=V5,K6:=V6} = id(#{K1=>V1,K2=>V2,K3=>V3,K4=>V4,K5=>V5,K6=>V6}),

    #{K5:=X,K5:=X=3,K4:=4} = id(#{K5=>3,K4=>4}),
    #{K5:=X,<<"5">>:=X=3,K4:=4} = id(#{K5=>3,K4=>4}),
    #{K5:=X,<<"5">>:=X=3,K4:=4} = id(#{<<"5">>=>3,K4=>4}),

    #{ K4:=#{ K3:=#{K1:=V1, K2:=V2}}, K5:=V5} =
	id(#{ K5=>V5, K4=>#{ K3=>#{K2 => V2, K1 => V1}}}),
    #{ K4 := #{ K5 := Res }, K6 := Res} = id(#{K4=>#{K5 => 99}, K6 => 99}),

    %% has keys
    #{a :=_,b :=_,K1:=_,K2:=_,K3:=V3,K4:=ResKey,K4:=ResKey,"4":=ResKey,"4":="ok"} =
	id(#{ a=>1, b=>1, K1=>V1, K2=>V2, K3=>V3, K4=>"nope", "4"=>"ok" }),

    %% function
    ok = match_function_map_neg_keys(#{ -1 => a, -2 => b, -3 => c }),

    %% map key
    #{ K0 := 42 } = id(#{ K0 => 42 }),
    #{ K7 := 42 } = id(#{ K7 => 42 }),

    %% nil key
    KNIL = id([]),
    #{KNIL:=ok,1:=2} = id(#{KNIL=>ok,1=>2}),

    Bin = <<0:258>>,
    #{ Bin := "three" } = id(#{<<0:258>> =>"three"}),

    %% error case
    {'EXIT',{{badmatch,_},_}} = (catch (#{K5:=3,x:=2} = id(#{K5=>3}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{K5:=2} = id(#{K5=>3}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{K5:=3} = id({a,b,c}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{K5:=3} = id(#{K6=>3}))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{K5:=3} = id(K7))),
    {'EXIT',{{badmatch,_},_}} = (catch (#{K7:=3} = id(#{K7=>42}))),
    ok.


match_function_map_neg_keys(#{ -1 := a, -2 := b, -3 := c }) -> ok.

t_update_assoc_variables(Config) when is_list(Config) ->
    K1 = id(1),
    K2 = id(2),
    K3 = id(3.0),
    K4 = id(4),
    K5 = id(5),
    K6 = id(2.0),

    M0 = #{K1=>a,K2=>b,K3=>c,K4=>d,K5=>e},

    M1 = M0#{K1=>42,K2=>100,K4=>[a,b,c]},
    #{1:=42,2:=100,3.0:=c,4:=[a,b,c],5:=e} = M1,
    #{1:=42,2:=b,4:=d,5:=e,2.0:=100,K3:=c,4.0:=[a,b,c]} = M0#{1.0=>float,1:=42,2.0=>wrong,K6=>100,4.0=>[a,b,c]},

    M2 = M0#{K3=>new},
    #{1:=a,2:=b,K3:=new,4:=d,5:=e} = M2,
    M2 = M0#{3.0:=wrong,K3=>new},

    #{ <<0:258>> := val } = id(M0#{<<0:258>> => val}), %% binary limitation

    %% Errors cases.
    BadMap = id(badmap),
    {'EXIT',{{badmap,BadMap},_}} = (catch BadMap#{nonexisting=>val}),
    {'EXIT',{{badmap,<<>>},_}} = (catch <<>>#{nonexisting=>val}),
    ok.

t_update_exact_variables(Config) when is_list(Config) ->
    K1 = id(1),
    K2 = id(2),
    K3 = id(3.0),
    K4 = id(4),

    M0 = id(#{1=>a,2=>b,3.0=>c,4=>d,5=>e}),

    M1 = M0#{K1:=42,K2:=100,K4:=[a,b,c]},
    #{1:=42,2:=100,3.0:=c,K4:=[a,b,c],5:=e} = M1,
    M1 = M0#{K1:=wrong,1:=also_wrong,K1=>42,2=>wrong,K2:=100,4:=[a,b,c]},

    M2 = M0#{K3:=new},
    #{1:=a,K2:=b,3.0:=new,K4:=d,5:=e} = M2,
    M2 = M0#{3.0=>wrong,K3:=new},
    true = M2 =/= M0#{3=>right,3.0:=new},
    #{ 3 := right, 3.0 := new } = M0#{3=>right,K3:=new},

    M3 = id(#{ 1 => val}),
    #{1 := update2,1.0 := new_val4} = M3#{
	1.0 => new_val1, K1 := update, K1=> update3,
	K1 := update2, 1.0 := new_val2, 1.0 => new_val3,
	1.0 => new_val4 },

    #{ "wat" := 3, 2 := a } = id(#{ "wat" => 1, K2 => 2 }#{ K2 := a, "wat" := 3 }),

    %% Errors cases.
    {'EXIT',{{badmap,nil},_}} = (catch ((id(nil))#{ a := b })),
    {'EXIT',{{badkey,nonexisting},_}} = (catch M0#{nonexisting:=val}),
    {'EXIT',{{badkey,1.0},_}} = (catch M0#{1.0:=v,1.0=>v2}),
    {'EXIT',{{badkey,42},_}} = (catch M0#{42.0:=v,42:=v2}),
    {'EXIT',{{badkey,42.0},_}} = (catch M0#{42=>v1,42.0:=v2,42:=v3}),
    {'EXIT',{{badmap,<<>>},_}} = (catch <<>>#{nonexisting:=val}),
    {'EXIT',{{badkey,<<0:257>>},_}} =
	(catch M0#{<<0:257>> := val}),		%limitation
    ok.

t_nested_pattern_expressions(Config) when is_list(Config) ->
    K1 = id("hello"),
    %K2 = id({ok}),
    [_,_,#{ <<"hi">> := wat, K1 := 42 }|_] = id([k,k,#{<<"hi">> => wat, K1 => 42}]),
    [_,_,#{ -1 := wat, K1 := 42 }|_] = id([k,k,#{-1 => wat, K1 => 42}]),
    [_,_,{#{ -1 := #{ {-3,<<0:300>>} := V1 }, K1 := 42 },3}|_] = id([k,k,{#{-1 => #{{-3,<<0:300>>}=>"hi"}, K1 => 42},3}]),
    "hi" = V1,
    %[k,#{ {-1,K1,[]} := {wat,K1}, K2 := 42 }|_] = id([k,#{{-1,K1,[]} => {wat,K1}, K2 => 42}]),
    %[k,#{ [-1,K2,[]] := {wat,K1}, K1 := 42 }|_] = id([k,#{[-1,K2,[]] => {wat,K1}, K1 => 42}]),

    M0 = id(#{ <<33:333>> => 1, <<332:333>> => ok, a => ok, wat => yep, watzor => ok }),
    F0 = map_nested_pattern_funs(M0),
    F1 = F0(wat),
    F2 = F1(watzor),
    {yep,ok} = F2(M0),
    ok.

map_nested_pattern_funs(M) ->
    K0 = id(a),
    fun(K1) ->
	    case M of
		#{ K0 := ok, K1 := yep, <<33:333>> := 1 } ->
		    fun(K2) ->
			    case M of
				#{ K2 := ok, K1 := yep, <<33:333>> := 1 } ->
				    fun
					(#{ <<332:333>> := ok, K1 := V1, K2 := V2 }) ->
					    {V1,V2}
				    end
			    end
		    end
	    end
    end.

t_guard_update_variables(Config) when is_list(Config) ->
    error  = map_guard_update_variables(n,#{},#{}),
    first  = map_guard_update_variables(x,#{}, #{x=>first}),
    second = map_guard_update_variables(x,#{y=>old}, #{x=>second,y=>old}),
    third  = map_guard_update_variables(x,#{x=>old,y=>old}, #{x=>third,y=>old}),
    fourth = map_guard_update_variables(x,#{x=>old,y=>old}, #{x=>4,y=>new}),
    ok.

map_guard_update_variables(K,M1,M2) when M1#{K=>first}    =:= M2 -> first;
map_guard_update_variables(K,M1,M2) when M1#{K=>second}   =:= M2 -> second;
map_guard_update_variables(K,M1,M2) when M1#{K:=third}    =:= M2 -> third;
map_guard_update_variables(K,M1,M2) when M1#{K:=4,y=>new} =:= M2 -> fourth;
map_guard_update_variables(_,_,_) -> error.

t_guard_sequence_variables(Config) when is_list(Config) ->
    {1,"a"} = map_guard_sequence_var_1(a,#{seq=>1,a=>id("a"),b=>no}),
    {2,"b"} = map_guard_sequence_var_1(b,#{seq=>2,b=>id("b"),a=>no}),
    {3,"c"} = map_guard_sequence_var_1(a,#{seq=>3,a=>id("c"),b=>no}),
    {4,"d"} = map_guard_sequence_var_1(b,#{seq=>4,b=>id("d"),a=>no}),
    {4,4}   = map_guard_sequence_var_1(seq,#{seq=>4}),
    {4,4,y} = map_guard_sequence_var_1(seq,#{seq=>4,b=>id("d"),a=>y}),
    {5,"d"} = map_guard_sequence_var_1(b,#{seq=>5,b=>id("d"),a=>y}),

    %% error case
    {'EXIT',{{case_clause,_},_}} = (catch map_guard_sequence_var_1("a",#{seq=>4,val=>id("e")})),
    ok.


map_guard_sequence_var_1(K,M) ->
    case M of
	#{seq:=1=Seq, K:=Val} -> {Seq,Val};
	#{seq:=2=Seq, K:=Val} -> {Seq,Val};
	#{seq:=3=Seq, K:=Val} -> {Seq,Val};
	#{K:=4=Seq,   K:=Val1,a:=Val2} -> {Seq,Val1,Val2};
	#{seq:=4=Seq, K:=Val} -> {Seq,Val};
	#{K:=4=Seq,   K:=Val} -> {Seq,Val};
	#{seq:=5=Seq, K:=Val} -> {Seq,Val}
    end.


t_guard_sequence_mixed(Config) when is_list(Config) ->
    M0 = id(#{ a=>1, b=>1, c=>1, d=>1, e=>1, f=>1, g=>1, h=>1 }),
    M1 = id(M0#{ d := 3 }),
    1 = map_guard_sequence_mixed(a,d,M1),
    M2 = id(M1#{ b := 2, d := 4, h := 2 }),
    2 = map_guard_sequence_mixed(a,d,M2),
    M3 = id(M2#{ b := 3, e := 5, g := 3 }),
    3 = map_guard_sequence_mixed(a,e,M3),
    M4 = id(M3#{ c := 4, e := 6, h := 1 }),
    4 = map_guard_sequence_mixed(a,e,M4),
    M5 = id(M4#{ c := 5, f := 7, g := 2 }),
    5 = map_guard_sequence_mixed(a,f,M5),
    M6 = id(M5#{ c := 6, f := 8, h := 3 }),
    6 = map_guard_sequence_mixed(a,f,M6),

    %% error case
    {'EXIT',{{case_clause,_},_}} = (catch map_guard_sequence_mixed(a,b,M0)),
    ok.

map_guard_sequence_mixed(K1,K2,M) ->
    case M of
	#{ K1 := 1, b := 1, K2 := 3, g := 1} -> 1;
	#{ K1 := 1, b := 2, K2 := 4, h := 2} -> 2;
	#{ K1 := 1, b := 3, K2 := 5, g := 3} -> 3;
	#{ K1 := 1, c := 4, K2 := 6, h := 1} -> 4;
	#{ K1 := 1, c := 5, K2 := 7, g := 2} -> 5;
	#{ K1 := 1, c := 6, K2 := 8, h := 3} -> 6
    end.

%% register corruption discovered in 18 due to
%% get_map_elements might destroys registers when fail-label is taken.
%% Only seen when patterns have two targets,
%% specifically: we copy one register, and then jump.
%%    {test,is_map,{f,5},[{x,1}]}.
%%
%%    {get_map_elements,{f,7},{x,1},{list,[{atom,a},{x,1},{atom,b},{x,2}]}}.
%%    %% if 'a' exists but not 'b' {x,1} is overwritten, jump {f,7}
%%
%%    {move,{integer,1},{x,0}}.
%%    {call_only,3,{f,10}}.
%%
%%  {label,7}.
%%    {get_map_elements,{f,8},{x,1},{list,[{atom,b},{x,2}]}}.
%%    %% {x,1} (src) is now corrupt
%%
%%    {move,{x,0},{x,1}}.
%%    {move,{integer,2},{x,0}}.
%%    {call_only,3,{f,10}}.
%%
%% Only happens in beam_block opt_move pass with two destinations.

t_register_corruption(Config) when is_list(Config) ->
    M = #{a=> <<"value">>, c=>3},
    {3,wanted,<<"value">>} = register_corruption_bar(M,wanted),
    {3,wanted,<<"value">>} = register_corruption_foo(wanted,M),
    ok.

register_corruption_foo(A,#{a := V1, b := V2}) ->
    register_corruption_dummy_call(1,V1,V2);
register_corruption_foo(A,#{b := V}) ->
    register_corruption_dummy_call(2,A,V);
register_corruption_foo(A,#{a := V}) ->
    register_corruption_dummy_call(3,A,V).

register_corruption_bar(M,A) ->
    case M of
        #{a := V1, b := V2} ->
            register_corruption_dummy_call(1,V1,V2);
        #{b := V} ->
            register_corruption_dummy_call(2,A,V);
        #{a := V} ->
            register_corruption_dummy_call(3,A,V)
    end.


register_corruption_dummy_call(A,B,C) -> {A,B,C}.


t_frequency_table(Config) when is_list(Config) ->
    rand:seed(exsplus, {13,1337,54}),		% pseudo random
    N = 100000,
    Ts = rand_terms(N),
    #{ n:=N, tf := Tf } = frequency_table(Ts,#{ n=>0, tf => #{}}),
    ok = check_frequency(Ts,Tf),
    ok.


frequency_table([T|Ts], M) ->
    case M of
	#{ n := N, tf := #{ T := C } = F } ->
	    frequency_table(Ts,M#{ n := N + 1, tf := F#{ T := C + 1 }});
	#{ n := N, tf := F } ->
	    frequency_table(Ts,M#{ n := N + 1, tf := F#{ T => 1 }})
    end;
frequency_table([], M) -> M.


check_frequency(Ts,Tf) ->
    check_frequency(Ts,Tf,dict:new()).

check_frequency([T|Ts],Tf,D) ->
    case dict:find(T,D) of
	error  -> check_frequency(Ts,Tf,dict:store(T,1,D));
	{ok,C} -> check_frequency(Ts,Tf,dict:store(T,C+1,D))
    end;
check_frequency([],Tf,D) ->
    validate_frequency(dict:to_list(D),Tf).

validate_frequency([{T,C}|Fs],Tf) ->
    case Tf of
	#{ T := C } -> validate_frequency(Fs,Tf);
	_ -> error
    end;
validate_frequency([], _) -> ok.


t_bad_update(_Config) ->
    {#{0.0:=Id},#{}} = properly(#{}),
    42 = Id(42),
    {'EXIT',{{badmap,_},_}} = (catch increase(0)),
    ok.

properly(Item) ->
    {Item#{0.0 => fun id/1},Item}.

increase(Allows) ->
    catch fun() -> Allows end#{[] => +Allows, "warranty" => fun id/1}.


%% aux

rand_terms(0) -> [];
rand_terms(N) -> [rand_term()|rand_terms(N-1)].

rand_term() ->
    case rand:uniform(6) of
	1 -> rand_binary();
	2 -> rand_number();
	3 -> rand_atom();
	4 -> rand_tuple();
	5 -> rand_list();
	6 -> rand_map()
    end.

rand_binary() ->
    case rand:uniform(3) of
	1 -> <<>>;
	2 -> <<"hi">>;
	3 -> <<"message text larger than 64 bytes. yep, message text larger than 64 bytes.">>
    end.

rand_number() ->
    case rand:uniform(3) of
	1 -> rand:uniform(5);
	2 -> float(rand:uniform(5));
	3 -> 1 bsl (63 + rand:uniform(3))
    end.

rand_atom() ->
    case rand:uniform(3) of
	1 -> hi;
	2 -> some_atom;
	3 -> some_other_atom
    end.


rand_tuple() ->
    case rand:uniform(3) of
	1 -> {ok, rand_term()}; % careful
	2 -> {1, 2, 3};
	3 -> {<<"yep">>, 1337}
    end.

rand_list() ->
    case rand:uniform(3) of
	1 -> "hi";
	2 -> [1,rand_term()]; % careful
	3 -> [improper|list]
    end.

rand_map() ->
    case rand:uniform(3) of
	1 -> #{ hi => 3 };
	2 -> #{ wat => rand_term(), other => 3 };  % careful
	3 -> #{ hi => 42, other => 42, yet_anoter => 1337 }
    end.



%% Use this function to avoid compile-time evaluation of an expression.
id(I) -> I.