Ubuntu Manpage: perl5221delta - what is new for perl v5.22.1

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NAME

       perl5221delta - what is new for perl v5.22.1

DESCRIPTION

       This document describes differences between the 5.22.0 release and the 5.22.1 release.

       If you are upgrading from an earlier release such as 5.20.0, first read perl5220delta, which describes
       differences between 5.20.0 and 5.22.0.

Incompatible Changes

       There are no changes intentionally incompatible with 5.20.0 other than the following single exception,
       which we deemed to be a sensible change to make in order to get the new "\b{wb}" and (in particular)
       "\b{sb}" features sane before people decided they're worthless because of bugs in their Perl 5.22.0
       implementation and avoided them in the future.  If any others exist, they are bugs, and we request that
       you submit a report.  See "Reporting Bugs" below.

   Bounds Checking Constructs
       Several bugs, including a segmentation fault, have been fixed with the bounds checking constructs
       (introduced in Perl 5.22) "\b{gcb}", "\b{sb}", "\b{wb}", "\B{gcb}", "\B{sb}", and "\B{wb}".  All the
       "\B{}" ones now match an empty string; none of the "\b{}" ones do.  [perl #126319]
       <https://rt.perl.org/Ticket/Display.html?id=126319>

Modules and Pragmata

   Updated Modules and Pragmata
       •   Module::CoreList has been upgraded from version 5.20150520 to 5.20151213.

       •   PerlIO::scalar has been upgraded from version 0.22 to 0.23.

       •   POSIX has been upgraded from version 1.53 to 1.53_01.

           If  "POSIX::strerror"  was  passed $! as its argument then it accidentally cleared $!.  This has been
           fixed.  [perl #126229] <https://rt.perl.org/Ticket/Display.html?id=126229>

       •   Storable has been upgraded from version 2.53 to 2.53_01.

       •   warnings has been upgraded from version 1.32 to 1.34.

           The  "warnings::enabled"   example   now   actually   uses   "warnings::enabled".    [perl   #126051]
           <https://rt.perl.org/Ticket/Display.html?id=126051>

       •   Win32 has been upgraded from version 0.51 to 0.52.

           This has been updated for Windows 8.1, 10 and 2012 R2 Server.

Documentation

   Changes to Existing Documentation
       perltie

       •   The usage of "FIRSTKEY" and "NEXTKEY" has been clarified.

       perlvar

       •   The  specific  true  value of $!{E...} is now documented, noting that it is subject to change and not
           guaranteed.

Diagnostics

       The following additions or changes have been made to diagnostic  output,  including  warnings  and  fatal
       error messages.  For the complete list of diagnostic messages, see perldiag.

   Changes to Existing Diagnostics
       •   The  "printf"  and  "sprintf"  builtins  are  now more careful about the warnings they emit: argument
           reordering  now  disables  the  "redundant  argument"  warning  in   all   cases.    [perl   #125469]
           <https://rt.perl.org/Ticket/Display.html?id=125469>

Configuration and Compilation

       •   Using    the    "NO_HASH_SEED"    define   in   combination   with   the   default   hash   algorithm
           "PERL_HASH_FUNC_ONE_AT_A_TIME_HARD" resulted in a fatal error while compiling the interpreter,  since
           Perl 5.17.10.  This has been fixed.

       •   Configuring  with  ccflags containing quotes (e.g.  "-Accflags='-DAPPLLIB_EXP=\"/usr/libperl\"'") was
           broken    in    Perl    5.22.0    but    has    now    been    fixed    again.     [perl     #125314]
           <https://rt.perl.org/Ticket/Display.html?id=125314>

Platform Support

   Platform-Specific Notes
       IRIX
           •   Under  some circumstances IRIX stdio fgetc() and fread() set the errno to "ENOENT", which made no
               sense according to either IRIX or POSIX docs.   Errno  is  now  cleared  in  such  cases.   [perl
               #123977] <https://rt.perl.org/Ticket/Display.html?id=123977>

           •   Problems   when   multiplying   long  doubles  by  infinity  have  been  fixed.   [perl  #126396]
               <https://rt.perl.org/Ticket/Display.html?id=126396>

           •   All tests pass now on IRIX with the default build configuration.

Selected Bug Fixes

       •   "qr/(?[ () ])/" no  longer  segfaults,  giving  a  syntax  error  message  instead.   [perl  #125805]
           <https://rt.perl.org/Ticket/Display.html?id=125805>

       •   Regular  expression  possessive quantifier Perl 5.20 regression now fixed.  "qr/"PAT"{"min,max"}+""/"
           is supposed to behave identically to "qr/(?>"PAT"{"min,max"})/".  Since Perl 5.20, this  didn't  work
           if min and max were equal.  [perl #125825] <https://rt.perl.org/Ticket/Display.html?id=125825>

       •   Certain  syntax  errors  in  "Extended  Bracketed Character Classes" in perlrecharclass caused panics
           instead  of   the   proper   error   message.    This   has   now   been   fixed.    [perl   #126481]
           <https://rt.perl.org/Ticket/Display.html?id=126481>

       •   "BEGIN   <>"   no   longer  segfaults  and  properly  produces  an  error  message.   [perl  #125341]
           <https://rt.perl.org/Ticket/Display.html?id=125341>

       •   A regression from Perl 5.20 has been fixed, in which some  syntax  errors  in  "(?[...])"  constructs
           within  regular  expression patterns could cause a segfault instead of a proper error message.  [perl
           #126180] <https://rt.perl.org/Ticket/Display.html?id=126180>

       •   Another problem with "(?[...])"  constructs has been fixed wherein  things  like  "\c]"  could  cause
           panics.  [perl #126181] <https://rt.perl.org/Ticket/Display.html?id=126181>

       •   In  Perl  5.22.0,  the logic changed when parsing a numeric parameter to the -C option, such that the
           successfully parsed number was not saved as the option value if it parsed to the end of the argument.
           [perl #125381] <https://rt.perl.org/Ticket/Display.html?id=125381>

       •   Warning fatality is now ignored when rewinding the stack.  This prevents infinite recursion when  the
           now     fatal     error     also     causes    rewinding    of    the    stack.     [perl    #123398]
           <https://rt.perl.org/Ticket/Display.html?id=123398>

       •   A    crash     with     "%::=();     J->${\"::"}"     has     been     fixed.      [perl     #125541]
           <https://rt.perl.org/Ticket/Display.html?id=125541>

       •   Nested  quantifiers  such  as  "/.{1}??/"  should  cause  perl to throw a fatal error, but were being
           silently   accepted   since   Perl    5.20.0.     This    has    been    fixed.     [perl    #126253]
           <https://rt.perl.org/Ticket/Display.html?id=126253>

       •   Regular  expression  sequences  such  as  "/(?i/"  (and  similarly  with  other  recognized  flags or
           combination of flags) should cause perl to throw a fatal error,  but  were  being  silently  accepted
           since       Perl       5.18.0.        This       has       been      fixed.       [perl      #126178]
           <https://rt.perl.org/Ticket/Display.html?id=126178>

       •   A bug in hexadecimal floating point literal support meant that high-order bits could be lost in cases
           where mantissa overflow was caused by too many trailing zeros in the fractional part.  This has  been
           fixed.  [perl #126582] <https://rt.perl.org/Ticket/Display.html?id=126582>

       •   Another  hexadecimal  floating  point  bug, causing low-order bits to be lost in cases where the last
           hexadecimal digit of the mantissa has bits straddling the limit of the number of bits allowed for the
           mantissa, has also been fixed.  [perl #126586] <https://rt.perl.org/Ticket/Display.html?id=126586>

       •   Further hexadecimal floating point bugs have  been  fixed:  In  some  circumstances,  the  %a  format
           specifier  could  variously lose the sign of the negative zero, fail to display zeros after the radix
           point with the requested precision, or even lose the radix point after the leftmost hexadecimal digit
           completely.

       •   A crash caused by incomplete expressions within "/(?[ ])/" (e.g.  "/(?[[0]+()+])/") has  been  fixed.
           [perl #126615] <https://rt.perl.org/Ticket/Display.html?id=126615>

Acknowledgements

Perl 5.22.1 represents approximately 6 months of development since Perl 5.22.0 and contains approximately
19,000 lines of changes across 130 files from 27 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 1,700 lines of
changes to 44 .pm, .t, .c and .h files.

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 5.22.1:

Aaron Crane, Abigail, Andy Broad, Aristotle Pagaltzis, Chase Whitener, Chris 'BinGOs' Williams, Craig A.
Berry, Daniel Dragan, David Mitchell, Father Chrysostomos, Herbert Breunung, Hugo van der Sanden, James E
Keenan, Jan Dubois, Jarkko Hietaniemi, Karen Etheridge, Karl Williamson, Lukas Mai, Matthew Horsfall,
Peter Martini, Rafael Garcia-Suarez, Ricardo Signes, Shlomi Fish, Sisyphus, Steve Hay, Tony Cook, Victor
Adam.

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.

For a more complete list of all of Perl's historical contributors, please see the AUTHORS file in the
Perl source distribution.

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 https://rt.perl.org/ .  There may also be
       information at http://www.perl.org/ , 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 perlbug@perl.org 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 perl5-security-report@perl.org.  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.