PERL5202DELTA(1) Perl Programmers Reference Guide PERL5202DELTA(1)

PERL5202DELTA(1) Perl Programmers Reference Guide PERL5202DELTA(1) #

PERL5202DELTA(1) Perl Programmers Reference Guide PERL5202DELTA(1)

NNAAMMEE #

 perl5202delta - what is new for perl v5.20.2

DDEESSCCRRIIPPTTIIOONN #

 This document describes differences between the 5.20.1 release and the
 5.20.2 release.

 If you are upgrading from an earlier release such as 5.20.0, first read
 perl5201delta, which describes differences between 5.20.0 and 5.20.1.

IInnccoommppaattiibbllee CChhaannggeess There are no changes intentionally incompatible with 5.20.1. If any exist, they are bugs, and we request that you submit a report. See “Reporting Bugs” below.

MMoodduulleess aanndd PPrraaggmmaattaa UUppddaatteedd MMoodduulleess aanndd PPrraaggmmaattaa • attributes has been upgraded from version 0.22 to 0.23.

     The usage of "memEQs" in the XS has been corrected.  [GH #14072]
     <https://github.com/Perl/perl5/issues/14072>

 •   Data::Dumper has been upgraded from version 2.151 to 2.151_01.

     Fixes CVE-2014-4330 by adding a configuration variable/option to
     limit recursion when dumping deep data structures.

 •   Errno has been upgraded from version 1.20_03 to 1.20_05.

     Warnings when building the XS on Windows with the Visual C++ compiler
     are now avoided.

 •   feature has been upgraded from version 1.36 to 1.36_01.

     The "postderef" feature has now been documented.  This feature was
     actually added in Perl 5.20.0 but was accidentally omitted from the
     feature documentation until now.

 •   IO::Socket has been upgraded from version 1.37 to 1.38.

     Document the limitations of the ccoonnnneecctteedd(()) method.  [GH #14199]
     <https://github.com/Perl/perl5/issues/14199>

 •   Module::CoreList has been upgraded from version 5.020001 to
     5.20150214.

     The list of Perl versions covered has been updated.

 •   PathTools has been upgraded from version 3.48 to 3.48_01.

     A warning from the ggcccc compiler is now avoided when building the XS.

 •   PerlIO::scalar has been upgraded from version 0.18 to 0.18_01.

     Reading from a position well past the end of the scalar now correctly
     returns end of file.  [GH #14342]
     <https://github.com/Perl/perl5/issues/14342>

     Seeking to a negative position still fails, but no longer leaves the
     file position set to a negation location.

     "eof()" on a "PerlIO::scalar" handle now properly returns true when
     the file position is past the 2GB mark on 32-bit systems.

 •   Storable has been upgraded from version 2.49 to 2.49_01.

     Minor grammatical change to the documentation only.

 •   VMS::DCLsym has been upgraded from version 1.05 to 1.05_01.

     Minor formatting change to the documentation only.

 •   VMS::Stdio has been upgraded from version 2.4 to 2.41.

     Minor formatting change to the documentation only.

DDooccuummeennttaattiioonn NNeeww DDooccuummeennttaattiioonn _p_e_r_l_u_n_i_c_o_o_k

 This document, by Tom Christiansen, provides examples of handling Unicode
 in Perl.

CChhaannggeess ttoo EExxiissttiinngg DDooccuummeennttaattiioonn _p_e_r_l_e_x_p_e_r_i_m_e_n_t

 •   Added reference to subroutine signatures.  This feature was actually
     added in Perl 5.20.0 but was accidentally omitted from the
     experimental feature documentation until now.

 _p_e_r_l_p_o_l_i_c_y

 •   The process whereby features may graduate from experimental status
     has now been formally documented.

 _p_e_r_l_s_y_n

 •   An ambiguity in the documentation of the ellipsis statement has been
     corrected.  [GH #14054] <https://github.com/Perl/perl5/issues/14054>

DDiiaaggnnoossttiiccss 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.

CChhaannggeess ttoo EExxiissttiinngg DDiiaaggnnoossttiiccss • Bad symbol for scalar is now documented. This error is not new, but was not previously documented here.

 •   Missing right brace on \N{} is now documented.  This error is not
     new, but was not previously documented here.

TTeessttiinngg • The test script _r_e_/_r_t_1_2_2_7_4_7_._t has been added to verify that [GH #14081] https://github.com/Perl/perl5/issues/14081 remains fixed.

PPllaattffoorrmm SSuuppppoorrtt RReeggaaiinneedd PPllaattffoorrmmss IRIX and Tru64 platforms are working again. (Some “make test” failures remain.)

SSeelleecctteedd BBuugg FFiixxeess • AIX now sets the length in “getsockopt” correctly. [GH #13484] https://github.com/Perl/perl5/issues/13484, [cpan #91183] https://rt.cpan.org/Ticket/Display.html?id=91183, [cpan #85570] https://rt.cpan.org/Ticket/Display.html?id=85570

 •   In Perl 5.20.0, $^N accidentally had the internal UTF8 flag turned
     off if accessed from a code block within a regular expression,
     effectively UTF8-encoding the value.  This has been fixed.  [GH
     #14211] <https://github.com/Perl/perl5/issues/14211>

 •   Various cases where the name of a sub is used (autoload, overloading,
     error messages) used to crash for lexical subs, but have been fixed.

 •   An assertion failure when parsing "sort" with debugging enabled has
     been fixed.  [GH #14087] <https://github.com/Perl/perl5/issues/14087>

 •   Loading UTF8 tables during a regular expression match could cause
     assertion failures under debugging builds if the previous match used
     the very same regular expression.  [GH #14081]
     <https://github.com/Perl/perl5/issues/14081>

 •   Due to a mistake in the string-copying logic, copying the value of a
     state variable could instead steal the value and undefine the
     variable.  This bug, introduced in Perl 5.20, would happen mostly for
     long strings (1250 chars or more), but could happen for any strings
     under builds with copy-on-write disabled.  [GH #14175]
     <https://github.com/Perl/perl5/issues/14175>

 •   Fixed a bug that could cause perl to execute an infinite loop during
     compilation.  [GH #14165]
     <https://github.com/Perl/perl5/issues/14165>

 •   On Win32, restoring in a child pseudo-process a variable that was
     "local()"ed in a parent pseudo-process before the "fork" happened
     caused memory corruption and a crash in the child pseudo-process (and
     therefore OS process).  [GH #8641]
     <https://github.com/Perl/perl5/issues/8641>

 •   Tainted constants evaluated at compile time no longer cause unrelated
     statements to become tainted.  [GH #14059]
     <https://github.com/Perl/perl5/issues/14059>

 •   Calling "write" on a format with a "^**" field could produce a panic
     in ssvv__cchhoopp(()) if there were insufficient arguments or if the variable
     used to fill the field was empty.  [GH #14255]
     <https://github.com/Perl/perl5/issues/14255>

 •   In Perl 5.20.0, "sort CORE::fake" where 'fake' is anything other than
     a keyword started chopping of the last 6 characters and treating the
     result as a sort sub name.  The previous behaviour of treating
     "CORE::fake" as a sort sub name has been restored.  [GH #14323]
     <https://github.com/Perl/perl5/issues/14323>

 •   A bug in regular expression patterns that could lead to segfaults and
     other crashes has been fixed.  This occurred only in patterns
     compiled with "/i", while taking into account the current POSIX
     locale (this usually means they have to be compiled within the scope
     of "use locale"), and there must be a string of at least 128
     consecutive bytes to match.  [GH #14389]
     <https://github.com/Perl/perl5/issues/14389>

 •   "qr/@array(?{block})/" no longer dies with "Bizarre copy of ARRAY".
     [GH #14292] <https://github.com/Perl/perl5/issues/14292>

 •   "gmtime" no longer crashes with not-a-number values.  [GH #14365]
     <https://github.com/Perl/perl5/issues/14365>

 •   Certain syntax errors in substitutions, such as "s/${<>{})//", would
     crash, and had done so since Perl 5.10.  (In some cases the crash did
     not start happening until Perl 5.16.)  The crash has, of course, been
     fixed.  [GH #14391] <https://github.com/Perl/perl5/issues/14391>

 •   A memory leak in some regular expressions, introduced in Perl 5.20.1,
     has been fixed.  [GH #14236]
     <https://github.com/Perl/perl5/issues/14236>

 •   "formline("@...", "a");" would crash.  The "FF_CHECKNL" case in
     pppp__ffoorrmmlliinnee(()) didn't set the pointer used to mark the chop position,
     which led to the "FF_MORE" case crashing with a segmentation fault.
     This has been fixed.  [GH #14388]
     <https://github.com/Perl/perl5/issues/14388> [GH #14425]
     <https://github.com/Perl/perl5/issues/14425>

 •   A possible buffer overrun and crash when parsing a literal pattern
     during regular expression compilation has been fixed.  [GH #14416]
     <https://github.com/Perl/perl5/issues/14416>

KKnnoowwnn PPrroobblleemmss • It is a known bug that lexical subroutines cannot be used as the “SUBNAME” argument to “sort”. This will be fixed in a future version of Perl.

EErrrraattaa FFrroomm PPrreevviioouuss RReelleeaasseess • A regression has been fixed that was introduced in Perl 5.20.0 (fixed in Perl 5.20.1 as well as here) in which a UTF-8 encoded regular expression pattern that contains a single ASCII lowercase letter does not match its uppercase counterpart. [GH #14051] https://github.com/Perl/perl5/issues/14051

AAcckknnoowwlleeddggeemmeennttss Perl 5.20.2 represents approximately 5 months of development since Perl 5.20.1 and contains approximately 6,300 lines of changes across 170 files from 34 authors.

 Excluding auto-generated files, documentation and release tools, there
 were approximately 1,900 lines of changes to 80 .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 5.20.2:

 Aaron Crane, Abigail, Andreas Voegele, Andy Dougherty, Anthony Heading,
 Aristotle Pagaltzis, Chris 'BinGOs' Williams, Craig A. Berry, Daniel
 Dragan, Doug Bell, Ed J, Father Chrysostomos, Glenn D. Golden, H.Merijn
 Brand, Hugo van der Sanden, James E Keenan, Jarkko Hietaniemi, Jim
 Cromie, Karen Etheridge, Karl Williamson, kmx, Matthew Horsfall, Max
 Maischein, Peter Martini, Rafael Garcia-Suarez, Ricardo Signes, Shlomi
 Fish, Slaven Rezic, Steffen Müller, Steve Hay, Tadeusz Sośnierz, Tony
 Cook, Yves Orton, Ævar Arnfjörð Bjarmason.

 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 _A_U_T_H_O_R_S file in the Perl source distribution.

RReeppoorrttiinngg BBuuggss 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.

SSEEEE AALLSSOO #

 The _C_h_a_n_g_e_s file for an explanation of how to view exhaustive details on
 what changed.

 The _I_N_S_T_A_L_L file for how to build Perl.

 The _R_E_A_D_M_E file for general stuff.

 The _A_r_t_i_s_t_i_c and _C_o_p_y_i_n_g files for copyright information.

perl v5.36.3 2023-02-15 PERL5202DELTA(1)