++ed by:

177 PAUSE users
171 non-PAUSE users.

Matthew Horsfall (alh)
and 1 contributors


[ this is a template for a new perldelta file. Any text flagged as XXX needs to be processed before release. ]

perl5270delta - what is new for perl v5.27.0


This document describes differences between the 5.26.0 release and the 5.27.0 release.

If you are upgrading from an earlier release such as 5.25.0, first read perl5260delta, which describes differences between 5.25.0 and 5.26.0.

Modules and Pragmata

Updated Modules and Pragmata

  • feature has been upgraded from version 1.47 to 1.48.

  • Module::CoreList has been upgraded from version 5.20170530 to 5.20170531.


Perl 5.26.1 represents approximately 0 weeks of development since Perl 5.26.0 and contains approximately 7,200 lines of changes across 43 files from 2 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 72 lines of changes to 8 .pm, .t, .c and .h files.

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 5.26.1:

Ricardo Signes, Sawyer X.

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 perl bug database at https://rt.perl.org/ . 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 see "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to report the issue.

Give Thanks

If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you can do so by running the perlthanks program:


This will send an email to the Perl 5 Porters list with your show of thanks.


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.