[2.0.x] Fixed #29166 -- Fixed crash in When() expression with a list argument.

Thanks Matthew Pava for the report and Tim Graham and Carlton Gibson for
reviews.
Regression in 19b2dfd1bfe7fd716dd3d8bfa5f972070d83b42f.

Backport of 54f80430be4a9adf1fc00b4ca17547415fafc69b from master

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/expressions_case/tests.py b/tests/expressions_case/tests.py
index 090607e8b8..256be935ef 100644
--- a/tests/expressions_case/tests.py
+++ b/tests/expressions_case/tests.py
@@ -1293,3 +1293,21 @@ class CaseDocumentationExamples(TestCase):
             [('Jack Black', 'P')],
             transform=attrgetter('name', 'account_type')
         )
+
+    def test_hash(self):
+        expression_1 = Case(
+            When(account_type__in=[Client.REGULAR, Client.GOLD], then=1),
+            default=2,
+            output_field=models.IntegerField(),
+        )
+        expression_2 = Case(
+            When(account_type__in=(Client.REGULAR, Client.GOLD), then=1),
+            default=2,
+            output_field=models.IntegerField(),
+        )
+        expression_3 = Case(When(account_type__in=[Client.REGULAR, Client.GOLD], then=1), default=2)
+        expression_4 = Case(When(account_type__in=[Client.PLATINUM, Client.GOLD], then=2), default=1)
+        self.assertEqual(hash(expression_1), hash(expression_2))
+        self.assertNotEqual(hash(expression_2), hash(expression_3))
+        self.assertNotEqual(hash(expression_1), hash(expression_4))
+        self.assertNotEqual(hash(expression_3), hash(expression_4))