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PERL5161DELTA(1)                      Perl Programmers Reference Guide                      PERL5161DELTA(1)



NAME
       perl5161delta - what is new for perl v5.16.1

DESCRIPTION
       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.

Security
   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 1.25.

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.

Acknowledgements
       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 http://rt.perl.org/perlbug/ .  There may
       also be information at http://www.perl.org/ , 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 perlbug@perl.org 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 perl5-security-report@perl.org. 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.

SEE ALSO
       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.



perl v5.16.2                                     2012-10-11                                 PERL5161DELTA(1)