Create a perldelta for 5.15.9

10 files changed, 595 insertions, 193 deletions

diff --git a/MANIFEST b/MANIFEST
index f48957d246..646fc80534 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -4649,6 +4649,7 @@ pod/perl5155delta.pod		Perl changes in version 5.15.5
 pod/perl5156delta.pod		Perl changes in version 5.15.6
 pod/perl5157delta.pod		Perl changes in version 5.15.7
 pod/perl5158delta.pod		Perl changes in version 5.15.8
+pod/perl5159delta.pod		Perl changes in version 5.15.9
 pod/perl561delta.pod		Perl changes in version 5.6.1
 pod/perl56delta.pod		Perl changes in version 5.6
 pod/perl581delta.pod		Perl changes in version 5.8.1
diff --git a/Makefile.SH b/Makefile.SH
index d1ac0b826b..ba5ab79d3a 100755
--- a/Makefile.SH
+++ b/Makefile.SH
@@ -482,7 +482,7 @@ mini_obj = $(minindt_obj) $(MINIDTRACE_O)
 ndt_obj = $(obj0) $(obj1) $(obj2) $(obj3) $(ARCHOBJS)
 obj = $(ndt_obj) $(DTRACE_O)
 
-perltoc_pod_prereqs = extra.pods pod/perl5159delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
+perltoc_pod_prereqs = extra.pods pod/perl51510delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
 generated_pods = pod/perltoc.pod $(perltoc_pod_prereqs)
 generated_headers = uudmap.h bitcount.h mg_data.h
 
@@ -1058,8 +1058,8 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc
 pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST
 	$(MINIPERL) $(Icwd) pod/perlmodlib.PL -q
 
-pod/perl5159delta.pod: pod/perldelta.pod
-	$(LNS) perldelta.pod pod/perl5159delta.pod
+pod/perl51510delta.pod: pod/perldelta.pod
+	$(LNS) perldelta.pod pod/perl51510delta.pod
 
 extra.pods: $(MINIPERL_EXE)
 	-@test ! -f extra.pods || rm -f `cat extra.pods`
diff --git a/pod/.gitignore b/pod/.gitignore
index bedcd69263..8af69a1baf 100644
--- a/pod/.gitignore
+++ b/pod/.gitignore
@@ -59,7 +59,7 @@
 /roffitall
 
 # generated
-/perl5159delta.pod
+/perl51510delta.pod
 /perlapi.pod
 /perlintern.pod
 *.html
diff --git a/pod/perl.pod b/pod/perl.pod
index 4600989bf9..108535a152 100644
--- a/pod/perl.pod
+++ b/pod/perl.pod
@@ -177,6 +177,7 @@ aux a2p c2ph h2ph h2xs perlbug pl2pm pod2html pod2man s2p splain xsubpp
 
     perlhist		Perl history records
     perldelta		Perl changes since previous version
+    perl5159delta	Perl changes in version 5.15.9
     perl5158delta	Perl changes in version 5.15.8
     perl5157delta	Perl changes in version 5.15.7
     perl5156delta	Perl changes in version 5.15.6
diff --git a/pod/perl5159delta.pod b/pod/perl5159delta.pod
new file mode 100644
index 0000000000..25e0c4f1af
--- /dev/null
+++ b/pod/perl5159delta.pod
@@ -0,0 +1,402 @@
+=encoding utf8
+
+=head1 NAME
+
+perl5159delta - what is new for perl v5.15.9
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.15.8 release and
+the 5.15.9 release.
+
+If you are upgrading from an earlier release such as 5.15.7, first read
+L<perl5158delta>, which describes differences between 5.15.7 and
+5.15.8.
+
+=head1 Notice
+
+This space intentionally left blank.
+
+=head1 Core Enhancements
+
+=head2 C<< no feature; >> now means reset to default
+
+C<< no feature >> now resets to the default feature set.  To disable all
+features (which is likely to be a pretty special-purpose request, since
+it presumably won't match any named set of semantics) you can now  
+write C<< no feature ':all' >>.
+
+=head1 Security
+
+=head2 Malformed UTF-8 input could cause attempts to read beyond the end of the buffer
+
+Two new XS-accessible functions, C<utf8_to_uvchr_buf()> and
+C<utf8_to_uvuni_buf()> are now available to prevent this, and the Perl
+core has been converted to use them.
+See L</Internal Changes>.
+
+=head1 Incompatible Changes
+
+=head2 C<< no feature; >>
+
+C<no feature;> now means reset to default.
+
+=head1 Deprecations
+
+=head2 Literal C<< "{" >> characters in regular expressions.
+
+It has been documented that the current plans include requiring a
+literal C<< "{" >> to be escaped: 5.18 will emit deprecation warnings,
+and it will be required in 5.20.
+
+=head2 XS functions C<utf8_to_uvchr()> and C<utf8_to_uvuni()>
+
+Use C<utf8_to_uvchr_buf()> and C<utf8_to_uvuni_buf()> instead.
+See L</Internal Changes>.
+
+=head1 Performance Enhancements
+
+=over 4
+
+=item *
+
+Fix a slowdown in freeing nested hashes. This may speedup the exit of 
+certain programs.
+
+=back
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+C<attributes> has been upgraded from version 0.17 to 0.18.
+
+=item *
+
+C<charnames> has been upgraded from version 1.29 to 1.30.
+
+=item *
+
+C<feature> has been upgraded from version 1.26 to 1.27.
+
+C<no feature;> now means reset to default. The code has been refactored
+to reduce duplication.
+
+=item *
+
+C<B::Deparse> has been upgraded from version 1.12 to 1.13.
+
+=item *
+
+C<B::Lint> has been upgraded from version 1.13 to 1.14.
+
+=item *
+
+C<CPAN::Meta> has been upgraded from version 2.120351 to 2.120630.
+
+=item *
+
+C<CPANPLUS> has been upgraded from version 0.9118 to 0.9121.
+
+=item *
+
+C<Data::Dumper> has been upgraded from version 2.135_05 to 2.135_06.
+
+=item *
+
+C<Digest::SHA> has been upgraded from version 5.70 to 5.71.
+
+=item *
+
+C<ExtUtils::CBuilder> has been upgraded from version 0.280205 to 0.280206.
+
+=item *
+
+C<HTTP::Tiny> has been upgraded from version 0.016 to 0.017.
+
+=item *
+
+C<Module::CoreList> has been upgraded from version 2.60 to 2.65.
+
+=item *
+
+C<Pod::Html> has been upgraded from version 1.14 to 1.1501.
+
+=item *
+
+C<Pod::Perldoc> has been upgraded from version 3.15_15 to 3.17.
+
+=item *
+
+C<Pod::Simple> has been upgraded from version 3.19 to 3.20.
+
+=item *
+
+C<Socket> has been upgraded from version 1.98 to 2.000.
+
+=item *
+
+C<Term::ReadLine> has been upgraded from version 1.08 to 1.09.
+
+C<< Term::ReadLine >> now optionally integrates with event loops
+other than C<< Tk >>.
+
+=item *
+
+C<Unicode::Collate> has been upgraded from version 0.87 to 0.89.
+
+=item *
+
+C<Unicode::Normalize> has been upgraded from version 1.13 to 1.14.
+
+=item *
+
+C<Unicode::UCD> has been upgraded from version 0.41 to 0.42.
+
+=item *
+
+C<XS::APItest> has been upgraded from version 0.36 to 0.37.
+
+=back
+
+
+=head1 Documentation
+
+There has been no significant change in the documentation between 
+5.15.8 and 5.15.9.
+
+=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>.
+
+=head2 New Diagnostics
+
+=head3 New Errors
+
+Compared to 5.15.8, 5.15.9 does not introduce new errors.
+
+=head3 New Warnings
+
+Compared to 5.15.8, 5.15.9 does not introduce new warnings, but see
+L</Changes to Existing Diagnostics>
+
+=head2 Changes to Existing Diagnostics
+
+=over 4
+
+=item *
+
+L<lvalue attribute %s already-defined subroutine|perldiag/"lvalue attribute %s already-defined subroutine">, which replaces
+C<< lvalue attribute cannot be removed after the subroutine has been defined >>.
+
+=back
+
+=head1 Utility Changes
+
+No utilities changed between 5.15.8 and 5.15.9.
+
+=head1 Configuration and Compilation
+
+=over 4
+
+=item *
+
+C<< perlfunc.html >> is now being generated again. [perl #107870]
+
+=back
+
+=head1 Testing
+
+=over 4
+
+=item *
+
+F<< t/op/require_37033.t >> has been added, to test that C<require>
+always closes the file handle that it opens. Previously, it had been
+leaking the file handle if it happened to have file descriptor 0, which
+would happen if C<require> was called (explicitly or implicitly) when
+C<STDIN> had been closed.
+
+=back
+
+=head1 Platform Support
+
+There have been no changes to Perl's support of various platforms between
+5.15.8 and 5.15.9.
+
+=head1 Internal Changes
+
+=over 4
+
+=item *
+
+Two new functions C<utf8_to_uvchr_buf()> and C<utf8_to_uvuni_buf()> have
+been added.  These are the same as C<utf8_to_uvchr> and
+C<utf8_to_uvuni> (which are now deprecated), but take an extra parameter
+that is used to guard against reading beyond the end of the input
+string.
+See L<perlapi/utf8_to_uvchr_buf> and L<perlapi/utf8_to_uvuni_buf>.
+
+=item *
+
+The regular expression engine now does TRIE case insensitive matches
+under Unicode. This may change the output of C<< use re 'debug'; >>,
+and will speed up various things.
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+I<Takri> now matches two more characters under the C<Script_Extensions>
+property. This corrects a Unicode 6.1 omission.
+
+=item *
+
+C<< perlfunc.html >> is now being generated again. [perl #107870]
+
+=item *
+
+C<< $$ >> is no longer tainted. Since this value comes directly from
+C<< getpid() >>, it is always safe.
+
+=item *
+
+Fix leaking a file handle. [perl #37033]
+
+=item *
+
+An off-by-one error caused C<< /[:upper:]/ >> and C<< /[:punct:]/ >> to
+unexpectedly match characters with code points above 255. This has been
+rectified. [perl 111400].
+
+=item *
+
+C<< (?foo: ...) >> no longer loses passed in character set.
+
+=item *
+
+Allow attributes to set C<< :lvalue >> on a defined sub. [perl 107366].
+
+=item *
+
+C<< die; >> with a non-reference, non-string value in $@ now properly
+propagates that value [perl #111654].
+
+=back
+
+=head1 Known Problems
+
+This is a list of some significant unfixed bugs, which need to be
+resolved before 5.16.0
+
+=over 4
+
+=item F<< op/sigdispatch.t >> fails alarm test 14 and gets killed [perl #89718]
+
+E<32>
+
+=item Perl crash due to wrong delimiter in C<< PATH >> environment [perl #94846]
+
+It's possible to crash perl under Win32 if the wrong delimiter is used.
+
+=item Corrupt UTF8 [perl #79960, #100058]
+
+It is possible to read an invalid UTF8 character, but have it marked valid,
+or to incorrectly read UTF8 characters if C<< $/ >> is set to read fixed
+length records.
+
+=item UTF8 patches for 5.16 [perl #107008]
+
+Brian Fraser's work on UTF8 needs further integration.
+
+=item C<eval { 'fork()' }> is broken on Windows [perl #109718]
+
+This is a known test failure to be fixed before 5.16.0. 
+
+=item Warnings from cpan/IO-Compress [perl #110736]
+
+Some tests in F<< cpan/IO-Compress/t/cz-03zlib-v1.t >> issues a 
+"isn't numeric" warning in blead, but not in maint.
+
+=item C<< Pod-Html >> test failures on Windows.
+
+A number of tests for C<< Pod::Html >> fail under Windows, due to an 
+incorrect assumption by the test scripts about capitalization of the
+network drive.
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.15.9 represents approximately 4 weeks of development since Perl 5.15.8
+and contains approximately 79,000 lines of changes across 530 files from 23
+authors.
+
+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 5.15.9:
+
+Aaron Crane, Abigail, Chris 'BinGOs' Williams, Craig A. Berry, Dave Rolsky,
+David Cantrell, David Golden, David Mitchell, Eric Brine, Father Chrysostomos,
+Florian Ragwitz, James E Keenan, Jesse Vincent, Karl Williamson, Marc Green,
+Max Maischein, Nicholas Clark, Pau Amma, Reini Urban, Ricardo Signes, Tony
+Cook, Yves Orton, Zefram.
+
+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.
+
+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.
+
+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
+
+If you find what you think is a bug, you might check the articles
+recently posted to the comp.lang.perl.misc newsgroup and the perl
+bug database at http://rt.perl.org/perlbug/ .  There may also be
+information at http://www.perl.org/ , the Perl Home Page.
+
+If you believe you have an unreported bug, please run the L<perlbug>
+program included with your release.  Be sure to trim your bug down
+to a tiny but sufficient test case.  Your bug report, along with the
+output of C<perl -V>, will be sent off to perlbug@perl.org to be
+analysed by the Perl porting team.
+
+If the bug you are reporting has security implications, which make it
+inappropriate to send to a publicly archived mailing list, then please send
+it to perl5-security-report@perl.org. This points to a closed subscription
+unarchived mailing list, which includes
+all the core committers, who will be able
+to help assess the impact of issues, figure out a resolution, and help
+co-ordinate the release of patches to mitigate or fix the problem across all
+platforms on which Perl is supported. Please only use this address for
+security issues in the Perl core, not for modules independently
+distributed on CPAN.
+
+=head1 SEE ALSO
+
+The F<Changes> file for an explanation of how to view exhaustive details
+on what changed.
+
+The F<INSTALL> file for how to build Perl.
+
+The F<README> file for general stuff.
+
+The F<Artistic> and F<Copying> files for copyright information.
+
+=cut
diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 5ffd9125a6..e3a9cbf1b2 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -2,367 +2,361 @@
 
 =head1 NAME
 
-perldelta - what is new for perl v5.15.9
+[ this is a template for a new perldelta file. Any text flagged as
+XXX needs to be processed before release. ]
+
+perldelta - what is new for perl v5.15.10
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.15.8 release and
-the 5.15.9 release.
+This document describes differences between the 5.15.9 release and
+the 5.15.10 release.
 
-If you are upgrading from an earlier release such as 5.15.7, first read
-L<perl5158delta>, which describes differences between 5.15.7 and
-5.15.8.
+If you are upgrading from an earlier release such as 5.15.8, first read
+L<perl5159delta>, which describes differences between 5.15.8 and
+5.15.9.
 
 =head1 Notice
 
-This space intentionally left blank.
+XXX Any important notices here
 
 =head1 Core Enhancements
 
-=head2 C<< no feature; >> now means reset to default
+XXX New core language features go here. Summarise user-visible core language
+enhancements. Particularly prominent performance optimisations could go
+here, but most should go in the L</Performance Enhancements> section.
 
-C<< no feature >> now resets to the default feature set.  To disable all
-features (which is likely to be a pretty special-purpose request, since
-it presumably won't match any named set of semantics) you can now  
-write C<< no feature ':all' >>.
+[ List each enhancement as a =head2 entry ]
 
 =head1 Security
 
-=head2 Malformed UTF-8 input could cause attempts to read beyond the end of the buffer
+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.
 
-Two new XS-accessible functions, C<utf8_to_uvchr_buf()> and
-C<utf8_to_uvuni_buf()> are now available to prevent this, and the Perl
-core has been converted to use them.
-See L</Internal Changes>.
+[ List each security issue as a =head2 entry ]
 
 =head1 Incompatible Changes
 
-=head2 C<< no feature; >>
+XXX For a release on a stable branch, this section aspires to be:
+
+    There are no changes intentionally incompatible with 5.XXX.XXX
+    If any exist, they are bugs, and we request that you submit a
+    report.  See L</Reporting Bugs> below.
 
-C<no feature;> now means reset to default.
+[ List each incompatible change as a =head2 entry ]
 
 =head1 Deprecations
 
-=head2 Literal C<< "{" >> characters in regular expressions.
+XXX Any deprecated features, syntax, modules etc. should be listed here.
+In particular, deprecated modules should be listed here even if they are
+listed as an updated module in the L</Modules and Pragmata> section.
 
-It has been documented that the current plans include requiring a
-literal C<< "{" >> to be escaped: 5.18 will emit deprecation warnings,
-and it will be required in 5.20.
+[ List each deprecation as a =head2 entry ]
 
-=head2 XS functions C<utf8_to_uvchr()> and C<utf8_to_uvuni()>
+=head1 Performance Enhancements
 
-Use C<utf8_to_uvchr_buf()> and C<utf8_to_uvuni_buf()> instead.
-See L</Internal Changes>.
+XXX Changes which enhance performance without changing behaviour go here. There
+may well be none in a stable release.
 
-=head1 Performance Enhancements
+[ List each enhancement as a =item entry ]
 
 =over 4
 
 =item *
 
-Fix a slowdown in freeing nested hashes. This may speedup the exit of 
-certain programs.
+XXX
 
 =back
 
 =head1 Modules and Pragmata
 
-=head2 Updated Modules and Pragmata
+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>, which prints stub
+entries to STDOUT.  Results can be pasted in place of the '=head2' entries
+below.  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.
 
-=over 4
+[ Within each section, list entries as a =item entry ]
 
-=item *
+=head2 New Modules and Pragmata
 
-C<attributes> has been upgraded from version 0.17 to 0.18.
+=over 4
 
 =item *
 
-C<charnames> has been upgraded from version 1.29 to 1.30.
+XXX
 
-=item *
+=back
 
-C<feature> has been upgraded from version 1.26 to 1.27.
+=head2 Updated Modules and Pragmata
 
-C<no feature;> now means reset to default. The code has been refactored
-to reduce duplication.
+=over 4
 
 =item *
 
-C<B::Deparse> has been upgraded from version 1.12 to 1.13.
+L<XXX> has been upgraded from version 0.69 to version 0.70.
 
-=item *
-
-C<B::Lint> has been upgraded from version 1.13 to 1.14.
+=back
 
-=item *
+=head2 Removed Modules and Pragmata
 
-C<CPAN::Meta> has been upgraded from version 2.120351 to 2.120630.
+=over 4
 
 =item *
 
-C<CPANPLUS> has been upgraded from version 0.9118 to 0.9121.
+XXX
 
-=item *
+=back
 
-C<Data::Dumper> has been upgraded from version 2.135_05 to 2.135_06.
+=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>.
 
-C<Digest::SHA> has been upgraded from version 5.70 to 5.71.
+=head2 New Documentation
 
-=item *
+XXX Changes which create B<new> files in F<pod/> go here.
 
-C<ExtUtils::CBuilder> has been upgraded from version 0.280205 to 0.280206.
+=head3 L<XXX>
 
-=item *
+XXX Description of the purpose of the new file here
 
-C<HTTP::Tiny> has been upgraded from version 0.016 to 0.017.
+=head2 Changes to Existing Documentation
 
-=item *
+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.
+
+=head3 L<XXX>
 
-C<Module::CoreList> has been upgraded from version 2.60 to 2.65.
+=over 4
 
 =item *
 
-C<Pod::Html> has been upgraded from version 1.14 to 1.1501.
+XXX Description of the change here
 
-=item *
+=back
 
-C<Pod::Perldoc> has been upgraded from version 3.15_15 to 3.17.
+=head1 Diagnostics
 
-=item *
+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>.
 
-C<Pod::Simple> has been upgraded from version 3.19 to 3.20.
+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.
 
-=item *
+[ Within each section, list entries as a =item entry that links to perldiag,
+  e.g.
 
-C<Socket> has been upgraded from version 1.98 to 2.000.
+  =item *
 
-=item *
+  L<Invalid version object|perldiag/"Invalid version object">
+]
 
-C<Term::ReadLine> has been upgraded from version 1.08 to 1.09.
+=head2 New Diagnostics
 
-C<< Term::ReadLine >> now optionally integrates with event loops
-other than C<< Tk >>.
+XXX Newly added diagnostic messages go here
 
-=item *
+=head3 New Errors
 
-C<Unicode::Collate> has been upgraded from version 0.87 to 0.89.
+=over 4
 
 =item *
 
-C<Unicode::Normalize> has been upgraded from version 1.13 to 1.14.
+XXX L<message|perldiag/"message">
 
-=item *
+=back
 
-C<Unicode::UCD> has been upgraded from version 0.41 to 0.42.
+=head3 New Warnings
+
+=over 4
 
 =item *
 
-C<XS::APItest> has been upgraded from version 0.36 to 0.37.
+XXX L<message|perldiag/"message">
 
 =back
 
+=head2 Changes to Existing Diagnostics
 
-=head1 Documentation
-
-There has been no significant change in the documentation between 
-5.15.8 and 5.15.9.
+XXX Changes (i.e. rewording) of diagnostic messages go here
 
-=head1 Diagnostics
+=over 4
 
-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>.
+=item *
 
-=head2 New Diagnostics
+XXX Describe change here
 
-=head3 New Errors
+=back
 
-Compared to 5.15.8, 5.15.9 does not introduce new errors.
+=head1 Utility Changes
 
-=head3 New Warnings
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
+here. Most of these are built within the directories F<utils> and F<x2p>.
 
-Compared to 5.15.8, 5.15.9 does not introduce new warnings, but see
-L</Changes to Existing Diagnostics>
+[ List utility changes as a =head3 entry for each utility and =item
+entries for each change
+Use L<XXX> with program names to get proper documentation linking. ]
 
-=head2 Changes to Existing Diagnostics
+=head3 L<XXX>
 
 =over 4
 
 =item *
 
-L<lvalue attribute %s already-defined subroutine|perldiag/"lvalue attribute %s already-defined subroutine">, which replaces
-C<< lvalue attribute cannot be removed after the subroutine has been defined >>.
+XXX
 
 =back
 
-=head1 Utility Changes
+=head1 Configuration and Compilation
 
-No utilities changed between 5.15.8 and 5.15.9.
+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.
 
-=head1 Configuration and Compilation
+[ List changes as a =item entry ].
 
 =over 4
 
 =item *
 
-C<< perlfunc.html >> is now being generated again. [perl #107870]
+XXX
 
 =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 summarising, although the bugs
+that they represent may be covered elsewhere.
+
+[ List each test improvement as a =item entry ]
+
 =over 4
 
 =item *
 
-F<< t/op/require_37033.t >> has been added, to test that C<require>
-always closes the file handle that it opens. Previously, it had been
-leaking the file handle if it happened to have file descriptor 0, which
-would happen if C<require> was called (explicitly or implicitly) when
-C<STDIN> had been closed.
+XXX
 
 =back
 
 =head1 Platform Support
 
-There have been no changes to Perl's support of various platforms between
-5.15.8 and 5.15.9.
+XXX Any changes to platform support should be listed in the sections below.
 
-=head1 Internal Changes
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
 
-=over 4
+=head2 New Platforms
 
-=item *
+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.
 
-Two new functions C<utf8_to_uvchr_buf()> and C<utf8_to_uvuni_buf()> have
-been added.  These are the same as C<utf8_to_uvchr> and
-C<utf8_to_uvuni> (which are now deprecated), but take an extra parameter
-that is used to guard against reading beyond the end of the input
-string.
-See L<perlapi/utf8_to_uvchr_buf> and L<perlapi/utf8_to_uvuni_buf>.
+=over 4
 
-=item *
+=item XXX-some-platform
 
-The regular expression engine now does TRIE case insensitive matches
-under Unicode. This may change the output of C<< use re 'debug'; >>,
-and will speed up various things.
+XXX
 
 =back
 
-=head1 Selected Bug Fixes
+=head2 Discontinued Platforms
 
-=over 4
+XXX List any platforms that this version of perl no longer compiles on.
 
-=item *
+=over 4
 
-I<Takri> now matches two more characters under the C<Script_Extensions>
-property. This corrects a Unicode 6.1 omission.
+=item XXX-some-platform
 
-=item *
+XXX
 
-C<< perlfunc.html >> is now being generated again. [perl #107870]
+=back
 
-=item *
+=head2 Platform-Specific Notes
 
-C<< $$ >> is no longer tainted. Since this value comes directly from
-C<< getpid() >>, it is always safe.
+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.
 
-=item *
+=over 4
 
-Fix leaking a file handle. [perl #37033]
+=item XXX-some-platform
 
-=item *
+XXX
 
-An off-by-one error caused C<< /[:upper:]/ >> and C<< /[:punct:]/ >> to
-unexpectedly match characters with code points above 255. This has been
-rectified. [perl 111400].
+=back
 
-=item *
+=head1 Internal Changes
 
-C<< (?foo: ...) >> no longer loses passed in character set.
+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.
 
-=item *
+[ List each change as a =item entry ]
 
-Allow attributes to set C<< :lvalue >> on a defined sub. [perl 107366].
+=over 4
 
 =item *
 
-C<< die; >> with a non-reference, non-string value in $@ now properly
-propagates that value [perl #111654].
+XXX
 
 =back
 
-=head1 Known Problems
-
-This is a list of some significant unfixed bugs, which need to be
-resolved before 5.16.0
-
-=over 4
-
-=item F<< op/sigdispatch.t >> fails alarm test 14 and gets killed [perl #89718]
+=head1 Selected Bug Fixes
 
-E<32>
+XXX Important bug fixes in the core language are summarised here.
+Bug fixes in files in F<ext/> and F<lib/> are best summarised in
+L</Modules and Pragmata>.
 
-=item Perl crash due to wrong delimiter in C<< PATH >> environment [perl #94846]
+[ List each fix as a =item entry ]
 
-It's possible to crash perl under Win32 if the wrong delimiter is used.
+=over 4
 
-=item Corrupt UTF8 [perl #79960, #100058]
+=item *
 
-It is possible to read an invalid UTF8 character, but have it marked valid,
-or to incorrectly read UTF8 characters if C<< $/ >> is set to read fixed
-length records.
+XXX
 
-=item UTF8 patches for 5.16 [perl #107008]
+=back
 
-Brian Fraser's work on UTF8 needs further integration.
+=head1 Known Problems
 
-=item C<eval { 'fork()' }> is broken on Windows [perl #109718]
+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, unless
+they were specific to a particular platform (see below).
 
-This is a known test failure to be fixed before 5.16.0. 
+This is a list of some significant unfixed bugs, which are regressions
+from either 5.XXX.XXX or 5.XXX.XXX.
 
-=item Warnings from cpan/IO-Compress [perl #110736]
+[ List each fix as a =item entry ]
 
-Some tests in F<< cpan/IO-Compress/t/cz-03zlib-v1.t >> issues a 
-"isn't numeric" warning in blead, but not in maint.
+=over 4
 
-=item C<< Pod-Html >> test failures on Windows.
+=item *
 
-A number of tests for C<< Pod::Html >> fail under Windows, due to an 
-incorrect assumption by the test scripts about capitalization of the
-network drive.
+XXX
 
 =back
 
-=head1 Acknowledgements
-
-Perl 5.15.9 represents approximately 4 weeks of development since Perl 5.15.8
-and contains approximately 79,000 lines of changes across 530 files from 23
-authors.
-
-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 5.15.9:
+=head1 Obituary
 
-Aaron Crane, Abigail, Chris 'BinGOs' Williams, Craig A. Berry, Dave Rolsky,
-David Cantrell, David Golden, David Mitchell, Eric Brine, Father Chrysostomos,
-Florian Ragwitz, James E Keenan, Jesse Vincent, Karl Williamson, Marc Green,
-Max Maischein, Nicholas Clark, Pau Amma, Reini Urban, Ricardo Signes, Tony
-Cook, Yves Orton, Zefram.
+XXX If any significant core contributor has died, we've added a short obituary
+here.
 
-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.
+=head1 Acknowledgements
 
-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.
+XXX Generate this with:
 
-For a more complete list of all of Perl's historical contributors, please see
-the F<AUTHORS> file in the Perl source distribution.
+  perl Porting/acknowledgements.pl v5.15.9..HEAD
 
 =head1 Reporting Bugs
 
diff --git a/vms/descrip_mms.template b/vms/descrip_mms.template
index 72d85535bc..7f0427b078 100644
--- a/vms/descrip_mms.template
+++ b/vms/descrip_mms.template
@@ -345,7 +345,7 @@ x2p : [.x2p]$(DBG)a2p$(E) [.x2p]s2p.com [.x2p]find2perl.com
 extra.pods : miniperl
 	@ @extra_pods.com
 
-PERLDELTA_CURRENT = [.pod]perl5159delta.pod
+PERLDELTA_CURRENT = [.pod]perl51510delta.pod
 
 $(PERLDELTA_CURRENT) : [.pod]perldelta.pod
 	Copy/NoConfirm/Log $(MMS$SOURCE) $(MMS$TARGET)
diff --git a/win32/Makefile b/win32/Makefile
index 226a17f090..d5685428ef 100644
--- a/win32/Makefile
+++ b/win32/Makefile
@@ -1075,7 +1075,7 @@ utils: $(PERLEXE) $(X2P)
 	copy ..\README.vmesa    ..\pod\perlvmesa.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5159delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl51510delta.pod
 	cd ..\win32
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(PERLEXE) $(ICWD) ..\autodoc.pl ..
@@ -1168,7 +1168,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5159delta.pod perlaix.pod perlamiga.pod perlapi.pod \
+	    perl51510delta.pod perlaix.pod perlamiga.pod perlapi.pod \
 	    perlbeos.pod perlbs2000.pod perlce.pod perlcn.pod \
 	    perlcygwin.pod perldgux.pod perldos.pod perlepoc.pod \
 	    perlfreebsd.pod perlhaiku.pod perlhpux.pod perlhurd.pod \
diff --git a/win32/makefile.mk b/win32/makefile.mk
index d69982aba3..b3aca56628 100644
--- a/win32/makefile.mk
+++ b/win32/makefile.mk
@@ -1261,7 +1261,7 @@ utils: $(PERLEXE) $(X2P)
 	copy ..\README.vmesa    ..\pod\perlvmesa.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5159delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl51510delta.pod
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(PERLEXE) $(ICWD) ..\autodoc.pl ..
 	$(PERLEXE) $(ICWD) ..\pod\perlmodlib.pl -q
@@ -1353,7 +1353,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5159delta.pod perlaix.pod perlamiga.pod perlapi.pod \
+	    perl51510delta.pod perlaix.pod perlamiga.pod perlapi.pod \
 	    perlbeos.pod perlbs2000.pod perlce.pod perlcn.pod \
 	    perlcygwin.pod perldgux.pod perldos.pod perlepoc.pod \
 	    perlfreebsd.pod perlhaiku.pod perlhpux.pod perlhurd.pod \
diff --git a/win32/pod.mak b/win32/pod.mak
index 37b5e09b61..4ef661bcd4 100644
--- a/win32/pod.mak
+++ b/win32/pod.mak
@@ -27,6 +27,7 @@ POD = perl.pod	\
 	perl5141delta.pod	\
 	perl5142delta.pod	\
 	perl5150delta.pod	\
+	perl51510delta.pod	\
 	perl5151delta.pod	\
 	perl5152delta.pod	\
 	perl5153delta.pod	\
@@ -154,6 +155,7 @@ MAN = perl.man	\
 	perl5141delta.man	\
 	perl5142delta.man	\
 	perl5150delta.man	\
+	perl51510delta.man	\
 	perl5151delta.man	\
 	perl5152delta.man	\
 	perl5153delta.man	\
@@ -281,6 +283,7 @@ HTML = perl.html	\
 	perl5141delta.html	\
 	perl5142delta.html	\
 	perl5150delta.html	\
+	perl51510delta.html	\
 	perl5151delta.html	\
 	perl5152delta.html	\
 	perl5153delta.html	\
@@ -408,6 +411,7 @@ TEX = perl.tex	\
 	perl5141delta.tex	\
 	perl5142delta.tex	\
 	perl5150delta.tex	\
+	perl51510delta.tex	\
 	perl5151delta.tex	\
 	perl5152delta.tex	\
 	perl5153delta.tex	\