Issue #19018: The heapq.merge() function no longer suppresses IndexError
diff --git a/Lib/test/test_heapq.py b/Lib/test/test_heapq.py
index 73b88f0..c4de593 100644
--- a/Lib/test/test_heapq.py
+++ b/Lib/test/test_heapq.py
@@ -158,6 +158,15 @@
self.assertEqual(sorted(chain(*inputs)), list(self.module.merge(*inputs)))
self.assertEqual(list(self.module.merge()), [])
+ def test_merge_does_not_suppress_index_error(self):
+ # Issue 19018: Heapq.merge suppresses IndexError from user generator
+ def iterable():
+ s = list(range(10))
+ for i in range(20):
+ yield s[i] # IndexError when i > 10
+ with self.assertRaises(IndexError):
+ list(self.module.merge(iterable(), iterable()))
+
def test_merge_stability(self):
class Int(int):
pass