New perldelta for 5.24.4

11 files changed, 607 insertions, 190 deletions

diff --git a/MANIFEST b/MANIFEST
index 8e94b0ebfb..88b42d8b7d 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -4654,6 +4654,7 @@ pod/perl5224delta.pod		Perl changes in version 5.22.4
 pod/perl5240delta.pod		Perl changes in version 5.24.0
 pod/perl5241delta.pod		Perl changes in version 5.24.1
 pod/perl5242delta.pod		Perl changes in version 5.24.2
+pod/perl5243delta.pod		Perl changes in version 5.24.3
 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 0b9cfab280..9848d559be 100755
--- a/Makefile.SH
+++ b/Makefile.SH
@@ -522,7 +522,7 @@ miniperl_objs = $(miniperl_objs_nodt) $(DTRACE_MINI_O)
 perllib_objs  = $(perllib_objs_nodt) $(DTRACE_PERLLIB_O)
 perlmain_objs = perlmain$(OBJ_EXT) $(DTRACE_MAIN_O)
 
-perltoc_pod_prereqs = extra.pods pod/perl5243delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
+perltoc_pod_prereqs = extra.pods pod/perl5244delta.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
 
@@ -1085,9 +1085,9 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc
 pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST
 	$(MINIPERL) pod/perlmodlib.PL -q
 
-pod/perl5243delta.pod: pod/perldelta.pod
-	$(RMS) pod/perl5243delta.pod
-	$(LNS) perldelta.pod pod/perl5243delta.pod
+pod/perl5244delta.pod: pod/perldelta.pod
+	$(RMS) pod/perl5244delta.pod
+	$(LNS) perldelta.pod pod/perl5244delta.pod
 
 extra.pods: $(MINIPERL_EXE)
 	-@test ! -f extra.pods || rm -f `cat extra.pods`
diff --git a/pod/.gitignore b/pod/.gitignore
index 77f4bdf400..96544b25cd 100644
--- a/pod/.gitignore
+++ b/pod/.gitignore
@@ -53,7 +53,7 @@
 /roffitall
 
 # generated
-/perl5243delta.pod
+/perl5244delta.pod
 /perlapi.pod
 /perlintern.pod
 *.html
diff --git a/pod/perl.pod b/pod/perl.pod
index 8058f6200a..053d6845f8 100644
--- a/pod/perl.pod
+++ b/pod/perl.pod
@@ -180,6 +180,7 @@ aux c2ph h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp
 
     perlhist		Perl history records
     perldelta		Perl changes since previous version
+    perl5243delta	Perl changes in version 5.24.3
     perl5242delta	Perl changes in version 5.24.2
     perl5241delta	Perl changes in version 5.24.1
     perl5240delta	Perl changes in version 5.24.0
diff --git a/pod/perl5243delta.pod b/pod/perl5243delta.pod
new file mode 100644
index 0000000000..7aabed92b9
--- /dev/null
+++ b/pod/perl5243delta.pod
@@ -0,0 +1,335 @@
+=encoding utf8
+
+=head1 NAME
+
+perl5243delta - what is new for perl v5.24.3
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.24.2 release and the 5.24.3
+release.
+
+If you are upgrading from an earlier release such as 5.24.1, first read
+L<perl5242delta>, which describes differences between 5.24.1 and 5.24.2.
+
+=head1 Security
+
+=head2 [CVE-2017-12837] Heap buffer overflow in regular expression compiler
+
+Compiling certain regular expression patterns with the case-insensitive
+modifier could cause a heap buffer overflow and crash perl.  This has now been
+fixed.
+L<[perl #131582]|https://rt.perl.org/Public/Bug/Display.html?id=131582>
+
+=head2 [CVE-2017-12883] Buffer over-read in regular expression parser
+
+For certain types of syntax error in a regular expression pattern, the error
+message could either contain the contents of a random, possibly large, chunk of
+memory, or could crash perl.  This has now been fixed.
+L<[perl #131598]|https://rt.perl.org/Public/Bug/Display.html?id=131598>
+
+=head2 [CVE-2017-12814] C<$ENV{$key}> stack buffer overflow on Windows
+
+A possible stack buffer overflow in the C<%ENV> code on Windows has been fixed
+by removing the buffer completely since it was superfluous anyway.
+L<[perl #131665]|https://rt.perl.org/Public/Bug/Display.html?id=131665>
+
+=head1 Incompatible Changes
+
+There are no changes intentionally incompatible with 5.24.2.  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<Module::CoreList> has been upgraded from version 5.20170715_24 to
+5.20170922_24.
+
+=item *
+
+L<POSIX> has been upgraded from version 1.65 to 1.65_01.
+
+=item *
+
+L<Time::HiRes> has been upgraded from version 1.9733 to 1.9741.
+
+L<[perl #128427]|https://rt.perl.org/Public/Bug/Display.html?id=128427>
+L<[perl #128445]|https://rt.perl.org/Public/Bug/Display.html?id=128445>
+L<[perl #128972]|https://rt.perl.org/Public/Bug/Display.html?id=128972>
+L<[cpan #120032]|https://rt.cpan.org/Public/Bug/Display.html?id=120032>
+
+=back
+
+=head1 Configuration and Compilation
+
+=over 4
+
+=item *
+
+When building with GCC 6 and link-time optimization (the B<-flto> option to
+B<gcc>), F<Configure> was treating all probed symbols as present on the system,
+regardless of whether they actually exist.  This has been fixed.
+L<[perl #128131]|https://rt.perl.org/Public/Bug/Display.html?id=128131>
+
+=item *
+
+F<Configure> now aborts if both C<-Duselongdouble> and C<-Dusequadmath> are
+requested.
+L<[perl #126203]|https://rt.perl.org/Public/Bug/Display.html?id=126203>
+
+=item *
+
+Fixed a bug in which F<Configure> could append C<-quadmath> to the archname
+even if it was already present.
+L<[perl #128538]|https://rt.perl.org/Public/Bug/Display.html?id=128538>
+
+=item *
+
+Clang builds with C<-DPERL_GLOBAL_STRUCT> or C<-DPERL_GLOBAL_STRUCT_PRIVATE>
+have been fixed (by disabling Thread Safety Analysis for these configurations).
+
+=back
+
+=head1 Platform Support
+
+=head2 Platform-Specific Notes
+
+=over 4
+
+=item VMS
+
+=over 4
+
+=item *
+
+C<configure.com> now recognizes the VSI-branded C compiler.
+
+=back
+
+=item Windows
+
+=over 4
+
+=item *
+
+Building XS modules with GCC 6 in a 64-bit build of Perl failed due to
+incorrect mapping of C<strtoll> and C<strtoull>.  This has now been fixed.
+L<[perl #131726]|https://rt.perl.org/Public/Bug/Display.html?id=131726>
+L<[cpan #121683]|https://rt.cpan.org/Public/Bug/Display.html?id=121683>
+L<[cpan #122353]|https://rt.cpan.org/Public/Bug/Display.html?id=122353>
+
+=back
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+C<< /@0{0*-E<gt>@*/*0 >> and similar contortions used to crash, but no longer
+do, but merely produce a syntax error.
+L<[perl #128171]|https://rt.perl.org/Public/Bug/Display.html?id=128171>
+
+=item *
+
+C<do> or C<require> with an argument which is a reference or typeglob which,
+when stringified, contains a null character, started crashing in Perl 5.20, but
+has now been fixed.
+L<[perl #128182]|https://rt.perl.org/Public/Bug/Display.html?id=128182>
+
+=item *
+
+Expressions containing an C<&&> or C<||> operator (or their synonyms C<and> and
+C<or>) were being compiled incorrectly in some cases.  If the left-hand side
+consisted of either a negated bareword constant or a negated C<do {}> block
+containing a constant expression, and the right-hand side consisted of a
+negated non-foldable expression, one of the negations was effectively ignored.
+The same was true of C<if> and C<unless> statement modifiers, though with the
+left-hand and right-hand sides swapped.  This long-standing bug has now been
+fixed.
+L<[perl #127952]|https://rt.perl.org/Public/Bug/Display.html?id=127952>
+
+=item *
+
+C<reset> with an argument no longer crashes when encountering stash entries
+other than globs.
+L<[perl #128106]|https://rt.perl.org/Public/Bug/Display.html?id=128106>
+
+=item *
+
+Assignment of hashes to, and deletion of, typeglobs named C<*::::::> no longer
+causes crashes.
+L<[perl #128086]|https://rt.perl.org/Public/Bug/Display.html?id=128086>
+
+=item *
+
+Assignment variants of any bitwise ops under the C<bitwise> feature would crash
+if the left-hand side was an array or hash.
+L<[perl #128204]|https://rt.perl.org/Public/Bug/Display.html?id=128204>
+
+=item *
+
+C<socket> now leaves the error code returned by the system in C<$!> on failure.
+L<[perl #128316]|https://rt.perl.org/Public/Bug/Display.html?id=128316>
+
+=item *
+
+Parsing bad POSIX charclasses no longer leaks memory.
+L<[perl #128313]|https://rt.perl.org/Public/Bug/Display.html?id=128313>
+
+=item *
+
+Since Perl 5.20, line numbers have been off by one when perl is invoked with
+the B<-x> switch.  This has been fixed.
+L<[perl #128508]|https://rt.perl.org/Public/Bug/Display.html?id=128508>
+
+=item *
+
+Some obscure cases of subroutines and file handles being freed at the same time
+could result in crashes, but have been fixed.  The crash was introduced in Perl
+5.22.
+L<[perl #128597]|https://rt.perl.org/Public/Bug/Display.html?id=128597>
+
+=item *
+
+Some regular expression parsing glitches could lead to assertion failures with
+regular expressions such as C</(?E<lt>=/> and C</(?E<lt>!/>.  This has now been
+fixed.
+L<[perl #128170]|https://rt.perl.org/Public/Bug/Display.html?id=128170>
+
+=item *
+
+C<gethostent> and similar functions now perform a null check internally, to
+avoid crashing with the torsocks library.  This was a regression from Perl
+5.22.
+L<[perl #128740]|https://rt.perl.org/Public/Bug/Display.html?id=128740>
+
+=item *
+
+Mentioning the same constant twice in a row (which is a syntax error) no longer
+fails an assertion under debugging builds.  This was a regression from Perl
+5.20.
+L<[perl #126482]|https://rt.perl.org/Public/Bug/Display.html?id=126482>
+
+=item *
+
+In Perl 5.24 C<fchown> was changed not to accept negative one as an argument
+because in some platforms that is an error.  However, in some other platforms
+that is an acceptable argument.  This change has been reverted.
+L<[perl #128967]|https://rt.perl.org/Public/Bug/Display.html?id=128967>.
+
+=item *
+
+C<@{x> followed by a newline where C<"x"> represents a control or non-ASCII
+character no longer produces a garbled syntax error message or a crash.
+L<[perl #128951]|https://rt.perl.org/Public/Bug/Display.html?id=128951>
+
+=item *
+
+A regression in Perl 5.24 with C<tr/\N{U+...}/foo/> when the code point was
+between 128 and 255 has been fixed.
+L<[perl #128734]|https://rt.perl.org/Public/Bug/Display.html?id=128734>.
+
+=item *
+
+Many issues relating to C<printf "%a"> of hexadecimal floating point were
+fixed.  In addition, the "subnormals" (formerly known as "denormals") floating
+point numbers are now supported both with the plain IEEE 754 floating point
+numbers (64-bit or 128-bit) and the x86 80-bit "extended precision".  Note that
+subnormal hexadecimal floating point literals will give a warning about
+"exponent underflow".
+L<[perl #128843]|https://rt.perl.org/Public/Bug/Display.html?id=128843>
+L<[perl #128888]|https://rt.perl.org/Public/Bug/Display.html?id=128888>
+L<[perl #128889]|https://rt.perl.org/Public/Bug/Display.html?id=128889>
+L<[perl #128890]|https://rt.perl.org/Public/Bug/Display.html?id=128890>
+L<[perl #128893]|https://rt.perl.org/Public/Bug/Display.html?id=128893>
+L<[perl #128909]|https://rt.perl.org/Public/Bug/Display.html?id=128909>
+L<[perl #128919]|https://rt.perl.org/Public/Bug/Display.html?id=128919>
+
+=item *
+
+The parser could sometimes crash if a bareword came after C<evalbytes>.
+L<[perl #129196]|https://rt.perl.org/Public/Bug/Display.html?id=129196>
+
+=item *
+
+Fixed a place where the regex parser was not setting the syntax error correctly
+on a syntactically incorrect pattern.
+L<[perl #129122]|https://rt.perl.org/Public/Bug/Display.html?id=129122>
+
+=item *
+
+A vulnerability in Perl's C<sprintf> implementation has been fixed by avoiding
+a possible memory wrap.
+L<[perl #131260]|https://rt.perl.org/Public/Bug/Display.html?id=131260>
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.24.3 represents approximately 2 months of development since Perl 5.24.2
+and contains approximately 3,200 lines of changes across 120 files from 23
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 1,600 lines of changes to 56 .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 5.24.3:
+
+Aaron Crane, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins, Daniel
+Dragan, Dave Cross, David Mitchell, Eric Herman, Father Chrysostomos, H.Merijn
+Brand, Hugo van der Sanden, James E Keenan, Jarkko Hietaniemi, John SJ
+Anderson, Karl Williamson, Ken Brown, Lukas Mai, Matthew Horsfall, Stevan
+Little, Steve Hay, Steven Humphrey, Tony Cook, Yves Orton.
+
+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
+L<https://rt.perl.org/> .  There may also be information at
+L<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 see
+L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION> for details of how to
+report the issue.
+
+=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 d22e0f2048..a6c64367f0 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -2,307 +2,383 @@
 
 =head1 NAME
 
-perldelta - what is new for perl v5.24.3
+[ 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 v5.24.4
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.24.2 release and the 5.24.3
+This document describes differences between the 5.24.3 release and the 5.24.4
 release.
 
-If you are upgrading from an earlier release such as 5.24.1, first read
-L<perl5242delta>, which describes differences between 5.24.1 and 5.24.2.
+If you are upgrading from an earlier release such as 5.24.2, first read
+L<perl5243delta>, which describes differences between 5.24.2 and 5.24.3.
 
-=head1 Security
+=head1 Notice
 
-=head2 [CVE-2017-12837] Heap buffer overflow in regular expression compiler
+XXX Any important notices here
 
-Compiling certain regular expression patterns with the case-insensitive
-modifier could cause a heap buffer overflow and crash perl.  This has now been
-fixed.
-L<[perl #131582]|https://rt.perl.org/Public/Bug/Display.html?id=131582>
+=head1 Core Enhancements
 
-=head2 [CVE-2017-12883] Buffer over-read in regular expression parser
+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.
 
-For certain types of syntax error in a regular expression pattern, the error
-message could either contain the contents of a random, possibly large, chunk of
-memory, or could crash perl.  This has now been fixed.
-L<[perl #131598]|https://rt.perl.org/Public/Bug/Display.html?id=131598>
+[ List each enhancement as a =head2 entry ]
+
+=head1 Security
 
-=head2 [CVE-2017-12814] C<$ENV{$key}> stack buffer overflow on Windows
+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.
 
-A possible stack buffer overflow in the C<%ENV> code on Windows has been fixed
-by removing the buffer completely since it was superfluous anyway.
-L<[perl #131665]|https://rt.perl.org/Public/Bug/Display.html?id=131665>
+[ List each security issue as a =head2 entry ]
 
 =head1 Incompatible Changes
 
-There are no changes intentionally incompatible with 5.24.2.  If any exist,
-they are bugs, and we request that you submit a report.  See L</Reporting
-Bugs> below.
+XXX For a release on a stable branch, this section aspires to be:
 
-=head1 Modules and Pragmata
+    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.
 
-=head2 Updated Modules and Pragmata
+[ List each incompatible change as a =head2 entry ]
 
-=over 4
+=head1 Deprecations
 
-=item *
+XXX Any deprecated features, syntax, modules etc. should be listed here.
 
-L<Module::CoreList> has been upgraded from version 5.20170715_24 to
-5.20170922_24.
+=head2 Module removals
 
-=item *
+XXX Remove this section if inapplicable.
 
-L<POSIX> has been upgraded from version 1.65 to 1.65_01.
+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.
+
+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.
+
+=over
 
-L<Time::HiRes> has been upgraded from version 1.9733 to 1.9741.
+=item XXX
 
-L<[perl #128427]|https://rt.perl.org/Public/Bug/Display.html?id=128427>
-L<[perl #128445]|https://rt.perl.org/Public/Bug/Display.html?id=128445>
-L<[perl #128972]|https://rt.perl.org/Public/Bug/Display.html?id=128972>
-L<[cpan #120032]|https://rt.cpan.org/Public/Bug/Display.html?id=120032>
+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.
 
 =back
 
-=head1 Configuration and Compilation
+[ List each other deprecation as a =head2 entry ]
+
+=head1 Performance Enhancements
+
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
+
+[ List each enhancement as a =item entry ]
 
 =over 4
 
 =item *
 
-When building with GCC 6 and link-time optimization (the B<-flto> option to
-B<gcc>), F<Configure> was treating all probed symbols as present on the system,
-regardless of whether they actually exist.  This has been fixed.
-L<[perl #128131]|https://rt.perl.org/Public/Bug/Display.html?id=128131>
+XXX
+
+=back
+
+=head1 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>.  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.
+
+[ Within each section, list entries as a =item entry ]
+
+=head2 New Modules and Pragmata
+
+=over 4
 
 =item *
 
-F<Configure> now aborts if both C<-Duselongdouble> and C<-Dusequadmath> are
-requested.
-L<[perl #126203]|https://rt.perl.org/Public/Bug/Display.html?id=126203>
+XXX
+
+=back
+
+=head2 Updated Modules and Pragmata
+
+=over 4
 
 =item *
 
-Fixed a bug in which F<Configure> could append C<-quadmath> to the archname
-even if it was already present.
-L<[perl #128538]|https://rt.perl.org/Public/Bug/Display.html?id=128538>
+L<XXX> has been upgraded from version A.xx to B.yy.
+
+=back
+
+=head2 Removed Modules and Pragmata
+
+=over 4
 
 =item *
 
-Clang builds with C<-DPERL_GLOBAL_STRUCT> or C<-DPERL_GLOBAL_STRUCT_PRIVATE>
-have been fixed (by disabling Thread Safety Analysis for these configurations).
+XXX
 
 =back
 
-=head1 Platform Support
+=head1 Documentation
 
-=head2 Platform-Specific Notes
+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>.
 
-=over 4
+=head2 New Documentation
+
+XXX Changes which create B<new> files in F<pod/> go here.
 
-=item VMS
+=head3 L<XXX>
+
+XXX Description of the purpose of the new file here
+
+=head2 Changes to Existing Documentation
+
+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 *
 
-C<configure.com> now recognizes the VSI-branded C compiler.
+XXX Description of the change here
 
 =back
 
-=item Windows
+=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 *
 
-Building XS modules with GCC 6 in a 64-bit build of Perl failed due to
-incorrect mapping of C<strtoll> and C<strtoull>.  This has now been fixed.
-L<[perl #131726]|https://rt.perl.org/Public/Bug/Display.html?id=131726>
-L<[cpan #121683]|https://rt.cpan.org/Public/Bug/Display.html?id=121683>
-L<[cpan #122353]|https://rt.cpan.org/Public/Bug/Display.html?id=122353>
+XXX L<message|perldiag/"message">
 
 =back
 
+=head3 New Warnings
+
+=over 4
+
+=item *
+
+XXX L<message|perldiag/"message">
+
 =back
 
-=head1 Selected Bug Fixes
+=head2 Changes to Existing Diagnostics
+
+XXX Changes (i.e. rewording) of diagnostic messages go here
 
 =over 4
 
 =item *
 
-C<< /@0{0*-E<gt>@*/*0 >> and similar contortions used to crash, but no longer
-do, but merely produce a syntax error.
-L<[perl #128171]|https://rt.perl.org/Public/Bug/Display.html?id=128171>
+XXX Describe change here
 
-=item *
+=back
 
-C<do> or C<require> with an argument which is a reference or typeglob which,
-when stringified, contains a null character, started crashing in Perl 5.20, but
-has now been fixed.
-L<[perl #128182]|https://rt.perl.org/Public/Bug/Display.html?id=128182>
+=head1 Utility Changes
 
-=item *
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directory F<utils>.
 
-Expressions containing an C<&&> or C<||> operator (or their synonyms C<and> and
-C<or>) were being compiled incorrectly in some cases.  If the left-hand side
-consisted of either a negated bareword constant or a negated C<do {}> block
-containing a constant expression, and the right-hand side consisted of a
-negated non-foldable expression, one of the negations was effectively ignored.
-The same was true of C<if> and C<unless> statement modifiers, though with the
-left-hand and right-hand sides swapped.  This long-standing bug has now been
-fixed.
-L<[perl #127952]|https://rt.perl.org/Public/Bug/Display.html?id=127952>
+[ 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. ]
 
-=item *
+=head2 L<XXX>
 
-C<reset> with an argument no longer crashes when encountering stash entries
-other than globs.
-L<[perl #128106]|https://rt.perl.org/Public/Bug/Display.html?id=128106>
+=over 4
 
 =item *
 
-Assignment of hashes to, and deletion of, typeglobs named C<*::::::> no longer
-causes crashes.
-L<[perl #128086]|https://rt.perl.org/Public/Bug/Display.html?id=128086>
+XXX
 
-=item *
+=back
+
+=head1 Configuration and Compilation
 
-Assignment variants of any bitwise ops under the C<bitwise> feature would crash
-if the left-hand side was an array or hash.
-L<[perl #128204]|https://rt.perl.org/Public/Bug/Display.html?id=128204>
+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.
 
-=item *
+[ List changes as a =item entry ].
 
-C<socket> now leaves the error code returned by the system in C<$!> on failure.
-L<[perl #128316]|https://rt.perl.org/Public/Bug/Display.html?id=128316>
+=over 4
 
 =item *
 
-Parsing bad POSIX charclasses no longer leaks memory.
-L<[perl #128313]|https://rt.perl.org/Public/Bug/Display.html?id=128313>
+XXX
 
-=item *
+=back
 
-Since Perl 5.20, line numbers have been off by one when perl is invoked with
-the B<-x> switch.  This has been fixed.
-L<[perl #128508]|https://rt.perl.org/Public/Bug/Display.html?id=128508>
+=head1 Testing
 
-=item *
+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.
 
-Some obscure cases of subroutines and file handles being freed at the same time
-could result in crashes, but have been fixed.  The crash was introduced in Perl
-5.22.
-L<[perl #128597]|https://rt.perl.org/Public/Bug/Display.html?id=128597>
+[ List each test improvement as a =item entry ]
+
+=over 4
 
 =item *
 
-Some regular expression parsing glitches could lead to assertion failures with
-regular expressions such as C</(?E<lt>=/> and C</(?E<lt>!/>.  This has now been
-fixed.
-L<[perl #128170]|https://rt.perl.org/Public/Bug/Display.html?id=128170>
+XXX
 
-=item *
+=back
 
-C<gethostent> and similar functions now perform a null check internally, to
-avoid crashing with the torsocks library.  This was a regression from Perl
-5.22.
-L<[perl #128740]|https://rt.perl.org/Public/Bug/Display.html?id=128740>
+=head1 Platform Support
 
-=item *
+XXX Any changes to platform support should be listed in the sections below.
 
-Mentioning the same constant twice in a row (which is a syntax error) no longer
-fails an assertion under debugging builds.  This was a regression from Perl
-5.20.
-L<[perl #126482]|https://rt.perl.org/Public/Bug/Display.html?id=126482>
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
 
-=item *
+=head2 New Platforms
 
-In Perl 5.24 C<fchown> was changed not to accept negative one as an argument
-because in some platforms that is an error.  However, in some other platforms
-that is an acceptable argument.  This change has been reverted.
-L<[perl #128967]|https://rt.perl.org/Public/Bug/Display.html?id=128967>.
+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
 
-C<@{x> followed by a newline where C<"x"> represents a control or non-ASCII
-character no longer produces a garbled syntax error message or a crash.
-L<[perl #128951]|https://rt.perl.org/Public/Bug/Display.html?id=128951>
+=item XXX-some-platform
 
-=item *
+XXX
 
-A regression in Perl 5.24 with C<tr/\N{U+...}/foo/> when the code point was
-between 128 and 255 has been fixed.
-L<[perl #128734]|https://rt.perl.org/Public/Bug/Display.html?id=128734>.
+=back
 
-=item *
+=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 ]
 
-Many issues relating to C<printf "%a"> of hexadecimal floating point were
-fixed.  In addition, the "subnormals" (formerly known as "denormals") floating
-point numbers are now supported both with the plain IEEE 754 floating point
-numbers (64-bit or 128-bit) and the x86 80-bit "extended precision".  Note that
-subnormal hexadecimal floating point literals will give a warning about
-"exponent underflow".
-L<[perl #128843]|https://rt.perl.org/Public/Bug/Display.html?id=128843>
-L<[perl #128888]|https://rt.perl.org/Public/Bug/Display.html?id=128888>
-L<[perl #128889]|https://rt.perl.org/Public/Bug/Display.html?id=128889>
-L<[perl #128890]|https://rt.perl.org/Public/Bug/Display.html?id=128890>
-L<[perl #128893]|https://rt.perl.org/Public/Bug/Display.html?id=128893>
-L<[perl #128909]|https://rt.perl.org/Public/Bug/Display.html?id=128909>
-L<[perl #128919]|https://rt.perl.org/Public/Bug/Display.html?id=128919>
+=over 4
 
 =item *
 
-The parser could sometimes crash if a bareword came after C<evalbytes>.
-L<[perl #129196]|https://rt.perl.org/Public/Bug/Display.html?id=129196>
+XXX
+
+=back
+
+=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 *
 
-Fixed a place where the regex parser was not setting the syntax error correctly
-on a syntactically incorrect pattern.
-L<[perl #129122]|https://rt.perl.org/Public/Bug/Display.html?id=129122>
+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 *
 
-A vulnerability in Perl's C<sprintf> implementation has been fixed by avoiding
-a possible memory wrap.
-L<[perl #131260]|https://rt.perl.org/Public/Bug/Display.html?id=131260>
+XXX
 
 =back
 
-=head1 Acknowledgements
+=head1 Errata From Previous Releases
 
-Perl 5.24.3 represents approximately 2 months of development since Perl 5.24.2
-and contains approximately 3,200 lines of changes across 120 files from 23
-authors.
+=over 4
 
-Excluding auto-generated files, documentation and release tools, there were
-approximately 1,600 lines of changes to 56 .pm, .t, .c and .h files.
+=item *
 
-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 5.24.3:
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
 
-Aaron Crane, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins, Daniel
-Dragan, Dave Cross, David Mitchell, Eric Herman, Father Chrysostomos, H.Merijn
-Brand, Hugo van der Sanden, James E Keenan, Jarkko Hietaniemi, John SJ
-Anderson, Karl Williamson, Ken Brown, Lukas Mai, Matthew Horsfall, Stevan
-Little, Steve Hay, Steven Humphrey, Tony Cook, Yves Orton.
+=back
 
-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 Obituary
+
+XXX If any significant core contributor has died, we've added a short obituary
+here.
+
+=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 v5.24.3..HEAD
 
 =head1 Reporting Bugs
 
@@ -318,8 +394,8 @@ 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 see
-L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION> for details of how to
-report the issue.
+L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
+for details of how to report the issue.
 
 =head1 SEE ALSO
 
diff --git a/vms/descrip_mms.template b/vms/descrip_mms.template
index 0751a0996d..6cf854d556 100644
--- a/vms/descrip_mms.template
+++ b/vms/descrip_mms.template
@@ -307,7 +307,7 @@ utils : $(utils1) $(utils2) $(utils3) $(utils4) $(utils5)
 extra.pods : miniperl
 	@ @extra_pods.com
 
-PERLDELTA_CURRENT = [.pod]perl5243delta.pod
+PERLDELTA_CURRENT = [.pod]perl5244delta.pod
 
 $(PERLDELTA_CURRENT) : [.pod]perldelta.pod
 	Copy/NoConfirm/Log $(MMS$SOURCE) $(PERLDELTA_CURRENT)
diff --git a/win32/GNUmakefile b/win32/GNUmakefile
index 81bda5a7e4..8e2baeb9e3 100644
--- a/win32/GNUmakefile
+++ b/win32/GNUmakefile
@@ -1544,7 +1544,7 @@ utils: $(HAVEMINIPERL) ..\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\perl5243delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5244delta.pod
 	$(MINIPERL) -I..\lib $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
 	$(MINIPERL) -I..\lib ..\pod\perlmodlib.PL -q ..
@@ -1640,7 +1640,7 @@ 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 \
-	    perl5243delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5244delta.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 b/win32/Makefile
index 4f406667c1..ad1006485e 100644
--- a/win32/Makefile
+++ b/win32/Makefile
@@ -1215,7 +1215,7 @@ utils: $(PERLEXE) ..\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\perl5243delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5244delta.pod
 	cd ..\win32
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
@@ -1313,7 +1313,7 @@ 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 \
-	    perl5243delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5244delta.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 0692a8039a..9821d72e5b 100644
--- a/win32/makefile.mk
+++ b/win32/makefile.mk
@@ -1511,7 +1511,7 @@ utils: $(HAVEMINIPERL) ..\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\perl5243delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5244delta.pod
 	$(MINIPERL) -I..\lib $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
 	$(MINIPERL) -I..\lib ..\pod\perlmodlib.PL -q ..
@@ -1608,7 +1608,7 @@ 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 \
-	    perl5243delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5244delta.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 7fcd749273..c4e525029c 100644
--- a/win32/pod.mak
+++ b/win32/pod.mak
@@ -49,6 +49,7 @@ POD = perl.pod	\
 	perl5241delta.pod	\
 	perl5242delta.pod	\
 	perl5243delta.pod	\
+	perl5244delta.pod	\
 	perl561delta.pod	\
 	perl56delta.pod	\
 	perl581delta.pod	\
@@ -192,6 +193,7 @@ MAN = perl.man	\
 	perl5241delta.man	\
 	perl5242delta.man	\
 	perl5243delta.man	\
+	perl5244delta.man	\
 	perl561delta.man	\
 	perl56delta.man	\
 	perl581delta.man	\
@@ -335,6 +337,7 @@ HTML = perl.html	\
 	perl5241delta.html	\
 	perl5242delta.html	\
 	perl5243delta.html	\
+	perl5244delta.html	\
 	perl561delta.html	\
 	perl56delta.html	\
 	perl581delta.html	\
@@ -478,6 +481,7 @@ TEX = perl.tex	\
 	perl5241delta.tex	\
 	perl5242delta.tex	\
 	perl5243delta.tex	\
+	perl5244delta.tex	\
 	perl561delta.tex	\
 	perl56delta.tex	\
 	perl581delta.tex	\