perl5361delta - what is new for perl v5.36.1


This document describes differences between the 5.36.0 release and the 5.36.1 release.

If you are upgrading from an earlier release such as 5.35.0, first read perl5360delta, which describes differences between 5.35.0 and 5.36.0.

Incompatible Changes

There are no changes intentionally incompatible with 5.36.0. 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

Configuration and Compilation

  • Configure probed for the return type of malloc() and free() by testing whether declarations for those functions produced a function type mismatch with the implementation. On Solaris, with a C++ compiler, this check always failed, since Solaris instead imports malloc() and free() from std:: with using for C++ builds. Since the return types of malloc() and free() are well defined by the C standard, skip probing for them. Configure command-line arguments and hints can still override these type in the unlikely case that is needed. [GH #20806]


Tests were added and changed to reflect the other additions and changes in this release.

Selected Bug Fixes

  • An eval() as the last statement in a regex code block could trigger an interpreter panic; e.g.

        /(?{ ...; eval {....}; })/

    [GH #19680]

  • An eval EXPR referring to a lexical sub defined in grandparent scope no longer produces an assertion failures. [GH #19857]

  • Writing to a magic variables associated with the selected output handle, $^, $~, $=, $- and $%, no longer crashes perl if the IO object has been cleared from the selected output handle. [GH #20733]


Perl 5.36.1 represents approximately 11 months of development since Perl 5.36.0 and contains approximately 5,500 lines of changes across 62 files from 24 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 1,600 lines of changes to 23 .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 5.36.1:

Andreas König, Bram, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, David Mitchell, Elvin Aslanov, Florian Weimer, Graham Knop, Hugo van der Sanden, Karen Etheridge, Karl Williamson, Leon Timmermans, Matthew Horsfall, Max Maischein, Neil Bowers, Nicolas R, Renee Baecker, Ricardo Signes, Richard Leach, Steve Hay, Todd Rinaldo, Tony Cook, Yves Orton.

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.