5 perldelta - what is new for perl v5.15.9
9 This document describes differences between the 5.15.8 release and
12 If you are upgrading from an earlier release such as 5.15.7, first read
13 L<perl5158delta>, which describes differences between 5.15.7 and
18 This space intentionally left blank.
20 =head1 Core Enhancements
22 =head2 C<< no feature; >> now means reset to default
24 C<< no feature >> now resets to the default feature set. To disable all
25 features (which is likely to be a pretty special-purpose request, since
26 it presumably won't match any named set of semantics) you can now
27 write C<< no feature ':all' >>.
31 =head2 Malformed UTF-8 input could cause attempts to read beyond the end of the buffer
33 Two new XS-accessible functions, C<utf8_to_uvchr_buf()> and
34 C<utf8_to_uvuni_buf()> are now available to prevent this, and the Perl
35 core has been converted to use them.
36 See L</Internal Changes>.
38 =head1 Incompatible Changes
40 =head2 C<< no feature; >>
42 C<no feature;> now means reset to default.
46 =head2 Literal C<< "{" >> characters in regular expressions.
48 It has been documented that the current plans include requiring a
49 literal C<< "{" >> to be escaped: 5.18 will emit deprecation warnings,
50 and it will be required in 5.20.
52 =head2 XS functions C<utf8_to_uvchr()> and C<utf8_to_uvuni()>
54 Use C<utf8_to_uvchr_buf()> and C<utf8_to_uvuni_buf()> instead.
55 See L</Internal Changes>.
57 =head1 Performance Enhancements
63 Fix a slowdown in freeing nested hashes. This may speedup the exit of
68 =head1 Modules and Pragmata
70 =head2 Updated Modules and Pragmata
76 C<attributes> has been upgraded from version 0.17 to 0.18.
80 C<charnames> has been upgraded from version 1.29 to 1.30.
84 C<feature> has been upgraded from version 1.26 to 1.27.
86 C<no feature;> now means reset to default. The code has been refactored
87 to reduce duplication.
91 C<B::Deparse> has been upgraded from version 1.12 to 1.13.
95 C<B::Lint> has been upgraded from version 1.13 to 1.14.
99 C<CPAN::Meta> has been upgraded from version 2.120351 to 2.120630.
103 C<CPANPLUS> has been upgraded from version 0.9118 to 0.9121.
107 C<Data::Dumper> has been upgraded from version 2.135_05 to 2.135_06.
111 C<Digest::SHA> has been upgraded from version 5.70 to 5.71.
115 C<ExtUtils::CBuilder> has been upgraded from version 0.280205 to 0.280206.
119 C<HTTP::Tiny> has been upgraded from version 0.016 to 0.017.
123 C<Module::CoreList> has been upgraded from version 2.60 to 2.63.
127 C<Pod::Html> has been upgraded from version 1.14 to 1.1501.
131 C<Pod::Perldoc> has been upgraded from version 3.15_15 to 3.17.
135 C<Pod::Simple> has been upgraded from version 3.19 to 3.20.
139 C<Socket> has been upgraded from version 1.98 to 2.000.
143 C<Term::ReadLine> has been upgraded from version 1.08 to 1.09.
147 C<Unicode::Collate> has been upgraded from version 0.87 to 0.89.
151 C<Unicode::Normalize> has been upgraded from version 1.13 to 1.14.
155 C<Unicode::UCD> has been upgraded from version 0.41 to 0.42.
159 C<XS::APItest> has been upgraded from version 0.36 to 0.37.
166 There has been no significant change in the documentation between
171 The following additions or changes have been made to diagnostic output,
172 including warnings and fatal error messages. For the complete list of
173 diagnostic messages, see L<perldiag>.
175 =head2 New Diagnostics
179 Compared to 5.15.8, 5.15.9 does not introduce new errors.
183 Compared to 5.15.8, 5.15.9 does not introduce new errors, but see
184 L</Changes to Existing Diagnostics>
186 =head2 Changes to Existing Diagnostics
192 L<lvalue attribute %s already-defined subroutine|perldiag/"lvalue attribute %s already-defined subroutine">, which replaces
193 C<< lvalue attribute cannot be removed after the subroutine has been defined >>.
197 =head1 Utility Changes
199 No utilities changed between 5.15.8 and 5.15.9.
201 =head1 Configuration and Compilation
207 C<< perlfunc.html >> is now being generated again. [perl #107870]
217 F<< t/op/require_37033.t >> has been added, to test that C<require>
218 always closes the file handle that it opens. Previously, it had been
219 leaking the file handle if it happened to have file descriptor 0, which
220 would happen if C<require> was called (explicitly or implicitly) when
221 C<STDIN> had been closed.
225 =head1 Platform Support
227 There have been no changes to Perl's support of various platforms between
230 =head1 Internal Changes
236 Two new functions C<utf8_to_uvchr_buf()> and C<utf8_to_uvuni_buf()> have
237 been added. These are the same as C<utf8_to_uvchr> and
238 C<utf8_to_uvuni> (which are now deprecated), but take an extra parameter
239 that is used to guard against reading beyond the end of the input
241 See L<perlapi/utf8_to_uvchr_buf> and L<perlapi/utf8_to_uvuni_buf>.
245 The regular expression engine now does TRIE case insensitive matches
246 under Unicode. This may change the output of C<< use re 'debug'; >>,
247 and will speed up various things.
251 =head1 Selected Bug Fixes
257 I<Takri> now matches two more characters under the C<Script_Extensions>
258 property. This corrects a Unicode 6.1 omission.
262 C<< perlfunc.html >> is now being generated again. [perl #107870]
266 C<< $$ >> is no longer tainted. Since this value comes directly from
267 C<< getpid() >>, it is always safe.
271 Fix leaking a file handle. [perl #37033]
275 An off-by-one error caused C<< /[:upper:]/ >> and C<< /[:punct:]/ >> to
276 unexpectedly match characters with code points above 255. This has been
277 rectified. [perl 111400].
281 C<< (?foo: ...) >> no longer loses passed in character set.
285 Allow attributes to set C<< :lvalue >> on a defined sub. [perl 107366].
289 C<< die; >> with a non-reference, non-string value in $@ now properly
290 propagates that value [perl #111654].
294 C<< Term::ReadLine >> now uses AnyEvent instead of Tk for an event loop.
298 =head1 Known Problems
300 This is a list of some significant unfixed bugs, which are regressions
301 from either 5.14.0 or 5.15.8.
305 =item C<eval { 'fork()' }> is broken on Windows [perl #109718]
307 This is a known test failure to be fixed before 5.16.0.
309 =item C<< Pod-Html >> test failures on Windows.
311 A number of tests for C<< Pod::Html >> fail under Windows, due to an
312 incorrect assumption by the test scripts about capitalization of the
317 =head1 Acknowledgements
319 XXX Redo this on 2012-03-20
321 Perl 5.15.9 represents approximately 4 weeks of development since Perl 5.15.8
322 and contains approximately 74,000 lines of changes across 470 files from 23
325 Perl continues to flourish into its third decade thanks to a vibrant community
326 of users and developers. The following people are known to have contributed the
327 improvements that became Perl 5.15.9:
329 Aaron Crane, Abigail, Chris 'BinGOs' Williams, Craig A. Berry, Dave Rolsky,
330 David Cantrell, David Golden, David Mitchell, Eric Brine, Father Chrysostomos,
331 Florian Ragwitz, James E Keenan, Jesse Vincent, Karl Williamson, Marc Green,
332 Max Maischein, Nicholas Clark, Pau Amma, Reini Urban, Ricardo Signes, Tony
333 Cook, Yves Orton, Zefram.
335 The list above is almost certainly incomplete as it is automatically generated
336 from version control history. In particular, it does not include the names of
337 the (very much appreciated) contributors who reported issues to the Perl bug
340 Many of the changes included in this version originated in the CPAN modules
341 included in Perl's core. We're grateful to the entire CPAN community for
342 helping Perl to flourish.
344 For a more complete list of all of Perl's historical contributors, please see
345 the F<AUTHORS> file in the Perl source distribution.
347 =head1 Reporting Bugs
349 If you find what you think is a bug, you might check the articles
350 recently posted to the comp.lang.perl.misc newsgroup and the perl
351 bug database at http://rt.perl.org/perlbug/ . There may also be
352 information at http://www.perl.org/ , the Perl Home Page.
354 If you believe you have an unreported bug, please run the L<perlbug>
355 program included with your release. Be sure to trim your bug down
356 to a tiny but sufficient test case. Your bug report, along with the
357 output of C<perl -V>, will be sent off to perlbug@perl.org to be
358 analysed by the Perl porting team.
360 If the bug you are reporting has security implications, which make it
361 inappropriate to send to a publicly archived mailing list, then please send
362 it to perl5-security-report@perl.org. This points to a closed subscription
363 unarchived mailing list, which includes
364 all the core committers, who will be able
365 to help assess the impact of issues, figure out a resolution, and help
366 co-ordinate the release of patches to mitigate or fix the problem across all
367 platforms on which Perl is supported. Please only use this address for
368 security issues in the Perl core, not for modules independently
373 The F<Changes> file for an explanation of how to view exhaustive details
376 The F<INSTALL> file for how to build Perl.
378 The F<README> file for general stuff.
380 The F<Artistic> and F<Copying> files for copyright information.