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

   "\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
       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.  (8452af9)

           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.

           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.

           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

   Changes to Existing Documentation
       General changes

       o   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)

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


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

       o   Added additional notes regarding srand when forking (d460397)


       o   Improved documentation of unusual character escapes (4068718,

       o   Clarified how hexadecimal escapes are interpreted, with particular

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


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

Utility Changes

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

       o   Uses the less pager path from Config instead of searching for it

Configuration and Compilation
       o   Adjusted 'make test.valgrind' to account for cpan/dist/ext
           separation (e07ce2e)

       o   t/harness clears PERL5LIB, PERLLIB, PERL5OPT as t/TEST does

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

       o   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

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

Internal Changes
       o   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.

       o   It is now possible for XS code to hook into Perl's lexical scope

Selected Bug Fixes
       o   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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

       o   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

       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 CPAN.

       The Changes file for an explanation of how to view exhaustive details
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