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Describe the update to Pod::Functions in perldelta.
[perl5.git] / pod / perldelta.pod
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1=encoding utf8
2
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c0f37554 4This has been completed up to 0aae26c14, except for:
10c62b23 5803e389 rurban CYG17 utf8 paths
ff4ff6f3 6d9298c1 rurban mymalloc isn't thread safe
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8=head1 NAME
9
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10[ this is a template for a new perldelta file. Any text flagged as
11XXX needs to be processed before release. ]
ad32999b 12
c1e74734 13perldelta - what is new for perl v5.15.8
88c5c971 14
c1e74734 15=head1 DESCRIPTION
8f12b018 16
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17This document describes differences between the 5.15.7 release and
18the 5.15.8 release.
8f12b018 19
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20If you are upgrading from an earlier release such as 5.15.6, first read
21L<perl5157delta>, which describes differences between 5.15.6 and
225.15.7.
26afcec5 23
c1e74734 24=head1 Notice
8f12b018 25
c1e74734 26XXX Any important notices here
d7fbd56d 27
c1e74734 28=head1 Core Enhancements
d7fbd56d 29
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30XXX New core language features go here. Summarise user-visible core language
31enhancements. Particularly prominent performance optimisations could go
32here, but most should go in the L</Performance Enhancements> section.
d7fbd56d 33
c1e74734 34[ List each enhancement as a =head2 entry ]
711a3903 35
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36=head2 Improved ability to mix locales and Unicode, including UTF-8 locales
37
38An optional parameter has been added to C<use locale>
39
40 use locale ':not_characters';
41
42which tells Perl to use all but the C<LC_CTYPE> and C<LC_COLLATE>
43portions of the current locale. Instead, the character set is assumed
44to be Unicode. This allows locales and Unicode to be seamlessly mixed,
45including the increasingly frequent UTF-8 locales. When using this
46hybrid form of locales, the C<:locale> layer to the L<open> pragma can
47be used to interface with the file system, and there are CPAN modules
48available for ARGV and environment variable conversions.
49
50Full details are in L<perllocale>.
51
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52=head2 New function C<fc> and corresponding escape sequence C<\F> for Unicode foldcase
53
54Unicode foldcase is an extension to lowercase that gives better results
55when comparing two strings case-insensitively. It has long been used
56internally in regular expression C</i> matching. Now it is available
57explicitly through the new C<fc> function call (enabled by
58S<C<"use feature 'fc'">>, or C<use v5.16>, or explicitly callable via
249950d7 59C<CORE::fc>) or through the new C<\F> sequence in double-quotish
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60strings.
61
62Full details are in L<perlfunc/fc>.
63
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64=head2 C<_> in subroutine prototypes
65
66The C<_> character in subroutine prototypes is now allowed before C<@> or
67C<%>.
68
74968535 69=head2 Supports (I<almost>) Unicode 6.1
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70
71Besides the addition of whole new scripts, and new characters in
72existing scripts, this new version of Unicode, as always, makes some
73changes to existing characters. One change that may trip up some
74applications is that the General Category of two characters in the
75Latin-1 range, PILCROW SIGN and SECTION SIGN, has been changed from
76Other_Symbol to Other_Punctuation. The same change has been made for
77a character in each of Tibetan, Ethiopic, and Aegean.
78The code points U+3248..U+324F (CIRCLED NUMBER TEN ON BLACK SQUARE
79through CIRCLED NUMBER EIGHTY ON BLACK SQUARE) have had their General
80Category changed from Other_Symbol to Other_Numeric. The Line Break
81property has changes for Hebrew and Japanese; and as a consequence of
82other changes in 6.1, the Perl regular expression construct C<\X> now
83works differently for some characters in Thai and Lao.
84
85New aliases (synonyms) have been defined for many property values;
86these, along with the previously existing ones, are all cross indexed in
87L<perluniprops>.
88
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89The return value of C<charnames::viacode()> is affected by other
90changes:
91
92 Code point Old Name New Name
93 U+000A LINE FEED (LF) LINE FEED
94 U+000C FORM FEED (FF) FORM FEED
95 U+000D CARRIAGE RETURN (CR) CARRIAGE RETURN
96 U+0085 NEXT LINE (NEL) NEXT LINE
97 U+008E SINGLE-SHIFT 2 SINGLE-SHIFT-2
98 U+008F SINGLE-SHIFT 3 SINGLE-SHIFT-3
99 U+0091 PRIVATE USE 1 PRIVATE USE-1
100 U+0092 PRIVATE USE 2 PRIVATE USE-2
101 U+2118 SCRIPT CAPITAL P WEIERSTRASS ELLIPTIC FUNCTION
102
103Perl will accept any of these names as input, but
104C<charnames::viacode()> now returns the new name of each pair. The
105change for U+2118 is considered by Unicode to be a correction, that is
106the original name was a mistake (but again, it will remain forever valid
107to use it to refer to U+2118). But most of these changes are the
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108fallout of the mistake Unicode 6.0 made in naming a character used in
109Japanese cell phones to be "BELL", which conflicts with the long
110standing industry use of (and Unicode's recommendation to use) that name
111to mean the ASCII control character at U+0007. As a result, that name
112has been deprecated in Perl since v5.14; and any use of it will raise a
113warning message (unless turned off). The name "ALERT" is now the
114preferred name for this code point, with "BEL" being an acceptable short
115form. The name for the new cell phone character, at code point U+1F514,
116remains undefined in this version of Perl (hence we don't quite
117implement all of Unicode 6.1), but starting in v5.18, BELL will mean
118this character, and not U+0007.
119
120Unicode has taken steps to make sure that this sort of mistake does not
121happen again. The Standard now includes all the generally accepted
122names and abbreviations for control characters, whereas previously it
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123didn't (though there were recommended names for most of them, which Perl
124used). This means that most of those recommended names are now
125officially in the Standard. Unicode did not recommend names for the
126four code points listed above between U+008E and U+008F, and in
127standardizing them Unicode subtly changed the names that Perl had
128previously given them, by replacing the final blank in each name by a
129hyphen. Unicode also officially accepts names that Perl had deprecated,
130such as FILE SEPARATOR. Now the only deprecated name is BELL.
131Finally, Perl now uses the new official names instead of the old
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132(now considered obsolete) names for the first four code points in the
133list above (the ones which have the parentheses in them).
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134
135Now that the names have been placed in the Unicode standard, these kinds
136of changes should not happen again, though corrections, such as to
137U+2118, are still possible.
138
139Unicode also added some name abbreviations, which Perl now accepts:
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140SP for SPACE;
141TAB for CHARACTER TABULATION;
142NEW LINE, END OF LINE, NL, and EOL for LINE FEED;
143LOCKING-SHIFT ONE for SHIFT OUT;
144LOCKING-SHIFT ZERO for SHIFT IN;
145and ZWNBSP for ZERO WIDTH NO-BREAK SPACE.
146
147More details on this version of Unicode are provided in
148L<http://www.unicode.org/versions/Unicode6.1.0/>.
149
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150=head2 Added C<is_utf8_char_buf()>
151
152This function is designed to replace the deprecated L</is_utf8_char()>
153function. It includes an extra parameter to make sure it doesn't read
154past the end of the input buffer.
155
c1e74734 156=head1 Security
711a3903 157
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158XXX Any security-related notices go here. In particular, any security
159vulnerabilities closed should be noted here rather than in the
160L</Selected Bug Fixes> section.
711a3903 161
c1e74734 162[ List each security issue as a =head2 entry ]
6ba817f3 163
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164=head2 Use C<is_utf8_char_buf()> and not C<is_utf8_char()>
165
166The latter function is now deprecated because its API is insufficient to
167guarantee that it doesn't read (up to 12 bytes in the worst case) beyond
168the end of its input string. See
169L<is_utf8_char_buf()|/Added is_utf8_char_buf()>.
170
c1e74734 171=head1 Incompatible Changes
6ba817f3 172
c1e74734 173XXX For a release on a stable branch, this section aspires to be:
6b339779 174
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175 There are no changes intentionally incompatible with 5.XXX.XXX
176 If any exist, they are bugs, and we request that you submit a
177 report. See L</Reporting Bugs> below.
6b339779 178
c1e74734 179[ List each incompatible change as a =head2 entry ]
b240fc0f 180
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181=head2 Special blocks called in void context
182
183Special blocks (C<BEGIN>, C<CHECK>, C<INIT>, C<UNITCHECK>, C<END>) are now
184called in void context. This avoids wasteful copying of the result of the
185last statement [perl #108794].
186
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187=head2 The C<overloading> pragma and regexp objects
188
189With C<no overloading>, regular expression objects returned by C<qr//> are
190now stringified as "Regexp=REGEXP(0xbe600d)" instead of the regular
191expression itself [perl #108780].
192
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193=head2 Two XS typemap Entries removed
194
195Two presumably unused XS typemap entries have been removed from the
196core typemap: T_DATAUNIT and T_CALLBACK. If you are, against all odds,
197a user of these, please see the instructions on how to regain them
198in L<perlxstypemap>.
199
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200=head2 Unicode 6.1 has incompatibilities with Unicode 6.0
201
202These are detailed in L</Supports (almost) Unicode 6.1> above.
203
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204=head2 Changed returns for some properties in C<Unicode::UCD::prop_invmap()>
205
206The return values for C<prop_invmap> have been changed for some
207properties to make the returned lists significantly smaller. This
208allows those lists to be searched faster.
209
210This function was introduced earlier in the v5.15 series of releases,
211and the API will not be considered stable until v5.16.
212
213See L<Unicode::UCD/prop_invmap()> for details on the new interface.
214
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215=head2 C<$$> and C<getppid()> no longer emulate POSIX semantics under LinuxThreads
216
217The POSIX emulation of C<$$> and C<getppid()> under the obsolete
218LinuxThreads implementation has been removed (the C<$$> emulation was
219actually removed in v5.15.0). This only impacts users of Linux 2.4 and
220users of Debian GNU/kFreeBSD up to and including 6.0, not the vast
221majority of Linux installations that use NPTL threads.
222
223This means that C<getppid()> like C<$$> is now always guaranteed to
224return the OS's idea of the current state of the process, not perl's
225cached version of it.
226
227See the documentation for L<$$|perlvar/$$> for details.
228
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229=head2 Which Non-ASCII characters get quoted by C<quotemeta> and C<\Q> has changed
230
231This is unlikely to result in a real problem, as Perl does not attach
232special meaning to any non-ASCII character, so it is currently
233irrelevant which are quoted or not. This change fixes bug [perl #77654] and
234bring Perl's behavior more into line with Unicode's recommendations.
235See L<perlfunc/quotemeta>.
236
c1e74734 237=head1 Deprecations
b240fc0f 238
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239XXX Any deprecated features, syntax, modules etc. should be listed here.
240In particular, deprecated modules should be listed here even if they are
241listed as an updated module in the L</Modules and Pragmata> section.
4e6ab4ad 242
c1e74734 243[ List each deprecation as a =head2 entry ]
4e6ab4ad 244
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245=head2 C<is_utf8_char()>
246
247This function is deprecated because it could read beyond the end of the
248input string. Use the new L<is_utf8_char_buf()|/Added is_utf8_char_buf()>
249instead.
250
c1e74734 251=head1 Performance Enhancements
79e10968 252
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253XXX Changes which enhance performance without changing behaviour go here. There
254may well be none in a stable release.
79e10968 255
c1e74734 256[ List each enhancement as a =item entry ]
ea88c40c 257
c1e74734 258=over 4
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259
260=item *
261
c1e74734 262XXX
cadced9f 263
c1e74734 264=back
cadced9f 265
c1e74734 266=head1 Modules and Pragmata
cadced9f 267
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268XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
269go here. If Module::CoreList is updated, generate an initial draft of the
270following sections using F<Porting/corelist-perldelta.pl>, which prints stub
271entries to STDOUT. Results can be pasted in place of the '=head2' entries
272below. A paragraph summary for important changes should then be added by hand.
273In an ideal world, dual-life modules would have a F<Changes> file that could be
274cribbed.
cadced9f 275
c1e74734 276[ Within each section, list entries as a =item entry ]
07feb684 277
c1e74734 278=head2 New Modules and Pragmata
cadced9f 279
c1e74734 280=over 4
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281
282=item *
283
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284The C<mmap> PerlIO layer is no longer implemented by perl itself, but has
285been moved out into the new L<PerlIO::mmap> module.
4e6e9b23 286
c1e74734 287=back
4e6e9b23 288
c1e74734 289=head2 Updated Modules and Pragmata
4e6e9b23 290
c1e74734 291=over 4
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292
293=item *
294
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295L<arybase> has been upgraded from version 0.03 to version 0.04.
296
297List slices no longer modify items on the stack belonging to outer lists
298[perl #109570].
299
300=item *
301
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302L<B> has been upgraded from version 1.33 to version 1.34.
303
304C<B::COP> now has a C<stashflags> method, corresponding to a new internal
305field added in 5.15.4 [perl #108860].
306
307=item *
308
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309L<Carp> has been upgraded from version 1.24 to version 1.25.
310
311It now puts a dot after the file and line number, just like errors from
312C<die> [perl #106538].
313
314=item *
315
df697508 316L<Compress::Raw::Bzip2> has been upgraded from version 2.045 to version 2.048.
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317
318=item *
319
ecea5ab2 320L<Compress::Raw::Zlib> has been upgraded from version 2.045 to version 2.048.
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321
322=item *
323
8dcc3739 324L<Compress::Zlib> has been upgraded from version 2.046 to version 2.048.
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325
326=item *
327
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328L<CPAN::Meta> has been upgraded from version 2.113640 to version 2.120351.
329
330Work around a memory leak bug involving version objects in boolean context.
331
332=item *
333
ce09a8a1 334L<CPAN::Meta::YAML> has been upgraded from version 0.005 to version 0.007.
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335
336=item *
337
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338L<CPANPLUS> has been upgraded from version 0.9116 to version 0.9118.
339
340=item *
341
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342L<CPANPLUS::Dist::Build> has been upgraded from version 0.60 to version 0.62.
343
344=item *
345
b34385a6 346L<DB_File> has been upgraded from version 1.824 to version 1.826.
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347
348=item *
349
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350L<diagnostics> has been upgraded from version 1.27 to version 1.28.
351
352When searching for F<perldiag.pod>, it no longer uses paths that were only
353relevant on Perl 5.004 and earlier.
354
355=item *
356
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357L<ExtUtils::ParseXS> has been upgraded from version 3.12 to version 3.15.
358
359The new version comes with important tools for sharing typemaps between
360different CPAN distributions.
361
362=item *
363
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364L<File::Copy> has been upgraded from version 2.21 to version 2.23.
365
366It no longer emits warnings when copying files with newlines in their names
367[perl #109104].
368
369=item *
370
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371L<IPC::Cmd> has been upgraded from version 0.72 to version 0.76.
372
373=item *
374
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375L<Math::Complex> has been upgraded from version 1.58 to version 1.59.
376
377This avoids a new core warning.
378
379=item *
380
4402c0f3 381L<Module::Metadata> has been upgraded from version 1.000007 to version 1.000009.
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382
383Adds C<provides> method to generate a CPAN META provides data structure
384correctly; use of C<package_versions_from_directory> is discouraged.
385
386=item *
387
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388L<Parse::CPAN::Meta> has been upgraded from version 1.4401 to version 1.4402.
389
390=item *
391
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392L<Pod::Functions> has been upgraded from version 1.04 to version 1.05.
393
394F<Functions.pm> is now generated at perl build time from annotations in
395F<perlfunc.pod>. This will ensure that L<Pod::Functions> and L<perlfunc>
396remain in synchronisation.
397
398=item *
399
1051d5b5 400L<Pod::Parser> has been upgraded from version 1.37 to version 1.51.
88c5c971 401
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402=item *
403
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404L<Term::ReadLine> has been upgraded from version 1.07 to version 1.08.
405
406Its C<tkRunning> method now supports L<AnyEvent> event loops, and not just
407L<Tk>. A more general mechanism has been proposed, so this may be reverted
408before Perl 5.16 [perl #108470].
409
410=item *
411
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412L<Socket> has been upgraded from version 1.97 to version 1.98.
413
414=item *
415
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416L<Time::HiRes> has been upgraded from version 1.9724 to version 1.9725.
417
694644e0 418C<Time::HiRes::stat()> no longer corrupts the Perl stack.
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419
420=item *
421
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422L<Unicode::UCD> has been upgraded from version 0.39 to 0.40.
423
424The only change is to fix a formatting error in the Pod.
425
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426=item *
427
428L<Version::Requirements> has been upgraded from version 0.101021 to version 0.101022.
429
c1e74734 430=back
c0504019 431
c1e74734 432=head2 Removed Modules and Pragmata
937a45d0 433
c1e74734 434=over 4
937a45d0 435
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436=item *
437
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438F<t/porting/perlfunc.t> has been added, to test that changes to
439F<pod/perlfunc.pod> do not inadvertently break the build of L<Pod::Functions>.
ef337e16 440
7f28d7ed 441=back
679b54e7 442
52deee2e 443=head1 Documentation
3c7c5233 444
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445XXX Changes to files in F<pod/> go here. Consider grouping entries by
446file and be sure to link to the appropriate page, e.g. L<perlfunc>.
a71d67b1 447
c1e74734 448=head2 New Documentation
cadced9f 449
c1e74734 450XXX Changes which create B<new> files in F<pod/> go here.
cadced9f 451
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452=head3 L<perlxstypemap>
453
454The new manual describes the XS typemapping mechanism in unprecedented
455detail and combines new documentation with information extracted from
456L<perlxs> and the previously unofficial list of all core typemaps.
457
c1e74734 458=head3 L<XXX>
cadced9f 459
c1e74734 460XXX Description of the purpose of the new file here
cadced9f 461
c1e74734 462=head2 Changes to Existing Documentation
cadced9f 463
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464XXX Changes which significantly change existing files in F<pod/> go here.
465However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
466section.
cadced9f 467
c1e74734 468=head3 L<XXX>
7e7629fa 469
52deee2e 470=over 4
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471
472=item *
473
c1e74734 474XXX Description of the change here
c2654555 475
52deee2e 476=back
85ca3be7 477
52deee2e 478=head1 Diagnostics
85ca3be7 479
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480The following additions or changes have been made to diagnostic output,
481including warnings and fatal error messages. For the complete list of
482diagnostic messages, see L<perldiag>.
7788a270 483
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484XXX New or changed warnings emitted by the core's C<C> code go here. Also
485include any changes in L<perldiag> that reconcile it to the C<C> code.
6138a722 486
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487[ Within each section, list entries as a =item entry that links to perldiag,
488 e.g.
a47fb3fe 489
c1e74734 490 =item *
4888c563 491
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492 L<Invalid version object|perldiag/"Invalid version object">
493]
a3f52e2e 494
c1e74734 495=head2 New Diagnostics
52272450 496
c1e74734 497XXX Newly added diagnostic messages go here
52272450 498
c1e74734 499=head3 New Errors
a47fb3fe 500
0aaeb177 501=over 4
7ef25837 502
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503=item *
504
c1e74734 505XXX L<message|perldiag/"message">
604a99bd 506
c1e74734 507=back
ea88c40c 508
c1e74734 509=head3 New Warnings
ea88c40c 510
c1e74734 511=over 4
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512
513=item *
514
c1e74734 515XXX L<message|perldiag/"message">
ea88c40c 516
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517=back
518
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519=head2 Changes to Existing Diagnostics
520
521XXX Changes (i.e. rewording) of diagnostic messages go here
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522
523=over 4
524
525=item *
526
c1e74734 527XXX Describe change here
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528
529=back
530
0aaeb177 531=head1 Utility Changes
9cfd094e 532
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533XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
534here. Most of these are built within the directories F<utils> and F<x2p>.
d7fbd56d 535
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536[ List utility changes as a =head3 entry for each utility and =item
537entries for each change
538Use L<XXX> with program names to get proper documentation linking. ]
d7fbd56d 539
c1e74734 540=head3 L<XXX>
d7fbd56d 541
c1e74734 542=over 4
ba91b4f3 543
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544=item *
545
c1e74734 546XXX
b18aa002 547
52deee2e 548=back
ba91b4f3 549
52deee2e 550=head1 Configuration and Compilation
f4912a50 551
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552XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
553go here. Any other changes to the Perl build process should be listed here.
554However, any platform-specific changes should be listed in the
555L</Platform Support> section, instead.
a3f52e2e 556
c1e74734 557[ List changes as a =item entry ].
a3f52e2e 558
0aaeb177 559=over 4
ad32999b 560
f4912a50 561=item *
ad32999b 562
c1e74734 563XXX
c15f899f 564
7f28d7ed 565=back
ad32999b 566
c1e74734 567=head1 Testing
39de7394 568
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569XXX Any significant changes to the testing of a freshly built perl should be
570listed here. Changes which create B<new> files in F<t/> go here as do any
571large changes to the testing harness (e.g. when parallel testing was added).
572Changes to existing files in F<t/> aren't worth summarising, although the bugs
573that they represent may be covered elsewhere.
39de7394 574
c1e74734 575[ List each test improvement as a =item entry ]
39de7394 576
c1e74734 577=over 4
5dd80d85 578
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579=item *
580
c1e74734 581XXX
52272450 582
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583=item *
584
585The test suite for typemaps has been extended to cover a larger fraction of
586the core typemaps.
587
52deee2e 588=back
5dd80d85 589
c1e74734 590=head1 Platform Support
52272450 591
c1e74734 592XXX Any changes to platform support should be listed in the sections below.
52272450 593
c1e74734
CBW
594[ Within the sections, list each platform as a =item entry with specific
595changes as paragraphs below it. ]
ad266194 596
c1e74734 597=head2 New Platforms
ad266194 598
c1e74734
CBW
599XXX List any platforms that this version of perl compiles on, that previous
600versions did not. These will either be enabled by new files in the F<hints/>
601directories, or new subdirectories and F<README> files at the top level of the
602source tree.
ad266194 603
c1e74734 604=over 4
838cf719 605
c1e74734 606=item XXX-some-platform
838cf719 607
c1e74734 608XXX
b00f6edb 609
c1e74734 610=back
b00f6edb 611
c1e74734 612=head2 Discontinued Platforms
7a3fd9ed 613
c1e74734 614XXX List any platforms that this version of perl no longer compiles on.
7a3fd9ed 615
c1e74734 616=over 4
1a50d74b 617
c1e74734 618=item XXX-some-platform
1a50d74b 619
c1e74734 620XXX
ea88c40c 621
c1e74734 622=back
ea88c40c 623
c1e74734 624=head2 Platform-Specific Notes
ea88c40c 625
c1e74734
CBW
626XXX List any changes for specific platforms. This could include configuration
627and compilation changes or changes in portability/compatibility. However,
628changes within modules for platforms should generally be listed in the
629L</Modules and Pragmata> section.
ea88c40c 630
c1e74734 631=over 4
ea88c40c 632
c1e74734 633=item XXX-some-platform
ea88c40c 634
c1e74734 635XXX
ea88c40c 636
c1e74734 637=back
ea88c40c 638
c1e74734 639=head1 Internal Changes
ea88c40c 640
c1e74734
CBW
641XXX Changes which affect the interface available to C<XS> code go here.
642Other significant internal changes for future core maintainers should
643be noted as well.
ea88c40c 644
c1e74734 645[ List each change as a =item entry ]
ea88c40c 646
c1e74734 647=over 4
ea88c40c
FC
648
649=item *
650
c1e74734 651XXX
ea88c40c 652
c1e74734 653=back
ea88c40c 654
c1e74734 655=head1 Selected Bug Fixes
ea88c40c 656
c1e74734
CBW
657XXX Important bug fixes in the core language are summarised here.
658Bug fixes in files in F<ext/> and F<lib/> are best summarised in
659L</Modules and Pragmata>.
ea88c40c 660
c1e74734 661[ List each fix as a =item entry ]
ea88c40c 662
c1e74734 663=over 4
ea88c40c
FC
664
665=item *
666
6025c6dd
RS
667C<~~> now correctly handles the precedence of Any~~Object, and is not tricked
668by an overloaded object on the left-hand side.
ea88c40c 669
249950d7
FC
670=item *
671
672C<stat _> no longer warns about unopened filehandles [perl #71002].
673
674=item *
675
676C<stat> on an unopened filehandle now warns consistently, instead of
677skipping the warning at times.
678
679=item *
680
681A change in an earlier 5.15 release caused warning hints to propagate into
682C<do $file>. This has been fixed [rt.cpan.org #72767].
683
684=item *
685
686Starting with 5.12.0, Perl used to get its internal bookkeeping muddled up
687after assigning C<${ qr// }> to a hash element and locking it with
688L<Hash::Util>. This could result in double frees, crashes or erratic
689behaviour.
690
92c88ef1
FC
691=item *
692
693In 5.15.7, some typeglobs in the CORE namespace were made read-only by
694mistake. This has been fixed [rt.cpan.org #74289].
695
b1ea7742
FC
696=item *
697
698C<-t> now works when stacked with other filetest operators [perl #77388].
699
a1d95121
FC
700=item *
701
702Stacked filetest operators now only call FETCH once on a tied argument.
703
ff4ff6f3
FC
704=item *
705
706C</.*/g> would sometimes refuse to match at the end of a string that ends
707with "\n". This has been fixed [perl #109206].
708
a7bff800
FC
709=item *
710
ea317ccb
KW
711C<m/[[:ascii:]]/i> and C</\p{ASCII}/i> now match identically (when not
712under a differing locale). This fixes a regression introduced in 5.14
713in which the first expression could match characters outside of ASCII,
714such as the KELVIN SIGN.
715
716=item *
717
a7bff800
FC
718Method calls whose arguments were all surrounded with C<my()> or C<our()>
719(as in C<<$object->method(my($a,$b)) >>) used to force lvalue context on
720the subroutine. This would prevent lvalue methods from returning certain
721values. Due to lvalue fixes earlier in the 5.15.x series, it would also
722prevent non-lvalue methods from being called [perl #109264].
723
724=for comment
725This bug I<did> affect earlier stable releases. It is just the last
726sentence that does not apply to 5.14.
727
0aae26c1
FC
728=item *
729
730The C<SvPVutf8> C function no longer tries to modify its argument,
731resulting in errors [perl #108994].
732
733=item *
734
735C<SvPVutf8> now works properly with magical variables.
736
737=item *
738
739C<SvPVbyte> now works properly non-PVs.
740
07315176
KW
741=item *
742
67addccf
KW
743C</[[:ascii:]]/> and C</[[:blank:]]/> now use locale rules under
744C<use locale> when the platform supports that. Previously, they used
07315176
KW
745the platform's native character set.
746
5d103fec
KW
747=item *
748
749A regression introduced in 5.13.6 was fixed. This involved an inverted
750bracketed character class in a regular expression that consisted solely
751of a Unicode property, that property wasn't getting inverted outside the
752Latin1 range.
753
2e2b2571
KW
754=item *
755
756C<quotemeta> now quotes consistently the same non-ASCII characters under
757C<use feature 'unicode_strings'>, regardless of whether the string is
758encoded in UTF-8 or not, hence fixing the last vestiges (we hope) of the
759infamous L<perlunicode/The "Unicode Bug">. [perl #77654].
760
761Which of these code points is quoted has changed, based on Unicode's
762recommendations. See L<perlfunc/quotemeta> for details.
763
ea88c40c
FC
764=back
765
c1e74734 766=head1 Known Problems
ea88c40c 767
c1e74734
CBW
768XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
769tests that had to be C<TODO>ed for the release would be noted here, unless
770they were specific to a particular platform (see below).
ea88c40c 771
c1e74734
CBW
772This is a list of some significant unfixed bugs, which are regressions
773from either 5.XXX.XXX or 5.XXX.XXX.
ea88c40c 774
c1e74734 775[ List each fix as a =item entry ]
ea88c40c 776
c1e74734 777=over 4
18af289e 778
c1e74734 779=item *
18af289e 780
c1e74734 781XXX
1ac442bc 782
c1e74734 783=back
c0154fe2 784
c1e74734 785=head1 Obituary
1ac442bc 786
c1e74734
CBW
787XXX If any significant core contributor has died, we've added a short obituary
788here.
84b2a83e 789
52deee2e 790=head1 Acknowledgements
8fe05716 791
c1e74734
CBW
792XXX Generate this with:
793
794 perl Porting/acknowledgements.pl v5.15.7..HEAD
29cf780c 795
44691e6f
AB
796=head1 Reporting Bugs
797
798If you find what you think is a bug, you might check the articles
52deee2e
DR
799recently posted to the comp.lang.perl.misc newsgroup and the perl
800bug database at http://rt.perl.org/perlbug/ . There may also be
44691e6f
AB
801information at http://www.perl.org/ , the Perl Home Page.
802
803If you believe you have an unreported bug, please run the L<perlbug>
52deee2e
DR
804program included with your release. Be sure to trim your bug down
805to a tiny but sufficient test case. Your bug report, along with the
806output of C<perl -V>, will be sent off to perlbug@perl.org to be
807analysed by the Perl porting team.
44691e6f
AB
808
809If the bug you are reporting has security implications, which make it
52deee2e
DR
810inappropriate to send to a publicly archived mailing list, then please send
811it to perl5-security-report@perl.org. This points to a closed subscription
812unarchived mailing list, which includes
813all the core committers, who will be able
814to help assess the impact of issues, figure out a resolution, and help
815co-ordinate the release of patches to mitigate or fix the problem across all
816platforms on which Perl is supported. Please only use this address for
817security issues in the Perl core, not for modules independently
818distributed on CPAN.
44691e6f
AB
819
820=head1 SEE ALSO
821
52deee2e
DR
822The F<Changes> file for an explanation of how to view exhaustive details
823on what changed.
44691e6f
AB
824
825The F<INSTALL> file for how to build Perl.
826
827The F<README> file for general stuff.
828
829The F<Artistic> and F<Copying> files for copyright information.
830
831=cut