Scroll to navigation

PERL52511DELTA(1) Perl Programmers Reference Guide PERL52511DELTA(1)


perl52511delta - what is new for perl v5.25.11


This document describes differences between the 5.25.10 release and the 5.25.11 release.

If you are upgrading from an earlier release such as 5.25.9, first read perl52510delta, which describes differences between 5.25.9 and 5.25.10.


This release includes two important updates:
  • Turning on the removal of "." in @INC
  • Providing a warning when "do" is used on a file in "."


Remove current dir (".") from @INC

For security reasons, @INC no longer contains the default directory (".").

Modules and Pragmata

Updated Modules and Pragmata

  • Compress::Raw::Bzip2 has been upgraded from version 2.070 to 2.074.
  • Compress::Raw::Zlib has been upgraded from version 2.070 to 2.074.
  • Config::Perl::V has been upgraded from version 0.27 to 0.28.
  • ExtUtils::ParseXS has been upgraded from version 3.33 to 3.34.
  • ExtUtils::Typemaps has been upgraded from version 3.33 to 3.34.
  • File::Spec has been upgraded from version 3.66 to 3.67.
  • Module::CoreList has been upgraded from version 5.20170220 to 5.20170320.
  • Pod::Perldoc has been upgraded from version 3.27 to 3.28.
  • Test::Harness has been upgraded from version 3.36_01 to 3.38.
  • threads has been upgraded from version 2.13 to 2.15.
  • threads::shared has been upgraded from version 1.54 to 1.55.
  • VMS::Stdio has been upgraded from version 2.42 to 2.41.


New Diagnostics

New Warnings
Since "." is removed from @INC, "do" will now trigger a warning recommending on fixing the "do" statement.

do "%s" failed, '.' is no longer in @INC

Configuration and Compilation

"DEFAULT_INC_EXCLUDES_DOT" has been turned on as default.

Selected Bug Fixes

" $-{$name} " would leak an "AV" on each access if the regular expression had no named captures. The same applies to access to any hash tied with Tie::Hash::NamedCapture and "all => 1". [perl #130822]


It is with great sadness we note that Kip Hampton passed away. Probably best known as the author of the Perl & XML column on, he was a core contributor to AxKit, an XML server platform that became an Apache Foundation project. He was a frequent speaker in the early days at OSCON, and most recently at YAPC::NA in Madison. He was frequently on as `ubu`, generally in the #axkit-dahut community, the group responsible for YAPC::NA Asheville in 2011.

Kip and his constant contributions to the community will be greatly missed.


Perl 5.25.11 represents approximately 4 weeks of development since Perl 5.25.10 and contains approximately 4,900 lines of changes across 240 files from 21 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 2,200 lines of changes to 170 .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 5.25.11:

Aaron Crane, Andy Lester, Chris 'BinGOs' Williams, Craig A. Berry, Dave Cross, David Golden, David Mitchell, Dominic Hargreaves, H.Merijn Brand, Hugo van der Sanden, James E Keenan, Jarkko Hietaniemi, Jerry D. Hedden, Karl Williamson, Leon Timmermans, Matthew Horsfall, Renee Baecker, Sawyer X, Shlomi Fish, Steve Hay, 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 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 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.

2017-05-20 perl v5.26.0