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 v5.39.0
12 This document describes differences between the 5.38.0 release and the 5.39.0
15 If you are upgrading from an earlier release such as 5.38.0, first read
16 L<perl5380delta>, which describes differences between 5.38.0 and 5.38.0.
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 not applicable.
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 an =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 The list of new and updated modules is modified automatically as part of
105 preparing a Perl release, so the only reason to manually add entries here is if
106 you're summarising the important changes in the module update. (Also, if the
107 manually-added details don't match the automatically-generated ones, the
108 release manager will have to investigate the situation carefully.)
110 [ Within each section, list entries as an =item entry ]
112 =head2 New Modules and Pragmata
118 XXX Remove this section if Porting/corelist-perldelta.pl did not add any content here.
122 =head2 Updated Modules and Pragmata
128 L<Errno> has been upgraded from version 1.37 to 1.38.
130 The C<osvers> and C<archname> baked into the module to ensure Errno is
131 loaded by the perl that built it are now more comprehensively
136 =head2 Removed Modules and Pragmata
142 XXX Remove this section if Porting/corelist-perldelta.pl did not add any content here.
148 XXX Changes to files in F<pod/> go here. Consider grouping entries by
149 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
151 =head2 New Documentation
153 XXX Changes which create B<new> files in F<pod/> go here.
157 XXX Description of the purpose of the new file here
159 =head2 Changes to Existing Documentation
161 We have attempted to update the documentation to reflect the changes
162 listed in this document. If you find any we have missed, open an issue
163 at L<https://github.com/Perl/perl5/issues>.
165 XXX Changes which significantly change existing files in F<pod/> go here.
166 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
169 Additionally, the following selected changes have been made:
177 XXX Description of the change here
183 The following additions or changes have been made to diagnostic output,
184 including warnings and fatal error messages. For the complete list of
185 diagnostic messages, see L<perldiag>.
187 XXX New or changed warnings emitted by the core's C<C> code go here. Also
188 include any changes in L<perldiag> that reconcile it to the C<C> code.
190 =head2 New Diagnostics
192 XXX Newly added diagnostic messages go under here, separated into New Errors
201 XXX L<message|perldiag/"message">
211 XXX L<message|perldiag/"message">
215 =head2 Changes to Existing Diagnostics
217 XXX Changes (i.e. rewording) of diagnostic messages go here
223 XXX Describe change here
227 =head1 Utility Changes
229 XXX Changes to installed programs such as F<perldoc> and F<xsubpp> go here.
230 Most of these are built within the directory F<utils>.
232 [ List utility changes as a =head2 entry for each utility and =item
233 entries for each change
234 Use L<XXX> with program names to get proper documentation linking. ]
246 =head1 Configuration and Compilation
248 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
249 go here. Any other changes to the Perl build process should be listed here.
250 However, any platform-specific changes should be listed in the
251 L</Platform Support> section, instead.
253 [ List changes as an =item entry ].
265 XXX Any significant changes to the testing of a freshly built perl should be
266 listed here. Changes which create B<new> files in F<t/> go here as do any
267 large changes to the testing harness (e.g. when parallel testing was added).
268 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
269 that they represent may be covered elsewhere.
271 XXX If there were no significant test changes, say this:
273 Tests were added and changed to reflect the other additions and changes
276 XXX If instead there were significant changes, say this:
278 Tests were added and changed to reflect the other additions and
279 changes in this release. Furthermore, these significant changes were
282 [ List each test improvement as an =item entry ]
292 =head1 Platform Support
294 XXX Any changes to platform support should be listed in the sections below.
296 [ Within the sections, list each platform as an =item entry with specific
297 changes as paragraphs below it. ]
301 XXX List any platforms that this version of perl compiles on, that previous
302 versions did not. These will either be enabled by new files in the F<hints/>
303 directories, or new subdirectories and F<README> files at the top level of the
308 =item XXX-some-platform
314 =head2 Discontinued Platforms
316 XXX List any platforms that this version of perl no longer compiles on.
320 =item XXX-some-platform
326 =head2 Platform-Specific Notes
328 XXX List any changes for specific platforms. This could include configuration
329 and compilation changes or changes in portability/compatibility. However,
330 changes within modules for platforms should generally be listed in the
331 L</Modules and Pragmata> section.
335 =item XXX-some-platform
341 =head1 Internal Changes
343 XXX Changes which affect the interface available to C<XS> code go here. Other
344 significant internal changes for future core maintainers should be noted as
347 [ List each change as an =item entry ]
357 =head1 Selected Bug Fixes
359 XXX Important bug fixes in the core language are summarized here. Bug fixes in
360 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
362 Include references to GitHub issues and PRs as: [GH #12345] and the release
363 manager will later use a regex to expand these into links.
365 [ List each fix as an =item entry ]
375 =head1 Known Problems
377 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
378 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
379 platform specific bugs also go here.
381 [ List each fix as an =item entry ]
391 =head1 Errata From Previous Releases
397 XXX Add anything here that we forgot to add, or were mistaken about, in
398 the perldelta of a previous release.
404 XXX If any significant core contributor or member of the CPAN community has
405 died, add a short obituary here.
407 =head1 Acknowledgements
409 XXX Generate this with:
411 perl Porting/acknowledgements.pl v5.37.12..HEAD
413 =head1 Reporting Bugs
415 If you find what you think is a bug, you might check the perl bug database
416 at L<https://github.com/Perl/perl5/issues>. There may also be information at
417 L<http://www.perl.org/>, the Perl Home Page.
419 If you believe you have an unreported bug, please open an issue at
420 L<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to a
421 tiny but sufficient test case.
423 If the bug you are reporting has security implications which make it
424 inappropriate to send to a public issue tracker, then see
425 L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
426 for details of how to report the issue.
430 If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
431 you can do so by running the C<perlthanks> program:
435 This will send an email to the Perl 5 Porters list with your show of thanks.
439 The F<Changes> file for an explanation of how to view exhaustive details on
442 The F<INSTALL> file for how to build Perl.
444 The F<README> file for general stuff.
446 The F<Artistic> and F<Copying> files for copyright information.