1 files changed, 63 insertions, 0 deletions
diff --git a/lib/dialyzer/test/map_SUITE_data/src/bug.erl b/lib/dialyzer/test/map_SUITE_data/src/bug.erl
new file mode 100644
index 0000000000..fc32f5641a
--- /dev/null
+++ b/lib/dialyzer/test/map_SUITE_data/src/bug.erl
@@ -0,0 +1,63 @@
+-module(bug).
+
+-export([t1/0, f1/1
+	,t2/0, f2/1
+	,t3/0, f3/1
+	,t4/0, f4/1
+	,t5/0, f5/1
+	]).
+
+t1() ->
+    V = f1(#{a=>b}),
+    case V of
+	#{a := Q} -> Q; %% Must not warn here
+	_ -> ok
+    end,
+    ok.
+
+f1(M) -> %% Should get map() succ typing
+    #{} = M.
+
+t2() ->
+    V = f2([#{a=>b}]),
+    case V of
+	[#{a := P}] -> P; %% Must not warn here
+	_ -> ok
+    end,
+    ok.
+
+f2(M) -> %% Should get [map(),...] succ typing
+    [#{}] = M.
+
+t3() ->
+    V = f3([#{a=>b},a]),
+    case V of
+	[#{a := P}, _Q] -> P; %% Must not warn here
+	_ -> ok
+    end,
+    ok.
+
+f3(M) -> %% Should get [map()|a,...] succ typing
+    [#{},a] = M.
+
+t4() ->
+    V = f4({#{a=>b},{}}),
+    case V of
+	{#{a := P},{}} -> P; %% Must not warn here
+	_ -> ok
+    end,
+    ok.
+
+f4(M) -> %% Should get {map(),{}} succ typing
+    {#{},{}} = M.
+
+t5() ->
+    V = f5(#{k=>q,a=>b}),
+    case V of
+	#{k := q, a := P} -> P; %% Must not warn here
+	_ -> ok
+    end,
+    ok.
+
+f5(M) -> %% Should get #{k:=q, ...} succ typing
+    #{k:=q} = M.