5 [ this is a template for a new perldelta file. Any text flagged as XXX needs
6 to be processed before release. ]
8 perldelta - what is new for perl v5.21.3
12 This document describes differences between the 5.21.2 release and the 5.21.3
15 If you are upgrading from an earlier release such as 5.21.1, first read
16 L<perl5212delta>, which describes differences between 5.21.1 and 5.21.2.
20 XXX Any important notices here
22 =head1 Core Enhancements
24 =head2 C<defined(@array = LIST)> is no longer fatal
26 In 5.21.1, C<defined(@array)> was made fatal. This has been relaxed
27 to not die if the argument is assigning to an array.
31 =head2 The L<Safe> module could allow outside packages to be replaced
33 Critical bugfix: outside packages could be replaced. L<Safe> has
34 been patched to 2.38 to address this.
36 =head1 Incompatible Changes
38 =head2 S<C<use UNIVERSAL '...'>> is now a fatal error
40 Importing functions from C<UNIVERSAL> has been deprecated since v5.12, and
41 is now a fatal error. S<C<"use UNIVERSAL">> without any arguments is still
46 XXX Any deprecated features, syntax, modules etc. should be listed here.
48 [ List each other deprecation as a =head2 entry ]
50 =head1 Performance Enhancements
52 XXX Changes which enhance performance without changing behaviour go here.
53 There may well be none in a stable release.
55 [ List each enhancement as a =item entry ]
65 =head1 Modules and Pragmata
67 =head2 Updated Modules and Pragmata
73 L<B::Debug> has been upgraded from version 1.19 to 1.21
77 L<Config::Perl::V> has been upgraded from version 0.20 to 0.22.
81 L<CPAN::Meta> has been upgraded from version 2.141520 to 2.142060.
85 L<CPAN::Meta::Requirements> has been upgraded from version 2.125 to 2.126.
89 L<ExtUtils::Manifest> has been upgraded from version 1.64 to 1.65.
91 The MANIFEST is now opened with C<:raw>, to prevent C<CRLF>s leaking in.
95 L<HTTP::Tiny> has been upgraded from version 0.043 to 0.047.
99 L<perl5db.pl> has been upgraded from version 1.45 to 1.46.
101 Fixed the scope level handling of the debugger's C<y> command.
105 L<POSIX> has been upgraded from version 1.41 to 1.42.
107 Replaced the thread-unsafe code used to prevent duplicate warning
108 messages for using the isxxx() functions. [perl #122476]
112 L<Safe> has been upgraded from version 2.37 to 2.38.
114 Critical bugfix: outside packages could be replaced.
118 L<Socket> has been upgraded from version 2.014 to 2.015.
120 Test suite updates, particularly useful for Solaris and cygwin, and
121 a slight change to the pattern used for IPv4 address matching.
127 XXX Changes to files in F<pod/> go here. Consider grouping entries by
128 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
130 =head2 Changes to Existing Documentation
132 XXX Changes which significantly change existing files in F<pod/> go here.
133 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
142 XXX Description of the change here
148 The following additions or changes have been made to diagnostic output,
149 including warnings and fatal error messages. For the complete list of
150 diagnostic messages, see L<perldiag>.
152 XXX New or changed warnings emitted by the core's C<C> code go here. Also
153 include any changes in L<perldiag> that reconcile it to the C<C> code.
155 =head2 New Diagnostics
157 XXX Newly added diagnostic messages go under here, separated into New Errors
166 XXX L<message|perldiag/"message">
176 L<Hexadecimal float: exponent overflow|perldiag/"Hexadecimal float: exponent overflow">
178 (W overflow) The hexadecimal floating point has larger exponent
179 than the floating point supports.
183 L<Hexadecimal float: exponent underflow|perldiag/"Hexadecimal float: exponent underflow">
185 (W overflow) The hexadecimal floating point has smaller exponent
186 than the floating point supports.
190 L<Hexadecimal float: internal error|perldiag/"Hexadecimal float: internal error">
192 (F) Something went horribly bad in hexadecimal float handling.
196 L<Hexadecimal float: mantissa overflow|perldiag/"Hexadecimal float: mantissa overflow">
198 (W overflow) The hexadecimal floating point literal had more bits in
199 the mantissa (the part between the 0x and the exponent, also known as
200 the fraction or the significand) than the floating point supports.
204 L<Hexadecimal float: precision loss|perldiag/"Hexadecimal float: precision loss">
206 (W overflow) The hexadecimal floating point had internally more
207 digits than could be output. This can be caused by unsupported
208 long double formats, or by 64-bit integers not being available
209 (needed to retrieve the digits under some configurations).
213 L<Hexadecimal float: unsupported long double format|perldiag/"Hexadecimal float: unsupported long double format">
215 (F) You have configured Perl to use long doubles but
216 the internals of the long double format are unknown,
217 therefore the hexadecimal float output is impossible.
221 =head2 Changes to Existing Diagnostics
223 XXX Changes (i.e. rewording) of diagnostic messages go here
229 XXX Describe change here
233 =head1 Configuration and Compilation
235 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
236 go here. Any other changes to the Perl build process should be listed here.
237 However, any platform-specific changes should be listed in the
238 L</Platform Support> section, instead.
240 [ List changes as a =item entry ].
246 Internal handling of floating point values has been improved.
252 XXX Any significant changes to the testing of a freshly built perl should be
253 listed here. Changes which create B<new> files in F<t/> go here as do any
254 large changes to the testing harness (e.g. when parallel testing was added).
255 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
256 that they represent may be covered elsewhere.
258 [ List each test improvement as a =item entry ]
268 =head1 Platform Support
270 XXX Any changes to platform support should be listed in the sections below.
272 [ Within the sections, list each platform as a =item entry with specific
273 changes as paragraphs below it. ]
275 =head2 Platform-Specific Notes
277 XXX List any changes for specific platforms. This could include configuration
278 and compilation changes or changes in portability/compatibility. However,
279 changes within modules for platforms should generally be listed in the
280 L</Modules and Pragmata> section.
284 =item XXX-some-platform
290 =head1 Internal Changes
292 XXX Changes which affect the interface available to C<XS> code go here. Other
293 significant internal changes for future core maintainers should be noted as
296 [ List each change as a =item entry ]
302 Added L<perlapi/sync_locale>.
303 Changing the program's locale should be avoided by XS code. Nevertheless,
304 certain non-Perl libraries called from XS, such as C<Gtk> do so. When this
305 happens, Perl needs to be told that the locale has changed. Use this function
306 to do so, before returning to Perl.
310 =head1 Selected Bug Fixes
312 XXX Important bug fixes in the core language are summarized here. Bug fixes in
313 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
315 [ List each fix as a =item entry ]
321 Failing to compile C<use Foo> in an eval could leave a spurious
322 C<BEGIN> subroutine definition, which would produce a "Subroutine
323 BEGIN redefined" warning on the next use of C<use>, or other C<BEGIN>
324 block. [perl #122107]
328 C<method { BLOCK } ARGS> syntax now correctly parses the arguments if they
329 begin with an opening brace. [perl #46947]
333 =head1 Known Problems
335 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
336 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
337 platform specific bugs also go here.
339 [ List each fix as a =item entry ]
349 =head1 Errata From Previous Releases
355 XXX Add anything here that we forgot to add, or were mistaken about, in
356 the perldelta of a previous release.
360 =head1 Acknowledgements
362 XXX Generate this with:
364 perl Porting/acknowledgements.pl v5.21.2..HEAD
366 =head1 Reporting Bugs
368 If you find what you think is a bug, you might check the articles recently
369 posted to the comp.lang.perl.misc newsgroup and the perl bug database at
370 https://rt.perl.org/ . There may also be information at
371 http://www.perl.org/ , the Perl Home Page.
373 If you believe you have an unreported bug, please run the L<perlbug> program
374 included with your release. Be sure to trim your bug down to a tiny but
375 sufficient test case. Your bug report, along with the output of C<perl -V>,
376 will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
378 If the bug you are reporting has security implications, which make it
379 inappropriate to send to a publicly archived mailing list, then please send it
380 to perl5-security-report@perl.org. This points to a closed subscription
381 unarchived mailing list, which includes all the core committers, who will be
382 able to help assess the impact of issues, figure out a resolution, and help
383 co-ordinate the release of patches to mitigate or fix the problem across all
384 platforms on which Perl is supported. Please only use this address for
385 security issues in the Perl core, not for modules independently distributed on
390 The F<Changes> file for an explanation of how to view exhaustive details on
393 The F<INSTALL> file for how to build Perl.
395 The F<README> file for general stuff.
397 The F<Artistic> and F<Copying> files for copyright information.