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Tony Cook > perl-5.19.9 > perl5195delta


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Source   Latest Release: perl-5.19.11


perl5195delta - what is new for perl v5.19.5


This document describes differences between the 5.19.4 release and the 5.19.5 release.

If you are upgrading from an earlier release such as 5.19.3, first read perl5194delta, which describes differences between 5.19.3 and 5.19.4.

Core Enhancements ^

Unicode 6.3 now supported

Perl now supports and is shipped with Unicode 6.3 (though Perl may be recompiled with any previous Unicode release as well). A detailed list of Unicode 6.3 changes is at

Experimental Postfix Dereferencing

When the postderef feature is in effect, the following syntactical equivalencies are set up:

  $sref->$*;  # same as ${ $sref }  # interpolates
  $aref->@*;  # same as @{ $aref }  # interpolates
  $href->%*;  # same as %{ $href }
  $cref->&*;  # same as &{ $cref }
  $gref->**;  # same as *{ $gref }

  $gref->*{ $slot }; # same as *{ $gref }{ $slot }

  $aref->@[ ... ];  # same as @$aref[ ... ]  # interpolates
  $href->@{ ... };  # same as @$href{ ... }  # interpolates
  $aref->%[ ... ];  # same as %$aref[ ... ]
  $href->%{ ... };  # same as %$href{ ... }

Those marked as interpolating only interpolate if the associated postderef_qq feature is also enabled. This feature is experimental and will trigger experimental::postderef-category warnings when used, unless they are suppressed.

For more information, consult the Postfix Dereference Syntax section of perlref.

subs now take a prototype attribute

When declaring or defining a sub, the prototype can now be specified inside of a prototype attribute instead of in parens following the name.

For example, sub foo($$){} could be rewritten as sub foo : prototype($$){}.

Incompatible Changes ^

Functions PerlIO_vsprintf and PerlIO_sprintf have been removed

These two functions, undocumented, unused in CPAN, and problematic, have been removed.

Performance Enhancements ^

Modules and Pragmata ^

Updated Modules and Pragmata

Documentation ^

Changes to Existing Documentation




Diagnostics ^

The following additions or changes have been made to diagnostic output, including warnings and fatal error messages. For the complete list of diagnostic messages, see perldiag.

New Diagnostics

New Warnings

Utility Changes ^


Testing ^

Platform Support ^

Platform-Specific Notes


The Windows MinGW/gcc build was broken in Perl 5.19.4 for some recent versions of gcc-4.8, including those from . This has now been fixed. [perl #120236]

Selected Bug Fixes ^

Acknowledgements ^

Perl 5.19.5 represents approximately 4 weeks of development since Perl 5.19.4 and contains approximately 76,000 lines of changes across 710 files from 27 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 5.19.5:

Andy Dougherty, Brian Fraser, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Daniel Dragan, David Golden, David Mitchell, David Nicol, Dominic Hargreaves, Eric Brine, Father Chrysostomos, Gideon Israel Dsouza, Hio, James E Keenan, Jerry D. Hedden, Jesse Luehrs, Karl Williamson, Matthew Horsfall, Max Maischein, Neil Bowers, Nicholas Clark, Peter Martini, Philip Guenther, Ricardo Signes, Steve Hay, 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.

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