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document revert of 'local $tied' change
[perl5.git] / pod / perl5132delta.pod
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1=encoding utf8
2
3=head1 NAME
4
5perldelta - what is new for perl v5.13.2
6
7=head1 DESCRIPTION
8
9This document describes differences between the 5.13.2 release and
10the 5.13.1 release.
11
12If you are upgrading from an earlier release such as 5.10, first read
13L<perl5120delta>, which describes differences between 5.10 and
145.12.
15
16=head1 Notice
17
18XXX Any important notices here
19
20=head1 Incompatible Changes
21
5f3e44b6 22=head2 localised tied scalars are tied again.
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24The change in behaviour in 5.13.1 of localising tied scalar values has
25been reverted to the existing 5.12.0 and earlier behaviour (the change for
26arrays and hashes remains).
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27
28=head1 Core Enhancements
29
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.
33
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34=head2 Non-destructive substitution
35
36The substitution operator now supports a C</r> option that
37copies the input variable, carries out the substitution on
38the copy and returns the result. The original remains unmodified.
39
40 my $old = 'cat';
41 my $new = $old =~ s/cat/dog/r;
42 # $old is 'cat' and $new is 'dog'
43
44This is particularly useful with C<map>. See L<perlop> for more examples.
45
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46=head2 package block syntax
47
48A package declaration can now contain a code block, in which case the
49declaration is in scope only inside that block. So C<package Foo { ... }>
50is precisely equivalent to C<{ package Foo; ... }>. It also works with
51a version number in the declaration, as in C<package Foo 1.2 { ... }>.
52See L<perlfunc>.
53
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54=head1 New Platforms
55
56XXX List any platforms that this version of perl compiles on, that previous
57versions did not. These will either be enabled by new files in the F<hints/>
58directories, or new subdirectories and F<README> files at the top level of the
59source tree.
60
61=head1 Modules and Pragmata
62
63XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
64go here. If Module::CoreList is updated, generate an initial draft of the
65following sections using F<Porting/corelist-perldelta.pl>, which prints stub
66entries to STDOUT. Results can be pasted in place of the '=head2' entries
67below. A paragraph summary for important changes should then be added by hand.
68In an ideal world, dual-life modules would have a F<Changes> file that could be
69cribbed.
70
71=head2 New Modules and Pragmata
72
73=head2 Pragmata Changes
74
75=head2 Updated Modules
76
77=head2 Removed Modules and Pragmata
78
79=head1 Utility Changes
80
81XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
82here. Most of these are built within the directories F<utils> and F<x2p>.
83
84=over 4
85
86=item F<XXX>
87
88XXX
89
90=back
91
92=head1 New Documentation
93
94XXX Changes which create B<new> files in F<pod/> go here.
95
96=over 4
97
98=item L<XXX>
99
100XXX
101
102=back
103
104=head1 Changes to Existing Documentation
105
106XXX Changes which significantly change existing files in F<pod/> go here.
107Any changes to F<pod/perldiag.pod> should go in L</New or Changed Diagnostics>.
108
109
110=head1 Performance Enhancements
111
112XXX Changes which enhance performance without changing behaviour go here. There
113may well be none in a stable release.
114
115=over 4
116
117=item *
118
119XXX
120
121=back
122
123=head1 Installation and Configuration Improvements
124
125XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
126go here.
127
128=head2 Configuration improvements
129
130XXX
131
132=head2 Compilation improvements
133
134XXX
135
136=head2 Platform Specific Changes
137
138=over 4
139
140=item XXX-some-platform
141
142XXX
143
144=back
145
146=head1 Selected Bug Fixes
147
148XXX Important bug fixes in the core language are summarised here.
149Bug fixes in files in F<ext/> and F<lib/> are best summarised in
150L</Modules and Pragmata>.
151
152=over 4
153
154=item *
155
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156Overloading now works properly in conjunction with tied variables. What
157formerly happened was that most ops checked their arguments for overloading
158I<before> checking for magic, so for example an overloaded object returned
159by a tied array access would usually be treated as not overloaded
160(RT #57012).
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161
162=back
163
164=head1 New or Changed Diagnostics
165
166XXX New or changed warnings emitted by the core's C<C> code go here.
167
168=over 4
169
170=item C<XXX>
171
172XXX
173
174=back
175
176=head1 Changed Internals
177
178XXX Changes which affect the interface available to C<XS> code go here.
179
180=over 4
181
182=item *
183
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184The C<fund_rundefsvoffset> function has been deprecated. It appeared that
185its design was insufficient to reliably get the lexical C<$_> at run-time.
186
187Use the new C<find_rundefsv> function or the C<UNDERBAR> macro instead.
188They directly return the right SV representing C<$_>, whether it's lexical
189or dynamic.
190
191=item *
192
ebe8e111 193The following new functions or macros have been added to the public API:
789bd863 194C<SvNV_nomg>, C<sv_2nv_flags>, C<find_rundefsv>.
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196=item *
197
198The C<UNDERBAR> macro now calls C<find_rundefsv>. C<dUNDERBAR> is now a
199noop but should still be used to ensure past and future compatibility.
200
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201=back
202
203=head1 New Tests
204
205XXX Changes which create B<new> files in F<t/> go here. Changes to
206existing files in F<t/> aren't worth summarising, although the bugs that
207they represent may be.
208
209=over 4
210
211=item F<XXX>
212
213XXX
214
215=back
216
217=head1 Known Problems
218
219XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
220tests that had to be C<TODO>ed for the release would be noted here, unless
221they were specific to a particular platform (see below).
222
223This is a list of some significant unfixed bugs, which are regressions
224from either 5.XXX.XXX or 5.XXX.XXX.
225
226=over 4
227
228=item *
229
230XXX
231
232=back
233
234=head1 Deprecations
235
236XXX Add any new known deprecations here.
237
238The following items are now deprecated.
239
240=over 4
241
242=item *
243
244XXX
245
246=back
247
248=head1 Platform Specific Notes
249
250XXX Any changes specific to a particular platform. VMS and Win32 are the usual
251stars here. It's probably best to group changes under the same section layout
252as the main perldelta
253
254=head1 Obituary
255
256XXX If any significant core contributor has died, we've added a short obituary
257here.
258
259=head1 Acknowledgements
260
261XXX The list of people to thank goes here.
262
263
264=head1 Reporting Bugs
265
266If you find what you think is a bug, you might check the articles
267recently posted to the comp.lang.perl.misc newsgroup and the perl
268bug database at http://rt.perl.org/perlbug/ . There may also be
269information at http://www.perl.org/ , the Perl Home Page.
270
271If you believe you have an unreported bug, please run the B<perlbug>
272program included with your release. Be sure to trim your bug down
273to a tiny but sufficient test case. Your bug report, along with the
274output of C<perl -V>, will be sent off to perlbug@perl.org to be
275analysed by the Perl porting team.
276
277If the bug you are reporting has security implications, which make it
278inappropriate to send to a publicly archived mailing list, then please send
279it to perl5-security-report@perl.org. This points to a closed subscription
280unarchived mailing list, which includes all the core committers, who be able
281to help assess the impact of issues, figure out a resolution, and help
282co-ordinate the release of patches to mitigate or fix the problem across all
283platforms on which Perl is supported. Please only use this address for
284security issues in the Perl core, not for modules independently
285distributed on CPAN.
286
287=head1 SEE ALSO
288
289The F<Changes> file for an explanation of how to view exhaustive details
290on what changed.
291
292The F<INSTALL> file for how to build Perl.
293
294The F<README> file for general stuff.
295
296The F<Artistic> and F<Copying> files for copyright information.
297
298=cut