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44691e6f AB |
1 | =encoding utf8 |
2 | ||
3 | =head1 NAME | |
4 | ||
1e189079 EH |
5 | [ this is a template for a new perldelta file. Any text flagged as XXX needs |
6 | to be processed before release. ] | |
7 | ||
8 | perldelta - what is new for perl v5.27.2 | |
89853d76 | 9 | |
b5cbfe35 | 10 | =head1 DESCRIPTION |
89853d76 | 11 | |
1e189079 | 12 | This document describes differences between the 5.27.1 release and the 5.27.2 |
b5cbfe35 | 13 | release. |
89853d76 | 14 | |
1e189079 EH |
15 | If you are upgrading from an earlier release such as 5.27.0, first read |
16 | L<perl5271delta>, which describes differences between 5.27.0 and 5.27.1. | |
fbdbf2a7 | 17 | |
1e189079 | 18 | =head1 Notice |
fbdbf2a7 | 19 | |
1e189079 | 20 | XXX Any important notices here |
fbdbf2a7 | 21 | |
1e189079 | 22 | =head1 Core Enhancements |
fbdbf2a7 | 23 | |
1e189079 EH |
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. | |
fbdbf2a7 | 27 | |
1e189079 | 28 | [ List each enhancement as a =head2 entry ] |
fbdbf2a7 | 29 | |
a8b85d6c KW |
30 | =head2 Unicode 10.0 is supported |
31 | ||
32 | A list of changes is at | |
33 | L<http://www.unicode.org/versions/Unicode10.0.0>. | |
34 | ||
1e189079 | 35 | =head1 Security |
fbdbf2a7 | 36 | |
1e189079 EH |
37 | XXX Any security-related notices go here. In particular, any security |
38 | vulnerabilities closed should be noted here rather than in the | |
39 | L</Selected Bug Fixes> section. | |
fbdbf2a7 | 40 | |
1e189079 | 41 | [ List each security issue as a =head2 entry ] |
1b510166 S |
42 | |
43 | =head1 Incompatible Changes | |
44 | ||
1e189079 | 45 | XXX For a release on a stable branch, this section aspires to be: |
85cd139f | 46 | |
1e189079 EH |
47 | There are no changes intentionally incompatible with 5.XXX.XXX |
48 | If any exist, they are bugs, and we request that you submit a | |
49 | report. See L</Reporting Bugs> below. | |
be332ba0 | 50 | |
1e189079 | 51 | [ List each incompatible change as a =head2 entry ] |
be332ba0 | 52 | |
1e189079 | 53 | =head1 Deprecations |
489c16bf | 54 | |
1e189079 | 55 | XXX Any deprecated features, syntax, modules etc. should be listed here. |
489c16bf | 56 | |
1e189079 | 57 | =head2 Module removals |
c6e25b09 | 58 | |
1e189079 | 59 | XXX Remove this section if inapplicable. |
c6e25b09 | 60 | |
1e189079 EH |
61 | The following modules will be removed from the core distribution in a |
62 | future release, and will at that time need to be installed from CPAN. | |
63 | Distributions on CPAN which require these modules will need to list them as | |
64 | prerequisites. | |
520b6fb6 | 65 | |
1e189079 EH |
66 | The core versions of these modules will now issue C<"deprecated">-category |
67 | warnings to alert you to this fact. To silence these deprecation warnings, | |
68 | install the modules in question from CPAN. | |
520b6fb6 | 69 | |
1e189079 EH |
70 | Note that these are (with rare exceptions) fine modules that you are encouraged |
71 | to continue to use. Their disinclusion from core primarily hinges on their | |
72 | necessity to bootstrapping a fully functional, CPAN-capable Perl installation, | |
73 | not usually on concerns over their design. | |
02729eab | 74 | |
1e189079 | 75 | =over |
02729eab | 76 | |
1e189079 | 77 | =item XXX |
d0d6d4ce | 78 | |
1e189079 EH |
79 | XXX Note that deprecated modules should be listed here even if they are listed |
80 | as an updated module in the L</Modules and Pragmata> section. | |
d0d6d4ce | 81 | |
1e189079 | 82 | =back |
64278e8c | 83 | |
1e189079 | 84 | [ List each other deprecation as a =head2 entry ] |
64278e8c | 85 | |
1e189079 | 86 | =head1 Performance Enhancements |
5d09ee1c | 87 | |
1e189079 EH |
88 | XXX Changes which enhance performance without changing behaviour go here. |
89 | There may well be none in a stable release. | |
5d09ee1c | 90 | |
1e189079 | 91 | [ List each enhancement as a =item entry ] |
fd503f5c | 92 | |
1e189079 | 93 | =over 4 |
fd503f5c | 94 | |
1e189079 | 95 | =item * |
c8787424 | 96 | |
1e189079 | 97 | XXX |
c8787424 | 98 | |
1e189079 | 99 | =back |
9a4e033c | 100 | |
1e189079 | 101 | =head1 Modules and Pragmata |
9a4e033c | 102 | |
1e189079 EH |
103 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> |
104 | go here. If Module::CoreList is updated, generate an initial draft of the | |
105 | following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary | |
106 | for important changes should then be added by hand. In an ideal world, | |
107 | dual-life modules would have a F<Changes> file that could be cribbed. | |
1b510166 | 108 | |
1e189079 | 109 | [ Within each section, list entries as a =item entry ] |
315f3fc1 | 110 | |
1e189079 | 111 | =head2 New Modules and Pragmata |
315f3fc1 | 112 | |
1e189079 | 113 | =over 4 |
53fdf12a | 114 | |
1e189079 | 115 | =item * |
53fdf12a | 116 | |
1e189079 | 117 | XXX |
53fdf12a | 118 | |
1e189079 | 119 | =back |
53fdf12a | 120 | |
1e189079 | 121 | =head2 Updated Modules and Pragmata |
1b510166 | 122 | |
1b510166 S |
123 | =over 4 |
124 | ||
125 | =item * | |
126 | ||
1e189079 | 127 | L<XXX> has been upgraded from version A.xx to B.yy. |
9a4e033c | 128 | |
516aa7ad JK |
129 | =item * |
130 | ||
ba0219e6 Z |
131 | L<Carp> has been upgraded from version 1.42 to 1.43. |
132 | ||
133 | =item * | |
134 | ||
d912eab8 Z |
135 | L<Cwd> has been upgraded from version 3.67 to 3.68. |
136 | ||
137 | =item * | |
138 | ||
6baee08a | 139 | L<ExtUtils::CBuilder> has been upgraded from version 0.280225 to 0.280228. |
516aa7ad | 140 | |
af94b3ac Z |
141 | =item * |
142 | ||
143 | L<Time::HiRes> has been upgraded from version 1.9742 to 1.9743. | |
144 | ||
1b510166 | 145 | =back |
16beba24 | 146 | |
1e189079 | 147 | =head2 Removed Modules and Pragmata |
a049258c S |
148 | |
149 | =over 4 | |
fbe3f407 | 150 | |
759020c9 | 151 | =item * |
7ca0bfc4 | 152 | |
1e189079 | 153 | XXX |
1b510166 | 154 | |
1e189079 | 155 | =back |
9a4e033c | 156 | |
1e189079 | 157 | =head1 Documentation |
9a4e033c | 158 | |
1e189079 EH |
159 | XXX Changes to files in F<pod/> go here. Consider grouping entries by |
160 | file and be sure to link to the appropriate page, e.g. L<perlfunc>. | |
9a4e033c | 161 | |
1e189079 | 162 | =head2 New Documentation |
1b510166 | 163 | |
1e189079 | 164 | XXX Changes which create B<new> files in F<pod/> go here. |
1b510166 | 165 | |
1e189079 | 166 | =head3 L<XXX> |
1b510166 | 167 | |
1e189079 | 168 | XXX Description of the purpose of the new file here |
1b510166 | 169 | |
1e189079 | 170 | =head2 Changes to Existing Documentation |
1b510166 | 171 | |
1e189079 EH |
172 | We have attempted to update the documentation to reflect the changes |
173 | listed in this document. If you find any we have missed, send email | |
174 | to L<perlbug@perl.org|mailto:perlbug@perl.org>. | |
1b510166 | 175 | |
1e189079 EH |
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> | |
178 | section. | |
f717dc4d | 179 | |
1e189079 | 180 | Additionally, the following selected changes have been made: |
1b510166 | 181 | |
1e189079 | 182 | =head3 L<XXX> |
1b510166 | 183 | |
1e189079 | 184 | =over 4 |
a049258c | 185 | |
2c8edc25 | 186 | =item * |
d5c7a4fc | 187 | |
1e189079 | 188 | XXX Description of the change here |
a049258c | 189 | |
1e189079 | 190 | =back |
3abe9611 | 191 | |
1e189079 | 192 | =head1 Diagnostics |
1b510166 | 193 | |
1e189079 EH |
194 | The following additions or changes have been made to diagnostic output, |
195 | including warnings and fatal error messages. For the complete list of | |
196 | diagnostic messages, see L<perldiag>. | |
1b510166 | 197 | |
1e189079 EH |
198 | XXX New or changed warnings emitted by the core's C<C> code go here. Also |
199 | include any changes in L<perldiag> that reconcile it to the C<C> code. | |
1b510166 | 200 | |
1e189079 | 201 | =head2 New Diagnostics |
1b510166 | 202 | |
1e189079 EH |
203 | XXX Newly added diagnostic messages go under here, separated into New Errors |
204 | and New Warnings | |
1b510166 | 205 | |
1e189079 | 206 | =head3 New Errors |
1b510166 | 207 | |
1e189079 | 208 | =over 4 |
1b510166 S |
209 | |
210 | =item * | |
211 | ||
1e189079 | 212 | XXX L<message|perldiag/"message"> |
1b510166 | 213 | |
1e189079 | 214 | =back |
1b510166 | 215 | |
1e189079 EH |
216 | =head3 New Warnings |
217 | ||
218 | =over 4 | |
1b510166 S |
219 | |
220 | =item * | |
221 | ||
1e189079 | 222 | XXX L<message|perldiag/"message"> |
1b510166 | 223 | |
1e189079 | 224 | =back |
1b510166 | 225 | |
1e189079 | 226 | =head2 Changes to Existing Diagnostics |
1b510166 | 227 | |
1e189079 | 228 | XXX Changes (i.e. rewording) of diagnostic messages go here |
1b510166 | 229 | |
1e189079 | 230 | =over 4 |
1b510166 S |
231 | |
232 | =item * | |
233 | ||
1e189079 | 234 | XXX Describe change here |
1b510166 | 235 | |
1e189079 | 236 | =back |
0cc8c746 | 237 | |
1e189079 | 238 | =head1 Utility Changes |
0cc8c746 | 239 | |
1e189079 EH |
240 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here. |
241 | Most of these are built within the directory F<utils>. | |
0cc8c746 | 242 | |
1e189079 EH |
243 | [ List utility changes as a =head2 entry for each utility and =item |
244 | entries for each change | |
245 | Use L<XXX> with program names to get proper documentation linking. ] | |
0cc8c746 | 246 | |
1e189079 | 247 | =head2 L<XXX> |
0cc8c746 | 248 | |
1e189079 | 249 | =over 4 |
1b510166 S |
250 | |
251 | =item * | |
252 | ||
1e189079 | 253 | XXX |
1b510166 | 254 | |
1e189079 | 255 | =back |
1b510166 | 256 | |
1e189079 | 257 | =head1 Configuration and Compilation |
1b510166 | 258 | |
1e189079 EH |
259 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools |
260 | go here. Any other changes to the Perl build process should be listed here. | |
261 | However, any platform-specific changes should be listed in the | |
262 | L</Platform Support> section, instead. | |
263 | ||
264 | [ List changes as a =item entry ]. | |
1b510166 | 265 | |
1e189079 | 266 | =over 4 |
1b510166 S |
267 | |
268 | =item * | |
269 | ||
1e189079 | 270 | XXX |
1b510166 S |
271 | |
272 | =back | |
273 | ||
274 | =head1 Testing | |
275 | ||
1e189079 EH |
276 | XXX Any significant changes to the testing of a freshly built perl should be |
277 | listed here. Changes which create B<new> files in F<t/> go here as do any | |
278 | large changes to the testing harness (e.g. when parallel testing was added). | |
279 | Changes to existing files in F<t/> aren't worth summarizing, although the bugs | |
280 | that they represent may be covered elsewhere. | |
281 | ||
282 | XXX If there were no significant test changes, say this: | |
283 | ||
284 | Tests were added and changed to reflect the other additions and changes | |
285 | in this release. | |
286 | ||
287 | XXX If instead there were significant changes, say this: | |
288 | ||
f717dc4d KW |
289 | Tests were added and changed to reflect the other additions and |
290 | changes in this release. Furthermore, these significant changes were | |
291 | made: | |
1b510166 | 292 | |
1e189079 | 293 | [ List each test improvement as a =item entry ] |
1b510166 | 294 | |
1e189079 | 295 | =over 4 |
1b510166 | 296 | |
10b7d799 TC |
297 | =item * |
298 | ||
1e189079 | 299 | XXX |
10b7d799 | 300 | |
1b510166 S |
301 | =back |
302 | ||
303 | =head1 Platform Support | |
304 | ||
1e189079 | 305 | XXX Any changes to platform support should be listed in the sections below. |
1b510166 | 306 | |
1e189079 EH |
307 | [ Within the sections, list each platform as a =item entry with specific |
308 | changes as paragraphs below it. ] | |
309 | ||
310 | =head2 New Platforms | |
1b510166 | 311 | |
1e189079 EH |
312 | XXX List any platforms that this version of perl compiles on, that previous |
313 | versions did not. These will either be enabled by new files in the F<hints/> | |
314 | directories, or new subdirectories and F<README> files at the top level of the | |
315 | source tree. | |
1b510166 | 316 | |
d8efeb46 SH |
317 | =over 4 |
318 | ||
1e189079 | 319 | =item XXX-some-platform |
d8efeb46 | 320 | |
1e189079 | 321 | XXX |
d8efeb46 SH |
322 | |
323 | =back | |
1b510166 | 324 | |
1e189079 EH |
325 | =head2 Discontinued Platforms |
326 | ||
327 | XXX List any platforms that this version of perl no longer compiles on. | |
328 | ||
329 | =over 4 | |
330 | ||
331 | =item XXX-some-platform | |
332 | ||
333 | XXX | |
334 | ||
1b510166 S |
335 | =back |
336 | ||
1e189079 EH |
337 | =head2 Platform-Specific Notes |
338 | ||
339 | XXX List any changes for specific platforms. This could include configuration | |
340 | and compilation changes or changes in portability/compatibility. However, | |
341 | changes within modules for platforms should generally be listed in the | |
342 | L</Modules and Pragmata> section. | |
1b510166 | 343 | |
1b510166 S |
344 | =over 4 |
345 | ||
1e189079 | 346 | =item XXX-some-platform |
1b510166 | 347 | |
1e189079 | 348 | XXX |
1b510166 | 349 | |
1e189079 EH |
350 | =back |
351 | ||
352 | =head1 Internal Changes | |
353 | ||
354 | XXX Changes which affect the interface available to C<XS> code go here. Other | |
355 | significant internal changes for future core maintainers should be noted as | |
356 | well. | |
f566c7cf | 357 | |
1e189079 EH |
358 | [ List each change as a =item entry ] |
359 | ||
360 | =over 4 | |
f566c7cf | 361 | |
0cbf5865 KW |
362 | =item * |
363 | ||
1e189079 | 364 | XXX |
0cbf5865 | 365 | |
1b510166 S |
366 | =back |
367 | ||
368 | =head1 Selected Bug Fixes | |
369 | ||
1e189079 EH |
370 | XXX Important bug fixes in the core language are summarized here. Bug fixes in |
371 | files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>. | |
372 | ||
373 | [ List each fix as a =item entry ] | |
374 | ||
1b510166 S |
375 | =over 4 |
376 | ||
377 | =item * | |
378 | ||
43901c14 TC |
379 | List assignment (C<aassign>) could in some rare cases allocate an |
380 | entry on the mortal stack and leave the entry uninitialized. [perl | |
381 | #131570] | |
1b510166 | 382 | |
3072e759 TC |
383 | =item * |
384 | ||
385 | Attempting to apply an attribute to an C<our> variable where a | |
386 | function of that name already exists could result in a NULL pointer | |
387 | being supplied where an SV was expected, crashing perl. [perl | |
388 | #131597] | |
389 | ||
20ae58f7 AC |
390 | =item * |
391 | ||
392 | C<split ' '> now correctly handles the argument being split when in the | |
393 | scope of the L<< C<unicode_strings>|feature/"The 'unicode_strings' feature" | |
394 | >> feature. Previously, when a string using the single-byte internal | |
395 | representation contained characters that are whitespace by Unicode rules but | |
396 | not by ASCII rules, it treated those characters as part of fields rather | |
397 | than as field separators. [perl #130907] | |
398 | ||
ab9a6a63 AC |
399 | =item * |
400 | ||
401 | Several built-in functions previously had bugs that could cause them to | |
402 | write to the internal stack without allocating room for the item being | |
403 | written. In rare situations, this could have led to a crash. These bugs have | |
404 | now been fixed, and if any similar bugs are introduced in future, they will | |
405 | be detected automatically in debugging builds. | |
406 | ||
407 | =item * | |
408 | ||
409 | Using a symbolic ref with postderef syntax as the key in a hash lookup was | |
410 | yielding an assertion failure on debugging builds. [perl #131627] | |
411 | ||
412 | =item * | |
413 | ||
414 | Array and hash variables whose names begin with a caret now admit indexing | |
415 | inside their curlies when interpolated into strings, as in C<< | |
416 | "${^CAPTURE[0]}" >> to index C<@{^CAPTURE}>. [perl #131664] | |
417 | ||
1e189079 | 418 | =back |
9a4e033c | 419 | |
1e189079 | 420 | =head1 Known Problems |
9a4e033c | 421 | |
1e189079 EH |
422 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any |
423 | tests that had to be C<TODO>ed for the release would be noted here. Unfixed | |
424 | platform specific bugs also go here. | |
9a4e033c | 425 | |
1e189079 | 426 | [ List each fix as a =item entry ] |
9a4e033c | 427 | |
1e189079 EH |
428 | =over 4 |
429 | ||
430 | =item * | |
431 | ||
432 | XXX | |
9a4e033c | 433 | |
1b510166 S |
434 | =back |
435 | ||
1e189079 | 436 | =head1 Errata From Previous Releases |
1b510166 | 437 | |
1e189079 EH |
438 | =over 4 |
439 | ||
440 | =item * | |
1b510166 | 441 | |
1e189079 EH |
442 | XXX Add anything here that we forgot to add, or were mistaken about, in |
443 | the perldelta of a previous release. | |
1b510166 | 444 | |
1e189079 EH |
445 | =back |
446 | ||
447 | =head1 Obituary | |
1b510166 | 448 | |
1e189079 EH |
449 | XXX If any significant core contributor has died, we've added a short obituary |
450 | here. | |
1b510166 | 451 | |
1e189079 | 452 | =head1 Acknowledgements |
0cc8c746 | 453 | |
1e189079 | 454 | XXX Generate this with: |
2e0dcc12 | 455 | |
1e189079 | 456 | perl Porting/acknowledgements.pl v5.25.5..HEAD |
f5b73711 | 457 | |
44691e6f AB |
458 | =head1 Reporting Bugs |
459 | ||
b5cbfe35 S |
460 | If you find what you think is a bug, you might check the perl bug database |
461 | at L<https://rt.perl.org/> . There may also be information at | |
462 | L<http://www.perl.org/> , the Perl Home Page. | |
44691e6f | 463 | |
e08634c5 SH |
464 | If you believe you have an unreported bug, please run the L<perlbug> program |
465 | included with your release. Be sure to trim your bug down to a tiny but | |
466 | sufficient test case. Your bug report, along with the output of C<perl -V>, | |
b5cbfe35 | 467 | will be sent off to perlbug@perl.org to be analysed by the Perl porting team. |
44691e6f | 468 | |
87c118b9 DM |
469 | If the bug you are reporting has security implications which make it |
470 | inappropriate to send to a publicly archived mailing list, then see | |
c0ea3294 SH |
471 | L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION> |
472 | for details of how to report the issue. | |
44691e6f | 473 | |
390ae6f9 S |
474 | =head1 Give Thanks |
475 | ||
476 | If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, | |
477 | you can do so by running the C<perlthanks> program: | |
478 | ||
479 | perlthanks | |
480 | ||
481 | This will send an email to the Perl 5 Porters list with your show of thanks. | |
482 | ||
44691e6f AB |
483 | =head1 SEE ALSO |
484 | ||
e08634c5 SH |
485 | The F<Changes> file for an explanation of how to view exhaustive details on |
486 | what changed. | |
44691e6f AB |
487 | |
488 | The F<INSTALL> file for how to build Perl. | |
489 | ||
490 | The F<README> file for general stuff. | |
491 | ||
492 | The F<Artistic> and F<Copying> files for copyright information. | |
493 | ||
494 | =cut |