1 files changed, 28 insertions, 0 deletions
diff --git a/lib/hipe/test/maps_SUITE_data/maps_put_map_exact.erl b/lib/hipe/test/maps_SUITE_data/maps_put_map_exact.erl
new file mode 100644
index 0000000000..1cfcd80180
--- /dev/null
+++ b/lib/hipe/test/maps_SUITE_data/maps_put_map_exact.erl
@@ -0,0 +1,28 @@
+%% -*- erlang-indent-level: 2 -*-
+%%-------------------------------------------------------------------------
+-module(maps_put_map_exact).
+
+-export([test/0]).
+
+test() ->
+  false = exact_guard(#{b => a}),
+  false = exact_guard(not_a_map),
+  true  = exact_guard(#{a => false}),
+  #{a := true} = exact_update(#{a => false}),
+  {'EXIT', {badarg, [{?MODULE, exact_update, 1, _}|_]}}
+    = (catch exact_update(not_a_map)),
+  {'EXIT', {badarg, [{?MODULE, exact_update, 1, _}|_]}}
+    = (catch exact_update(#{})),
+  ok = exact_guard_clause(#{a => yes}),
+  {'EXIT', {function_clause, [{?MODULE, exact_guard_clause, _, _}|_]}}
+    = (catch exact_guard_clause(#{})),
+  {'EXIT', {function_clause, [{?MODULE, exact_guard_clause, _, _}|_]}}
+    = (catch exact_guard_clause(not_a_map)),
+  ok.
+
+exact_guard(M) when is_map(M#{a := b}) -> true;
+exact_guard(_) -> false.
+
+exact_update(M) -> M#{a := true}.
+
+exact_guard_clause(M) when is_map(M#{a := 42}) -> ok.