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%% -*- erlang-indent-level: 2 -*-
%%-------------------------------------------------------------------------
-module(maps_put_map_assoc).
-export([test/0]).
test() ->
true = assoc_guard(#{}),
false = assoc_guard(not_a_map),
#{a := true} = assoc_update(#{}),
{'EXIT', {badarg, [{?MODULE, assoc_update, 1, _}|_]}}
= (catch assoc_update(not_a_map)),
ok = assoc_guard_clause(#{}),
{'EXIT', {function_clause, [{?MODULE, assoc_guard_clause, _, _}|_]}}
= (catch assoc_guard_clause(not_a_map)),
ok.
assoc_guard(M) when is_map(M#{a => b}) -> true;
assoc_guard(_) -> false.
assoc_update(M) -> M#{a => true}.
assoc_guard_clause(M) when is_map(M#{a => 3}) -> ok.
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