5 [ this is a template for a new perldelta file. Any text flagged as XXX needs
6 to be processed before release. ]
8 perldelta - what is new for perl v5.31.3
12 This document describes differences between the 5.31.2 release and the 5.31.3
15 If you are upgrading from an earlier release such as 5.31.1, first read
16 L<perl5312delta>, which describes differences between 5.31.1 and 5.31.2.
20 XXX Any important notices here
22 =head1 Core Enhancements
24 XXX New core language features go here. Summarize user-visible core language
25 enhancements. Particularly prominent performance optimisations could go
26 here, but most should go in the L</Performance Enhancements> section.
28 [ List each enhancement as a =head2 entry ]
32 XXX Any security-related notices go here. In particular, any security
33 vulnerabilities closed should be noted here rather than in the
34 L</Selected Bug Fixes> section.
36 [ List each security issue as a =head2 entry ]
38 =head1 Incompatible Changes
40 XXX For a release on a stable branch, this section aspires to be:
42 There are no changes intentionally incompatible with 5.XXX.XXX
43 If any exist, they are bugs, and we request that you submit a
44 report. See L</Reporting Bugs> below.
46 [ List each incompatible change as a =head2 entry ]
48 =head2 Plain "0" string now treated as a number for range operator
50 Previously a range C< "0" .. "-1" > would produce a range of numeric
51 strings from "0" through "99", this now produces an empty list, just
54 This was due to a special case that treated strings starting with "0"
55 as strings so ranges like C< "00" .. "03" > produced C< "00", "01",
56 "02", "03" >, but didn't specially handle the string C<"0">.
60 =head2 C<\K> now disallowed in look-ahead and look-behind assertions
62 This was disallowed because it causes unexpected behaviour, and no-one
63 could define what the desired behaviour was.
69 XXX Any deprecated features, syntax, modules etc. should be listed here.
71 =head2 Module removals
73 XXX Remove this section if not applicable.
75 The following modules will be removed from the core distribution in a
76 future release, and will at that time need to be installed from CPAN.
77 Distributions on CPAN which require these modules will need to list them as
80 The core versions of these modules will now issue C<"deprecated">-category
81 warnings to alert you to this fact. To silence these deprecation warnings,
82 install the modules in question from CPAN.
84 Note that these are (with rare exceptions) fine modules that you are encouraged
85 to continue to use. Their disinclusion from core primarily hinges on their
86 necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
87 not usually on concerns over their design.
93 XXX Note that deprecated modules should be listed here even if they are listed
94 as an updated module in the L</Modules and Pragmata> section.
98 [ List each other deprecation as a =head2 entry ]
100 =head1 Performance Enhancements
102 XXX Changes which enhance performance without changing behaviour go here.
103 There may well be none in a stable release.
105 [ List each enhancement as an =item entry ]
115 =head1 Modules and Pragmata
117 XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
118 go here. If Module::CoreList is updated, generate an initial draft of the
119 following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
120 for important changes should then be added by hand. In an ideal world,
121 dual-life modules would have a F<Changes> file that could be cribbed.
123 The list of new and updated modules is modified automatically as part of
124 preparing a Perl release, so the only reason to manually add entries here is if
125 you're summarising the important changes in the module update. (Also, if the
126 manually-added details don't match the automatically-generated ones, the
127 release manager will have to investigate the situation carefully.)
129 [ Within each section, list entries as an =item entry ]
131 =head2 New Modules and Pragmata
137 XXX Remove this section if not applicable.
141 =head2 Updated Modules and Pragmata
147 L<Devel::PPPort> has been upgraded from version 3.54 to 3.55.
149 The test files generated on Win32 are now identical to when they are
150 generated on POSIX-like systems.
154 L<File::Find> has been upgraded from version 1.36 to 1.37.
156 On Win32, the tests no longer require either a file in the drive root
157 directory, or a writable root directory.
161 L<Thread> has been upgraded from version 3.04 to 3.05.
165 L<Getopt::Long> has been upgraded from version 2.50 to 2.51.
169 L<Time::HiRes> has been upgraded from version 1.9761 to 1.9762.
171 Removed obsolete code such as support for pre-5.6 perl and classic
172 MacOS. [perl #134288]
176 L<I18N::LangTags> has been upgraded from version 1.07 to 1.08.
178 Document the C<IGNORE_WIN32_LOCALE> environment variable.
182 L<XXX> has been upgraded from version A.xx to B.yy.
184 If there was something important to note about this change, include that here.
188 =head2 Removed Modules and Pragmata
200 XXX Changes to files in F<pod/> go here. Consider grouping entries by
201 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
203 =head2 New Documentation
205 XXX Changes which create B<new> files in F<pod/> go here.
209 XXX Description of the purpose of the new file here
211 =head2 Changes to Existing Documentation
213 We have attempted to update the documentation to reflect the changes
214 listed in this document. If you find any we have missed, send email
215 to L<perlbug@perl.org|mailto:perlbug@perl.org>.
217 XXX Changes which significantly change existing files in F<pod/> go here.
218 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
221 Additionally, the following selected changes have been made:
229 XXX Description of the change here
235 The following additions or changes have been made to diagnostic output,
236 including warnings and fatal error messages. For the complete list of
237 diagnostic messages, see L<perldiag>.
239 XXX New or changed warnings emitted by the core's C<C> code go here. Also
240 include any changes in L<perldiag> that reconcile it to the C<C> code.
242 =head2 New Diagnostics
244 XXX Newly added diagnostic messages go under here, separated into New Errors
253 XXX L<message|perldiag/"message">
263 XXX L<message|perldiag/"message">
267 =head2 Changes to Existing Diagnostics
269 XXX Changes (i.e. rewording) of diagnostic messages go here
275 XXX Describe change here
279 =head1 Utility Changes
281 XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
282 Most of these are built within the directory F<utils>.
284 [ List utility changes as a =head2 entry for each utility and =item
285 entries for each change
286 Use L<XXX> with program names to get proper documentation linking. ]
298 =head1 Configuration and Compilation
300 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
301 go here. Any other changes to the Perl build process should be listed here.
302 However, any platform-specific changes should be listed in the
303 L</Platform Support> section, instead.
305 [ List changes as an =item entry ].
317 XXX Any significant changes to the testing of a freshly built perl should be
318 listed here. Changes which create B<new> files in F<t/> go here as do any
319 large changes to the testing harness (e.g. when parallel testing was added).
320 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
321 that they represent may be covered elsewhere.
323 XXX If there were no significant test changes, say this:
325 Tests were added and changed to reflect the other additions and changes
328 XXX If instead there were significant changes, say this:
330 Tests were added and changed to reflect the other additions and
331 changes in this release. Furthermore, these significant changes were
334 [ List each test improvement as an =item entry ]
344 =head1 Platform Support
346 XXX Any changes to platform support should be listed in the sections below.
348 [ Within the sections, list each platform as an =item entry with specific
349 changes as paragraphs below it. ]
353 XXX List any platforms that this version of perl compiles on, that previous
354 versions did not. These will either be enabled by new files in the F<hints/>
355 directories, or new subdirectories and F<README> files at the top level of the
360 =item XXX-some-platform
366 =head2 Discontinued Platforms
368 XXX List any platforms that this version of perl no longer compiles on.
372 =item XXX-some-platform
378 =head2 Platform-Specific Notes
380 XXX List any changes for specific platforms. This could include configuration
381 and compilation changes or changes in portability/compatibility. However,
382 changes within modules for platforms should generally be listed in the
383 L</Modules and Pragmata> section.
389 F<t/op/magic.t> could fail if environment varables starting with
390 C<FOO> already existed.
394 =head1 Internal Changes
396 XXX Changes which affect the interface available to C<XS> code go here. Other
397 significant internal changes for future core maintainers should be noted as
400 [ List each change as an =item entry ]
406 A new parser function L<parse_subsignature()|perlapi/parse_subsignature>
407 allows a keyword plugin to parse a subroutine signature while C<use feature
408 'signatures'> is in effect. This allows custom keywords to implement
409 semantics similar to regular C<sub> declarations that include signatures.
414 Since on some platforms we need to hold a mutex when temporarily
415 switching locales, new macros (C<STORE_LC_NUMERIC_SET_TO_NEEDED_IN>,
416 C<WITH_LC_NUMERIC_SET_TO_NEEDED> and C<WITH_LC_NUMERIC_SET_TO_NEEDED_IN>)
417 have been added to make it easier to do this safely and efficiently
418 as part of [perl #134172].
422 =head1 Selected Bug Fixes
424 XXX Important bug fixes in the core language are summarized here. Bug fixes in
425 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
427 [ List each fix as an =item entry ]
433 C<< $@ = 100; die; >> now correctly propagates the 100 as an exception
434 instead of ignoring it. [perl #134291]
438 C<< 0 0x@ >> no longer asserts in S_no_op(). [perl #134310]
442 Exceptions thrown while C<$@> is read-only could result in infinite
443 recursion as perl tried to update C<$@>, which throws another
444 exception, resulting in a stack overflow. Perl now replaces C<$@>
445 with a copy if it's not a simple writable SV. [perl #134266]
449 =head1 Known Problems
451 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
452 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
453 platform specific bugs also go here.
455 [ List each fix as an =item entry ]
465 =head1 Errata From Previous Releases
471 XXX Add anything here that we forgot to add, or were mistaken about, in
472 the perldelta of a previous release.
478 XXX If any significant core contributor or member of the CPAN community has
479 died, add a short obituary here.
481 =head1 Acknowledgements
483 XXX Generate this with:
485 perl Porting/acknowledgements.pl v5.31.2..HEAD
487 =head1 Reporting Bugs
489 If you find what you think is a bug, you might check the perl bug database
490 at L<https://rt.perl.org/>. There may also be information at
491 L<http://www.perl.org/>, the Perl Home Page.
493 If you believe you have an unreported bug, please run the L<perlbug> program
494 included with your release. Be sure to trim your bug down to a tiny but
495 sufficient test case. Your bug report, along with the output of C<perl -V>,
496 will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
498 If the bug you are reporting has security implications which make it
499 inappropriate to send to a publicly archived mailing list, then see
500 L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
501 for details of how to report the issue.
505 If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
506 you can do so by running the C<perlthanks> program:
510 This will send an email to the Perl 5 Porters list with your show of thanks.
514 The F<Changes> file for an explanation of how to view exhaustive details on
517 The F<INSTALL> file for how to build Perl.
519 The F<README> file for general stuff.
521 The F<Artistic> and F<Copying> files for copyright information.