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

perl5250delta - what is new for perl v5.25.0


This document describes differences between the 5.24.0 release and the 5.25.0 release.

Known Problems

  • Some modules have been broken by the context stack rework. These modules were relying on non-guaranteed implementation details in perl. Their maintainers have been informed, and should contact perl5-porters for advice if needed. Below is a subset of these modules:


    Coro and perl v5.22.0 were already incompatible due to a change in the perl, and the reworking on the perl context stack creates a further incompatibility. perl5-porters has discussed the issue on the mailing list.

  • The module lexical::underscore no longer works on perl v5.24.0, because perl no longer has a lexical $_!

  • mod_perl has been patched for compatibility for v5.22.0 and later but no release has been made. The relevant patch (and other changes) can be found in their source code repository, mirrored at GitHub.


XXX Generate this with:

  perl Porting/acknowledgements.pl v5.24.0..HEAD

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 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.


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.