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1=encoding utf8
2
249950d7 3=for comment
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
db98b5a2 316L<Compress::Raw::Bzip2> has been upgraded from version 2.045 to version 2.049.
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317
318=item *
319
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320L<Compress::Raw::Zlib> has been upgraded from version 2.045 to version 2.049.
321
322Include zlib 1.2.6 source
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323
324=item *
325
785e05e1 326L<Compress::Zlib> has been upgraded from version 2.046 to version 2.049.
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327
328=item *
329
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330L<CPAN::Meta> has been upgraded from version 2.113640 to version 2.120351.
331
332Work around a memory leak bug involving version objects in boolean context.
333
334=item *
335
ce09a8a1 336L<CPAN::Meta::YAML> has been upgraded from version 0.005 to version 0.007.
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337
338=item *
339
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340L<CPANPLUS> has been upgraded from version 0.9116 to version 0.9118.
341
342=item *
343
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344L<CPANPLUS::Dist::Build> has been upgraded from version 0.60 to version 0.62.
345
346=item *
347
b34385a6 348L<DB_File> has been upgraded from version 1.824 to version 1.826.
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349
350=item *
351
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352L<diagnostics> has been upgraded from version 1.27 to version 1.28.
353
354When searching for F<perldiag.pod>, it no longer uses paths that were only
355relevant on Perl 5.004 and earlier.
356
357=item *
358
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359L<ExtUtils::ParseXS> has been upgraded from version 3.12 to version 3.15.
360
361The new version comes with important tools for sharing typemaps between
362different CPAN distributions.
363
364=item *
365
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366L<File::Copy> has been upgraded from version 2.21 to version 2.23.
367
368It no longer emits warnings when copying files with newlines in their names
369[perl #109104].
370
371=item *
372
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373L<IPC::Cmd> has been upgraded from version 0.72 to version 0.76.
374
375=item *
376
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377L<Math::Complex> has been upgraded from version 1.58 to version 1.59.
378
379This avoids a new core warning.
380
381=item *
382
4402c0f3 383L<Module::Metadata> has been upgraded from version 1.000007 to version 1.000009.
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384
385Adds C<provides> method to generate a CPAN META provides data structure
386correctly; use of C<package_versions_from_directory> is discouraged.
387
388=item *
389
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390L<Parse::CPAN::Meta> has been upgraded from version 1.4401 to version 1.4402.
391
392=item *
393
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394L<perlfaq> has been upgraded from version 5.0150038 to version 5.0150039.
395
396=item *
397
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398L<Pod::Functions> has been upgraded from version 1.04 to version 1.05.
399
400F<Functions.pm> is now generated at perl build time from annotations in
401F<perlfunc.pod>. This will ensure that L<Pod::Functions> and L<perlfunc>
402remain in synchronisation.
403
404=item *
405
1051d5b5 406L<Pod::Parser> has been upgraded from version 1.37 to version 1.51.
88c5c971 407
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408=item *
409
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410L<Term::ReadLine> has been upgraded from version 1.07 to version 1.08.
411
412Its C<tkRunning> method now supports L<AnyEvent> event loops, and not just
413L<Tk>. A more general mechanism has been proposed, so this may be reverted
414before Perl 5.16 [perl #108470].
415
416=item *
417
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418L<Socket> has been upgraded from version 1.97 to version 1.98.
419
420=item *
421
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422L<Time::HiRes> has been upgraded from version 1.9724 to version 1.9725.
423
694644e0 424C<Time::HiRes::stat()> no longer corrupts the Perl stack.
858dcda5
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425
426=item *
427
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428L<Unicode::UCD> has been upgraded from version 0.39 to 0.40.
429
430The only change is to fix a formatting error in the Pod.
431
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432=item *
433
434L<Version::Requirements> has been upgraded from version 0.101021 to version 0.101022.
435
c1e74734 436=back
c0504019 437
c1e74734 438=head2 Removed Modules and Pragmata
937a45d0 439
c1e74734 440=over 4
937a45d0 441
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442=item *
443
cf6f994f 444XXX
ef337e16 445
7f28d7ed 446=back
679b54e7 447
52deee2e 448=head1 Documentation
3c7c5233 449
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450XXX Changes to files in F<pod/> go here. Consider grouping entries by
451file and be sure to link to the appropriate page, e.g. L<perlfunc>.
a71d67b1 452
c1e74734 453=head2 New Documentation
cadced9f 454
c1e74734 455XXX Changes which create B<new> files in F<pod/> go here.
cadced9f 456
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457=head3 L<perlxstypemap>
458
459The new manual describes the XS typemapping mechanism in unprecedented
460detail and combines new documentation with information extracted from
461L<perlxs> and the previously unofficial list of all core typemaps.
462
c1e74734 463=head3 L<XXX>
cadced9f 464
c1e74734 465XXX Description of the purpose of the new file here
cadced9f 466
c1e74734 467=head2 Changes to Existing Documentation
cadced9f 468
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469XXX Changes which significantly change existing files in F<pod/> go here.
470However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
471section.
cadced9f 472
c1e74734 473=head3 L<XXX>
7e7629fa 474
52deee2e 475=over 4
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476
477=item *
478
c1e74734 479XXX Description of the change here
c2654555 480
52deee2e 481=back
85ca3be7 482
52deee2e 483=head1 Diagnostics
85ca3be7 484
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485The following additions or changes have been made to diagnostic output,
486including warnings and fatal error messages. For the complete list of
487diagnostic messages, see L<perldiag>.
7788a270 488
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489XXX New or changed warnings emitted by the core's C<C> code go here. Also
490include any changes in L<perldiag> that reconcile it to the C<C> code.
6138a722 491
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492[ Within each section, list entries as a =item entry that links to perldiag,
493 e.g.
a47fb3fe 494
c1e74734 495 =item *
4888c563 496
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497 L<Invalid version object|perldiag/"Invalid version object">
498]
a3f52e2e 499
c1e74734 500=head2 New Diagnostics
52272450 501
c1e74734 502XXX Newly added diagnostic messages go here
52272450 503
c1e74734 504=head3 New Errors
a47fb3fe 505
0aaeb177 506=over 4
7ef25837 507
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508=item *
509
c1e74734 510XXX L<message|perldiag/"message">
604a99bd 511
c1e74734 512=back
ea88c40c 513
c1e74734 514=head3 New Warnings
ea88c40c 515
c1e74734 516=over 4
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517
518=item *
519
c1e74734 520XXX L<message|perldiag/"message">
ea88c40c 521
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522=back
523
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524=head2 Changes to Existing Diagnostics
525
526XXX Changes (i.e. rewording) of diagnostic messages go here
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527
528=over 4
529
530=item *
531
c1e74734 532XXX Describe change here
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533
534=back
535
0aaeb177 536=head1 Utility Changes
9cfd094e 537
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538XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
539here. Most of these are built within the directories F<utils> and F<x2p>.
d7fbd56d 540
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541[ List utility changes as a =head3 entry for each utility and =item
542entries for each change
543Use L<XXX> with program names to get proper documentation linking. ]
d7fbd56d 544
c1e74734 545=head3 L<XXX>
d7fbd56d 546
c1e74734 547=over 4
ba91b4f3 548
b18aa002
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549=item *
550
c1e74734 551XXX
b18aa002 552
52deee2e 553=back
ba91b4f3 554
52deee2e 555=head1 Configuration and Compilation
f4912a50 556
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557XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
558go here. Any other changes to the Perl build process should be listed here.
559However, any platform-specific changes should be listed in the
560L</Platform Support> section, instead.
a3f52e2e 561
c1e74734 562[ List changes as a =item entry ].
a3f52e2e 563
0aaeb177 564=over 4
ad32999b 565
f4912a50 566=item *
ad32999b 567
c1e74734 568XXX
c15f899f 569
7f28d7ed 570=back
ad32999b 571
c1e74734 572=head1 Testing
39de7394 573
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574XXX Any significant changes to the testing of a freshly built perl should be
575listed here. Changes which create B<new> files in F<t/> go here as do any
576large changes to the testing harness (e.g. when parallel testing was added).
577Changes to existing files in F<t/> aren't worth summarising, although the bugs
578that they represent may be covered elsewhere.
39de7394 579
c1e74734 580[ List each test improvement as a =item entry ]
39de7394 581
c1e74734 582=over 4
5dd80d85 583
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584=item *
585
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586F<t/porting/pending-author.t> has been added, to avoid the problem of
587C<make test> passing 100%, but the subsequent git commit causing
588F<t/porting/authors.t> to fail, because it uses a "new" e-mail address.
589
590This test is only run if one is building inside a git checkout, B<and> one
591has made local changes. Otherwise it's skipped.
592
593=item *
594
cf6f994f
NC
595F<t/porting/perlfunc.t> has been added, to test that changes to
596F<pod/perlfunc.pod> do not inadvertently break the build of L<Pod::Functions>.
52272450 597
84ecb73f
S
598=item *
599
600The test suite for typemaps has been extended to cover a larger fraction of
601the core typemaps.
602
52deee2e 603=back
5dd80d85 604
c1e74734 605=head1 Platform Support
52272450 606
c1e74734 607XXX Any changes to platform support should be listed in the sections below.
52272450 608
c1e74734
CBW
609[ Within the sections, list each platform as a =item entry with specific
610changes as paragraphs below it. ]
ad266194 611
c1e74734 612=head2 New Platforms
ad266194 613
c1e74734
CBW
614XXX List any platforms that this version of perl compiles on, that previous
615versions did not. These will either be enabled by new files in the F<hints/>
616directories, or new subdirectories and F<README> files at the top level of the
617source tree.
ad266194 618
c1e74734 619=over 4
838cf719 620
c1e74734 621=item XXX-some-platform
838cf719 622
c1e74734 623XXX
b00f6edb 624
c1e74734 625=back
b00f6edb 626
c1e74734 627=head2 Discontinued Platforms
7a3fd9ed 628
c1e74734 629XXX List any platforms that this version of perl no longer compiles on.
7a3fd9ed 630
c1e74734 631=over 4
1a50d74b 632
c1e74734 633=item XXX-some-platform
1a50d74b 634
c1e74734 635XXX
ea88c40c 636
c1e74734 637=back
ea88c40c 638
c1e74734 639=head2 Platform-Specific Notes
ea88c40c 640
c1e74734
CBW
641XXX List any changes for specific platforms. This could include configuration
642and compilation changes or changes in portability/compatibility. However,
643changes within modules for platforms should generally be listed in the
644L</Modules and Pragmata> section.
ea88c40c 645
c1e74734 646=over 4
ea88c40c 647
c1e74734 648=item XXX-some-platform
ea88c40c 649
c1e74734 650XXX
ea88c40c 651
c1e74734 652=back
ea88c40c 653
c1e74734 654=head1 Internal Changes
ea88c40c 655
c1e74734
CBW
656XXX Changes which affect the interface available to C<XS> code go here.
657Other significant internal changes for future core maintainers should
658be noted as well.
ea88c40c 659
c1e74734 660[ List each change as a =item entry ]
ea88c40c 661
c1e74734 662=over 4
ea88c40c
FC
663
664=item *
665
c1e74734 666XXX
ea88c40c 667
c1e74734 668=back
ea88c40c 669
c1e74734 670=head1 Selected Bug Fixes
ea88c40c 671
c1e74734
CBW
672XXX Important bug fixes in the core language are summarised here.
673Bug fixes in files in F<ext/> and F<lib/> are best summarised in
674L</Modules and Pragmata>.
ea88c40c 675
c1e74734 676[ List each fix as a =item entry ]
ea88c40c 677
c1e74734 678=over 4
ea88c40c
FC
679
680=item *
681
6025c6dd
RS
682C<~~> now correctly handles the precedence of Any~~Object, and is not tricked
683by an overloaded object on the left-hand side.
ea88c40c 684
249950d7
FC
685=item *
686
687C<stat _> no longer warns about unopened filehandles [perl #71002].
688
689=item *
690
691C<stat> on an unopened filehandle now warns consistently, instead of
692skipping the warning at times.
693
694=item *
695
696A change in an earlier 5.15 release caused warning hints to propagate into
697C<do $file>. This has been fixed [rt.cpan.org #72767].
698
699=item *
700
701Starting with 5.12.0, Perl used to get its internal bookkeeping muddled up
702after assigning C<${ qr// }> to a hash element and locking it with
703L<Hash::Util>. This could result in double frees, crashes or erratic
704behaviour.
705
92c88ef1
FC
706=item *
707
708In 5.15.7, some typeglobs in the CORE namespace were made read-only by
709mistake. This has been fixed [rt.cpan.org #74289].
710
b1ea7742
FC
711=item *
712
713C<-t> now works when stacked with other filetest operators [perl #77388].
714
a1d95121
FC
715=item *
716
717Stacked filetest operators now only call FETCH once on a tied argument.
718
ff4ff6f3
FC
719=item *
720
721C</.*/g> would sometimes refuse to match at the end of a string that ends
722with "\n". This has been fixed [perl #109206].
723
a7bff800
FC
724=item *
725
ea317ccb
KW
726C<m/[[:ascii:]]/i> and C</\p{ASCII}/i> now match identically (when not
727under a differing locale). This fixes a regression introduced in 5.14
728in which the first expression could match characters outside of ASCII,
729such as the KELVIN SIGN.
730
731=item *
732
a7bff800
FC
733Method calls whose arguments were all surrounded with C<my()> or C<our()>
734(as in C<<$object->method(my($a,$b)) >>) used to force lvalue context on
735the subroutine. This would prevent lvalue methods from returning certain
736values. Due to lvalue fixes earlier in the 5.15.x series, it would also
737prevent non-lvalue methods from being called [perl #109264].
738
739=for comment
740This bug I<did> affect earlier stable releases. It is just the last
741sentence that does not apply to 5.14.
742
0aae26c1
FC
743=item *
744
745The C<SvPVutf8> C function no longer tries to modify its argument,
746resulting in errors [perl #108994].
747
748=item *
749
750C<SvPVutf8> now works properly with magical variables.
751
752=item *
753
754C<SvPVbyte> now works properly non-PVs.
755
07315176
KW
756=item *
757
67addccf
KW
758C</[[:ascii:]]/> and C</[[:blank:]]/> now use locale rules under
759C<use locale> when the platform supports that. Previously, they used
07315176
KW
760the platform's native character set.
761
5d103fec
KW
762=item *
763
764A regression introduced in 5.13.6 was fixed. This involved an inverted
765bracketed character class in a regular expression that consisted solely
766of a Unicode property, that property wasn't getting inverted outside the
767Latin1 range.
768
2e2b2571
KW
769=item *
770
771C<quotemeta> now quotes consistently the same non-ASCII characters under
772C<use feature 'unicode_strings'>, regardless of whether the string is
773encoded in UTF-8 or not, hence fixing the last vestiges (we hope) of the
774infamous L<perlunicode/The "Unicode Bug">. [perl #77654].
775
776Which of these code points is quoted has changed, based on Unicode's
777recommendations. See L<perlfunc/quotemeta> for details.
778
ea88c40c
FC
779=back
780
c1e74734 781=head1 Known Problems
ea88c40c 782
c1e74734
CBW
783XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
784tests that had to be C<TODO>ed for the release would be noted here, unless
785they were specific to a particular platform (see below).
ea88c40c 786
c1e74734
CBW
787This is a list of some significant unfixed bugs, which are regressions
788from either 5.XXX.XXX or 5.XXX.XXX.
ea88c40c 789
c1e74734 790[ List each fix as a =item entry ]
ea88c40c 791
c1e74734 792=over 4
18af289e 793
c1e74734 794=item *
18af289e 795
c1e74734 796XXX
1ac442bc 797
c1e74734 798=back
c0154fe2 799
c1e74734 800=head1 Obituary
1ac442bc 801
c1e74734
CBW
802XXX If any significant core contributor has died, we've added a short obituary
803here.
84b2a83e 804
52deee2e 805=head1 Acknowledgements
8fe05716 806
c1e74734
CBW
807XXX Generate this with:
808
809 perl Porting/acknowledgements.pl v5.15.7..HEAD
29cf780c 810
44691e6f
AB
811=head1 Reporting Bugs
812
813If you find what you think is a bug, you might check the articles
52deee2e
DR
814recently posted to the comp.lang.perl.misc newsgroup and the perl
815bug database at http://rt.perl.org/perlbug/ . There may also be
44691e6f
AB
816information at http://www.perl.org/ , the Perl Home Page.
817
818If you believe you have an unreported bug, please run the L<perlbug>
52deee2e
DR
819program included with your release. Be sure to trim your bug down
820to a tiny but sufficient test case. Your bug report, along with the
821output of C<perl -V>, will be sent off to perlbug@perl.org to be
822analysed by the Perl porting team.
44691e6f
AB
823
824If the bug you are reporting has security implications, which make it
52deee2e
DR
825inappropriate to send to a publicly archived mailing list, then please send
826it to perl5-security-report@perl.org. This points to a closed subscription
827unarchived mailing list, which includes
828all the core committers, who will be able
829to help assess the impact of issues, figure out a resolution, and help
830co-ordinate the release of patches to mitigate or fix the problem across all
831platforms on which Perl is supported. Please only use this address for
832security issues in the Perl core, not for modules independently
833distributed on CPAN.
44691e6f
AB
834
835=head1 SEE ALSO
836
52deee2e
DR
837The F<Changes> file for an explanation of how to view exhaustive details
838on what changed.
44691e6f
AB
839
840The F<INSTALL> file for how to build Perl.
841
842The F<README> file for general stuff.
843
844The F<Artistic> and F<Copying> files for copyright information.
845
846=cut