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1 | =encoding utf8 |
2 | ||
59773fc7 | 3 | =for comment |
3ad6135d | 4 | This has been completed up to dbe92b04c, except for 1b9f127-fad448f, which |
f295f417 | 5 | Karl Williamson says he will do. |
59773fc7 | 6 | |
3a5c9134 CBW |
7 | =head1 NAME |
8 | ||
9 | [ this is a template for a new perldelta file. Any text flagged as | |
10 | XXX needs to be processed before release. ] | |
11 | ||
12 | perldelta - what is new for perl v5.13.8 | |
13 | ||
14 | =head1 DESCRIPTION | |
15 | ||
16 | This document describes differences between the 5.13.8 release and | |
17 | the 5.13.7 release. | |
18 | ||
dbbe2d83 | 19 | If you are upgrading from an earlier release such as 5.13.6, first read |
3a5c9134 CBW |
20 | L<perl5137delta>, which describes differences between 5.13.6 and |
21 | 5.13.7. | |
22 | ||
23 | =head1 Notice | |
24 | ||
25 | XXX Any important notices here | |
26 | ||
27 | =head1 Core Enhancements | |
28 | ||
29 | XXX New core language features go here. Summarise user-visible core language | |
30 | enhancements. Particularly prominent performance optimisations could go | |
31 | here, but most should go in the L</Performance Enhancements> section. | |
32 | ||
33 | [ List each enhancement as a =head2 entry ] | |
34 | ||
b19934fb NC |
35 | =head2 C<-d:-foo> calls C<Devel::foo::unimport> |
36 | ||
37 | The syntax C<-dI<B<:>foo>> was extended in 5.6.1 to make C<-dI<:fooB<=bar>>> | |
6a8c8694 FC |
38 | equivalent to C<-MDevel::foo=bar>, which expands |
39 | internally to C<use Devel::foo 'bar';>. | |
b19934fb NC |
40 | F<perl> now allows prefixing the module name with C<->, with the same |
41 | semantics as C<-M>, I<i.e.> | |
42 | ||
43 | =over 4 | |
44 | ||
45 | =item C<-d:-foo> | |
46 | ||
6a8c8694 FC |
47 | Equivalent to C<-M-Devel::foo>, expands to |
48 | C<no Devel::foo;>, calls C<< Devel::foo->unimport() >> | |
b19934fb NC |
49 | if the method exists. |
50 | ||
51 | =item C<-d:-foo=bar> | |
52 | ||
6a8c8694 FC |
53 | Equivalent to C<-M-Devel::foo=bar>, expands to C<no Devel::foo 'bar';>, |
54 | calls C<< Devel::foo->unimport('bar') >> if the method exists. | |
b19934fb NC |
55 | |
56 | =back | |
57 | ||
58 | This is particularly useful to suppresses the default actions of a | |
59 | C<Devel::*> module's C<import> method whilst still loading it for debugging. | |
60 | ||
15e6cdd9 DG |
61 | =head2 Filehandle method calls load IO::File on demand |
62 | ||
63 | When a method call on a filehandle would die because the method can not | |
64 | be resolved and L<IO::File> has not been loaded, Perl now loads IO::File | |
65 | via C<require> and attempts method resolution again: | |
66 | ||
67 | open my $fh, ">", $file; | |
68 | $fh->binmode(":raw"); # loads IO::File and succeeds | |
69 | ||
70 | This also works for globs like STDOUT, STDERR and STDIN: | |
71 | ||
72 | STDOUT->autoflush(1); | |
73 | ||
74 | Because this on-demand load only happens if method resolution fails, the | |
75 | legacy approach of manually loading an IO::File parent class for partial | |
76 | method support still works as expected: | |
77 | ||
78 | use IO::Handle; | |
79 | open my $fh, ">", $file; | |
80 | $fh->autoflush(1); # IO::File not loaded | |
81 | ||
3a5c9134 CBW |
82 | =head1 Security |
83 | ||
84 | XXX Any security-related notices go here. In particular, any security | |
85 | vulnerabilities closed should be noted here rather than in the | |
86 | L</Selected Bug Fixes> section. | |
87 | ||
88 | [ List each security issue as a =head2 entry ] | |
89 | ||
90 | =head1 Incompatible Changes | |
91 | ||
2dc78664 | 92 | =head2 Attempting to use C<:=> as an empty attribute list is now a syntax error |
3a5c9134 | 93 | |
2dc78664 NC |
94 | Previously C<my $pi := 4;> was exactly equivalent to C<my $pi : = 4;>, |
95 | with the C<:> being treated as the start of an attribute list, ending before | |
96 | the C<=>. The use of C<:=> to mean C<: => was deprecated in 5.12.0, and is now | |
97 | a syntax error. This will allow the future use of C<:=> as a new token. | |
3a5c9134 | 98 | |
2dc78664 NC |
99 | We find no Perl 5 code on CPAN using this construction, outside the core's |
100 | tests for it, so we believe that this change will have very little impact on | |
101 | real-world codebases. | |
102 | ||
103 | If it is absolutely necessary to have empty attribute lists (for example, | |
baed7a72 NC |
104 | because of a code generator) then avoid the error by adding a space before |
105 | the C<=>. | |
3a5c9134 CBW |
106 | |
107 | =head1 Deprecations | |
108 | ||
109 | XXX Any deprecated features, syntax, modules etc. should be listed here. | |
110 | In particular, deprecated modules should be listed here even if they are | |
111 | listed as an updated module in the L</Modules and Pragmata> section. | |
112 | ||
113 | [ List each deprecation as a =head2 entry ] | |
114 | ||
59773fc7 FC |
115 | =head2 C<?PATTERN?> is deprecated |
116 | ||
117 | C<?PATTERN?> (without the initial m) has been deprecated and now produces | |
118 | a warning. | |
119 | ||
d59a8b3e NC |
120 | =head2 C<sv_compile_2op> is now deprecated |
121 | ||
122 | The C<sv_compile_2op> is now deprecated, and will be removed. Searches suggest | |
123 | that nothing on CPAN is using it, so this should have zero impact. | |
124 | ||
125 | It attempted to provide an API to compile code down to an optree, but failed | |
126 | to bind correctly to lexicals in the enclosing scope. It's not possible to | |
127 | fix this problem within the constraints of its parameters and return value. | |
128 | ||
3a5c9134 CBW |
129 | =head1 Performance Enhancements |
130 | ||
131 | XXX Changes which enhance performance without changing behaviour go here. There | |
132 | may well be none in a stable release. | |
133 | ||
134 | [ List each enhancement as a =item entry ] | |
135 | ||
136 | =over 4 | |
137 | ||
138 | =item * | |
139 | ||
140 | XXX | |
141 | ||
142 | =back | |
143 | ||
144 | =head1 Modules and Pragmata | |
145 | ||
146 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> | |
147 | go here. If Module::CoreList is updated, generate an initial draft of the | |
148 | following sections using F<Porting/corelist-perldelta.pl>, which prints stub | |
149 | entries to STDOUT. Results can be pasted in place of the '=head2' entries | |
150 | below. A paragraph summary for important changes should then be added by hand. | |
151 | In an ideal world, dual-life modules would have a F<Changes> file that could be | |
152 | cribbed. | |
153 | ||
154 | [ Within each section, list entries as a =item entry ] | |
155 | ||
156 | =head2 New Modules and Pragmata | |
157 | ||
158 | =over 4 | |
159 | ||
160 | =item * | |
161 | ||
162 | XXX | |
163 | ||
164 | =back | |
165 | ||
166 | =head2 Updated Modules and Pragmata | |
167 | ||
168 | =over 4 | |
169 | ||
170 | =item * | |
171 | ||
39b09a1b CBW |
172 | C<IPC::Cmd> has been upgraded from 0.64 to 0.66 |
173 | ||
174 | Resolves an issue with splitting Win32 command lines | |
175 | and documentation enhancements. | |
176 | ||
177 | =item * | |
178 | ||
28502098 FR |
179 | C<Memoize> has been upgraded from version 1.01_03 to 1.02. |
180 | ||
181 | =item * | |
182 | ||
37fa6334 | 183 | C<MIME::Base64> has been upgraded from 3.10 to 3.13 |
2456140e CBW |
184 | |
185 | Now provides encode_base64url and decode_base64url functions to process | |
186 | the base64 scheme for "URL applications". | |
187 | ||
188 | =item * | |
189 | ||
2638c0ff FC |
190 | C<overload> has been upgraded from 1.11 to 1.12. |
191 | ||
192 | =item * | |
193 | ||
194 | C<PerlIO::scalar> has been upgraded from 0.10 to 0.11. | |
195 | ||
196 | A C<read> after a C<seek> beyond the end of the string no longer thinks it | |
197 | has data to read | |
198 | L<[perl #78716]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78716>. | |
199 | ||
200 | =item * | |
201 | ||
f295f417 FC |
202 | C<re> has been upgraded from 0.14 to 0.15. |
203 | ||
204 | =item * | |
205 | ||
5ebfb99c | 206 | C<Socket> has been upgraded from 1.91 to 1.92. |
b373eab8 FC |
207 | |
208 | It has several new functions for handling IPv6 addresses. | |
209 | ||
210 | =item * | |
211 | ||
d4238815 FC |
212 | C<Time::HiRes> has been upgraded from 1.9721 to 1.9721_01. |
213 | ||
214 | =item * | |
215 | ||
68adb2b0 CBW |
216 | C<Unicode::Collate> has been upgraded from 0.67 to 0.68 |
217 | ||
218 | =item * | |
219 | ||
59773fc7 | 220 | C<Unicode::UCD> has been upgraded from 0.29 to 0.30. |
3a5c9134 | 221 | |
c2e0289e FC |
222 | =item * |
223 | ||
224 | C<version> has been upgraded from 0.82 to 0.86. | |
225 | ||
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226 | =back |
227 | ||
228 | =head2 Removed Modules and Pragmata | |
229 | ||
230 | =over 4 | |
231 | ||
232 | =item * | |
233 | ||
234 | XXX | |
235 | ||
236 | =back | |
237 | ||
238 | =head1 Documentation | |
239 | ||
240 | XXX Changes to files in F<pod/> go here. Consider grouping entries by | |
241 | file and be sure to link to the appropriate page, e.g. L<perlfunc>. | |
242 | ||
243 | =head2 New Documentation | |
244 | ||
245 | XXX Changes which create B<new> files in F<pod/> go here. | |
246 | ||
247 | =head3 L<XXX> | |
248 | ||
249 | XXX Description of the purpose of the new file here | |
250 | ||
251 | =head2 Changes to Existing Documentation | |
252 | ||
253 | XXX Changes which significantly change existing files in F<pod/> go here. | |
254 | However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics> | |
255 | section. | |
256 | ||
257 | =head3 L<XXX> | |
258 | ||
259 | =over 4 | |
260 | ||
261 | =item * | |
262 | ||
263 | XXX Description of the change here | |
264 | ||
265 | =back | |
266 | ||
267 | =head1 Diagnostics | |
268 | ||
269 | The following additions or changes have been made to diagnostic output, | |
270 | including warnings and fatal error messages. For the complete list of | |
271 | diagnostic messages, see L<perldiag>. | |
272 | ||
273 | XXX New or changed warnings emitted by the core's C<C> code go here. Also | |
274 | include any changes in L<perldiag> that reconcile it to the C<C> code. | |
275 | ||
276 | [ Within each section, list entries as a =item entry ] | |
277 | ||
278 | =head2 New Diagnostics | |
279 | ||
280 | XXX Newly added diagnostic messages go here | |
281 | ||
282 | =over 4 | |
283 | ||
284 | =item * | |
285 | ||
4d4ca6a5 | 286 | There is a new "Closure prototype called" error. |
3a5c9134 CBW |
287 | |
288 | =back | |
289 | ||
290 | =head2 Changes to Existing Diagnostics | |
291 | ||
292 | XXX Changes (i.e. rewording) of diagnostic messages go here | |
293 | ||
294 | =over 4 | |
295 | ||
296 | =item * | |
297 | ||
298 | XXX | |
299 | ||
300 | =back | |
301 | ||
302 | =head1 Utility Changes | |
303 | ||
304 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go | |
305 | here. Most of these are built within the directories F<utils> and F<x2p>. | |
306 | ||
307 | [ List utility changes as a =head3 entry for each utility and =item | |
308 | entries for each change | |
309 | Use L<XXX> with program names to get proper documentation linking. ] | |
310 | ||
311 | =head3 L<XXX> | |
312 | ||
313 | =over 4 | |
314 | ||
315 | =item * | |
316 | ||
317 | XXX | |
318 | ||
319 | =back | |
320 | ||
321 | =head1 Configuration and Compilation | |
322 | ||
323 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools | |
324 | go here. Any other changes to the Perl build process should be listed here. | |
325 | However, any platform-specific changes should be listed in the | |
326 | L</Platform Support> section, instead. | |
327 | ||
328 | [ List changes as a =item entry ]. | |
329 | ||
330 | =over 4 | |
331 | ||
332 | =item * | |
333 | ||
334 | XXX | |
335 | ||
336 | =back | |
337 | ||
338 | =head1 Testing | |
339 | ||
340 | XXX Any significant changes to the testing of a freshly built perl should be | |
341 | listed here. Changes which create B<new> files in F<t/> go here as do any | |
342 | large changes to the testing harness (e.g. when parallel testing was added). | |
343 | Changes to existing files in F<t/> aren't worth summarising, although the bugs | |
344 | that they represent may be covered elsewhere. | |
345 | ||
346 | [ List each test improvement as a =item entry ] | |
347 | ||
348 | =over 4 | |
349 | ||
350 | =item * | |
351 | ||
352 | XXX | |
353 | ||
354 | =back | |
355 | ||
356 | =head1 Platform Support | |
357 | ||
358 | XXX Any changes to platform support should be listed in the sections below. | |
359 | ||
360 | [ Within the sections, list each platform as a =item entry with specific | |
361 | changes as paragraphs below it. ] | |
362 | ||
363 | =head2 New Platforms | |
364 | ||
365 | XXX List any platforms that this version of perl compiles on, that previous | |
366 | versions did not. These will either be enabled by new files in the F<hints/> | |
367 | directories, or new subdirectories and F<README> files at the top level of the | |
368 | source tree. | |
369 | ||
370 | =over 4 | |
371 | ||
372 | =item XXX-some-platform | |
373 | ||
374 | XXX | |
375 | ||
376 | =back | |
377 | ||
378 | =head2 Discontinued Platforms | |
379 | ||
380 | XXX List any platforms that this version of perl no longer compiles on. | |
381 | ||
382 | =over 4 | |
383 | ||
384 | =item XXX-some-platform | |
385 | ||
386 | XXX | |
387 | ||
388 | =back | |
389 | ||
390 | =head2 Platform-Specific Notes | |
391 | ||
392 | XXX List any changes for specific platforms. This could include configuration | |
393 | and compilation changes or changes in portability/compatibility. However, | |
394 | changes within modules for platforms should generally be listed in the | |
395 | L</Modules and Pragmata> section. | |
396 | ||
397 | =over 4 | |
398 | ||
399 | =item XXX-some-platform | |
400 | ||
401 | XXX | |
402 | ||
403 | =back | |
404 | ||
405 | =head1 Internal Changes | |
406 | ||
407 | XXX Changes which affect the interface available to C<XS> code go here. | |
408 | Other significant internal changes for future core maintainers should | |
409 | be noted as well. | |
410 | ||
411 | [ List each test improvement as a =item entry ] | |
412 | ||
413 | =over 4 | |
414 | ||
415 | =item * | |
416 | ||
417 | XXX | |
418 | ||
419 | =back | |
420 | ||
421 | =head1 Selected Bug Fixes | |
422 | ||
423 | XXX Important bug fixes in the core language are summarised here. | |
424 | Bug fixes in files in F<ext/> and F<lib/> are best summarised in | |
425 | L</Modules and Pragmata>. | |
426 | ||
427 | [ List each fix as a =item entry ] | |
428 | ||
429 | =over 4 | |
430 | ||
431 | =item * | |
432 | ||
88e9444c NC |
433 | C<BEGIN {require 5.12.0}> now behaves as documented, rather than behaving |
434 | identically to C<use 5.12.0;>. Previously, C<require> in a C<BEGIN> block | |
435 | was erroneously executing the C<use feature ':5.12.0'> and | |
436 | C<use strict; use warnings;> behaviour, which only C<use> was documented to | |
b373eab8 FC |
437 | provide |
438 | L<[perl #69050]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=69050>. | |
439 | ||
440 | =item * | |
441 | ||
442 | C<use 5.42> | |
443 | L<[perl #69050]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=69050>, | |
444 | C<use 6> and C<no 5> no longer leak memory. | |
445 | ||
446 | =item * | |
447 | ||
448 | C<eval "BEGIN{die}"> no longer leaks memory on non-threaded builds. | |
3a5c9134 | 449 | |
1428a560 FC |
450 | =item * |
451 | ||
452 | PerlIO no longer crashes when called recursively, e.g., from a signal | |
453 | handler. Now it just leaks memory | |
454 | L<[perl #75556]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=75556>. | |
455 | ||
11cd2234 FC |
456 | =item * |
457 | ||
458 | Defining a constant with the same name as one of perl's special blocks | |
459 | (e.g., INIT) stopped working in 5.12.0, but has now been fixed | |
460 | L<[perl #78634]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78634>. | |
461 | ||
e3ef43a5 FC |
462 | =item * |
463 | ||
464 | A reference to a literal value used as a hash key (C<$hash{\"foo"}>) used | |
465 | to be stringified, even if the hash was tied | |
466 | L<[perl #79178]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=79178>. | |
467 | ||
3ad6135d FC |
468 | =item * |
469 | ||
470 | A number of bugs with regular expression bracketed character classes | |
471 | have been fixed, mostly having to do with matching characters in the | |
472 | non-ASCII Latin-1 range. | |
473 | ||
474 | =item * | |
475 | ||
476 | A closure containing an C<if> statement followed by a constant or variable | |
477 | is no longer treated as a constant | |
478 | L<[perl #63540]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=63540>. | |
479 | ||
4d4ca6a5 FC |
480 | =item * |
481 | ||
482 | Calling a closure prototype (what is passed to an attribute handler for a | |
483 | closure) now results in a "Closure prototype called" error message | |
484 | L<[perl #68560]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=68560>. | |
485 | ||
3a5c9134 CBW |
486 | =back |
487 | ||
488 | =head1 Known Problems | |
489 | ||
490 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any | |
491 | tests that had to be C<TODO>ed for the release would be noted here, unless | |
492 | they were specific to a particular platform (see below). | |
493 | ||
494 | This is a list of some significant unfixed bugs, which are regressions | |
495 | from either 5.XXX.XXX or 5.XXX.XXX. | |
496 | ||
497 | [ List each fix as a =item entry ] | |
498 | ||
499 | =over 4 | |
500 | ||
501 | =item * | |
502 | ||
3ad6135d | 503 | XXX |
3a5c9134 CBW |
504 | |
505 | =back | |
506 | ||
507 | =head1 Obituary | |
508 | ||
509 | XXX If any significant core contributor has died, we've added a short obituary | |
510 | here. | |
511 | ||
512 | =head1 Acknowledgements | |
513 | ||
514 | XXX The list of people to thank goes here. | |
515 | ||
516 | =head1 Reporting Bugs | |
517 | ||
518 | If you find what you think is a bug, you might check the articles | |
519 | recently posted to the comp.lang.perl.misc newsgroup and the perl | |
520 | bug database at http://rt.perl.org/perlbug/ . There may also be | |
521 | information at http://www.perl.org/ , the Perl Home Page. | |
522 | ||
523 | If you believe you have an unreported bug, please run the L<perlbug> | |
524 | program included with your release. Be sure to trim your bug down | |
525 | to a tiny but sufficient test case. Your bug report, along with the | |
526 | output of C<perl -V>, will be sent off to perlbug@perl.org to be | |
527 | analysed by the Perl porting team. | |
528 | ||
529 | If the bug you are reporting has security implications, which make it | |
530 | inappropriate to send to a publicly archived mailing list, then please send | |
531 | it to perl5-security-report@perl.org. This points to a closed subscription | |
532 | unarchived mailing list, which includes all the core committers, who be able | |
533 | to help assess the impact of issues, figure out a resolution, and help | |
534 | co-ordinate the release of patches to mitigate or fix the problem across all | |
535 | platforms on which Perl is supported. Please only use this address for | |
536 | security issues in the Perl core, not for modules independently | |
537 | distributed on CPAN. | |
538 | ||
539 | =head1 SEE ALSO | |
540 | ||
541 | The F<Changes> file for an explanation of how to view exhaustive details | |
542 | on what changed. | |
543 | ||
544 | The F<INSTALL> file for how to build Perl. | |
545 | ||
546 | The F<README> file for general stuff. | |
547 | ||
548 | The F<Artistic> and F<Copying> files for copyright information. | |
549 | ||
550 | =cut |