Fix a crash when the return value of a subgenerator is a temporary

object (with a refcount of 1)

1 files changed, 11 insertions, 0 deletions

diff --git a/Lib/test/test_pep380.py b/Lib/test/test_pep380.py
index 6554b0f..3a1db29 100644
--- a/Lib/test/test_pep380.py
+++ b/Lib/test/test_pep380.py
@@ -364,6 +364,17 @@ class TestPEP380Operation(unittest.TestCase):
         ])
 
 
+    def test_exception_value_crash(self):
+        # There used to be a refcount error when the return value
+        # stored in the StopIteration has a refcount of 1.
+        def g1():
+            yield from g2()
+        def g2():
+            yield "g2"
+            return [42]
+        self.assertEqual(list(g1()), ["g2"])
+
+
     def test_generator_return_value(self):
         """
         Test generator return value