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-module(map_size).
-export([t1/0, e1/0, t2/0, t3/0, t4/0, t5/1, t6/1, t7/1]).
t1() ->
0 = maps:size(#{}),
1 = maps:size(#{}).
e1() ->
0 = map_size(#{}),
1 = map_size(#{}).
t2() -> p(#{a=>x}).
p(M) when map_size(M) =:= 0 -> ok.
t3() ->
1 = map_size(cio()),
2 = map_size(cio()),
3 = map_size(cio()),
4 = map_size(cio()).
t4() ->
0 = map_size(cio()).
t5(M) when map_size(M) =:= 0 ->
#{a := _} = M. %% Only t5 has no local return; want better message
t6(M) when map_size(M) =:= 0 ->
#{} = M.
t7(M=#{a := _}) when map_size(M) =:= 1 ->
#{b := _} = M. %% We should warn here too
-spec cio() -> #{3 := ok, 9 => _, 11 => x}.
cio() -> binary_to_term(<<131,116,0,0,0,2,97,3,100,0,2,111,107,97,9,97,6>>).
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