Fix issue #1705170 (backport from trunk)
diff --git a/Misc/NEWS b/Misc/NEWS
index 2cf7be4..aad83fd 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -32,6 +32,9 @@
 Library
 -------
 
+- Issue #1705170: contextlib.contextmanager was still swallowing
+  StopIteration in some cases. This should no longer happen.
+
 - Bug #1307: Fix smtpd so it doesn't raise an exception when there is no arg.
 
 - ctypes will now work correctly on 32-bit systems when Python is