updated perldelta

1 files changed, 93 insertions, 237 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index be5e23de59..3698326079 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -12,26 +12,8 @@ release.
 If you are upgrading from an earlier release such as 5.24.0, first read
 L<perl5250delta>, which describes differences between 5.24.0 and 5.25.0.
 
-=head1 Notice
-
-XXX Any important notices here
-
 =head1 Core Enhancements
 
-XXX New core language features go here.  Summarize user-visible core language
-enhancements.  Particularly prominent performance optimisations could go
-here, but most should go in the L</Performance Enhancements> section.
-
-[ List each enhancement as a =head2 entry ]
-
-=head1 Security
-
-XXX Any security-related notices go here.  In particular, any security
-vulnerabilities closed should be noted here rather than in the
-L</Selected Bug Fixes> section.
-
-[ List each security issue as a =head2 entry ]
-
 =head2 POSIX::tmpnam() has been removed
 
 The fundamentally unsafe C<tmpnam()> interface was deprecated in
@@ -74,157 +56,142 @@ to the language.  This usage has been deprecated since v5.22.
 The name of a character may no longer contain non-breaking spaces.  It
 has been deprecated to do so since Perl v5.22.
 
-=head1 Deprecations
+=head1 Performance Enhancements
 
-XXX Any deprecated features, syntax, modules etc. should be listed here.
+=over 4
 
-=head2 Module removals
+=item *
 
-XXX Remove this section if inapplicable.
+Bareword constant strings are now permitted to take part in constant
+folding. They were originally exempted from constant folding in August 1999,
+during the development of Perl 5.6, to ensure that C<use strict "subs">
+would still apply to bareword constants. That has now been accomplished a
+different way, so barewords, like other constants, now gain the performance
+benefits of constant folding.
+
+This also means that void-context warnings on constant expressions of
+barewords now report the folded constant operand, rather than the operation;
+this matches the behaviour for non-bareword constants.
 
-The following modules will be removed from the core distribution in a
-future release, and will at that time need to be installed from CPAN.
-Distributions on CPAN which require these modules will need to list them as
-prerequisites.
+=back
 
-The core versions of these modules will now issue C<"deprecated">-category
-warnings to alert you to this fact.  To silence these deprecation warnings,
-install the modules in question from CPAN.
+=head1 Modules and Pragmata
 
-Note that these are (with rare exceptions) fine modules that you are encouraged
-to continue to use.  Their disinclusion from core primarily hinges on their
-necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
-not usually on concerns over their design.
+=head2 Updated Modules and Pragmata
 
-=over
+=over 4
 
-=item XXX
+=item *
 
-XXX Note that deprecated modules should be listed here even if they are listed
-as an updated module in the L</Modules and Pragmata> section.
+L<Archive::Tar> has been upgraded from version 2.04 to 2.08.
 
-=back
+=item *
 
-[ List each other deprecation as a =head2 entry ]
+L<Carp> has been upgraded from version 1.40 to 1.41.
 
-=head1 Performance Enhancements
+=item *
 
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
+L<charnames> has been upgraded from version 1.43 to 1.44.
 
-[ List each enhancement as a =item entry ]
+=item *
 
-=over 4
+L<Config::Perl::V> has been upgraded from version 0.25 to 0.26.
 
 =item *
 
-Bareword constant strings are now permitted to take part in constant
-folding. They were originally exempted from constant folding in August 1999,
-during the development of Perl 5.6, to ensure that C<use strict "subs">
-would still apply to bareword constants. That has now been accomplished a
-different way, so barewords, like other constants, now gain the performance
-benefits of constant folding.
+L<DB_File> has been upgraded from version 1.835 to 1.838.
 
-This also means that void-context warnings on constant expressions of
-barewords now report the folded constant operand, rather than the operation;
-this matches the behaviour for non-bareword constants.
+=item *
 
-=back
+L<Digest::MD5> has been upgraded from version 2.54 to 2.55.
 
-=head1 Modules and Pragmata
+=item *
 
-XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
-go here.  If Module::CoreList is updated, generate an initial draft of the
-following sections using F<Porting/corelist-perldelta.pl>.  A paragraph summary
-for important changes should then be added by hand.  In an ideal world,
-dual-life modules would have a F<Changes> file that could be cribbed.
+L<IPC::Cmd> has been upgraded from version 0.92 to 0.94.
 
-[ Within each section, list entries as a =item entry ]
+=item *
 
-=head2 New Modules and Pragmata
+L<IPC::SysV> has been upgraded from version 2.06_01 to 2.07.
 
-=over 4
+=item *
+
+L<List::Util> has been upgraded from version 1.42_02 to 1.45_01.
 
 =item *
 
-XXX
+L<Locale::Codes> has been upgraded from version 3.37 to 3.38.
 
-=back
+=item *
 
-=head2 Updated Modules and Pragmata
+L<Locale::Maketext> has been upgraded from version 1.26 to 1.27.
 
-=over 4
+=item *
+
+L<Module::CoreList> has been upgraded from version 5.20160507 to 5.20160520.
+
+=item *
+
+L<Module::Metadata> has been upgraded from version 1.000031 to 1.000032.
 
 =item *
 
-L<POSIX> has been upgraded from version 1.66 to 1.69. This remedies several
+L<perlfaq> has been upgraded from version 5.021010 to 5.021011.
+
+=item *
+
+L<POSIX> has been upgraded from version 1.65 to 1.69. This remedies several
 defects in making its symbols exportable. [perl #127821]  Furthermore,
 the C<POSIX::tmpnam()> interface has been removed,
 see L</"POSIX::tmpnam() has been removed">.
 
-=back
-
-=head2 Removed Modules and Pragmata
+=item *
 
-=over 4
+L<re> has been upgraded from version 0.32 to 0.33.
 
 =item *
 
-XXX
+L<Scalar::Util> has been upgraded from version 1.42_02 to 1.45_01.
 
-=back
-
-=head1 Documentation
+=item *
 
-XXX Changes to files in F<pod/> go here.  Consider grouping entries by
-file and be sure to link to the appropriate page, e.g. L<perlfunc>.
+L<Sys::Syslog> has been upgraded from version 0.33 to 0.34.
 
-=head2 New Documentation
+=item *
 
-XXX Changes which create B<new> files in F<pod/> go here.
+L<Term::ANSIColor> has been upgraded from version 4.04 to 4.05.
 
-=head3 L<XXX>
+=item *
 
-XXX Description of the purpose of the new file here
+L<Test::Simple> has been upgraded from version 1.001014 to 1.302015.
 
-=head2 Changes to Existing Documentation
+=item *
 
-=over 4
+L<threads> has been upgraded from version 2.07 to 2.08. Compatibility
+with 5.8 has been restored.
 
 =item *
 
-Fixed link to Crosby paper on hash complexity attack in L<perlsec>.
+L<threads::shared> has been upgraded from version 1.51 to 1.52.
+Compatibility with 5.8 has been restored.
 
 =back
 
-XXX Changes which significantly change existing files in F<pod/> go here.
-However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
-section.
+=head1 Documentation
 
-=head3 L<XXX>
+=head2 Changes to Existing Documentation
 
 =over 4
 
 =item *
 
-XXX Description of the change here
+Fixed link to Crosby paper on hash complexity attack in L<perlsec>.
 
 =back
 
 =head1 Diagnostics
 
-The following additions or changes have been made to diagnostic output,
-including warnings and fatal error messages.  For the complete list of
-diagnostic messages, see L<perldiag>.
-
-XXX New or changed warnings emitted by the core's C<C> code go here.  Also
-include any changes in L<perldiag> that reconcile it to the C<C> code.
-
 =head2 New Diagnostics
 
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
-
 =head3 New Errors
 
 =over 4
@@ -247,20 +214,8 @@ L<Bareword in require must not start with a double-colon: "%s"|perldiag/"Barewor
 
 =back
 
-=head3 New Warnings
-
-=over 4
-
-=item *
-
-XXX L<message|perldiag/"message">
-
-=back
-
 =head2 Changes to Existing Diagnostics
 
-XXX Changes (i.e. rewording) of diagnostic messages go here
-
 =over 4
 
 =item *
@@ -285,13 +240,13 @@ been fixed.
 
 =item *
 
-C<< "string$scalar->$*" >> now correctly prefers concat overloading to
-string overlading if C<< $scalar->$* >> returns an overloaded object,
+C<< "string$scalar-E<gt>$*" >> now correctly prefers concat overloading to
+string overloading if C<< $scalar-E<gt>$* >> returns an overloaded object,
 bringing it into consistency with C<$$scalar>.
 
 =item *
 
-C<< /@0{0*->@*/*0 >> and similar contortions used to crash, but no longer
+C<< /@0{0*-E<gt>@*/*0 >> and similar contortions used to crash, but no longer
 do, but merely produce a syntax error. [perl #128171]
 
 =item *
@@ -304,13 +259,6 @@ fixed. [perl #128182]
 
 =head1 Utility Changes
 
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
-
-[ List utility changes as a =head2 entry for each utility and =item
-entries for each change
-Use L<XXX> with program names to get proper documentation linking. ]
-
 =head2 L<perlbug>
 
 =over 4
@@ -328,13 +276,6 @@ tests for perlbug. [perl #128020]
 
 =head1 Configuration and Compilation
 
-XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
-go here.  Any other changes to the Perl build process should be listed here.
-However, any platform-specific changes should be listed in the
-L</Platform Support> section, instead.
-
-[ List changes as a =item entry ].
-
 =over 4
 
 =item *
@@ -372,81 +313,8 @@ The build process no longer emits an extra blank line before building each
 
 =back
 
-=head1 Testing
-
-XXX Any significant changes to the testing of a freshly built perl should be
-listed here.  Changes which create B<new> files in F<t/> go here as do any
-large changes to the testing harness (e.g. when parallel testing was added).
-Changes to existing files in F<t/> aren't worth summarizing, although the bugs
-that they represent may be covered elsewhere.
-
-[ List each test improvement as a =item entry ]
-
-=over 4
-
-=item *
-
-XXX
-
-=back
-
-=head1 Platform Support
-
-XXX Any changes to platform support should be listed in the sections below.
-
-[ Within the sections, list each platform as a =item entry with specific
-changes as paragraphs below it. ]
-
-=head2 New Platforms
-
-XXX List any platforms that this version of perl compiles on, that previous
-versions did not.  These will either be enabled by new files in the F<hints/>
-directories, or new subdirectories and F<README> files at the top level of the
-source tree.
-
-=over 4
-
-=item XXX-some-platform
-
-XXX
-
-=back
-
-=head2 Discontinued Platforms
-
-XXX List any platforms that this version of perl no longer compiles on.
-
-=over 4
-
-=item XXX-some-platform
-
-XXX
-
-=back
-
-=head2 Platform-Specific Notes
-
-XXX List any changes for specific platforms.  This could include configuration
-and compilation changes or changes in portability/compatibility.  However,
-changes within modules for platforms should generally be listed in the
-L</Modules and Pragmata> section.
-
-=over 4
-
-=item XXX-some-platform
-
-XXX
-
-=back
-
 =head1 Internal Changes
 
-XXX Changes which affect the interface available to C<XS> code go here.  Other
-significant internal changes for future core maintainers should be noted as
-well.
-
-[ List each change as a =item entry ]
-
 =over 4
 
 =item *
@@ -463,11 +331,6 @@ build option does.
 
 =head1 Selected Bug Fixes
 
-XXX Important bug fixes in the core language are summarized here.  Bug fixes in
-files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
-
-[ List each fix as a =item entry ]
-
 =over 4
 
 =item *
@@ -493,43 +356,36 @@ longer causes crashes. [perl #128086]
 
 =back
 
-=head1 Known Problems
-
-XXX Descriptions of platform agnostic bugs we know we can't fix go here.  Any
-tests that had to be C<TODO>ed for the release would be noted here.  Unfixed
-platform specific bugs also go here.
-
-[ List each fix as a =item entry ]
-
-=over 4
-
-=item *
-
-XXX
-
-=back
-
-=head1 Errata From Previous Releases
-
-=over 4
-
-=item *
+=head1 Acknowledgements
 
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+Perl 5.25.1 represents approximately 2 weeks of development since Perl 5.25.0
+and contains approximately 46,000 lines of changes across 630 files from 24
+authors.
 
-=back
+Excluding auto-generated files, documentation and release tools, there were
+approximately 40,000 lines of changes to 510 .pm, .t, .c and .h files.
 
-=head1 Obituary
+Perl continues to flourish into its third decade thanks to a vibrant community
+of users and developers. The following people are known to have contributed the
+improvements that became Perl 5.25.1:
 
-XXX If any significant core contributor has died, we've added a short obituary
-here.
+Aaron Crane, Andreas Voegele, Chad Granum, Chris 'BinGOs' Williams, Craig A.
+Berry, David Mitchell, Doug Bell, Father Chrysostomos, H.Merijn Brand, Hugo van
+der Sanden, Jarkko Hietaniemi, Jerry D. Hedden, Jim Cromie, John Lightsey,
+Karen Etheridge, Karl Williamson, Lukas Mai, Maxwell Carey, Nicholas Clark,
+Niko Tyni, Ricardo Signes, Sawyer X, Tony Cook, Yves Orton.
 
-=head1 Acknowledgements
+The list above is almost certainly incomplete as it is automatically generated
+from version control history. In particular, it does not include the names of
+the (very much appreciated) contributors who reported issues to the Perl bug
+tracker.
 
-Generate this with:
+Many of the changes included in this version originated in the CPAN modules
+included in Perl's core. We're grateful to the entire CPAN community for
+helping Perl to flourish.
 
-  perl Porting/acknowledgements.pl v5.25.1..HEAD
+For a more complete list of all of Perl's historical contributors, please see
+the F<AUTHORS> file in the Perl source distribution.
 
 =head1 Reporting Bugs