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perl5114delta (1)


perl5114delta - what is new for perl v5.11.4


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Perl Programmers Reference Guide                 PERL5114DELTA(1)

     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 component.

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

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:

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

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         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

         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.

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

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

Selected Bug Fixes
     o   Tie::Hash::NamedCapture::* shouldn't abort if passed bad
         input (RT #71828)

     o   @_ 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
         This new warning is issued when one attempts to mark a
         subroutine as lvalue after it has been defined.

Changed Internals
     o   Perl_magic_setmglob now knows about globs, fixing RT

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.

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         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 CPAN.

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     See attributes(5) for descriptions of the following

     |Availability   | runtime/perl-512 |
     |Stability      | Uncommitted      |
     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.

     This software was built from source available at  The original
     community source was downloaded from

     Further information about this software can be found on the
     open source community website at

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