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 v5.23.9
12 This document describes differences between the 5.23.8 release and the 5.23.9
15 If you are upgrading from an earlier release such as 5.23.7, first read
16 L<perl5238delta>, which describes differences between 5.23.7 and 5.23.8.
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 ]
50 XXX Any deprecated features, syntax, modules etc. should be listed here.
52 =head2 Module removals
54 XXX Remove this section if inapplicable.
56 The following modules will be removed from the core distribution in a
57 future release, and will at that time need to be installed from CPAN.
58 Distributions on CPAN which require these modules will need to list them as
61 The core versions of these modules will now issue C<"deprecated">-category
62 warnings to alert you to this fact. To silence these deprecation warnings,
63 install the modules in question from CPAN.
65 Note that these are (with rare exceptions) fine modules that you are encouraged
66 to continue to use. Their disinclusion from core primarily hinges on their
67 necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
68 not usually on concerns over their design.
74 XXX Note that deprecated modules should be listed here even if they are listed
75 as an updated module in the L</Modules and Pragmata> section.
79 [ List each other deprecation as a =head2 entry ]
81 =head1 Performance Enhancements
83 XXX Changes which enhance performance without changing behaviour go here.
84 There may well be none in a stable release.
86 [ List each enhancement as a =item entry ]
96 =head1 Modules and Pragmata
98 XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
99 go here. If Module::CoreList is updated, generate an initial draft of the
100 following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
101 for important changes should then be added by hand. In an ideal world,
102 dual-life modules would have a F<Changes> file that could be cribbed.
104 [ Within each section, list entries as a =item entry ]
106 =head2 New Modules and Pragmata
116 =head2 Updated Modules and Pragmata
122 L<XXX> has been upgraded from version A.xx to B.yy.
126 L<Module::CoreList> has been upgraded from version 5.20160121 to
131 =head2 Removed Modules and Pragmata
143 XXX Changes to files in F<pod/> go here. Consider grouping entries by
144 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
146 =head2 New Documentation
148 XXX Changes which create B<new> files in F<pod/> go here.
152 XXX Description of the purpose of the new file here
154 =head2 Changes to Existing Documentation
156 XXX Changes which significantly change existing files in F<pod/> go here.
157 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
166 XXX Description of the change here
172 The following additions or changes have been made to diagnostic output,
173 including warnings and fatal error messages. For the complete list of
174 diagnostic messages, see L<perldiag>.
176 XXX New or changed warnings emitted by the core's C<C> code go here. Also
177 include any changes in L<perldiag> that reconcile it to the C<C> code.
179 =head2 New Diagnostics
181 XXX Newly added diagnostic messages go under here, separated into New Errors
190 XXX L<message|perldiag/"message">
200 XXX L<message|perldiag/"message">
204 =head2 Changes to Existing Diagnostics
206 XXX Changes (i.e. rewording) of diagnostic messages go here
212 XXX Describe change here
216 =head1 Utility Changes
218 XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
219 Most of these are built within the directory F<utils>.
221 [ List utility changes as a =head2 entry for each utility and =item
222 entries for each change
223 Use L<XXX> with program names to get proper documentation linking. ]
235 =head1 Configuration and Compilation
237 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
238 go here. Any other changes to the Perl build process should be listed here.
239 However, any platform-specific changes should be listed in the
240 L</Platform Support> section, instead.
242 [ List changes as a =item entry ].
254 XXX Any significant changes to the testing of a freshly built perl should be
255 listed here. Changes which create B<new> files in F<t/> go here as do any
256 large changes to the testing harness (e.g. when parallel testing was added).
257 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
258 that they represent may be covered elsewhere.
260 [ List each test improvement as a =item entry ]
270 =head1 Platform Support
272 XXX Any changes to platform support should be listed in the sections below.
274 [ Within the sections, list each platform as a =item entry with specific
275 changes as paragraphs below it. ]
279 XXX List any platforms that this version of perl compiles on, that previous
280 versions did not. These will either be enabled by new files in the F<hints/>
281 directories, or new subdirectories and F<README> files at the top level of the
286 =item XXX-some-platform
292 =head2 Discontinued Platforms
294 XXX List any platforms that this version of perl no longer compiles on.
298 =item XXX-some-platform
304 =head2 Platform-Specific Notes
306 XXX List any changes for specific platforms. This could include configuration
307 and compilation changes or changes in portability/compatibility. However,
308 changes within modules for platforms should generally be listed in the
309 L</Modules and Pragmata> section.
313 =item XXX-some-platform
319 =head1 Internal Changes
321 XXX Changes which affect the interface available to C<XS> code go here. Other
322 significant internal changes for future core maintainers should be noted as
325 [ List each change as a =item entry ]
335 =head1 Selected Bug Fixes
337 XXX Important bug fixes in the core language are summarized here. Bug fixes in
338 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
340 [ List each fix as a =item entry ]
350 =head1 Known Problems
352 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
353 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
354 platform specific bugs also go here.
356 [ List each fix as a =item entry ]
366 =head1 Errata From Previous Releases
372 XXX Add anything here that we forgot to add, or were mistaken about, in
373 the perldelta of a previous release.
379 XXX If any significant core contributor has died, we've added a short obituary
382 =head1 Acknowledgements
384 XXX Generate this with:
386 perl Porting/acknowledgements.pl v5.23.8..HEAD
388 =head1 Reporting Bugs
390 If you find what you think is a bug, you might check the articles recently
391 posted to the comp.lang.perl.misc newsgroup and the perl bug database at
392 L<https://rt.perl.org/> . There may also be information at
393 L<http://www.perl.org/> , the Perl Home Page.
395 If you believe you have an unreported bug, please run the L<perlbug> program
396 included with your release. Be sure to trim your bug down to a tiny but
397 sufficient test case. Your bug report, along with the output of C<perl -V>,
398 will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
400 If the bug you are reporting has security implications, which make it
401 inappropriate to send to a publicly archived mailing list, then please send it
402 to perl5-security-report@perl.org. This points to a closed subscription
403 unarchived mailing list, which includes all the core committers, who will be
404 able to help assess the impact of issues, figure out a resolution, and help
405 co-ordinate the release of patches to mitigate or fix the problem across all
406 platforms on which Perl is supported. Please only use this address for
407 security issues in the Perl core, not for modules independently distributed on
412 The F<Changes> file for an explanation of how to view exhaustive details on
415 The F<INSTALL> file for how to build Perl.
417 The F<README> file for general stuff.
419 The F<Artistic> and F<Copying> files for copyright information.