Create new perldelta for 5.20.3

10 files changed, 639 insertions, 217 deletions

diff --git a/MANIFEST b/MANIFEST
index 689685447c..d4369fc030 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -4602,6 +4602,7 @@ pod/perl5182delta.pod		Perl changes in version 5.18.2
 pod/perl5184delta.pod		Perl changes in version 5.18.4
 pod/perl5200delta.pod		Perl changes in version 5.20.0
 pod/perl5201delta.pod		Perl changes in version 5.20.1
+pod/perl5202delta.pod		Perl changes in version 5.20.2
 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 a2e6034037..ee2517dbc5 100755
--- a/Makefile.SH
+++ b/Makefile.SH
@@ -491,7 +491,7 @@ mini_obj = $(minindt_obj) $(MINIDTRACE_O)
 ndt_obj = $(obj0) $(obj1) $(obj2) $(obj3) $(ARCHOBJS)
 obj = $(ndt_obj) $(DTRACE_O)
 
-perltoc_pod_prereqs = extra.pods pod/perl5202delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
+perltoc_pod_prereqs = extra.pods pod/perl5203delta.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
 
@@ -1016,9 +1016,9 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc
 pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST
 	$(MINIPERL) pod/perlmodlib.PL -q
 
-pod/perl5202delta.pod: pod/perldelta.pod
-	$(RMS) pod/perl5202delta.pod
-	$(LNS) perldelta.pod pod/perl5202delta.pod
+pod/perl5203delta.pod: pod/perldelta.pod
+	$(RMS) pod/perl5203delta.pod
+	$(LNS) perldelta.pod pod/perl5203delta.pod
 
 extra.pods: $(MINIPERL_EXE)
 	-@test ! -f extra.pods || rm -f `cat extra.pods`
diff --git a/pod/.gitignore b/pod/.gitignore
index 38984941d9..3e14c5ba8d 100644
--- a/pod/.gitignore
+++ b/pod/.gitignore
@@ -59,7 +59,7 @@
 /roffitall
 
 # generated
-/perl5202delta.pod
+/perl5203delta.pod
 /perlapi.pod
 /perlintern.pod
 *.html
diff --git a/pod/perl.pod b/pod/perl.pod
index 9473daffa1..5155344812 100644
--- a/pod/perl.pod
+++ b/pod/perl.pod
@@ -180,6 +180,7 @@ aux a2p c2ph h2ph h2xs perlbug pl2pm pod2html pod2man s2p splain xsubpp
 
     perlhist		Perl history records
     perldelta		Perl changes since previous version
+    perl5202delta	Perl changes in version 5.20.2
     perl5201delta	Perl changes in version 5.20.1
     perl5200delta	Perl changes in version 5.20.0
     perl5184delta	Perl changes in version 5.18.4
diff --git a/pod/perl5202delta.pod b/pod/perl5202delta.pod
new file mode 100644
index 0000000000..98707fde03
--- /dev/null
+++ b/pod/perl5202delta.pod
@@ -0,0 +1,415 @@
+=encoding utf8
+
+=head1 NAME
+
+perl5202delta - what is new for perl v5.20.2
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.20.1 release and the 5.20.2
+release.
+
+If you are upgrading from an earlier release such as 5.20.0, first read
+L<perl5201delta>, which describes differences between 5.20.0 and 5.20.1.
+
+=head1 Incompatible Changes
+
+There are no changes intentionally incompatible with 5.20.1.  If any exist,
+they are bugs, and we request that you submit a report.  See L</Reporting Bugs>
+below.
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+L<attributes> has been upgraded from version 0.22 to 0.23.
+
+The usage of C<memEQs> in the XS has been corrected.
+L<[perl #122701]|https://rt.perl.org/Ticket/Display.html?id=122701>
+
+=item *
+
+L<Data::Dumper> has been upgraded from version 2.151 to 2.151_01.
+
+Fixes CVE-2014-4330 by adding a configuration variable/option to limit
+recursion when dumping deep data structures.
+
+=item *
+
+L<Errno> has been upgraded from version 1.20_03 to 1.20_05.
+
+Warnings when building the XS on Windows with the Visual C++ compiler are now
+avoided.
+
+=item *
+
+L<feature> has been upgraded from version 1.36 to 1.36_01.
+
+The C<postderef> feature has now been documented.  This feature was actually
+added in Perl 5.20.0 but was accidentally omitted from the feature
+documentation until now.
+
+=item *
+
+L<IO::Socket> has been upgraded from version 1.37 to 1.38.
+
+Document the limitations of the connected() method.
+L<[perl #123096]|https://rt.perl.org/Ticket/Display.html?id=123096>
+
+=item *
+
+L<Module::CoreList> has been upgraded from version 5.020001 to 5.20150214.
+
+The list of Perl versions covered has been updated.
+
+=item *
+
+PathTools has been upgraded from version 3.48 to 3.48_01.
+
+A warning from the B<gcc> compiler is now avoided when building the XS.
+
+=item *
+
+L<PerlIO::scalar> has been upgraded from version 0.18 to 0.18_01.
+
+Reading from a position well past the end of the scalar now correctly returns
+end of file.
+L<[perl #123443]|https://rt.perl.org/Ticket/Display.html?id=123443>
+
+Seeking to a negative position still fails, but no longer leaves the file
+position set to a negation location.
+
+C<eof()> on a C<PerlIO::scalar> handle now properly returns true when the file
+position is past the 2GB mark on 32-bit systems.
+
+=item *
+
+L<Storable> has been upgraded from version 2.49 to 2.49_01.
+
+Minor grammatical change to the documentation only.
+
+=item *
+
+L<VMS::DCLsym> has been upgraded from version 1.05 to 1.05_01.
+
+Minor formatting change to the documentation only.
+
+=item *
+
+L<VMS::Stdio> has been upgraded from version 2.4 to 2.41.
+
+Minor formatting change to the documentation only.
+
+=back
+
+=head1 Documentation
+
+=head2 New Documentation
+
+=head3 L<perlunicook>
+
+This document, by Tom Christiansen, provides examples of handling Unicode in
+Perl.
+
+=head2 Changes to Existing Documentation
+
+=head3 L<perlexperiment>
+
+=over 4
+
+=item *
+
+Added reference to subroutine signatures.  This feature was actually added in
+Perl 5.20.0 but was accidentally omitted from the experimental feature
+documentation until now.
+
+=back
+
+=head3 L<perlpolicy>
+
+=over 4
+
+=item *
+
+The process whereby features may graduate from experimental status has now been
+formally documented.
+
+=back
+
+=head3 L<perlsyn>
+
+=over 4
+
+=item *
+
+An ambiguity in the documentation of the ellipsis statement has been corrected.
+L<[perl #122661]|https://rt.perl.org/Ticket/Display.html?id=122661>
+
+=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>.
+
+=head2 Changes to Existing Diagnostics
+
+=over 4
+
+=item *
+
+L<Bad symbol for scalar|perldiag/"Bad symbol for scalar"> is now documented.
+This error is not new, but was not previously documented here.
+
+=item *
+
+L<Missing right brace on \N{}|perldiag/"Missing right brace on \N{}"> is now
+documented.  This error is not new, but was not previously documented here.
+
+=back
+
+=head1 Testing
+
+=over 4
+
+=item *
+
+The test script F<re/rt122747.t> has been added to verify that
+L<perl #122747|https://rt.perl.org/Ticket/Display.html?id=122747> remains
+fixed.
+
+=back
+
+=head1 Platform Support
+
+=head2 Regained Platforms
+
+IRIX and Tru64 platforms are working again.  (Some C<make test> failures
+remain.)
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+AIX now sets the length in C<< getsockopt >> correctly.
+L<[perl #120835]|https://rt.perl.org/Ticket/Display.html?id=120835>,
+L<[cpan #91183]|https://rt.cpan.org/Ticket/Display.html?id=91183>,
+L<[cpan #85570]|https://rt.cpan.org/Ticket/Display.html?id=85570>
+
+=item *
+
+In Perl 5.20.0, C<$^N> accidentally had the internal UTF8 flag turned off if
+accessed from a code block within a regular expression, effectively
+UTF8-encoding the value.  This has been fixed.
+L<[perl #123135]|https://rt.perl.org/Ticket/Display.html?id=123135>
+
+=item *
+
+Various cases where the name of a sub is used (autoload, overloading, error
+messages) used to crash for lexical subs, but have been fixed.
+
+=item *
+
+An assertion failure when parsing C<sort> with debugging enabled has been
+fixed.
+L<[perl #122771]|https://rt.perl.org/Ticket/Display.html?id=122771>
+
+=item *
+
+Loading UTF8 tables during a regular expression match could cause assertion
+failures under debugging builds if the previous match used the very same
+regular expression.
+L<[perl #122747]|https://rt.perl.org/Ticket/Display.html?id=122747>
+
+=item *
+
+Due to a mistake in the string-copying logic, copying the value of a state
+variable could instead steal the value and undefine the variable.  This bug,
+introduced in Perl 5.20, would happen mostly for long strings (1250 chars or
+more), but could happen for any strings under builds with copy-on-write
+disabled.
+L<[perl #123029]|https://rt.perl.org/Ticket/Display.html?id=123029>
+
+=item *
+
+Fixed a bug that could cause perl to execute an infinite loop during
+compilation.
+L<[perl #122995]|https://rt.perl.org/Ticket/Display.html?id=122995>
+
+=item *
+
+On Win32, restoring in a child pseudo-process a variable that was C<local()>ed
+in a parent pseudo-process before the C<fork> happened caused memory corruption
+and a crash in the child pseudo-process (and therefore OS process).
+L<[perl #40565]|https://rt.perl.org/Ticket/Display.html?id=40565>
+
+=item *
+
+Tainted constants evaluated at compile time no longer cause unrelated
+statements to become tainted.
+L<[perl #122669]|https://rt.perl.org/Ticket/Display.html?id=122669>
+
+=item *
+
+Calling C<write> on a format with a C<^**> field could produce a panic in
+sv_chop() if there were insufficient arguments or if the variable used to fill
+the field was empty.
+L<[perl #123245]|https://rt.perl.org/Ticket/Display.html?id=123245>
+
+=item *
+
+In Perl 5.20.0, C<sort CORE::fake> where 'fake' is anything other than a
+keyword started chopping of the last 6 characters and treating the result as a
+sort sub name.  The previous behaviour of treating "CORE::fake" as a sort sub
+name has been restored.
+L<[perl #123410]|https://rt.perl.org/Ticket/Display.html?id=123410>
+
+=item *
+
+A bug in regular expression patterns that could lead to segfaults and other
+crashes has been fixed.  This occurred only in patterns compiled with C<"/i">,
+while taking into account the current POSIX locale (this usually means they
+have to be compiled within the scope of C<S<"use locale">>), and there must be
+a string of at least 128 consecutive bytes to match.
+L<[perl #123539]|https://rt.perl.org/Ticket/Display.html?id=123539>
+
+=item *
+
+C<qr/@array(?{block})/> no longer dies with "Bizarre copy of ARRAY".
+L<[perl #123344]|https://rt.perl.org/Ticket/Display.html?id=123344>
+
+=item *
+
+C<gmtime> no longer crashes with not-a-number values.
+L<[perl #123495]|https://rt.perl.org/Ticket/Display.html?id=123495>
+
+=item *
+
+Certain syntax errors in substitutions, such as C<< s/${<>{})// >>, would
+crash, and had done so since Perl 5.10.  (In some cases the crash did not start
+happening until Perl 5.16.)  The crash has, of course, been fixed.
+L<[perl #123542]|https://rt.perl.org/Ticket/Display.html?id=123542>
+
+=item *
+
+A memory leak in some regular expressions, introduced in Perl 5.20.1, has been
+fixed.
+L<[perl #123198]|https://rt.perl.org/Ticket/Display.html?id=123198>
+
+=item *
+
+C<< formline("@...", "a"); >> would crash.  The C<FF_CHECKNL> case in
+pp_formline() didn't set the pointer used to mark the chop position, which led
+to the C<FF_MORE> case crashing with a segmentation fault.  This has been
+fixed.
+L<[perl #123538]|https://rt.perl.org/Ticket/Display.html?id=123538>
+L<[perl #123622]|https://rt.perl.org/Ticket/Display.html?id=123622>
+
+=item *
+
+A possible buffer overrun and crash when parsing a literal pattern during
+regular expression compilation has been fixed.
+L<[perl #123604]|https://rt.perl.org/Ticket/Display.html?id=123604>
+
+=back
+
+=head1 Known Problems
+
+=over 4
+
+=item *
+
+It is a known bug that lexical subroutines cannot be used as the C<SUBNAME>
+argument to C<sort>.  This will be fixed in a future version of Perl.
+
+=back
+
+=head1 Errata From Previous Releases
+
+=over 4
+
+=item *
+
+A regression has been fixed that was introduced in Perl 5.20.0 (fixed in Perl
+5.20.1 as well as here) in which a UTF-8 encoded regular expression pattern
+that contains a single ASCII lowercase letter does not match its uppercase
+counterpart.
+L<[perl #122655]|https://rt.perl.org/Ticket/Display.html?id=122655>
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.20.2 represents approximately 5 months of development since Perl 5.20.1
+and contains approximately 6,300 lines of changes across 170 files from 34
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 1,900 lines of changes to 80 .pm, .t, .c and .h files.
+
+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 5.20.2:
+
+Aaron Crane, Abigail, Andreas Voegele, Andy Dougherty, Anthony Heading,
+Aristotle Pagaltzis, Chris 'BinGOs' Williams, Craig A. Berry, Daniel Dragan,
+Doug Bell, Ed J, Father Chrysostomos, Glenn D. Golden, H.Merijn Brand, Hugo van
+der Sanden, James E Keenan, Jarkko Hietaniemi, Jim Cromie, Karen Etheridge,
+Karl Williamson, kmx, Matthew Horsfall, Max Maischein, Peter Martini, Rafael
+Garcia-Suarez, Ricardo Signes, Shlomi Fish, Slaven Rezic, Steffen Müller,
+Steve Hay, Tadeusz Sośnierz, Tony Cook, Yves Orton, Ævar Arnfjörð
+Bjarmason.
+
+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
+https://rt.perl.org/ .  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 a339f3d3bd..bc359bb54e 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -2,332 +2,359 @@
 
 =head1 NAME
 
-perldelta - what is new for perl v5.20.2
+[ 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 v5.20.3
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.20.1 release and the 5.20.2
+This document describes differences between the 5.20.2 release and the 5.20.3
 release.
 
-If you are upgrading from an earlier release such as 5.20.0, first read
-L<perl5201delta>, which describes differences between 5.20.0 and 5.20.1.
+If you are upgrading from an earlier release such as 5.20.1, first read
+L<perl5202delta>, which describes differences between 5.20.1 and 5.20.2.
 
-=head1 Incompatible Changes
+=head1 Notice
 
-There are no changes intentionally incompatible with 5.20.1.  If any exist,
-they are bugs, and we request that you submit a report.  See L</Reporting Bugs>
-below.
+XXX Any important notices here
 
-=head1 Modules and Pragmata
+=head1 Core Enhancements
 
-=head2 Updated Modules and Pragmata
+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.
 
-=over 4
+[ List each enhancement as a =head2 entry ]
 
-=item *
+=head1 Security
 
-L<attributes> has been upgraded from version 0.22 to 0.23.
+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.
 
-The usage of C<memEQs> in the XS has been corrected.
-L<[perl #122701]|https://rt.perl.org/Ticket/Display.html?id=122701>
+[ List each security issue as a =head2 entry ]
 
-=item *
+=head1 Incompatible Changes
 
-L<Data::Dumper> has been upgraded from version 2.151 to 2.151_01.
+XXX For a release on a stable branch, this section aspires to be:
 
-Fixes CVE-2014-4330 by adding a configuration variable/option to limit
-recursion when dumping deep data structures.
+    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.
 
-=item *
+[ List each incompatible change as a =head2 entry ]
 
-L<Errno> has been upgraded from version 1.20_03 to 1.20_05.
+=head1 Deprecations
 
-Warnings when building the XS on Windows with the Visual C++ compiler are now
-avoided.
+XXX Any deprecated features, syntax, modules etc. should be listed here.
 
-=item *
+=head2 Module removals
 
-L<feature> has been upgraded from version 1.36 to 1.36_01.
+XXX Remove this section if inapplicable.
 
-The C<postderef> feature has now been documented.  This feature was actually
-added in Perl 5.20.0 but was accidentally omitted from the feature
-documentation until now.
+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.
 
-=item *
+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.
 
-L<IO::Socket> has been upgraded from version 1.37 to 1.38.
+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.
 
-Document the limitations of the connected() method.
-L<[perl #123096]|https://rt.perl.org/Ticket/Display.html?id=123096>
+=over
 
-=item *
+=item XXX
+
+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<Module::CoreList> has been upgraded from version 5.020001 to 5.20150214.
+=back
 
-The list of Perl versions covered has been updated.
+[ List each other deprecation as a =head2 entry ]
 
-=item *
+=head1 Performance Enhancements
 
-PathTools has been upgraded from version 3.48 to 3.48_01.
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
 
-A warning from the B<gcc> compiler is now avoided when building the XS.
+[ List each enhancement as a =item entry ]
+
+=over 4
 
 =item *
 
-L<PerlIO::scalar> has been upgraded from version 0.18 to 0.18_01.
+XXX
 
-Reading from a position well past the end of the scalar now correctly returns
-end of file.
-L<[perl #123443]|https://rt.perl.org/Ticket/Display.html?id=123443>
+=back
 
-Seeking to a negative position still fails, but no longer leaves the file
-position set to a negation location.
+=head1 Modules and Pragmata
 
-C<eof()> on a C<PerlIO::scalar> handle now properly returns true when the file
-position is past the 2GB mark on 32-bit systems.
+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.
 
-=item *
+[ Within each section, list entries as a =item entry ]
 
-L<Storable> has been upgraded from version 2.49 to 2.49_01.
+=head2 New Modules and Pragmata
 
-Minor grammatical change to the documentation only.
+=over 4
 
 =item *
 
-L<VMS::DCLsym> has been upgraded from version 1.05 to 1.05_01.
+XXX
+
+=back
+
+=head2 Updated Modules and Pragmata
 
-Minor formatting change to the documentation only.
+=over 4
 
 =item *
 
-L<VMS::Stdio> has been upgraded from version 2.4 to 2.41.
+L<XXX> has been upgraded from version A.xx to B.yy.
 
-Minor formatting change to the documentation only.
+=back
+
+=head2 Removed Modules and Pragmata
+
+=over 4
+
+=item *
+
+XXX
 
 =back
 
 =head1 Documentation
 
+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>.
+
 =head2 New Documentation
 
-=head3 L<perlunicook>
+XXX Changes which create B<new> files in F<pod/> go here.
+
+=head3 L<XXX>
 
-This document, by Tom Christiansen, provides examples of handling Unicode in
-Perl.
+XXX Description of the purpose of the new file here
 
 =head2 Changes to Existing Documentation
 
-=head3 L<perlexperiment>
+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>
 
 =over 4
 
 =item *
 
-Added reference to subroutine signatures.  This feature was actually added in
-Perl 5.20.0 but was accidentally omitted from the experimental feature
-documentation until now.
+XXX Description of the change here
 
 =back
 
-=head3 L<perlpolicy>
+=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
 
 =item *
 
-The process whereby features may graduate from experimental status has now been
-formally documented.
+XXX L<message|perldiag/"message">
 
 =back
 
-=head3 L<perlsyn>
+=head3 New Warnings
 
 =over 4
 
 =item *
 
-An ambiguity in the documentation of the ellipsis statement has been corrected.
-L<[perl #122661]|https://rt.perl.org/Ticket/Display.html?id=122661>
+XXX L<message|perldiag/"message">
 
 =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>.
-
 =head2 Changes to Existing Diagnostics
 
+XXX Changes (i.e. rewording) of diagnostic messages go here
+
 =over 4
 
 =item *
 
-L<Bad symbol for scalar|perldiag/"Bad symbol for scalar"> is now documented.
-This error is not new, but was not previously documented here.
+XXX Describe change here
+
+=back
+
+=head1 Utility Changes
+
+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>.
+
+[ 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<XXX>
+
+=over 4
 
 =item *
 
-L<Missing right brace on \N{}|perldiag/"Missing right brace on \N{}"> is now
-documented.  This error is not new, but was not previously documented here.
+XXX
 
 =back
 
-=head1 Testing
+=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 *
 
-The test script F<re/rt122747.t> has been added to verify that
-L<perl #122747|https://rt.perl.org/Ticket/Display.html?id=122747> remains
-fixed.
+XXX
 
 =back
 
-=head1 Platform Support
-
-=head2 Regained Platforms
+=head1 Testing
 
-IRIX and Tru64 platforms are working again.  (Some C<make test> failures
-remain.)
+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.
 
-=head1 Selected Bug Fixes
+[ List each test improvement as a =item entry ]
 
 =over 4
 
 =item *
 
-AIX now sets the length in C<< getsockopt >> correctly.
-L<[perl #120835]|https://rt.perl.org/Ticket/Display.html?id=120835>,
-L<[cpan #91183]|https://rt.cpan.org/Ticket/Display.html?id=91183>,
-L<[cpan #85570]|https://rt.cpan.org/Ticket/Display.html?id=85570>
+XXX
 
-=item *
+=back
 
-In Perl 5.20.0, C<$^N> accidentally had the internal UTF8 flag turned off if
-accessed from a code block within a regular expression, effectively
-UTF8-encoding the value.  This has been fixed.
-L<[perl #123135]|https://rt.perl.org/Ticket/Display.html?id=123135>
+=head1 Platform Support
 
-=item *
+XXX Any changes to platform support should be listed in the sections below.
 
-Various cases where the name of a sub is used (autoload, overloading, error
-messages) used to crash for lexical subs, but have been fixed.
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
 
-=item *
+=head2 New Platforms
 
-An assertion failure when parsing C<sort> with debugging enabled has been
-fixed.
-L<[perl #122771]|https://rt.perl.org/Ticket/Display.html?id=122771>
+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.
 
-=item *
+=over 4
 
-Loading UTF8 tables during a regular expression match could cause assertion
-failures under debugging builds if the previous match used the very same
-regular expression.
-L<[perl #122747]|https://rt.perl.org/Ticket/Display.html?id=122747>
+=item XXX-some-platform
 
-=item *
+XXX
 
-Due to a mistake in the string-copying logic, copying the value of a state
-variable could instead steal the value and undefine the variable.  This bug,
-introduced in Perl 5.20, would happen mostly for long strings (1250 chars or
-more), but could happen for any strings under builds with copy-on-write
-disabled.
-L<[perl #123029]|https://rt.perl.org/Ticket/Display.html?id=123029>
+=back
 
-=item *
+=head2 Discontinued Platforms
 
-Fixed a bug that could cause perl to execute an infinite loop during
-compilation.
-L<[perl #122995]|https://rt.perl.org/Ticket/Display.html?id=122995>
+XXX List any platforms that this version of perl no longer compiles on.
 
-=item *
+=over 4
 
-On Win32, restoring in a child pseudo-process a variable that was C<local()>ed
-in a parent pseudo-process before the C<fork> happened caused memory corruption
-and a crash in the child pseudo-process (and therefore OS process).
-L<[perl #40565]|https://rt.perl.org/Ticket/Display.html?id=40565>
+=item XXX-some-platform
 
-=item *
+XXX
 
-Tainted constants evaluated at compile time no longer cause unrelated
-statements to become tainted.
-L<[perl #122669]|https://rt.perl.org/Ticket/Display.html?id=122669>
+=back
 
-=item *
+=head2 Platform-Specific Notes
 
-Calling C<write> on a format with a C<^**> field could produce a panic in
-sv_chop() if there were insufficient arguments or if the variable used to fill
-the field was empty.
-L<[perl #123245]|https://rt.perl.org/Ticket/Display.html?id=123245>
+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
 
-In Perl 5.20.0, C<sort CORE::fake> where 'fake' is anything other than a
-keyword started chopping of the last 6 characters and treating the result as a
-sort sub name.  The previous behaviour of treating "CORE::fake" as a sort sub
-name has been restored.
-L<[perl #123410]|https://rt.perl.org/Ticket/Display.html?id=123410>
+=item XXX-some-platform
 
-=item *
+XXX
 
-A bug in regular expression patterns that could lead to segfaults and other
-crashes has been fixed.  This occurred only in patterns compiled with C<"/i">,
-while taking into account the current POSIX locale (this usually means they
-have to be compiled within the scope of C<S<"use locale">>), and there must be
-a string of at least 128 consecutive bytes to match.
-L<[perl #123539]|https://rt.perl.org/Ticket/Display.html?id=123539>
+=back
 
-=item *
+=head1 Internal Changes
 
-C<qr/@array(?{block})/> no longer dies with "Bizarre copy of ARRAY".
-L<[perl #123344]|https://rt.perl.org/Ticket/Display.html?id=123344>
+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 ]
 
-C<gmtime> no longer crashes with not-a-number values.
-L<[perl #123495]|https://rt.perl.org/Ticket/Display.html?id=123495>
+=over 4
 
 =item *
 
-Certain syntax errors in substitutions, such as C<< s/${<>{})// >>, would
-crash, and had done so since Perl 5.10.  (In some cases the crash did not start
-happening until Perl 5.16.)  The crash has, of course, been fixed.
-L<[perl #123542]|https://rt.perl.org/Ticket/Display.html?id=123542>
+XXX
 
-=item *
+=back
 
-A memory leak in some regular expressions, introduced in Perl 5.20.1, has been
-fixed.
-L<[perl #123198]|https://rt.perl.org/Ticket/Display.html?id=123198>
+=head1 Selected Bug Fixes
 
-=item *
+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>.
 
-C<< formline("@...", "a"); >> would crash.  The C<FF_CHECKNL> case in
-pp_formline() didn't set the pointer used to mark the chop position, which led
-to the C<FF_MORE> case crashing with a segmentation fault.  This has been
-fixed.
-L<[perl #123538]|https://rt.perl.org/Ticket/Display.html?id=123538>
-L<[perl #123622]|https://rt.perl.org/Ticket/Display.html?id=123622>
+[ List each fix as a =item entry ]
+
+=over 4
 
 =item *
 
-A possible buffer overrun and crash when parsing a literal pattern during
-regular expression compilation has been fixed.
-L<[perl #123604]|https://rt.perl.org/Ticket/Display.html?id=123604>
+XXX
 
 =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 *
 
-It is a known bug that lexical subroutines cannot be used as the C<SUBNAME>
-argument to C<sort>.  This will be fixed in a future version of Perl.
+XXX
 
 =back
 
@@ -337,54 +364,28 @@ argument to C<sort>.  This will be fixed in a future version of Perl.
 
 =item *
 
-A regression has been fixed that was introduced in Perl 5.20.0 (fixed in Perl
-5.20.1 as well as here) in which a UTF-8 encoded regular expression pattern
-that contains a single ASCII lowercase letter does not match its uppercase
-counterpart.
-L<[perl #122655]|https://rt.perl.org/Ticket/Display.html?id=122655>
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
 
 =back
 
-=head1 Acknowledgements
-
-Perl 5.20.2 represents approximately 5 months of development since Perl 5.20.1
-and contains approximately 6,300 lines of changes across 170 files from 34
-authors.
+=head1 Obituary
 
-Excluding auto-generated files, documentation and release tools, there were
-approximately 1,900 lines of changes to 80 .pm, .t, .c and .h files.
+XXX If any significant core contributor has died, we've added a short obituary
+here.
 
-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 5.20.2:
-
-Aaron Crane, Abigail, Andreas Voegele, Andy Dougherty, Anthony Heading,
-Aristotle Pagaltzis, Chris 'BinGOs' Williams, Craig A. Berry, Daniel Dragan,
-Doug Bell, Ed J, Father Chrysostomos, Glenn D. Golden, H.Merijn Brand, Hugo van
-der Sanden, James E Keenan, Jarkko Hietaniemi, Jim Cromie, Karen Etheridge,
-Karl Williamson, kmx, Matthew Horsfall, Max Maischein, Peter Martini, Rafael
-Garcia-Suarez, Ricardo Signes, Shlomi Fish, Slaven Rezic, Steffen Müller,
-Steve Hay, Tadeusz Sośnierz, Tony Cook, Yves Orton, Ævar Arnfjörð
-Bjarmason.
-
-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 v5.20.2..HEAD
 
 =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
-https://rt.perl.org/ .  There may also be information at http://www.perl.org/ ,
-the Perl Home Page.
+https://rt.perl.org/ .  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
diff --git a/vms/descrip_mms.template b/vms/descrip_mms.template
index 309ffab473..992d4ac9fd 100644
--- a/vms/descrip_mms.template
+++ b/vms/descrip_mms.template
@@ -319,7 +319,7 @@ x2p : [.x2p]$(DBG)a2p$(E) [.x2p]s2p.com [.x2p]find2perl.com
 extra.pods : miniperl
 	@ @extra_pods.com
 
-PERLDELTA_CURRENT = [.pod]perl5202delta.pod
+PERLDELTA_CURRENT = [.pod]perl5203delta.pod
 
 $(PERLDELTA_CURRENT) : [.pod]perldelta.pod
 	Copy/NoConfirm/Log $(MMS$SOURCE) $(PERLDELTA_CURRENT)
diff --git a/win32/Makefile b/win32/Makefile
index aa664ced92..f77576e903 100644
--- a/win32/Makefile
+++ b/win32/Makefile
@@ -1192,7 +1192,7 @@ utils: $(PERLEXE) $(X2P) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5202delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5203delta.pod
 	cd ..\win32
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
@@ -1290,7 +1290,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5202delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5203delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/makefile.mk b/win32/makefile.mk
index 02231a1565..b20dbe8876 100644
--- a/win32/makefile.mk
+++ b/win32/makefile.mk
@@ -1391,7 +1391,7 @@ utils: $(PERLEXE) $(X2P) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5202delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5203delta.pod
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
 	$(MINIPERL) -I..\lib ..\pod\perlmodlib.PL -q ..
@@ -1488,7 +1488,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5202delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5203delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/pod.mak b/win32/pod.mak
index 1f9593a529..67ebbf40d2 100644
--- a/win32/pod.mak
+++ b/win32/pod.mak
@@ -39,6 +39,7 @@ POD = perl.pod	\
 	perl5200delta.pod	\
 	perl5201delta.pod	\
 	perl5202delta.pod	\
+	perl5203delta.pod	\
 	perl561delta.pod	\
 	perl56delta.pod	\
 	perl581delta.pod	\
@@ -172,6 +173,7 @@ MAN = perl.man	\
 	perl5200delta.man	\
 	perl5201delta.man	\
 	perl5202delta.man	\
+	perl5203delta.man	\
 	perl561delta.man	\
 	perl56delta.man	\
 	perl581delta.man	\
@@ -305,6 +307,7 @@ HTML = perl.html	\
 	perl5200delta.html	\
 	perl5201delta.html	\
 	perl5202delta.html	\
+	perl5203delta.html	\
 	perl561delta.html	\
 	perl56delta.html	\
 	perl581delta.html	\
@@ -438,6 +441,7 @@ TEX = perl.tex	\
 	perl5200delta.tex	\
 	perl5201delta.tex	\
 	perl5202delta.tex	\
+	perl5203delta.tex	\
 	perl561delta.tex	\
 	perl56delta.tex	\
 	perl581delta.tex	\