You are viewing the version of this documentation from Perl 5.35.10. This is a development version of Perl.



perl5353delta - what is new for perl v5.35.3


This document describes differences between the 5.35.2 release and the 5.35.3 release.

If you are upgrading from an earlier release such as 5.35.1, first read perl5352delta, which describes differences between 5.35.1 and 5.35.2.


With this release, the experimental switch feature, present in every feature bundle since they were introduced in v5.10, has been removed from the v5.36 bundle. If you want to live dangerously and use it, you'll have to enable it explicitly.

Core Enhancements

All warnings are enabled automatically within the scope of a use v5.35 (or higher) declaration.

Modules and Pragmata

Updated Modules and Pragmata


New Documentation


This document provides the process for administering an election or vote within the Perl Core Team.

Changes to Existing Documentation

We have attempted to update the documentation to reflect the changes listed in this document. If you find any we have missed, open an issue at

Additionally, the following selected changes have been made:




Configuration and Compilation

Internal Changes

Selected Bug Fixes

Errata From Previous Releases


Perl 5.35.3 represents approximately 4 weeks of development since Perl 5.35.2 and contains approximately 16,000 lines of changes across 220 files from 25 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 9,200 lines of changes to 140 .pm, .t, .c and .h files.

Perl continues to flourish into its fourth decade thanks to a vibrant community of users and developers. The following people are known to have contributed the improvements that became Perl 5.35.3:

Aristotle Pagaltzis, Asher Mancinelli, Ben Cornett, Biswapriyo Nath, Chris 'BinGOs' Williams, Dagfinn Ilmari Mannsåker, Dan Book, Dan Jacobson, David Golden, David Mitchell, H.Merijn Brand, James E Keenan, Karen Etheridge, Karl Williamson, Leon Timmermans, Max Maischein, Neil Bowers, Nicholas Clark, Petar-Kaleychev, Ricardo Signes, Richard Leach, Slaven Rezic, TAKAI Kousuke, Thibault Duponchelle, 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 perl bug database at There may also be information at, the Perl Home Page.

If you believe you have an unreported bug, please open an issue at Be sure to trim your bug down to a tiny but sufficient test case.

If the bug you are reporting has security implications which make it inappropriate to send to a public issue tracker, 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.