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-rw-r--r--lib/dialyzer/test/opaque_SUITE_data/src/opaque/opaque_adt.erl2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/dialyzer/test/opaque_SUITE_data/src/opaque/opaque_adt.erl b/lib/dialyzer/test/opaque_SUITE_data/src/opaque/opaque_adt.erl
index 3456f0e9c6..cdcaa5f9e8 100644
--- a/lib/dialyzer/test/opaque_SUITE_data/src/opaque/opaque_adt.erl
+++ b/lib/dialyzer/test/opaque_SUITE_data/src/opaque/opaque_adt.erl
@@ -3,6 +3,8 @@
-opaque abc() :: 'a' | 'b' | 'c'.
+-spec atom_or_list(_) -> abc() | list().
+
atom_or_list(1) -> a;
atom_or_list(2) -> b;
atom_or_list(3) -> c;