1 files changed, 29 insertions, 0 deletions
diff --git a/lib/dialyzer/test/small_SUITE_data/src/keydel.erl b/lib/dialyzer/test/small_SUITE_data/src/keydel.erl
new file mode 100644
index 0000000000..18a5c0670c
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/keydel.erl
@@ -0,0 +1,29 @@
+-module(keydel).
+
+-export([store/3]).
+
+-record(att, {f}).
+
+-type attachment() :: list().
+
+-opaque att() :: #att{} | attachment().
+
+-spec store(atom(), any(), att()) -> att().
+store(Field, undefined, Att) when is_list(Att) ->
+    lists:keydelete(Field, 1, Att);
+store(Field, Value, Att) when is_list(Att) ->
+    lists:keystore(Field, 1, Att, {Field, Value});
+store(Field, Value, Att) ->
+    store(Field, Value, upgrade(Att)).
+
+
+-spec upgrade(#att{}) -> attachment().
+upgrade(#att{} = Att) ->
+    Map = lists:zip(
+            record_info(fields, att),
+            lists:seq(2, record_info(size, att))
+           ),
+    %% Don't store undefined elements since that is default
+    [{F, element(I, Att)} || {F, I} <- Map, element(I, Att) /= undefined];
+upgrade(Att) ->
+    Att.