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       perl5114delta - what is new for perl v5.11.4


       This document describes differences between the 5.11.3 release and the 5.11.4 release.

       If you are upgrading from an earlier release such as 5.11.2, first read perl5113delta,
       which describes differences between 5.11.2 and 5.11.3.

Incompatible Changes

   Version number formats
       Acceptable version number formats have been formalized into "strict" and "lax" rules.
       "package NAME VERSION" takes a strict version number.  "use NAME VERSION" takes a lax
       version number.  "UNIVERSAL::VERSION" and the version object constructors take lax version
       numbers.  Providing an invalid version will result in a fatal error.

       These formats will be documented fully in the version module in a subsequent release of
       Perl 5.11.  To a first approximation, a "strict" version number is a positive decimal
       number (integer or decimal-fraction) without exponentiation or else a dotted-decimal
       v-string with a leading 'v' character and at least three components.  A "lax" version
       number allows v-strings with fewer than three components or without a leading 'v'.  Under
       "lax" rules, both decimal and dotted-decimal versions may have a trailing "alpha"
       component separated by an underscore character after a fractional or dotted-decimal

       The version module adds "version::is_strict" and "version::is_lax" functions to check a
       scalar against these rules.

Core Enhancements

   Unicode properties
       "\p{XDigit}" now matches the same characters as "\p{Hex_Digit}".  This means that in
       addition to the characters it currently matches, "[A-Fa-f0-9]", it will also match their
       fullwidth equivalent forms, for example U+FF10: FULLWIDTH DIGIT ZERO.

Modules and Pragmata

   Pragmata Changes
           Upgraded from version 0.02 to 0.03.

           This version introduces the "stash_name" method to allow subclasses of less to pick
           where in %^H to store their stash.

           Upgraded from version 0.77 to 0.81.

           This version adds support for "Version number formats" as described earlier in this
           document and in its own documentation.

           Upgraded from version 1.08 to 1.09.

           This version adds the "illegalproto" warning category.  See also "New or Changed
           Diagnostics" for this change.

   Updated Modules
           Upgraded from version 0.36 to 0.38.

           Upgraded from version 0.93 to 0.94.

           Upgraded from version 2.021 to 2.024.

           Upgraded from version 2.021 to 2.024.

           Upgraded from version 1.94_5301 to 1.94_54.

           Upgraded from version 0.22 to 0.24.

           Upgraded from version 0.36 to 0.3603.

           Upgraded from version 2.20 to 2.21.

           Anonymous coderefs created in Safe containers no longer get bogus arguments passed to
           them, fixing RT #72068.

   Removed Modules and Pragmata
           Removed from the Perl core.  Prior version was 'undef'.

Changes to Existing Documentation

       A significant fraction of the core documentation has been updated to clarify the behavior
       of Perl's Unicode handling.

       Much of the remaining core documentation has been reviewed and edited for clarity,
       consistent use of language, and to fix the spelling of Tom Christiansen's name.

   Configuration improvements
       USE_ATTRIBUTES_FOR_PERLIO is now reported in the compile-time options listed by the "-V"

   Platform Specific Changes
       VMS The default pipe buffer size on VMS has been updated to 8192 on 64-bit systems.

Selected Bug Fixes

       ·   Tie::Hash::NamedCapture::* shouldn't abort if passed bad input (RT #71828)

       ·   @_ and $_ no longer leak under threads (RT #34342 and #41138, also #70602, #70974)

New or Changed Diagnostics

       New warning category "illegalproto"
           The two warnings :

             Illegal character in prototype for %s : %s
             Prototype after '%c' for %s : %s

           have been moved from the "syntax" top-level warnings category into a new first-level
           category, "illegalproto". These two warnings are currently the only ones emitted
           during parsing of an invalid/illegal prototype, so one can now do

             no warnings 'illegalproto';

           to suppress only those, but not other syntax-related warnings. Warnings where
           prototypes are changed, ignored, or not met are still in the "prototype" category as
           before. (Matt S. Trout)

       lvalue attribute ignored after the subroutine has been defined
           This new warning is issued when one attempts to mark a subroutine as lvalue after it
           has been defined.

Changed Internals

       ·   Perl_magic_setmglob now knows about globs, fixing RT #71254.

Known Problems

       Perl 5.11.4 is a development release leading up to Perl 5.12.0.  Some notable known
       problems found in 5.11.4 are listed as dependencies of RT #69710, the Perl 5 version 12


       The following items are now deprecated.

           The method "UNIVERSAL->import()" is now deprecated.  Attempting to pass import
           arguments to a "use UNIVERSAL" statement will result in a deprecation warning. (This
           is a less noisy version of the full deprecation warning added in 5.11.0.)


       Perl 5.11.4 represents approximately one month of development since Perl 5.11.3 and
       contains 17682 lines of changes across 318 files from 40 authors and committers:

       Abigail, Andy Dougherty, brian d foy, Chris Williams, Craig A. Berry, David Golden, David
       Mitchell, Father Chrysostomos, Gerard Goossen, H.Merijn Brand, Jesse Vincent, Jim Cromie,
       Josh ben Jore, Karl Williamson, kmx, Matt S Trout, Nicholas Clark, Niko Tyni, Paul
       Marquess, Philip Hazel, Rafael Garcia-Suarez, Rainer Tammer, Reini Urban, Ricardo Signes,
       Shlomi Fish, Tim Bunce, Todd Rinaldo, Tom Christiansen, Tony Cook, Vincent Pit, and Zefram

       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.

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 <>.
       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
       analyzed 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 please send it to This points to a closed subscription unarchived mailing
       list, which includes all the core committers, who be able to help assess the impact of
       issues, figure out a resolution, and help co-ordinate the release of patches to mitigate
       or fix the problem across all platforms on which Perl is supported. Please only use this
       address for security issues in the Perl core, not for modules independently distributed on


       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.