Issue #6271: mmap tried to close invalid file handle (-1) when annonymous.
(On Unix) Patch by STINNER Victor.
diff --git a/Misc/NEWS b/Misc/NEWS
index 8af9914..aabdc21 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -325,6 +325,9 @@
 Library
 -------
 
+- Issue #6271: mmap tried to close invalid file handle (-1) when annonymous.
+  (On Unix)
+
 - Issue #6215: All bug fixes and enhancements from the Python 3.1 io library
   (including the fast C implementation) have been backported to the standard
   ``io`` module.