From 9fbc1610e45e020a90ab2a766f6d7eb46a203847 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sat, 8 May 2004 20:57:16 +0000
Subject: [PATCH] SF #950057:  itertools.chain doesn't "process" exceptions as
 they occur

Both cycle() and chain() were handling exceptions only when switching
input sources.  The patch makes the handle more immediate.
---
 Misc/NEWS | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Misc/NEWS b/Misc/NEWS
index 8c3f56cef98d..c331a13b1131 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -42,6 +42,10 @@ Core and builtins
 Library
 -------
 
+- Bug #950057: itertools.chain() and itertools.cycle() now handle
+               exceptions immediately instead of waiting until the
+               input source is updated.
+
 - Bug #931848: Fix _sre.CODESIZE on 64-bit machines in UCS-4 mode.
 
 - Bug #938076: Consider output encoding in XMLGenerator.
-- 
2.47.3