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-rw-r--r--Lib/test/test_set.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index a13f886..2b43a16 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -82,6 +82,10 @@ class TestJointOps(unittest.TestCase):
self.assertEqual(self.thetype('abcba').union(C('ef')), set('abcef'))
self.assertEqual(self.thetype('abcba').union(C('ef'), C('fg')), set('abcefg'))
+ # Issue #6573
+ x = self.thetype()
+ self.assertEqual(x.union(set([1]), x, set([2])), self.thetype([1, 2]))
+
def test_or(self):
i = self.s.union(self.otherword)
self.assertEqual(self.s | set(self.otherword), i)