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       perl5133delta - what is new for perl v5.13.3


       This document describes differences between the 5.13.3 release and the 5.13.2 release.

       If you are upgrading from an earlier release such as 5.13.1, first read perl5132delta,
       which describes differences between 5.13.1 and 5.13.2.

Core Enhancements

   \o{...} for octals
       There is a new escape sequence, "\o", in double-quote-like contexts.  It must be followed
       by braces enclosing an octal number of at least one digit.  It interpolates as the
       character with an ordinal value equal to the octal number.  This construct allows large
       octal ordinals beyond the current max of 0777 to be represented.  It also allows you to
       specify a character in octal which can safely be concatenated with other regex snippets
       and which won't be confused with being a backreference to a regex capture group.  See
       "Capture groups" in perlre.

   "\N{name}" and "charnames" enhancements
       "\N{}" and "charnames::vianame" now know about the abbreviated character names listed by
       Unicode, such as NBSP, SHY, LRO, ZWJ, etc., as well as all the customary abbreviations for
       the C0 and C1 control characters (such as ACK, BEL, CAN, etc.), as well as a few new
       variants in common usage of some C1 full names.

       In the past, it was ineffective to override one of Perl's abbreviations with your own
       custom alias.  Now it works.

       You can also create a custom alias directly to the ordinal of a character, known by
       "\N{...}", "charnames::vianame()", and "charnames::viacode()".  Previously, an alias had
       to be to an official Unicode character name.  This made it impossible to create an alias
       for a code point that had no name, such as the ones reserved for private use.  So this
       change allows you to make more effective use of private use characters.  Only if there is
       no official name will "charnames::viacode()" return your custom one.

       See charnames for details on all these changes.

   Uppercase X/B allowed in hexadecimal/binary literals
       Literals may now use either upper case "0X..." or "0B..." prefixes, in addition to the
       already supported "0x..." and "0b..."  syntax. (RT#76296) (a674e8d, 333f87f)

       C, Ruby, Python and PHP already supported this syntax, and it makes Perl more internally
       consistent. A round-trip with "eval sprintf "%#X", 0x10" now returns 16 in addition to
       "eval sprintf "%#x", 0x10", which worked before.

Incompatible Changes

   \400 - \777
       Use of "\400" - "\777" in regexes in certain circumstances has given different, anomalous
       behavior than their use in all other double-quote-like contexts.   Since 5.10.1, a
       deprecated warning message has been raised when this happens.  Now, all double-quote-like
       contexts have the same behavior, namely to be equivalent to "\x{100}" - "\x{1FF}", with no
       deprecation warning. Use of these values in the command line option "-0" retains the
       current meaning to slurp input files whole; previously, this was documented only for
       "-0777".  It is recommended, however, because of various ambiguities, to use the new
       "\o{...}" construct to represent characters in octal.  (fa1639c..f6993e9).


   Omitting a space between a regular expression and subsequent word
       Omitting a space between a regex pattern or pattern modifiers and the following word is
       deprecated. Deprecation for regular expression matches was added in Perl 5.13.2.  In this
       release, the deprecation is extended to regular expression substitutions. For example,
       "s/foo/bar/sand $bar" will still be parsed as "s/foo/bar/s and $bar" but will issue a
       warning. (aa78b66)

   Deprecation warning added for deprecated-in-core .pl libs
       This is a mandatory warning, not obeying -X or lexical warning bits.  The warning is
       modelled on that supplied by for deprecated-in-core .pm libraries.  It points
       to the specific CPAN distribution that contains the .pl libraries. The CPAN version, of
       course, does not generate the warning. (0111154)

Performance Enhancements

       There are several small optimizations to reduce CPU cache misses in various very commonly
       used modules like "warnings" and "Carp" as well in accessing file-handles for reading.

Modules and Pragmata

   Updated Modules and Pragmata
           Upgraded from version 2.06_01 to 2.10.

           Upgraded from version 1.08 to 1.10.

           "viacode()" is now significantly faster. (f3227b7)

           Upgraded from version 0.62 to 0.63.

           Upgraded from version 1.77_02 to 1.77_03.

           Upgraded from version 1.33_01 to 1.33_02.

           Upgraded from version 1.09 to 1.10.

           Calling "use warnings" without arguments is now significantly more efficient.

           Upgraded from version 0.38 to 0.42.

           Updates since 0.38 include: a safe print method that guards Archive::Extract from
           changes to $\; a fix to the tests when run in core perl; support for TZ files; and a
           modification for the lzma logic to favour IO::Uncompress::Unlzma (d7f8799)

           Upgraded from version 1.54 to 1.64.

           Important changes since 1.54 include: compatibility with busybox implementations of
           tar; a fix so that "write()" and "create_archive()" close only handles they opened;
           and a bug was fixed regarding the exit code of extract_archive. (afabe0e)

           Upgraded from version 0.87 to 0.88.

           Upgraded from version 2.024 to 2.027.

           Upgraded from version 2.024 to 2.027_01.

           Upgraded from version 2.024 to 2.027.

           Upgraded from version 0.90 to 0.9007.

           Fixed the shell test to skip if test is not being run under a terminal; resolved the
           issue where a prereq on Config would not be recognised as a core module. (d4e225a)

           Upgraded from version 2.39 to 2.40.

           Upgraded from version 5.47 to 5.48.

           Upgraded from version 5.64_02 to 5.64_03.

           Exporter no longer overrides $SIG{__WARN__} (RT #74472) (9b86bb5)

           Upgraded from version 0.27 to 0.2703.

           Upgraded from version 1.57 to 1.58.

           Upgraded from version 2.2205 to 2.2206.

           Upgraded from version 2.19 to 2.20.

           Skips suid tests on a nosuid partition.  These tests were being skipped on OpenBSD,
           but nosuid partitions can exist on other systems too. Now it just checks if it can
           create a suid directory, if not the tests are skipped.  Perl builds without errors in
           a nosuid /tmp with this patch.  (cae9400)

           Upgraded from version 0.35 to 0.35_01.

           Upgraded from version 0.58 to 0.60.

           Upgraded from version 2.01 to 2.03.

           Upgraded from version 1.14 to 1.15.

           Locale::Maketext guts have been merged back into the main module (87d86da) and adds
           external cache support (ace47d6)

           Upgraded from version 0.3603 to 0.3607.

           Upgraded from version 2.34 to 2.36.

           Upgraded from version 0.16 to 0.18.

           Upgraded from version 2.02 to 3.00.

           Upgraded from version 3.17 to 3.21.

           The core update from Test-Harness 3.17 to 3.21 fixed some things, but also introduced
           a known problem with argument passing to non-Perl tests.

           Upgraded from version 1.9719 to 1.9721.

           Upgraded from version 1.15_01 to 1.20_01.

           Upgraded from version 0.52_01 to 0.53.

           Includes Unicode Collation Algorithm 18 (74b94a7)

           Upgraded from version 1.03 to 1.06.


   New Documentation

       The Perl 5.12.1 perldelta file was added from the Perl maintenance branch

   Changes to Existing Documentation
       General changes

       ·   Octal character escapes in documentation now prefer a three-digit octal escape or the
           new "\o{...}" escape as they have more consistent behavior in different contexts than
           other forms. (ce7b6f0) (d8b950d) (e1f120a)

       ·   Documentation now standardizes on the term 'capture group' over 'buffer' in regular
           expression documentation (c27a5cf)


       ·   Added cautionary note about "no VERSION" (e0de7c2)

       ·   Added additional notes regarding srand when forking (d460397)


       ·   Improved documentation of unusual character escapes (4068718, 9644846)

       ·   Clarified how hexadecimal escapes are interpreted, with particular attention to the
           treatment of invalid characters (9644846)


       ·   Clarified the behavior of the "-0NNN" switch for "-0400" or higher (7ba31cb)


       ·   Added the policy on compatibility and deprecation along with definitions of terms like
           "deprecation" (70e4a83)


       ·   Added examples of the perils of not using \g{} when there are more than nine back-
           references (9d86067)


       ·   Updated some examples for modern Perl style (67d00dd)

Utility Changes


       ·   The remote terminal works after forking and spawns new sessions - one for each forked
           process (11653f7)

       ·   Uses the less pager path from Config instead of searching for it (bf320d6)

Configuration and Compilation

       ·   Adjusted 'make test.valgrind' to account for cpan/dist/ext separation (e07ce2e)


       ·   t/harness clears PERL5LIB, PERLLIB, PERL5OPT as t/TEST does (a2d3de1)

       ·   Many common testing routines were refactored into t/lib/

       ·   Several test files have been modernized to use Test::More

Platform Support

   Discontinued Platforms
       MacOS Classic
           Support for MacOS Classic within ExtUtils::MakeMaker was removed from Perl in December
           2004.  Vestigial MacOS Classic specific code has now been removed from other core
           modules as well (8f8c2a4..c457df0)

   Platform-Specific Notes
           t/io/openpid.t now uses the alarm() watchdog strategy for more robustness (5732108)

Internal Changes

       ·   Under some circumstances, the "CvGV()" field of a CV is now reference counted. To
           ensure consistent behaviour, direct assignment to it, for example "CvGV(cv) = gv" is
           now a compile-time error. A new macro, "CvGV_set(cv,gv)" has been introduced to
           perform this operation safely.  Note that modification of this field is not part of of
           the public API, regardless of this new macro. This change caused some issues in
           modules that used the private "GvGV()" field.

       ·   It is now possible for XS code to hook into Perl's lexical scope mechanism at compile
           time, using the new "Perl_blockhook_register" function. See "Compile-time scope hooks"
           in perlguts.

       ·   Added "Perl_croak_no_modify()" to implement "Perl_croak("%s", PL_no_modify)" (6ad8f25)

       ·   Added prototypes for "tie()" and "untie()" to allow overloading (RT#75902) (1db4d19)

       ·   Adds "my_[l]stat_flags()" to replace "my_[l]stat()".  "my_stat()" and "my_lstat()"
           call get magic on the stack arg, so create "_flags()" variants that allow us to
           control this. (0d7d409)

Selected Bug Fixes

       ·   Some work has been done on the internal pointers that link between symbol tables
           (stashes), typeglobs and subroutines. This has the effect that various edge cases
           related to deleting stashes or stash entries (e.g.  <%FOO:: = ()>), and complex
           typeglob or code reference aliasing, will no longer crash the interpreter.

       ·   Fixed readline() when interrupted by signals so it no longer returns the "same thing"
           as before or random memory

       ·   Fixed a regression of kill() when a match variable is used for the process ID to kill
           (RT#75812) (8af710e)

       ·   Fixed several subtle bugs in sort() when @_ is accessed within a subroutine used for
           sorting (RT#72334) (8f443ca)

       ·   Catch yyparse() exceptions in "(?{...})" (RT#2353) (634d691)

       ·   Avoid UTF-8 cache panics with offsets beyond a string (RT #75898) (3e2d381)

       ·   Fixed POSIX::strftime memory leak (RT#73520) (c4bc4aa)

       ·   Doesn't set strict with "no VERSION" if "VERSION" is greater than 5.12 (da8fb5d)

       ·   Avoids multiple FETCH/stringify on filetest ops (40c852d)

       ·   Fixed issue with string "eval" not detecting taint of overloaded/tied arguments (RT
           #75716) (895b760)

       ·   Fix potential crashes of string "eval" when evaluating a object with overloaded
           stringification by creating a stringified copy when necessary (3e5c018)

       ·   Fixed bug where overloaded stringification could remove tainting (RT #75716) (a02ec77)

       ·   Plugs more memory leaks in vms.c. (9e2bec0)

       ·   Fix pthread include error for Time::Piece (e9f284c)

Known Problems

       ·   Bug fixes involving CvGV reference counting break Sub::Name.  A patch has been sent
           upstream to the maintainer

       ·   readline() returns an empty string instead of undef when it is interrupted by a signal

       ·   Test-Harness was updated from 3.17 to 3.21 for this release. A rewrite in how it
           handles non-Perl tests (in 3.17_01) broke argument passing to non-Perl tests with
           prove (RT #59186), and required that non-Perl tests be run as "prove ./"
           instead of "prove" These issues are being solved upstream, but didn't make it
           into this release.  They're expected to be fixed in time for perl v5.13.4.  (RT

       ·   "version" now prevents object methods from being called as class methods (d808b68)


       ·   Retroactively added the Acknowledgements list to perl5132delta, which was excluded in
           the original release (d1e2db0)


       Perl 5.13.3 represents approximately one month of development since Perl 5.13.2, and
       contains 12,184 lines of changes across 575 files from 104 authors and committers.

       Thank you to the following for contributing to this release:

       Abhijit Menon-Sen, Abigail, Alex Davies, Alex Vandiver, Alexandr Ciornii, Andreas J.
       Koenig, Andrew Rodland, Andy Dougherty, Aristotle Pagaltzis, Arkturuz, Ben Morrow, Bo
       Borgerson, Bo Lindbergh, Brad Gilbert, Bram, Brian Phillips, Chas. Owens, Chip Salzenberg,
       Chris Williams, Craig A. Berry, Curtis Jewell, Dan Dascalescu, Daniel Frederick Crisman,
       Dave Rolsky, David Caldwell, David E. Wheeler, David Golden, David Leadbeater, David
       Mitchell, Dennis Kaarsemaker, Eric Brine, Father Chrysostomos, Florian Ragwitz, Frank
       Wiegand, Gene Sullivan, George Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Graham Barr,
       H.Merijn Brand, Harmen, Hugo van der Sanden, James E Keenan, James Mastros, Jan Dubois,
       Jerry D. Hedden, Jesse Vincent, Jim Cromie, John Peacock, Jos Boumans, Josh ben Jore, Karl
       Williamson, Kevin Ryde, Leon Brocard, Lubomir Rintel, Maik Hentsche, Marcus Holland-
       Moritz, Matt Johnson, Matt S Trout, Max Maischein, Michael Breen, Michael G Schwern,
       Moritz Lenz, Nga Tang Chan, Nicholas Clark, Nick Cleaton, Nick Johnston, Niko Tyni, Offer
       Kaye, Paul Marquess, Philip Hazel, Philippe Bruhat, Rafael Garcia-Suarez, Rainer Tammer,
       Reini Urban, Ricardo Signes, Richard Soderberg, Robin Barker, Ruslan Zakirov, Salvador
       Fandino, Salvador Ortiz Garcia, Shlomi Fish, Sinan Unur, Sisyphus, Slaven Rezic, Steffen
       Mueller, Stepan Kasal, Steve Hay, Steve Peters, Sullivan Beck, Tim Bunce, Todd Rinaldo,
       Tom Christiansen, Tom Hukins, Tony Cook, Vincent Pit, Yuval Kogman, Yves Orton, Zefram,
       brian d foy, chromatic, kmx, var Arnfjoer` Bjarmason

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
       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 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.