From af320b389bba5221870553e70eaefee3bdf860e5 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Wed, 8 Jul 2015 22:58:55 +0300
Subject: [PATCH] Added regression test for issue24581.

---
 Lib/test/test_set.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 65e424307fa..f084ebeaddf 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -1731,6 +1731,17 @@ class TestWeirdBugs(unittest.TestCase):
         be_bad = True
         set1.symmetric_difference_update(dict2)
 
+    def test_iter_and_mutate(self):
+        # Issue #24581
+        s = set(range(100))
+        s.clear()
+        s.update(range(100))
+        si = iter(s)
+        s.clear()
+        a = list(range(100))
+        s.update(range(100))
+        list(si)
+
 # Application tests (based on David Eppstein's graph recipes ====================================
 
 def powerset(U):