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       perl5161delta - what is new for perl v5.16.1


       This document describes differences between the 5.16.0 release and the 5.16.1 release.

       If you are upgrading from an earlier release such as 5.14.0, first read perl5160delta,
       which describes differences between 5.14.0 and 5.16.0.


   an off-by-two error in Scalar-List-Util has been fixed
       The bugfix was in Scalar-List-Util 1.23_04, and perl 5.16.1 includes Scalar-List-Util

Incompatible Changes

       There are no changes intentionally incompatible with 5.16.0 If any exist, they are bugs,
       and we request that you submit a report.  See "Reporting Bugs" below.

Modules and Pragmata

   Updated Modules and Pragmata
       ·   Scalar::Util and List::Util have been upgraded from version 1.23 to version 1.25.

       ·   B::Deparse has been updated from version 1.14 to 1.14_01.  An "uninitialized" warning
           emitted by B::Deparse has been squashed [perl #113464].

Configuration and Compilation

       ·   Building perl with some Windows compilers used to fail due to a problem with
           miniperl's "glob" operator (which uses the "perlglob" program) deleting the PATH
           environment variable [perl #113798].

Platform Support

   Platform-Specific Notes
       VMS All C header files from the top-level directory of the distribution are now installed
           on VMS, providing consistency with a long-standing practice on other platforms.
           Previously only a subset were installed, which broke non-core extension builds for
           extensions that depended on the missing include files.

Selected Bug Fixes

       ·   A regression introduced in Perl v5.16.0 involving "tr/SEARCHLIST/REPLACEMENTLIST/" has
           been fixed.  Only the first instance is supposed to be meaningful if a character
           appears more than once in "SEARCHLIST".  Under some circumstances, the final instance
           was overriding all earlier ones.  [perl #113584]

       ·   "B::COP::stashlen" has been added.   This provides access to an internal field added
           in perl 5.16 under threaded builds.  It was broken at the last minute before 5.16 was
           released [perl #113034].

       ·   The re pragma will no longer clobber $_. [perl #113750]

       ·   Unicode 6.1 published an incorrect alias for one of the Canonical_Combining_Class
           property's values (which range between 0 and 254).  The alias "CCC133" should have
           been "CCC132".  Perl now overrides the data file furnished by Unicode to give the
           correct value.

       ·   Duplicating scalar filehandles works again.  [perl #113764]

       ·   Under threaded perls, a runtime code block in a regular expression could corrupt the
           package name stored in the op tree, resulting in bad reads in "caller", and possibly
           crashes [perl #113060].

       ·   For efficiency's sake, many operators and built-in functions return the same scalar
           each time.  Lvalue subroutines and subroutines in the CORE:: namespace were allowing
           this implementation detail to leak through.  "print &CORE::uc("a"), &CORE::uc("b")"
           used to print "BB".  The same thing would happen with an lvalue subroutine returning
           the return value of "uc".  Now the value is copied in such cases [perl #113044].

       ·   "__SUB__" now works in special blocks ("BEGIN", "END", etc.).

       ·   Formats that reference lexical variables from outside no longer result in crashes.

Known Problems

       There are no new known problems, but consult "Known Problems" in perl5160delta to see
       those identified in the 5.16.0 release.


       Perl 5.16.1 represents approximately 2 months of development since Perl 5.16.0 and
       contains approximately 14,000 lines of changes across 96 files from 8 authors.

       Perl continues to flourish into its third decade thanks to a vibrant community of users
       and developers. The following people are known to have contributed the improvements that
       became Perl 5.16.1:

       Chris 'BinGOs' Williams, Craig A. Berry, Father Chrysostomos, Karl Williamson, Paul
       Johnson, Reini Urban, Ricardo Signes, Tony Cook.

       The list above is almost certainly incomplete as it is automatically generated from
       version control history. In particular, it does not include the names of the (very much
       appreciated) contributors who reported issues to the Perl bug tracker.

       Many of the changes included in this version originated in the CPAN modules included in
       Perl's core. We're grateful to the entire CPAN community for helping Perl to flourish.

       For a more complete list of all of Perl's historical contributors, please see the AUTHORS
       file in the Perl source distribution.

Reporting Bugs

       If you find what you think is a bug, you might check the articles recently posted to the
       comp.lang.perl.misc newsgroup and the perl bug database at .
       There may also be information at , the Perl Home Page.

       If you believe you have an unreported bug, please run the perlbug program included with
       your release.  Be sure to trim your bug down to a tiny but sufficient test case.  Your bug
       report, along with the output of "perl -V", will be sent off to to be
       analysed by the Perl porting team.

       If the bug you are reporting has security implications, which make it inappropriate to
       send to a publicly archived mailing list, then please send it to This points to a closed subscription unarchived mailing
       list, which includes all the core committers, who will be able to help assess the impact
       of issues, figure out a resolution, and help co-ordinate the release of patches to
       mitigate or fix the problem across all platforms on which Perl is supported. Please only
       use this address for security issues in the Perl core, not for modules independently
       distributed on CPAN.


       The Changes file for an explanation of how to view exhaustive details on what changed.

       The INSTALL file for how to build Perl.

       The README file for general stuff.

       The Artistic and Copying files for copyright information.