This document describes differences between the 5.18.0 release and the
       5.18.1 release.

       If you are upgrading from an earlier release such as 5.16.0, first read
       perl5180delta, which describes differences between 5.16.0 and 5.18.0.

Incompatible Changes
       There are no changes intentionally incompatible with 5.18.0 If any
       exist, they are bugs, and we request that you submit a report.  See
       "Reporting Bugs" below.

Modules and Pragmata
   Updated Modules and Pragmata
       o   B has been upgraded from 1.42 to 1.42_01, fixing bugs related to
           lexical subroutines.

       o   Digest::SHA has been upgraded from 5.84 to 5.84_01, fixing a
           crashing bug.  [RT #118649]

       o   Module::CoreList has been upgraded from 2.89 to 2.96.

Platform Support
   Platform-Specific Notes
       AIX A rarely-encounted configuration bug in the AIX hints file has been

           After a patch to the relevant hints file, perl should now build
           correctly on MidnightBSD 0.4-RELEASE.

Selected Bug Fixes
       o   Starting in v5.18.0, a construct like "/[#](?{})/x" would have its
           "#" incorrectly interpreted as a comment.  The code block would be
           skipped, unparsed.  This has been corrected.

       o   A number of memory leaks related to the new, experimental regexp
           bracketed character class feature have been plugged.

       o   The OP allocation code now returns correctly aligned memory in all
           cases for "struct pmop". Previously it could return memory only
           aligned to a 4-byte boundary, which is not correct for an ithreads
           build with 64 bit IVs on some 32 bit platforms. Notably, this
           caused the build to fail completely on sparc GNU/Linux. [RT

       o   The debugger's "man" command been fixed. It was broken in the
           v5.18.0 release. The "man" command is aliased to the names "doc"
           and "perldoc" - all now work again.

       o   @_ is now correctly visible in the debugger, fixing a regression
           introduced in v5.18.0's debugger. [RT #118169]

           rather than the string value. [RT #118159]

       o   Perl v5.18 inadvertently introduced a bug whereby interpolating
           mixed up- and down-graded UTF-8 strings in a regex could result in
           malformed UTF-8 in the pattern: specifically if a downgraded
           character in the range "\x80..\xff" followed a UTF-8 string, e.g.

               utf8::upgrade(  my $u = "\x{e5}");
               utf8::downgrade(my $d = "\x{e5}");

           [perl #118297].

       o   Lexical constants ("my sub a() { 42 }") no longer crash when

       o   Parameter prototypes attached to lexical subroutines are now
           respected when compiling sub calls without parentheses.
           Previously, the prototypes were honoured only for calls with
           parentheses. [RT #116735]

       o   Syntax errors in lexical subroutines in combination with calls to
           the same subroutines no longer cause crashes at compile time.

       o   The dtrace sub-entry probe now works with lexical subs, instead of
           crashing [perl #118305].

       o   Undefining an inlinable lexical subroutine ("my sub foo() { 42 }
           undef &foo") would result in a crash if warnings were turned on.

       o   Deep recursion warnings no longer crash lexical subroutines. [RT

       Perl 5.18.1 represents approximately 2 months of development since Perl
       5.18.0 and contains approximately 8,400 lines of changes across 60
       files from 12 authors.

       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 5.18.1:

       Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsaaker,
       David Mitchell, Father Chrysostomos, Karl Williamson, Lukas Mai,
       Nicholas Clark, Peter Martini, Ricardo Signes, Shlomi Fish, 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.
       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 will 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
       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.

perl v5.18.2                      2013-11-14                  PERL5181DELTA(1)
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