From eec9331b207cf7def6f04156d00a8479d1630dd3 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Thu, 18 Aug 2016 18:13:10 +0200
Subject: Fix SystemError in "raise" statement

Issue #27558: Fix a SystemError in the implementation of "raise" statement.
In a brand new thread, raise a RuntimeError since there is no active
exception to reraise.

Patch written by Xiang Zhang.
---
 Lib/test/test_threading.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'Lib/test/test_threading.py')

diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 1c9c1ea534..b63050982a 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -1043,6 +1043,24 @@ class ThreadingExceptionTests(BaseTestCase):
         self.assertEqual(out, b'')
         self.assertNotIn("Unhandled exception", err.decode())
 
+    def test_bare_raise_in_brand_new_thread(self):
+        def bare_raise():
+            raise
+
+        class Issue27558(threading.Thread):
+            exc = None
+
+            def run(self):
+                try:
+                    bare_raise()
+                except Exception as exc:
+                    self.exc = exc
+
+        thread = Issue27558()
+        thread.start()
+        thread.join()
+        self.assertIsNotNone(thread.exc)
+        self.assertIsInstance(thread.exc, RuntimeError)
 
 class TimerTests(BaseTestCase):
 
-- 
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