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1=encoding utf8
2
3=head1 NAME
4
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5perldelta - what is new for perl v5.13.3
6
7=head1 DESCRIPTION
8
9This document describes differences between the 5.13.3 release and
10the 5.13.2 release.
11
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12If you are upgrading from an earlier release such as 5.13.1, first read
13L<perl5132delta>, which describes differences between 5.13.1 and
145.13.2.
855e1b21 15
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16=head1 Core Enhancements
17
09476ae3 18=head2 \o{...} for octals
f0a2b745 19
09476ae3 20There is a new escape sequence, C<"\o">, in double-quote-like contexts.
eba1105e 21It must be followed by braces enclosing an octal number of at least one
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22digit. It interpolates as the character with an ordinal value equal to
23the octal number. This construct allows large octal ordinals beyond the
24current max of 0777 to be represented. It also allows you to specify a
25character in octal which can safely be concatenated with other regex
26snippets and which won't be confused with being a backreference to
27a regex capture group. See L<perlre/Capture groups>.
f0a2b745 28
63098191 29=head2 C<\N{I<name>}> and C<charnames> enhancements
16036bcd 30
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31C<\N{}> and C<charnames::vianame> now know about the abbreviated
32character names listed by Unicode, such as NBSP, SHY, LRO, ZWJ, etc., as
33well as all the customary abbreviations for the C0 and C1 control
34characters (such as ACK, BEL, CAN, etc.), as well as a few new variants
35in common usage of some C1 full names.
16036bcd 36
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37In the past, it was ineffective to override one of Perl's abbreviations
38with your own custom alias. Now it works.
16036bcd 39
09476ae3 40You can also create a custom alias directly to the ordinal of a
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41character, known by C<\N{...}>, C<charnames::vianame()>, and
42C<charnames::viacode()>. Previously, an alias had to be to an official
43Unicode character name. This made it impossible to create an alias for
44a code point that had no name, such as the ones reserved for private
45use. So this change allows you to make more effective use of private
46use characters. Only if there is no official name will
47C<charnames::viacode()> return your custom one.
232cbbee
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48
49See L<charnames> for details on all these changes.
50
cdd0aa9c 51=head2 Uppercase X/B allowed in hexadecimal/binary literals
655d344e 52
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53Literals may now use either upper case C<0X...> or C<0B...> prefixes,
54in addition to the already supported C<0x...> and C<0b...>
0aefc26d 55syntax. (RT#76296) (a674e8d, 333f87f)
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56
57C, Ruby, Python and PHP already supported this syntax, and it makes
58Perl more internally consistent. A round-trip with C<eval sprintf
59"%#X", 0x10> now returns C<16> in addition to C<eval sprintf "%#x",
600x10>, which worked before.
efdecbbd 61
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62=head1 Incompatible Changes
63
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64=head2 \400 - \777
65
eba1105e 66Use of C<\400> - C<\777> in regexes in certain circumstances has given
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67different, anomalous behavior than their use in all other
68double-quote-like contexts. Since 5.10.1, a deprecated warning message
69has been raised when this happens. Now, all double-quote-like contexts
70have the same behavior, namely to be equivalent to C<\x{100}> -
71C<\x{1FF}>, with no deprecation warning. Use of these values in the
72command line option C<"-0"> retains the current meaning to slurp input
73files whole; previously, this was documented only for C<"-0777">. It is
74recommended, however, because of various ambiguities, to use the new
67c86580 75C<\o{...}> construct to represent characters in octal.
09476ae3 76(fa1639c..f6993e9).
fa1639c5 77
7ea08b87 78=head1 Deprecations
855e1b21 79
09476ae3 80=head2 Omitting a space between a regular expression and subsequent word
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81
82Omitting a space between a regex pattern or pattern modifiers and the
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83following word is deprecated. Deprecation for regular expression
84I<matches> was added in Perl 5.13.2. In this release, the deprecation
85is extended to regular expression I<substitutions>. For example,
a0316a43 86C<< s/foo/bar/sand $bar >> will still be parsed as
09476ae3 87C<< s/foo/bar/s and $bar >> but will issue a warning. (aa78b66)
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88
89=head2 Deprecation warning added for deprecated-in-core .pl libs
90
91This is a mandatory warning, not obeying -X or lexical warning bits.
92The warning is modelled on that supplied by deprecate.pm for
93deprecated-in-core .pm libraries. It points to the specific CPAN
94distribution that contains the .pl libraries. The CPAN version, of
95course, does not generate the warning. (0111154)
96
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97=head1 Performance Enhancements
98
655d344e 99There are several small optimizations to improve CPU cache performance
7ea08b87 100
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101=head1 Modules and Pragmata
102
7ea08b87 103=head2 Updated Modules and Pragmata
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104
105=over 4
106
d4f63867 107=item C<autodie>
7ea08b87 108
d4f63867 109Upgraded from version 2.06_01 to 2.10.
e8cfd41a 110
d4f63867 111=item C<charnames>
e8cfd41a 112
d4f63867 113Upgraded from version 1.08 to 1.10.
655d344e 114
d4f63867 115C<viacode()> is now significantly faster. (f3227b7)
655d344e 116
d4f63867 117=item C<lib>
a0316a43 118
d4f63867 119Upgraded from version 0.62 to 0.63.
a0316a43 120
d4f63867 121=item C<threads>
e8cfd41a 122
d4f63867 123Upgraded from version 1.77_02 to 1.77_03.
e8cfd41a 124
d4f63867 125=item C<threads::shared>
ca68faa2 126
d4f63867 127Upgraded from version 1.33_01 to 1.33_02.
ca68faa2 128
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129=item C<warnings>
130
131Upgraded from version 1.09 to 1.10.
132
133Calling C<use warnings> without arguments is now significantly more efficient.
134(8452af9)
135
136=item C<Archive::Extract>
137
138Upgraded from version 0.38 to 0.42.
ca68faa2 139
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140Updates since 0.38 include: a safe print method that guards
141Archive::Extract from changes to $\; a fix to the tests when run in core
142perl; support for TZ files; and a modification for the lzma logic to favour
143IO::Uncompress::Unlzma (d7f8799)
144
145=item C<Archive::Tar>
146
147Upgraded from version 1.54 to 1.64.
a0316a43 148
827ada3b 149Important changes since 1.54 include: compatibility with busybox
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150implementations of tar; a fix so that C<write()> and C<create_archive()>
151close only handles they opened; and a bug was fixed regarding the exit code
152of extract_archive. (afabe0e)
827ada3b 153
d4f63867 154=item C<Attribute::Handlers>
827ada3b 155
d4f63867 156Upgraded from version 0.87 to 0.88.
e8cfd41a 157
d4f63867 158=item C<Compress::Raw::Bzip2>
e8cfd41a 159
d4f63867 160Upgraded from version 2.024 to 2.027.
655d344e 161
d4f63867 162=item C<Compress::Raw::Zlib>
655d344e 163
d4f63867 164Upgraded from version 2.024 to 2.027_01.
655d344e 165
d4f63867 166=item C<Compress::Zlib>
655d344e 167
d4f63867 168Upgraded from version 2.024 to 2.027.
a0316a43 169
d4f63867 170=item C<CPANPLUS>
a0316a43 171
d4f63867 172Upgraded from version 0.90 to 0.9007.
a0316a43 173
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174Fixed the shell test to skip if test is not being run under a terminal;
175resolved the issue where a prereq on Config would not be recognised as a
176core module. (d4e225a)
a0316a43 177
d4f63867 178=item C<Digest::MD5>
a0316a43 179
d4f63867 180Upgraded from version 2.39 to 2.40.
2c1a561b 181
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182=item C<Digest::SHA>
183
184Upgraded from version 5.47 to 5.48.
185
186=item C<Exporter>
187
188Upgraded from version 5.64_02 to 5.64_03.
2c1a561b 189
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190Exporter no longer overrides C<$SIG{__WARN__}> (RT #74472) (9b86bb5)
191
d4f63867 192=item C<ExtUtils::CBuilder>
a0316a43 193
d4f63867 194Upgraded from version 0.27 to 0.2703.
e8cfd41a 195
d4f63867 196=item C<ExtUtils::Manifest>
e8cfd41a 197
d4f63867 198Upgraded from version 1.57 to 1.58.
e8cfd41a 199
d4f63867 200=item C<ExtUtils::ParseXS>
e8cfd41a 201
d4f63867 202Upgraded from version 2.2205 to 2.2206.
a0316a43 203
d4f63867 204=item C<File::Copy>
a0316a43 205
d4f63867 206Upgraded from version 2.19 to 2.20.
a0316a43 207
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208Skips suid tests on a nosuid partition. These tests were being skipped on
209OpenBSD, but nosuid partitions can exist on other systems too. Now it just
210checks if it can create a suid directory, if not the tests are skipped.
211Perl builds without errors in a nosuid /tmp with this patch. (cae9400)
abaa6e0e 212
d4f63867 213=item C<I18N::LangTags>
abaa6e0e 214
d4f63867 215Upgraded from version 0.35 to 0.35_01.
a0316a43 216
d4f63867 217=item C<IPC::Cmd>
655d344e 218
d4f63867 219Upgraded from version 0.58 to 0.60.
655d344e 220
d4f63867 221=item C<IPC::SysV>
a0316a43 222
d4f63867 223Upgraded from version 2.01 to 2.03.
a0316a43 224
d4f63867 225=item C<Locale::Maketext>
2d635dbf 226
d4f63867 227Upgraded from version 1.14 to 1.15.
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228
229Locale::Maketext guts have been merged back into the main module (87d86da)
230and adds external cache support (ace47d6)
231
d4f63867 232=item C<Module::Build>
2d635dbf 233
d4f63867 234Upgraded from version 0.3603 to 0.3607.
655d344e 235
d4f63867 236=item C<Module::CoreList>
655d344e 237
d4f63867 238Upgraded from version 2.34 to 2.36.
ee10537b 239
d4f63867 240=item C<Module::Load>
ee10537b 241
d4f63867 242Upgraded from version 0.16 to 0.18.
e417c914 243
d4f63867 244=item C<Term::ANSIColor>
e417c914 245
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246Upgraded from version 2.02 to 3.00.
247
248=item C<Test::Harness>
249
250Upgraded from version 3.17 to 3.21.
dd5f6923 251
fd63f474 252The core update from Test-Harness 3.17 to 3.21 fixed some things, but
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253also L<introduced a known problem|/"Known Problems"> with argument
254passing to non-Perl tests.
fd63f474 255
d4f63867 256=item C<Time::HiRes>
dd5f6923 257
d4f63867 258Upgraded from version 1.9719 to 1.9721.
e8cfd41a 259
d4f63867 260=item C<Time::Piece>
e8cfd41a 261
d4f63867 262Upgraded from version 1.15_01 to 1.20_01.
e8cfd41a 263
d4f63867 264=item C<Unicode::Collate>
e8cfd41a 265
d4f63867 266Upgraded from version 0.52_01 to 0.53.
e8cfd41a 267
d4f63867 268Includes Unicode Collation Algorithm 18 (74b94a7)
e8cfd41a 269
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270=item C<Unicode::Normalize>
271
272Upgraded from version 1.03 to 1.06.
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273
274=back
275
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276=head1 Documentation
277
7ea08b87 278=head2 New Documentation
855e1b21 279
a0316a43 280=head3 L<perl5121delta>
855e1b21 281
655d344e 282The Perl 5.12.1 perldelta file was added from the Perl maintenance branch
855e1b21 283
7ea08b87 284=head2 Changes to Existing Documentation
855e1b21 285
a0316a43 286=head3 General changes
655d344e 287
a0316a43 288=over
855e1b21 289
655d344e 290=item *
855e1b21 291
09476ae3 292Octal character escapes in documentation now prefer a three-digit octal
67c86580 293escape or the new C<\o{...}> escape as they have more consistent behavior
cdd0aa9c 294in different contexts than other forms. (ce7b6f0) (d8b950d) (e1f120a)
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295
296=item *
297
298Documentation now standardizes on the term 'capture group' over 'buffer'
cdd0aa9c 299in regular expression documentation (c27a5cf)
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300
301=back
302
303=head3 L<perlfunc>
304
305=over
306
307=item *
308
309Added cautionary note about "no VERSION" (e0de7c2)
310
311=item *
312
09476ae3 313Added additional notes regarding srand when forking (d460397)
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314
315=back
316
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317=head3 L<perlop>
318
319=over 4
320
321=item *
322
767b1673 323Improved documentation of unusual character escapes (4068718, 9644846)
a0316a43 324
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325=item *
326
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327Clarified how hexadecimal escapes are interpreted, with particular
328attention to the treatment of invalid characters (9644846)
cdd0aa9c 329
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330=back
331
332=head3 L<perlrun>
333
334=over
335
336=item *
337
09476ae3 338Clarified the behavior of the C<-0NNN> switch for C<-0400> or higher (7ba31cb)
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339
340=back
341
342=head3 L<perlpolicy>
343
344=over
345
346=item *
347
348Added the policy on compatibility and deprecation along with definitions of
349terms like "deprecation" (70e4a83)
350
351=back
352
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353=head3 L<perlre>
354
355=over
356
357=item *
358
09476ae3 359Added examples of the perils of not using \g{} when there are more
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360than nine back-references (9d86067)
361
362=back
363
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364=head3 L<perltie>
365
366=over
367
368=item *
369
09476ae3 370Updated some examples for modern Perl style (67d00dd)
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371
372=back
373
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374=head1 Utility Changes
375
a0316a43 376=head3 L<perldb>
7ea08b87 377
a0316a43 378=over
7ea08b87 379
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380=item *
381
382The remote terminal works after forking and spawns new sessions - one
09476ae3 383for each forked process (11653f7)
976a3bea 384
09476ae3 385=item *
855e1b21 386
a0316a43 387Uses the less pager path from Config instead of searching for it (bf320d6)
855e1b21 388
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389=back
390
391=head1 Configuration and Compilation
392
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393=over 4
394
7ea08b87 395=item *
855e1b21 396
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397Adjusted 'make test.valgrind' to account for cpan/dist/ext separation
398(e07ce2e)
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399
400=back
401
7ea08b87 402=head1 Testing
855e1b21 403
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404=over 4
405
406=item *
407
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408F<t/harness> clears PERL5LIB, PERLLIB, PERL5OPT as t/TEST does (a2d3de1)
409
410=item *
411
412Many common testing routines were refactored into t/lib/common.pl
413
414=item *
415
416Several test files have been modernized to use Test::More
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417
418=back
419
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420=head1 Platform Support
421
7ea08b87 422=head2 Discontinued Platforms
855e1b21 423
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424=over 4
425
e8cfd41a 426=item MacOS Classic
855e1b21 427
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428Support for MacOS Classic within ExtUtils::MakeMaker was removed from Perl in
429December 2004. Vestigial MacOS Classic specific code has now been removed
09476ae3 430from other core modules as well (8f8c2a4..c457df0)
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431
432=back
433
7ea08b87 434=head2 Platform-Specific Notes
855e1b21 435
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436=over 4
437
a0316a43 438=item Win32
855e1b21 439
a0316a43 440t/io/openpid.t now uses the alarm() watchdog strategy for more
09476ae3 441robustness (5732108)
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442
443=back
444
7ea08b87 445=head1 Internal Changes
855e1b21 446
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447=over 4
448
449=item *
450
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451Under some circumstances, the C<CvGV()> field of a CV is now reference
452counted. To ensure consistent behaviour, direct assignment to it, for
453example C<CvGV(cv) = gv> is now a compile-time error. A new macro,
454C<CvGV_set(cv,gv)> has been introduced to perform this operation safely.
455Note that modification of this field is not part of of the public API,
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456regardless of this new macro. This change caused some
457L<issues|/"Known Problems"> in modules that used the private C<GvGV()>
458field.
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459
460=item *
461
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462It is now possible for XS code to hook into Perl's lexical scope
463mechanism at compile time, using the new C<Perl_blockhook_register>
464function. See L<perlguts/"Compile-time scope hooks">.
855e1b21 465
a0316a43 466=item *
855e1b21 467
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468Added C<Perl_croak_no_modify()> to implement
469C<Perl_croak("%s", PL_no_modify)> (6ad8f25)
efdecbbd 470
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471=item *
472
09476ae3 473Added prototypes for C<tie()> and C<untie()> to allow overloading (RT#75902)
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474(1db4d19)
475
09476ae3 476=item *
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477
478Adds C<my_[l]stat_flags()> to replace C<my_[l]stat()>. C<my_stat()> and
479C<my_lstat()> call get magic on the stack arg, so create C<_flags()>
480variants that allow us to control this. (0d7d409)
655d344e 481
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482=back
483
7ea08b87 484=head1 Selected Bug Fixes
855e1b21 485
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486=over 4
487
488=item *
489
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490Some work has been done on the internal pointers that link between symbol
491tables (stashes), typeglobs and subroutines. This has the effect that
492various edge cases related to deleting stashes or stash entries (e.g.
493<%FOO:: = ()>), and complex typeglob or code reference aliasing, will no
494longer crash the interpreter.
495
496=item *
497
976a3bea 498Fixed readline() when interrupted by signals so it no longer returns
09476ae3 499the "same thing" as before or random memory
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500
501=item *
502
e8cfd41a 503Fixed a regression of kill() when a match variable is used for the
09476ae3 504process ID to kill (RT#75812) (8af710e)
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505
506=item *
507
508Fixed several subtle bugs in sort() when @_ is accessed within a subroutine
09476ae3 509used for sorting (RT#72334) (8f443ca)
e8cfd41a 510
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511=item *
512
513Catch yyparse() exceptions in C<< (?{...}) >> (RT#2353) (634d691)
514
515=item *
516
517Avoid UTF-8 cache panics with offsets beyond a string (RT #75898) (3e2d381)
518
519=item *
520
521Fixed POSIX::strftime memory leak (RT#73520) (c4bc4aa)
522
523=item *
524
09476ae3 525Doesn't set strict with C<no VERSION> if C<VERSION> is greater than 5.12
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526(da8fb5d)
527
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528=item *
529
530Avoids multiple FETCH/stringify on filetest ops (40c852d)
531
532=item *
533
534Fixed issue with string C<eval> not detecting taint of overloaded/tied
535arguments (RT #75716) (895b760)
536
537=item *
538
539Fix potential crashes of string C<eval> when evaluating a object with
540overloaded stringification by creating a stringified copy when necessary
541(3e5c018)
542
543=item *
544
545Fixed bug where overloaded stringification could remove tainting
546(RT #75716) (a02ec77)
547
548=item *
549
550Plugs more memory leaks in vms.c. (9e2bec0)
551
552=item *
553
554Fix pthread include error for Time::Piece (e9f284c)
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555
556=back
557
7ea08b87 558=head1 Known Problems
855e1b21 559
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560=over 4
561
562=item *
563
eba1105e 564Bug fixes involving CvGV reference counting break Sub::Name. A
09476ae3 565patch has been sent upstream to the maintainer
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566
567=item *
568
976a3bea 569readline() returns an empty string instead of undef when it is
09476ae3 570interrupted by a signal
7ea08b87 571
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572=item *
573
574Test-Harness was updated from 3.17 to 3.21 for this release. A rewrite
09476ae3 575in how it handles non-Perl tests (in 3.17_01) broke argument passing to
3f9b37f9 576non-Perl tests with L<prove> (RT #59186), and required that non-Perl
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577tests be run as C<prove ./test.sh> instead of C<prove test.sh> These
578issues are being solved upstream, but didn't make it into this release.
579They're expected to be fixed in time for perl v5.13.4. (RT #59457)
fd63f474 580
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581=item *
582
583C<version> now prevents object methods from being called as class methods
584(d808b68)
585
7ea08b87 586=back
855e1b21 587
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588=head1 Errata
589
590=over 4
591
592=item *
593
594Retroactively added the Acknowledgements list to L<perl5132delta>,
595which was excluded in the original release (d1e2db0)
596
597=back
598
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599=head1 Acknowledgements
600
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601Perl 5.13.3 represents approximately one month of development since Perl
6025.13.2, and contains 12,184 lines of changes across 575 files from 104
603authors and committers.
604
605Thank you to the following for contributing to this release:
606
607Abhijit Menon-Sen, Abigail, Alex Davies, Alex Vandiver, Alexandr
608Ciornii, Andreas J. Koenig, Andrew Rodland, Andy Dougherty, Aristotle
609Pagaltzis, Arkturuz, Ben Morrow, Bo Borgerson, Bo Lindbergh, Brad
610Gilbert, Bram, Brian Phillips, Chas. Owens, Chip Salzenberg, Chris
611Williams, Craig A. Berry, Curtis Jewell, Dan Dascalescu, Daniel
612Frederick Crisman, Dave Rolsky, David Caldwell, David E. Wheeler, David
613Golden, David Leadbeater, David Mitchell, Dennis Kaarsemaker, Eric
614Brine, Father Chrysostomos, Florian Ragwitz, Frank Wiegand, Gene
615Sullivan, George Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Graham
616Barr, H.Merijn Brand, Harmen, Hugo van der Sanden, James E Keenan, James
617Mastros, Jan Dubois, Jerry D. Hedden, Jesse Vincent, Jim Cromie, John
618Peacock, Jos Boumans, Josh ben Jore, Karl Williamson, Kevin Ryde, Leon
619Brocard, Lubomir Rintel, Maik Hentsche, Marcus Holland-Moritz, Matt
620Johnson, Matt S Trout, Max Maischein, Michael Breen, Michael G Schwern,
621Moritz Lenz, Nga Tang Chan, Nicholas Clark, Nick Cleaton, Nick Johnston,
622Niko Tyni, Offer Kaye, Paul Marquess, Philip Hazel, Philippe Bruhat,
623Rafael Garcia-Suarez, Rainer Tammer, Reini Urban, Ricardo Signes,
624Richard Soderberg, Robin Barker, Ruslan Zakirov, Salvador Fandino,
625Salvador Ortiz Garcia, Shlomi Fish, Sinan Unur, Sisyphus, Slaven Rezic,
626Steffen Mueller, Stepan Kasal, Steve Hay, Steve Peters, Sullivan Beck,
627Tim Bunce, Todd Rinaldo, Tom Christiansen, Tom Hukins, Tony Cook,
628Vincent Pit, Yuval Kogman, Yves Orton, Zefram, brian d foy, chromatic,
629kmx, Ævar Arnfjörð Bjarmason
855e1b21 630
855e1b21
NC
631=head1 Reporting Bugs
632
633If you find what you think is a bug, you might check the articles
634recently posted to the comp.lang.perl.misc newsgroup and the perl
635bug database at http://rt.perl.org/perlbug/ . There may also be
636information at http://www.perl.org/ , the Perl Home Page.
637
638If you believe you have an unreported bug, please run the B<perlbug>
639program included with your release. Be sure to trim your bug down
640to a tiny but sufficient test case. Your bug report, along with the
641output of C<perl -V>, will be sent off to perlbug@perl.org to be
642analysed by the Perl porting team.
643
644If the bug you are reporting has security implications, which make it
645inappropriate to send to a publicly archived mailing list, then please send
646it to perl5-security-report@perl.org. This points to a closed subscription
647unarchived mailing list, which includes all the core committers, who be able
648to help assess the impact of issues, figure out a resolution, and help
649co-ordinate the release of patches to mitigate or fix the problem across all
650platforms on which Perl is supported. Please only use this address for
651security issues in the Perl core, not for modules independently
652distributed on CPAN.
653
654=head1 SEE ALSO
655
656The F<Changes> file for an explanation of how to view exhaustive details
657on what changed.
658
659The F<INSTALL> file for how to build Perl.
660
661The F<README> file for general stuff.
662
663The F<Artistic> and F<Copying> files for copyright information.
664
665=cut