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 v5.19.3
12 This document describes differences between the 5.19.2 release and the 5.19.3
15 If you are upgrading from an earlier release such as 5.19.1, first read
16 L<perl5192delta>, which describes differences between 5.19.1 and 5.19.2.
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 ]
30 =head2 B<-F> now implies B<-a> and B<-a> implies B<-n>
32 Previously B<-F> without B<-a> was a no-op, and B<-a> without B<-n> or
33 B<-p> was a no-op, with this change, if you supply B<-F> then both
34 B<-a> and B<-n> are implied and if you supply B<-a> then B<-n> is implied.
36 You can still use B<-p> for its extra behaviour. [perl #116190]
40 XXX Any security-related notices go here. In particular, any security
41 vulnerabilities closed should be noted here rather than in the
42 L</Selected Bug Fixes> section.
44 [ List each security issue as a =head2 entry ]
46 =head1 Incompatible Changes
48 XXX For a release on a stable branch, this section aspires to be:
50 There are no changes intentionally incompatible with 5.XXX.XXX
51 If any exist, they are bugs, and we request that you submit a
52 report. See L</Reporting Bugs> below.
54 [ List each incompatible change as a =head2 entry ]
58 XXX Any deprecated features, syntax, modules etc. should be listed here.
60 =head2 Module removals
62 XXX Remove this section if inapplicable.
64 The following modules will be removed from the core distribution in a
65 future release, and will at that time need to be installed from CPAN.
66 Distributions on CPAN which require these modules will need to list them as
69 The core versions of these modules will now issue C<"deprecated">-category
70 warnings to alert you to this fact. To silence these deprecation warnings,
71 install the modules in question from CPAN.
73 Note that these are (with rare exceptions) fine modules that you are encouraged
74 to continue to use. Their disinclusion from core primarily hinges on their
75 necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
76 not usually on concerns over their design.
80 XXX Note that deprecated modules should be listed here even if they are listed
81 as an updated module in the L</Modules and Pragmata> section.
85 [ List each other deprecation as a =head2 entry ]
87 =head1 Performance Enhancements
89 XXX Changes which enhance performance without changing behaviour go here.
90 There may well be none in a stable release.
92 [ List each enhancement as a =item entry ]
102 =head1 Modules and Pragmata
104 XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
105 go here. If Module::CoreList is updated, generate an initial draft of the
106 following sections using F<Porting/corelist-perldelta.pl>, which prints stub
107 entries to STDOUT. Results can be pasted in place of the '=head2' entries
108 below. A paragraph summary for important changes should then be added by hand.
109 In an ideal world, dual-life modules would have a F<Changes> file that could be
112 [ Within each section, list entries as a =item entry ]
114 =head2 New Modules and Pragmata
124 =head2 Updated Modules and Pragmata
130 L<Data::Dumper> has been upgraded from version 2.147 to 2.148.
132 The compatbility of the XS implementation with the pure perl version
133 under C<Useqq> has been improved. [perl #118933]
137 L<Storable> has been upgraded from version 2.45 to 2.46.
139 Avoid creating temporary objects for STORABLE_attach when they aren't
140 required. [perl #118907]
144 L<bignum> has been upgraded from version 0.35 to 0.36.
146 L<bigrat> wasn't correctly updating an internal variable when C<use>d
147 with a C<lib> option.
151 =head2 Removed Modules and Pragmata
163 XXX Changes to files in F<pod/> go here. Consider grouping entries by
164 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
166 =head2 New Documentation
168 XXX Changes which create B<new> files in F<pod/> go here.
172 XXX Description of the purpose of the new file here
174 =head2 Changes to Existing Documentation
176 XXX Changes which significantly change existing files in F<pod/> go here.
177 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
180 =head3 L<perlopentut>
186 The C<open> tutorial has been completely rewriten by Tom Christiansen, and now
187 focuses on covering only the basics, rather than providing a comprehensive
188 reference to all things openable. This rewrite came as the result of a
189 vigorous discussion on perl5-porters kicked off by a set of improvements
190 written by Alexander Hartmaier to the existing C<perlopentut>. A "more than
191 you ever wanted to know about C<open>" document may follow in subsequent
198 The following additions or changes have been made to diagnostic output,
199 including warnings and fatal error messages. For the complete list of
200 diagnostic messages, see L<perldiag>.
202 XXX New or changed warnings emitted by the core's C<C> code go here. Also
203 include any changes in L<perldiag> that reconcile it to the C<C> code.
205 =head2 New Diagnostics
207 XXX Newly added diagnostic messages go under here, separated into New Errors
216 XXX L<message|perldiag/"message">
226 XXX L<message|perldiag/"message">
230 =head2 Changes to Existing Diagnostics
232 XXX Changes (i.e. rewording) of diagnostic messages go here
238 XXX Describe change here
242 =head1 Utility Changes
244 XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
245 Most of these are built within the directories F<utils> and F<x2p>.
247 [ List utility changes as a =head3 entry for each utility and =item
248 entries for each change
249 Use L<XXX> with program names to get proper documentation linking. ]
261 =head1 Configuration and Compilation
263 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
264 go here. Any other changes to the Perl build process should be listed here.
265 However, any platform-specific changes should be listed in the
266 L</Platform Support> section, instead.
268 [ List changes as a =item entry ].
280 XXX Any significant changes to the testing of a freshly built perl should be
281 listed here. Changes which create B<new> files in F<t/> go here as do any
282 large changes to the testing harness (e.g. when parallel testing was added).
283 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
284 that they represent may be covered elsewhere.
286 [ List each test improvement as a =item entry ]
296 =head1 Platform Support
298 XXX Any changes to platform support should be listed in the sections below.
300 [ Within the sections, list each platform as a =item entry with specific
301 changes as paragraphs below it. ]
305 XXX List any platforms that this version of perl compiles on, that previous
306 versions did not. These will either be enabled by new files in the F<hints/>
307 directories, or new subdirectories and F<README> files at the top level of the
312 =item XXX-some-platform
318 =head2 Discontinued Platforms
320 XXX List any platforms that this version of perl no longer compiles on.
324 =item XXX-some-platform
330 =head2 Platform-Specific Notes
332 XXX List any changes for specific platforms. This could include configuration
333 and compilation changes or changes in portability/compatibility. However,
334 changes within modules for platforms should generally be listed in the
335 L</Modules and Pragmata> section.
339 =item XXX-some-platform
345 =head1 Internal Changes
347 XXX Changes which affect the interface available to C<XS> code go here. Other
348 significant internal changes for future core maintainers should be noted as
351 [ List each change as a =item entry ]
361 =head1 Selected Bug Fixes
363 XXX Important bug fixes in the core language are summarized here. Bug fixes in
364 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
366 [ List each fix as a =item entry ]
376 =head1 Known Problems
378 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
379 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
380 platform specific bugs also go here.
382 [ List each fix as a =item entry ]
394 XXX If any significant core contributor has died, we've added a short obituary
397 =head1 Acknowledgements
399 XXX Generate this with:
401 perl Porting/acknowledgements.pl v5.19.2..HEAD
403 =head1 Reporting Bugs
405 If you find what you think is a bug, you might check the articles recently
406 posted to the comp.lang.perl.misc newsgroup and the perl bug database at
407 http://rt.perl.org/perlbug/ . There may also be information at
408 http://www.perl.org/ , the Perl Home Page.
410 If you believe you have an unreported bug, please run the L<perlbug> program
411 included with your release. Be sure to trim your bug down to a tiny but
412 sufficient test case. Your bug report, along with the output of C<perl -V>,
413 will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
415 If the bug you are reporting has security implications, which make it
416 inappropriate to send to a publicly archived mailing list, then please send it
417 to perl5-security-report@perl.org. This points to a closed subscription
418 unarchived mailing list, which includes all the core committers, who will be
419 able to help assess the impact of issues, figure out a resolution, and help
420 co-ordinate the release of patches to mitigate or fix the problem across all
421 platforms on which Perl is supported. Please only use this address for
422 security issues in the Perl core, not for modules independently distributed on
427 The F<Changes> file for an explanation of how to view exhaustive details on
430 The F<INSTALL> file for how to build Perl.
432 The F<README> file for general stuff.
434 The F<Artistic> and F<Copying> files for copyright information.