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 The C<Unicode::Unihan> CPAN module doesn't work on recent Unicode
196 versions, so references to it have been removed.
202 The following additions or changes have been made to diagnostic output,
203 including warnings and fatal error messages. For the complete list of
204 diagnostic messages, see L<perldiag>.
206 XXX New or changed warnings emitted by the core's C<C> code go here. Also
207 include any changes in L<perldiag> that reconcile it to the C<C> code.
209 =head2 New Diagnostics
211 XXX Newly added diagnostic messages go under here, separated into New Errors
220 XXX L<message|perldiag/"message">
230 XXX L<message|perldiag/"message">
234 =head2 Changes to Existing Diagnostics
236 XXX Changes (i.e. rewording) of diagnostic messages go here
242 L<Can't modify %s in %s|perldiag/"Can't modify %s in %s">
243 (for scalar assignment to C<undef>)
245 Attempting to perform a scalar assignment to C<undef>, for example via
246 C<undef = $foo;>, previously triggered a fatal runtime error with the
247 message "L<Modification of a read-only value attempted|perldiag/"Modification of a read-only value attempted">."
248 It is more helpful to detect such attempted assignments prior to
249 runtime, so they are now compile time errors, resulting in the message
250 "Can't modify undef operator in scalar assignment".
254 XXX Describe change here
258 =head1 Utility Changes
260 XXX Changes to installed programs such as F<perldoc> and F<xsubpp> go here.
261 Most of these are built within the directory F<utils>.
263 [ List utility changes as a =head2 entry for each utility and =item
264 entries for each change
265 Use L<XXX> with program names to get proper documentation linking. ]
277 =head1 Configuration and Compilation
279 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
280 go here. Any other changes to the Perl build process should be listed here.
281 However, any platform-specific changes should be listed in the
282 L</Platform Support> section, instead.
284 [ List changes as an =item entry ].
296 XXX Any significant changes to the testing of a freshly built perl should be
297 listed here. Changes which create B<new> files in F<t/> go here as do any
298 large changes to the testing harness (e.g. when parallel testing was added).
299 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
300 that they represent may be covered elsewhere.
302 XXX If there were no significant test changes, say this:
304 Tests were added and changed to reflect the other additions and changes
307 XXX If instead there were significant changes, say this:
309 Tests were added and changed to reflect the other additions and
310 changes in this release. Furthermore, these significant changes were
313 [ List each test improvement as an =item entry ]
323 =head1 Platform Support
325 XXX Any changes to platform support should be listed in the sections below.
327 [ Within the sections, list each platform as an =item entry with specific
328 changes as paragraphs below it. ]
332 XXX List any platforms that this version of perl compiles on, that previous
333 versions did not. These will either be enabled by new files in the F<hints/>
334 directories, or new subdirectories and F<README> files at the top level of the
339 =item XXX-some-platform
345 =head2 Discontinued Platforms
347 XXX List any platforms that this version of perl no longer compiles on.
351 =item XXX-some-platform
357 =head2 Platform-Specific Notes
359 XXX List any changes for specific platforms. This could include configuration
360 and compilation changes or changes in portability/compatibility. However,
361 changes within modules for platforms should generally be listed in the
362 L</Modules and Pragmata> section.
366 =item XXX-some-platform
372 =head1 Internal Changes
378 Since the removal of PERL_OBJECT in Perl 5.8, PERL_IMPLICIT_CONTEXT and
379 MULTIPLICITY have been synonymous and they were being used interchangeably.
380 To simplify the code, all instances of PERL_IMPLICIT_CONTEXT have been
381 replaced with MULTIPLICITY.
383 PERL_IMPLICIT_CONTEXT will remain defined for compatibility with XS modules.
387 The definition for the C<ASSUME()> macro, broken on Windows in 5.34, has
392 =head1 Selected Bug Fixes
394 XXX Important bug fixes in the core language are summarized here. Bug fixes in
395 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
397 [ List each fix as an =item entry ]
403 utime() now correctly sets errno/C<$!> when called on a closed handle.
407 B::Deparse now correctly handles try/catch blocks with more complex scopes.
408 [L<GH #18874|https://github.com/Perl/perl5/issues/18874>]
412 =head1 Known Problems
414 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
415 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
416 platform specific bugs also go here.
418 [ List each fix as an =item entry ]
428 =head1 Errata From Previous Releases
434 XXX Add anything here that we forgot to add, or were mistaken about, in
435 the perldelta of a previous release.
441 Raun "Spider" Boardman (SPIDB on CPAN), author of at least 66 commits to the
442 Perl 5 core distribution between 1996 and 2002, passed away May 24 2021 from
443 complications of COVID. He will be missed.
445 =head1 Acknowledgements
447 XXX Generate this with:
449 perl Porting/acknowledgements.pl v5.35.0..HEAD
451 =head1 Reporting Bugs
453 If you find what you think is a bug, you might check the perl bug database
454 at L<https://github.com/Perl/perl5/issues>. There may also be information at
455 L<http://www.perl.org/>, the Perl Home Page.
457 If you believe you have an unreported bug, please open an issue at
458 L<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to a
459 tiny but sufficient test case.
461 If the bug you are reporting has security implications which make it
462 inappropriate to send to a public issue tracker, then see
463 L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
464 for details of how to report the issue.
468 If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
469 you can do so by running the C<perlthanks> program:
473 This will send an email to the Perl 5 Porters list with your show of thanks.
477 The F<Changes> file for an explanation of how to view exhaustive details on
480 The F<INSTALL> file for how to build Perl.
482 The F<README> file for general stuff.
484 The F<Artistic> and F<Copying> files for copyright information.