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 v5.35.1
12 This document describes differences between the 5.35.0 release and the 5.35.1
15 If you are upgrading from an earlier release such as 5.34.0, first read
16 L<perl5350delta>, which describes differences between 5.34.0 and 5.35.0.
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 not applicable.
122 =head2 Updated Modules and Pragmata
128 L<File::Copy> has been upgraded from version 2.35 to 2.36.
130 Inode numbers are now compared as strings, so that large inode numbers
131 are correctly distinguished. (GH #18788)
135 L<IO> has been upgraded from version 1.46 to 1.47.
137 Implement sync() for win32.
141 L<PathTools|Cwd> has been upgraded from version 3.80 to 3.81.
143 Inodes numbers are now compared as strings, so that large inode numbers
144 are correctly distinguished. (GH #18788)
148 L<Unicode::Collate> has been upgraded from version 1.29 to 1.30.
150 One warning in F<mkheader> averted (rt.cpan.org #133952).
154 =head2 Removed Modules and Pragmata
166 XXX Changes to files in F<pod/> go here. Consider grouping entries by
167 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
169 =head2 New Documentation
171 XXX Changes which create B<new> files in F<pod/> go here.
175 XXX Description of the purpose of the new file here
177 =head2 Changes to Existing Documentation
179 We have attempted to update the documentation to reflect the changes
180 listed in this document. If you find any we have missed, open an issue
181 at L<https://github.com/Perl/perl5/issues>.
183 XXX Changes which significantly change existing files in F<pod/> go here.
184 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
187 Additionally, the following selected changes have been made:
195 XXX Description of the change here
201 The following additions or changes have been made to diagnostic output,
202 including warnings and fatal error messages. For the complete list of
203 diagnostic messages, see L<perldiag>.
205 XXX New or changed warnings emitted by the core's C<C> code go here. Also
206 include any changes in L<perldiag> that reconcile it to the C<C> code.
208 =head2 New Diagnostics
210 XXX Newly added diagnostic messages go under here, separated into New Errors
219 XXX L<message|perldiag/"message">
229 XXX L<message|perldiag/"message">
233 =head2 Changes to Existing Diagnostics
235 XXX Changes (i.e. rewording) of diagnostic messages go here
241 L<Can't modify %s in %s|perldiag/"Can't modify %s in %s">
242 (for scalar assignment to C<undef>)
244 Attempting to perform a scalar assignment to C<undef>, for example via
245 C<undef = $foo;>, previously triggered a fatal runtime error with the
246 message "L<Modification of a read-only value attempted|perldiag/"Modification of a read-only value attempted">."
247 It is more helpful to detect such attempted assignments prior to
248 runtime, so they are now compile time errors, resulting in the message
249 "Can't modify undef operator in scalar assignment".
253 XXX Describe change here
257 =head1 Utility Changes
259 XXX Changes to installed programs such as F<perldoc> and F<xsubpp> go here.
260 Most of these are built within the directory F<utils>.
262 [ List utility changes as a =head2 entry for each utility and =item
263 entries for each change
264 Use L<XXX> with program names to get proper documentation linking. ]
276 =head1 Configuration and Compilation
278 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
279 go here. Any other changes to the Perl build process should be listed here.
280 However, any platform-specific changes should be listed in the
281 L</Platform Support> section, instead.
283 [ List changes as an =item entry ].
295 XXX Any significant changes to the testing of a freshly built perl should be
296 listed here. Changes which create B<new> files in F<t/> go here as do any
297 large changes to the testing harness (e.g. when parallel testing was added).
298 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
299 that they represent may be covered elsewhere.
301 XXX If there were no significant test changes, say this:
303 Tests were added and changed to reflect the other additions and changes
306 XXX If instead there were significant changes, say this:
308 Tests were added and changed to reflect the other additions and
309 changes in this release. Furthermore, these significant changes were
312 [ List each test improvement as an =item entry ]
322 =head1 Platform Support
324 XXX Any changes to platform support should be listed in the sections below.
326 [ Within the sections, list each platform as an =item entry with specific
327 changes as paragraphs below it. ]
331 XXX List any platforms that this version of perl compiles on, that previous
332 versions did not. These will either be enabled by new files in the F<hints/>
333 directories, or new subdirectories and F<README> files at the top level of the
338 =item XXX-some-platform
344 =head2 Discontinued Platforms
346 XXX List any platforms that this version of perl no longer compiles on.
350 =item XXX-some-platform
356 =head2 Platform-Specific Notes
358 XXX List any changes for specific platforms. This could include configuration
359 and compilation changes or changes in portability/compatibility. However,
360 changes within modules for platforms should generally be listed in the
361 L</Modules and Pragmata> section.
365 =item XXX-some-platform
371 =head1 Internal Changes
377 Since the removal of PERL_OBJECT in Perl 5.8, PERL_IMPLICIT_CONTEXT and
378 MULTIPLICITY have been synonymous and they were being used interchangeably.
379 To simplify the code, all instances of PERL_IMPLICIT_CONTEXT have been
380 replaced with MULTIPLICITY.
382 PERL_IMPLICIT_CONTEXT will remain defined for compatibility with XS modules.
386 =head1 Selected Bug Fixes
388 XXX Important bug fixes in the core language are summarized here. Bug fixes in
389 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
391 [ List each fix as an =item entry ]
397 utime() now correctly sets errno/C<$!> when called on a closed handle.
401 =head1 Known Problems
403 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
404 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
405 platform specific bugs also go here.
407 [ List each fix as an =item entry ]
417 =head1 Errata From Previous Releases
423 XXX Add anything here that we forgot to add, or were mistaken about, in
424 the perldelta of a previous release.
430 Raun "Spider" Boardman (SPIDB on CPAN), author of at least 66 commits to the
431 Perl 5 core distribution between 1996 and 2002, passed away May 24 2021 from
432 complications of COVID. He will be missed.
434 =head1 Acknowledgements
436 XXX Generate this with:
438 perl Porting/acknowledgements.pl v5.35.0..HEAD
440 =head1 Reporting Bugs
442 If you find what you think is a bug, you might check the perl bug database
443 at L<https://github.com/Perl/perl5/issues>. There may also be information at
444 L<http://www.perl.org/>, the Perl Home Page.
446 If you believe you have an unreported bug, please open an issue at
447 L<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to a
448 tiny but sufficient test case.
450 If the bug you are reporting has security implications which make it
451 inappropriate to send to a public issue tracker, then see
452 L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
453 for details of how to report the issue.
457 If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
458 you can do so by running the C<perlthanks> program:
462 This will send an email to the Perl 5 Porters list with your show of thanks.
466 The F<Changes> file for an explanation of how to view exhaustive details on
469 The F<INSTALL> file for how to build Perl.
471 The F<README> file for general stuff.
473 The F<Artistic> and F<Copying> files for copyright information.