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-module(map_in_guard2).
-export([test/0]).
test() ->
false = assoc_guard(not_a_map),
{'EXIT', {{badmap, not_a_map}, [{?MODULE, assoc_update, 1, _}|_]}}
= (catch assoc_update(not_a_map)),
{'EXIT', {function_clause, [{?MODULE, assoc_guard_clause, _, _}|_]}}
= (catch assoc_guard_clause(not_a_map)),
{'EXIT', {function_clause, [{?MODULE, assoc_guard_clause, _, _}|_]}}
= (catch (begin true = exact_guard(#{}) end)),
{'EXIT', {function_clause, [{?MODULE, exact_guard_clause, _, _}|_]}}
= (catch exact_guard_clause(#{})),
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.
exact_guard(M) when (false =/= M#{a := b}) -> true;
exact_guard(_) -> false.
exact_guard_clause(M) when (false =/= M#{a := b}) -> ok.
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