You are viewing the version of this documentation from Perl 5.35.5. This is a development version of Perl.



perldelta - what is new for perl v5.35.5


This document describes differences between the 5.35.4 release and the 5.35.5 release.

If you are upgrading from an earlier release such as 5.35.3, first read perl5354delta, which describes differences between 5.35.3 and 5.35.4.

Core Enhancements

iterating over multiple values at a time

As of Perl 5.36, you can iterate over multiple values at a time by specifying a list of lexicals within parentheses. For example,

for my ($key, $value) (%hash) { ... }
for my ($left, $right, $gripping) (@moties) { ... }

Attempting to specify a list after for my was previously a syntax error.

For more detail see "Compound Statements" in perlsyn.

Incompatible Changes

There are no changes intentionally incompatible with 5.35.4 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


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:



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 Errors

New Warnings

Changes to Existing Diagnostics

Configuration and Compilation


Tests were added and changed to reflect the other additions and changes in this release. Furthermore, these significant changes were made:

Platform Support

Discontinued Platforms


Support code for Novell NetWare has been removed. NetWare was a server operating system by Novell. The port was last updated in July 2002, and the platform itself in May 2009.

Unrelated changes accidentally broke the build for the NetWare port in September 2009, and in 12 years no-one has reported this.

Platform-Specific Notes


Support for old MSVC++ (pre-VC12) has been removed

These did not support C99 and hence can no longer be used to compile perl.

Internal Changes

Selected Bug Fixes


Perl 5.35.5 represents approximately 4 weeks of development since Perl 5.35.4 and contains approximately 32,000 lines of changes across 380 files from 22 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 17,000 lines of changes to 260 .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 5.35.5:

Andrew Fresh, Chris 'BinGOs' Williams, Dagfinn Ilmari Mannsåker, Dan Book, Dan Kogai, David Mitchell, E. Choroba, Hugo van der Sanden, James E Keenan, Karl Williamson, Leon Timmermans, Matthew Horsfall, Nicholas Clark, Olaf Alders, Paul Evans, Ricardo Signes, Richard Leach, Sergey Poznyakoff, Steve Hay, TAKAI Kousuke, Tomasz Konojacki, 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.