+=encoding utf8
+
=head1 NAME
-perldelta - what is new for perl v5.11.0
+perl5110delta - what is new for perl v5.11.0
=head1 DESCRIPTION
-This document describes differences between the 5.10.0 and the 5.11.0
-development releases.
+This document describes differences between the 5.10.0 release and
+the 5.11.0 development release.
=head1 Incompatible Changes
+=head2 Unicode interpretation of \w, \d, \s, and the POSIX character classes redefined.
+
+Previous versions of Perl tried to map POSIX style character class definitions onto
+Unicode property names so that patterns would "dwim" when matches were made against latin-1 or
+unicode strings. This proved to be a mistake, breaking character class negation, causing
+forward compatibility problems (as Unicode keeps updating their property definitions and adding
+new characters), and other problems.
+
+Therefore we have now defined a new set of artificial "unicode" property names which will be
+used to do unicode matching of patterns using POSIX style character classes and perl short-form
+escape character classes like \w and \d.
+
+The key change here is that \d will no longer match every digit in the unicode standard
+(there are thousands) nor will \w match every word character in the standard, instead they
+will match precisely their POSIX or Perl definition.
+
+Those needing to match based on Unicode properties can continue to do so by using the \p{} syntax
+to match whichever property they like, including the new artificial definitions.
+
+B<NOTE:> This is a backwards incompatible no-warning change in behaviour. If you are upgrading
+and you process large volumes of text look for POSIX and Perl style character classes and
+change them to the relevent property name (by removing the word 'Posix' from the current name).
+
+The following table maps the POSIX character class names, the escapes and the old and new
+Unicode property mappings:
+
+ POSIX Esc Class New-Property ! Old-Property
+ ----------------------------------------------+-------------
+ alnum [0-9A-Za-z] IsPosixAlnum ! IsAlnum
+ alpha [A-Za-z] IsPosixAlpha ! IsAlpha
+ ascii [\000-\177] IsASCII = IsASCII
+ blank [\011 ] IsPosixBlank !
+ cntrl [\0-\37\177] IsPosixCntrl ! IsCntrl
+ digit \d [0-9] IsPosixDigit ! IsDigit
+ graph [!-~] IsPosixGraph ! IsGraph
+ lower [a-z] IsPosixLower ! IsLower
+ print [ -~] IsPosixPrint ! IsPrint
+ punct [!-/:-@[-`{-~] IsPosixPunct ! IsPunct
+ space [\11-\15 ] IsPosixSpace ! IsSpace
+ \s [\11\12\14\15 ] IsPerlSpace ! IsSpacePerl
+ upper [A-Z] IsPosixUpper ! IsUpper
+ word \w [0-9A-Z_a-z] IsPerlWord ! IsWord
+ xdigit [0-9A-Fa-f] IsXDigit = IsXDigit
+
+If you wish to build perl with the old mapping you may do so by setting
+
+ #define PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS 1
+
+in regcomp.h, and then setting
+
+ PERL_TEST_LEGACY_POSIX_CC
+
+to true your enviornment when testing.
+
+
+=head2 In @INC, move ARCHLIB and PRIVLIB after the current version's site_perl and vendor_perl.
+
=head2 Switch statement changes
The handling of complex expressions by the C<given>/C<when> switch
-statement has been enhanced. There are two new cases where C<when> now
+statement has been enhanced. These enhancements are also available in
+5.10.1 and subsequent 5.10 releases. There are two new cases where C<when> now
interprets its argument as a boolean, instead of an expression to be used
in a smart match:
context ensures it can now be useful in a C<when()>, notably for
implementing bistable conditions, like in:
- when (/^=begin/ .. /^=end/) { ... }
+ when (/^=begin/ .. /^=end/) {
+ # do something
+ }
=item defined-or operator
The next section details more changes brought to the semantics to
the smart match operator, that naturally also modify the behaviour
of the switch statements where smart matching is implicitly used.
+These changers were also made for the 5.10.1 release, and will remain in
+subsequent 5.10 releases.
=head2 Smart match changes
The smart match operator C<~~> is no longer commutative. The behaviour of
a smart match now depends primarily on the type of its right hand
-argument. Moreover, its semantics has been adjusted for greater
+argument. Moreover, its semantics have been adjusted for greater
consistency or usefulness in several cases. While the general backwards
compatibility is maintained, several changes must be noted:
object overloads the stringification or the numification operators, and
if overload fallback is active, it will be used instead, as usual.)
+=head2 Labels can't be keywords
+
+Labels used as targets for the C<goto>, C<last>, C<next> or C<redo>
+statements cannot be keywords anymore. This restriction will prevent
+potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes:
+for example, a statement like C<goto print> would jump to a label whose
+name would be the return value of C<print()>, (usually 1), instead of a
+label named C<print>. Moreover, the other control flow statements
+would just ignore any keyword passed to them as a label name. Since
+such labels cannot be defined anymore, this kind of error will be
+avoided.
+
+=head2 Other incompatible changes
+
+=over 4
+
+=item *
+
+The semantics of C<use feature :5.10*> have changed slightly.
+See L<"Modules and Pragmata"> for more information.
+
+=item *
+
+It is now a run-time error to use the smart match operator C<~~>
+with an object that has no overload defined for it. (This way
+C<~~> will not break encapsulation by matching against the
+object's internal representation as a reference.)
+
+=item *
+
+The version control system used for the development of the perl
+interpreter has been switched from Perforce to git. This is mainly an
+internal issue that only affects people actively working on the perl core;
+but it may have minor external visibility, for example in some of details
+of the output of C<perl -V>. See L<perlrepository> for more information.
+
+=item *
+
+The internal structure of the C<ext/> directory in the perl source has
+been reorganised. In general, a module C<Foo::Bar> whose source was
+stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also,
+nearly all dual-life modules have been moved from F<lib/> to F<ext/>. This
+is purely a source tarball change, and should make no difference to the
+compilation or installation of perl, unless you have a very customised build
+process that explicitly relies on this structure, or which hard-codes the
+C<nonxs_ext> F<Configure> parameter. Specifically, this change does not by
+default alter the location of any files in the final installation.
+
+=item *
+
+As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental
+C<Test::Harness::Straps> module has been removed.
+See L</"Updated Modules"> for more details.
+
+=item *
+
+As part of the C<ExtUtils::MakeMaker> upgrade, the
+C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> modules
+have been removed from this distribution.
+
+=item *
+
+C<Module::CoreList> no longer contains the C<%:patchlevel> hash.
+
+=item *
+
+This one is actually a change introduced in 5.10.0, but it was missed
+from that release's perldelta, so it is mentioned here instead.
+
+A bugfix related to the handling of the C</m> modifier and C<qr> resulted
+in a change of behaviour between 5.8.x and 5.10.0:
+
+ # matches in 5.8.x, doesn't match in 5.10.0
+ $re = qr/^bar/; "foo\nbar" =~ /$re/m;
+
+=item *
+
+C<length undef> now returns undef.
+
+=back
+
=head1 Core Enhancements
+=head2 Unicode Character Database 5.1.0
+
+The copy of the Unicode Character Database included in Perl 5.11.0 has
+been updated to 5.1.0 from 5.0.0. See
+L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the
+notable changes.
+
+=head2 A proper interface for pluggable Method Resolution Orders
+
+As of Perl 5.11.0 there is a new interface for plugging and using method
+resolution orders other than the default (linear depth first search).
+The C3 method resolution order added in 5.10.0 has been re-implemented as
+a plugin, without changing its Perl-space interface. See L<perlmroapi> for
+more information.
+
=head2 The C<overloading> pragma
This pragma allows you to lexically disable or enable overloading
scripts itself, and there is no standard interface to C<make> utilities to
interact with their job schedulers.
+Note that currently some test scripts may fail when run in parallel (most
+notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts
+again sequentially and see if the failures go away.
+
+=head2 The C<...> operator
+
+A new operator, C<...>, nicknamed the Yada Yada operator, has been added.
+It is intended to mark placeholder code, that is not yet implemented.
+See L<perlop/"Yada Yada Operator">. (chromatic)
+
+=head2 DTrace support
+
+Some support for DTrace has been added. See "DTrace support" in F<INSTALL>.
+
+=head2 Support for C<configure_requires> in CPAN module metadata
+
+Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword
+in the F<META.yml> metadata file included in most recent CPAN distributions.
+This allows distribution authors to specify configuration prerequisites that
+must be installed before running F<Makefile.PL> or F<Build.PL>.
+
+See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more
+on how to specify C<configure_requires> when creating a distribution for CPAN.
+
+=head2 The C<each> function can now operate on arrays
+
+=head2 Perl's core time-related functions are now Y2038 compliand
+
+=head2 The variable C<$,> may now be tied
+
+=head2 // now behaves like || in when clauses
+
+=head2 You can now set C<-W> from the C<PERL5OPT> environment varialbe
+
=head1 Modules and Pragmata
+=head2 New Modules and Pragmata
+
+=over 4
+
+=item C<autodie>
+
+This is a new lexically-scoped alternative for the C<Fatal> module.
+The bundled version is 2.06_01. Note that in this release, using a string
+eval when C<autodie> is in effect can cause the autodie behaviour to leak
+into the surrounding scope. See L<autodie/"BUGS"> for more details.
+
+=item C<Compress::Raw::Bzip2>
+
+This has been added to the core (version 2.020).
+
+=item C<parent>
+
+This pragma establishes an ISA relationship with base classes at compile
+time. It provides the key feature of C<base> without the feature creep.
+
+=item C<Parse::CPAN::Meta>
+
+This has been added to the core (version 1.39).
+
+=back
+
=head2 Pragmata Changes
=over 4
See L</"The C<overloading> pragma"> above.
-=back
+=item C<attributes>
-=head1 Utility Changes
+Upgraded from version 0.08 to 0.09.
-=head1 Documentation
+=item C<attrs>
-=head1 Performance Enhancements
+The C<attrs> pragma has been removed. It had been marked as deprecated since
+5.6.0.
-=head1 Installation and Configuration Improvements
+=item C<base>
-=head1 Selected Bug Fixes
+Upgraded from version 2.13 to 2.14. See L<parent> for a replacement.
-=over 4
+=item C<bigint>
-=item C<-I> on shebang line now adds directories in front of @INC
+Upgraded from version 0.22 to 0.23.
-as documented, and as does C<-I> when specified on the command-line.
-(Renée Bäcker)
+=item C<bignum>
+
+Upgraded from version 0.22 to 0.23.
+
+=item C<bigrat>
+
+Upgraded from version 0.22 to 0.23.
+
+=item C<charnames>
+
+Upgraded from version 1.06 to 1.07.
+
+The Unicode F<NameAliases.txt> database file has been added. This has the
+effect of adding some extra C<\N> character names that formerly wouldn't
+have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">.
+
+=item C<constant>
+
+Upgraded from version 1.13 to 1.19. Some code has been shifted from run time to
+compile time, and the amount of MRO cache flushing has been minimised.
+
+=item C<feature>
+
+The meaning of the C<:5.10> and C<:5.10.X> feature bundles has
+changed slightly. The last component, if any (i.e. C<X>) is simply ignored.
+This is predicated on the assumption that new features will not, in
+general, be added to maintenance releases. So C<:5.10> and C<:5.10.X>
+have identical effect. This is a change to the behaviour documented for
+5.10.0.
+
+=item C<fields>
+
+Upgraded from version 2.13 to 2.14 (this was just a version bump; there
+were no functional changes).
+
+=item C<lib>
+
+Upgraded from version 0.5565 to 0.62.
+
+=item C<open>
+
+Upgraded from version 1.06 to 1.07.
+
+=item C<overload>
+
+Upgraded from version 1.06 to 1.07.
+
+=item C<overloading>
+
+See L</"The C<overloading> pragma"> above.
+
+=item C<mro>
+
+Upgraded from version 1.00 to 1.01. Performance for single inheritance is 40%
+faster - see L</"Performance Enhancements"> below.
+
+C<mro> is now implemented as an XS extension. The documented interface has not
+changed. Code relying on the implementation detail that some C<mro::>
+methods happened to be available at all times gets to "keep both pieces".
+
+=item C<version>
+
+Upgraded from version 0.74 to 0.77.
=back
-=head1 New or Changed Diagnostics
+=head2 Updated Modules
-=head1 Changed Internals
+=over 4
-=head1 Known Problems
+=item C<Archive::Extract>
-=head2 Platform Specific Problems
+Upgraded from version 0.24 to 0.34.
-=head1 Reporting Bugs
+=item C<Archive::Tar>
-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://bugs.perl.org/ . There may also be
-information at http://www.perl.org/ , the Perl Home Page.
+Upgraded from version 1.38 to 1.52.
-If you believe you have an unreported bug, please run the B<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.
+=item C<Attribute::Handlers>
-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 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.
+Upgraded from version 0.79 to 0.85.
-=head1 SEE ALSO
+=item C<AutoLoader>
-The F<Changes> file for exhaustive details on what changed.
+Upgraded from version 5.63 to 5.68.
-The F<INSTALL> file for how to build Perl.
+=item C<AutoSplit>
-The F<README> file for general stuff.
+Upgraded from version 1.05 to 1.06.
-The F<Artistic> and F<Copying> files for copyright information.
+=item C<B>
+
+Upgraded from version 1.17 to 1.22.
+
+=item C<B::Debug>
+
+Upgraded from version 1.05 to 1.11.
+
+=item C<B::Deparse>
+
+Upgraded from version 0.83 to 0.89.
+
+=item C<B::Lint>
+
+Upgraded from version 1.09 to 1.11.
+
+=item C<B::Xref>
+
+Upgraded from version 1.01 to 1.02.
+
+=item C<Benchmark>
+
+Upgraded from version 1.10 to 1.11.
+
+=item C<Carp>
+
+Upgraded from version 1.08 to 1.11.
+
+L<Carp> now includes all the necessary code to function. Previously, it
+used to be a lightweight placeholder that loaded the actual code from
+C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module
+kept for backwards compatibility for programs that used to pre-load it.
+
+=item C<CGI>
+
+Upgraded from version 3.29 to 3.43.
+(also includes the "default_value for popup_menu()" fix from 3.45).
+
+=item C<Compress::Zlib>
+
+Upgraded from version 2.008 to 2.020.
+
+=item C<CPAN>
+
+Upgraded from version 1.9205 to 1.9402. C<CPAN::FTP> has a local fix to
+stop it being too verbose on download failure.
+
+=item C<CPANPLUS>
+
+Upgraded from version 0.84 to 0.88.
+
+=item C<CPANPLUS::Dist::Build>
+
+Upgraded from version 0.06_02 to 0.36.
+
+=item C<Cwd>
+
+Upgraded from version 3.25_01 to 3.30.
+
+=item C<Data::Dumper>
+
+Upgraded from version 2.121_14 to 2.124.
+
+=item C<DB>
+
+Upgraded from version 1.01 to 1.02.
+
+=item C<DB_File>
+
+Upgraded from version 1.816_1 to 1.820.
+
+=item C<Devel::PPPort>
+
+Upgraded from version 3.13 to 3.19.
+
+=item C<Digest::MD5>
+
+Upgraded from version 2.36_01 to 2.39.
+
+=item C<Digest::SHA>
+
+Upgraded from version 5.45 to 5.47.
+
+=item C<DirHandle>
+
+Upgraded from version 1.01 to 1.03.
+
+=item C<Dumpvalue>
+
+Upgraded from version 1.12 to 1.13.
+
+=item C<DynaLoader>
+
+Upgraded from version 1.08 to 1.10.
+
+=item C<Encode>
+
+Upgraded from version 2.23 to 2.35.
+
+=item C<Errno>
+
+Upgraded from version 1.10 to 1.11.
+
+=item C<Exporter>
+
+Upgraded from version 5.62 to 5.63.
+
+=item C<ExtUtils::CBuilder>
+
+Upgraded from version 0.21 to 0.2602.
+
+=item C<ExtUtils::Command>
+
+Upgraded from version 1.13 to 1.16.
+
+=item C<ExtUtils::Constant>
+
+Upgraded from 0.20 to 0.22. (Note that neither of these versions are
+available on CPAN.)
+
+=item C<ExtUtils::Embed>
+
+Upgraded from version 1.27 to 1.28.
+
+=item C<ExtUtils::Install>
+
+Upgraded from version 1.44 to 1.54.
+
+=item C<ExtUtils::MakeMaker>
+
+Upgraded from version 6.42 to 6.55_02.
+
+Note that C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish>
+have been removed from this distribution.
+
+=item C<ExtUtils::Manifest>
+
+Upgraded from version 1.51_01 to 1.56.
+
+=item C<ExtUtils::ParseXS>
+
+Upgraded from version 2.18_02 to 2.2002.
+
+=item C<Fatal>
+
+Upgraded from version 1.05 to 2.06_01. See also the new pragma C<autodie>.
+
+=item C<File::Basename>
+
+Upgraded from version 2.76 to 2.77.
+
+=item C<File::Compare>
+
+Upgraded from version 1.1005 to 1.1006.
+
+=item C<File::Copy>
+
+Upgraded from version 2.11 to 2.16.
+
+File::Copy now always return 0 (not "") on failure.
+
+FIXME - describe C<cp>
+
+=item C<File::Fetch>
+
+Upgraded from version 0.14 to 0.20.
+
+=item C<File::Find>
+
+Upgraded from version 1.12 to 1.14.
+
+=item C<File::Path>
+
+Upgraded from version 2.04 to 2.07_03.
+
+=item C<File::Spec>
+
+Upgraded from version 3.2501 to 3.30.
+
+=item C<File::stat>
+
+Upgraded from version 1.00 to 1.01.
+
+Added -X overloading, -M, -C and -A.
+
+=item C<File::Temp>
+
+Upgraded from version 0.18 to 0.22.
+
+=item C<FileCache>
+
+Upgraded from version 1.07 to 1.08.
+
+=item C<FileHandle>
+
+Upgraded from version 2.01 to 2.02.
+
+=item C<Filter::Simple>
+
+Upgraded from version 0.82 to 0.84.
+
+=item C<Filter::Util::Call>
+
+Upgraded from version 1.07 to 1.08.
+
+=item C<FindBin>
+
+Upgraded from version 1.49 to 1.50.
+
+=item C<GDBM_File>
+
+Upgraded from version 1.08 to 1.09.
+
+=item C<Getopt::Long>
+
+Upgraded from version 2.37 to 2.38.
+
+=item C<Hash::Util::FieldHash>
+
+Upgraded from version 1.03 to 1.04. This fixes a memory leak.
+
+=item C<I18N::Collate>
+
+Upgraded from version 1.00 to 1.01.
+
+=item C<IO>
+
+Upgraded from version 1.23_01 to 1.25.
+
+This makes non-blocking mode work on Windows in C<IO::Socket::INET>
+[CPAN #43573].
+
+=item C<IO::Compress::*>
+
+Upgraded from version 2.008 to 2.020.
+
+=item C<IO::Dir>
+
+Upgraded from version 1.06 to 1.07.
+
+=item C<IO::Handle>
+
+Upgraded from version 1.27 to 1.28.
+
+=item C<IO::Socket>
+
+Upgraded from version 1.30_01 to 1.31.
+
+=item C<IO::Zlib>
+
+Upgraded from version 1.07 to 1.09.
+
+=item C<IPC::Cmd>
+
+Upgraded from version 0.40_1 to 0.46.
+
+=item C<IPC::Open3>
+
+Upgraded from version 1.02 to 1.04.
+
+=item C<IPC::SysV>
+
+Upgraded from version 1.05 to 2.01.
+
+=item C<lib>
+
+Upgraded from version 0.5565 to 0.62.
+
+=item C<List::Util>
+
+Upgraded from version 1.19 to 1.21.
+
+=item C<Locale::MakeText>
+
+Upgraded from version 1.12 to 1.13.
+
+=item C<Log::Message>
+
+Upgraded from version 0.01 to 0.02.
+
+=item C<Math::BigFloat>
+
+Upgraded from version 1.59 to 1.60.
+
+=item C<Math::BigInt>
+
+Upgraded from version 1.88 to 1.89.
+
+=item C<Math::BigInt::FastCalc>
+
+Upgraded from version 0.16 to 0.19.
+
+=item C<Math::BigRat>
+
+Upgraded from version 0.21 to 0.22.
+
+=item C<Math::Complex>
+
+Upgraded from version 1.37 to 1.56.
+
+=item C<Math::Trig>
+
+Upgraded from version 1.04 to 1.20.
+
+=item C<Memoize>
+
+Upgraded from version 1.01_02 to 1.01_03 (just a minor documentation
+change).
+
+=item C<Module::Build>
+
+Upgraded from version 0.2808_01 to 0.34_02.
+
+=item C<Module::CoreList>
+
+Upgraded from version 2.13 to 2.18. This release no longer contains the
+C<%Module::CoreList::patchlevel> hash.
+
+=item C<Module::Load>
+
+Upgraded from version 0.12 to 0.16.
+
+=item C<Module::Load::Conditional>
+
+Upgraded from version 0.22 to 0.30.
+
+=item C<Module::Loaded>
+
+Upgraded from version 0.01 to 0.02.
+
+=item C<Module::Pluggable>
+
+Upgraded from version 3.6 to 3.9.
+
+=item C<NDBM_File>
+
+Upgraded from version 1.07 to 1.08.
+
+=item C<Net::Ping>
+
+Upgraded from version 2.33 to 2.36.
+
+=item C<NEXT>
+
+Upgraded from version 0.60_01 to 0.64.
+
+=item C<Object::Accessor>
+
+Upgraded from version 0.32 to 0.34.
+
+=item C<OS2::REXX>
+
+Upgraded from version 1.03 to 1.04.
+
+=item C<Package::Constants>
+
+Upgraded from version 0.01 to 0.02.
+
+=item C<PerlIO>
+
+Upgraded from version 1.04 to 1.06.
+
+=item C<PerlIO::via>
+
+Upgraded from version 0.04 to 0.07.
+
+=item C<Pod::Man>
+
+Upgraded from version 2.16 to 2.22.
+
+=item C<Pod::Parser>
+
+Upgraded from version 1.35 to 1.37.
+
+=item C<Pod::Plainer>
+
+Upgraded from version 0.01 to 1.00.
+
+There are no code changes - the version bump is because C<Pod::Plainer> has
+been released to CPAN as a stand alone distribution, and will be removed from
+the core distribution in 5.14.
+
+=item Pod::Perldoc
+
+Upgrade from version 3.14_02 to 3.15.
+
+=item C<Pod::Simple>
+
+Upgraded from version 3.05 to 3.07.
+
+=item C<Pod::Text>
+
+Upgraded from version 3.08 to 3.13.
+
+=item C<POSIX>
+
+Upgraded from version 1.13 to 1.17.
+
+=item C<Safe>
+
+Upgraded from 2.12 to 2.18.
+
+=item C<Scalar::Util>
+
+Upgraded from version 1.19 to 1.21.
+
+=item C<SelectSaver>
+
+Upgraded from 1.01 to 1.02.
+
+=item C<SelfLoader>
+
+Upgraded from 1.11 to 1.17.
+
+=item C<Socket>
+
+Upgraded from 1.80 to 1.84.
+
+As of 1.84, C<Socket> can now handle abstract namespace sockets on Linux.
+(see unix(7)).
+
+=item C<Storable>
+
+Upgraded from 2.18 to 2.20.
+
+=item C<Switch>
+
+Upgraded from version 2.13 to 2.14. Please see L</Deprecations>.
+
+=item C<Symbol>
+
+Upgraded from version 1.06 to 1.07.
+
+=item C<Sys::Syslog>
+
+Upgraded from version 0.22 to 0.27.
+
+=item C<Term::ANSIColor>
+
+Upgraded from version 1.12 to 2.01.
+
+=item C<Term::ReadLine>
+
+Upgraded from version 1.03 to 1.04.
+
+=item C<Term::UI>
+
+Upgraded from version 0.18 to 0.20.
+
+=item C<Test::Harness>
+
+Upgraded from version 2.64 to 3.17.
+
+Note that one side-effect of the 2.x to 3.x upgrade is that the
+experimental C<Test::Harness::Straps> module (and its supporting
+C<Assert>, C<Iterator>, C<Point> and C<Results> modules) have been
+removed. If you still need this, then they are available in the
+(unmaintained) C<Test-Harness-Straps> distribution on CPAN.
+
+=item C<Test::Simple>
+
+Upgraded from version 0.72 to 0.92.
+
+=item C<Text::ParseWords>
+
+Upgraded from version 3.26 to 3.27.
+
+=item C<Text::Tabs>
+
+Upgraded from version 2007.1117 to 2009.0305.
+
+=item C<Text::Wrap>
+
+Upgraded from version 2006.1117 to 2009.0305.
+
+=item C<Thread::Queue>
+
+Upgraded from version 2.00 to 2.11.
+
+=item C<Thread::Semaphore>
+
+Upgraded from version 2.01 to 2.09.
+
+=item C<threads>
+
+Upgraded from version 1.67 to 1.73.
+
+=item C<threads::shared>
+
+Upgraded from version 1.14 to 1.29.
+
+=item C<Tie::RefHash>
+
+Upgraded from version 1.37 to 1.38.
+
+=item C<Tie::StdHandle>
+
+This has documentation changes, and has been assigned a version for the
+first time: version 4.2.
+
+=item C<Time::HiRes>
+
+Upgraded from version 1.9711 to 1.9719.
+
+=item C<Time::Local>
+
+Upgraded from version 1.18 to 1.1901.
+
+=item C<Time::Piece>
+
+Upgraded from version 1.12 to 1.15.
+
+=item C<Unicode::Normalize>
+
+Upgraded from version 1.02 to 1.03.
+
+=item C<Unicode::UCD>
+
+Upgraded from version 0.25 to 0.27.
+
+C<charinfo()> now works on Unified CJK code points added to later versions
+of Unicode.
+
+C<casefold()> has new fields returned to provide both a simpler interface
+and previously missing information. The old fields are retained for
+backwards compatibility. Information about Turkic-specific code points is
+now returned.
+
+The documentation has been corrected and expanded.
+
+=item C<UNIVERSAL>
+
+Upgraded from version 1.04 to 1.05.
+
+C<< UNIVERSAL->import() >> is now deprecated.
+
+=item C<Win32>
+
+Upgraded from version 0.34 to 0.39.
+
+=item C<Win32API::File>
+
+Upgraded from version 0.1001_01 to 0.1101.
+
+=item C<XSLoader>
+
+Upgraded from version 0.08 to 0.10.
+
+=item Upgrade to Class::ISA 0.34
+
+=item Upgrade to Attribute::Handlers 0.87
+
+=item Upgrade to AutoLoader 5.70
+
+=item Upgrade to IO::Zlib 1.10
+
+=item Update parent to CPAN version 0.223
+
+=item Update Log::Message::Simple to CPAN version 0.06
+
+=item Updated Math::BigRat to CPAN version 0.24
+
+=item Update Archive::Tar to CPAN version 1.54
+
+=item Update IPC::Cmd to CPAN version 0.50
+
+=item Updated CPANPLUS::Dist::Build to CPAN version 0.40
+
+=item Updated Module::Loaded to CPAN version 0.06
+
+=item Upgrade Term::ANSIColor to 2.02
+
+=item Update Text::Balanced to 2.02
+
+=item Update Module::Build to 0.35
+
+=item constant has been upgraded to 1.19.
+
+=item upgrade CGI from 3.43 to 3.45
+
+=item bump Safe version to 2.18
+
+=item Upgrade to threads::shared 1.31
+
+=item Update threads to 1.74
+
+=item autodie 2.06_01
+
+=item Synchronize with CPAN's Attribute::Handlers 0.86
+
+=item Synchronize AutoLoader with CPAN's 5.69
+
+=item ExtUtils::MakeMaker 6.55_02
+
+=item Final release of version-0.77 for inclusion in 5.10.1
+
+=item Upgrade to Encode 2.37
+
+=back
+
+=head1 Utility Changes
+
+=over 4
+
+=item F<h2ph>
+
+Now looks in C<include-fixed> too, which is a recent addition to gcc's
+search path.
+
+=item F<h2xs>
+
+No longer incorrectly treats enum values like macros (Daniel Burr).
+
+Now handles C++ style constants (C<//>) properly in enums. (A patch from
+Rainer Weikusat was used; Daniel Burr also proposed a similar fix).
+
+=item F<perl5db.pl>
+
+C<LVALUE> subroutines now work under the debugger.
+
+The debugger now correctly handles proxy constant subroutines, and
+subroutine stubs.
+
+=item F<perlbug>
+
+F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out upstream bug
+tracker URLs.
+
+Where the user names a module that their bug report is about, and we know the
+URL for its upstream bug tracker, provide a message to the user explaining
+that the core copies the CPAN version directly, and provide the URL for
+reporting the bug directly to upstream.
+
+=item F<perlthanks>
+
+Perl 5.11.0 added a new utility F<perlthanks>, which is a variant of
+F<perlbug>, but for sending non-bug-reports to the authors and maintainers
+of Perl. Getting nothing but bug reports can become a bit demoralising:
+we'll see if this changes things.
+
+=back
+
+=head1 New Documentation
+
+=over 4
+
+=item L<perlhaiku>
+
+This contains instructions on how to build perl for the Haiku platform.
+
+=item L<perlmroapi>
+
+This describes the new interface for pluggable Method Resolution Orders.
+
+=item L<perlperf>
+
+This document, by Richard Foley, provides an introduction to the use of
+performance and optimization techniques which can be used with particular
+reference to perl programs.
+
+=item L<perlrepository>
+
+This describes how to access the perl source using the I<git> version
+control system.
+
+=item L<perlthanks>
+
+This describes the new F<perlthanks> utility.
+
+=back
+
+=head1 Changes to Existing Documentation
+
+The various large F<Changes*> files (which listed every change made to perl
+over the last 18 years) have been removed, and replaced by a small file,
+also called F<Changes>, which just explains how that same information may
+be extracted from the git version control system.
+
+The file F<Porting/patching.pod> has been deleted, as it mainly described
+interacting with the old Perforce-based repository, which is now obsolete.
+Information still relevant has been moved to L<perlrepository>.
+
+L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
+generated at build time, rather than being shipped as part of the release.
+
+=head2 Documented -X overloading.
+
+=head2 Documented that C<when()> treats specially most of the filetest operators
+
+=head2 Documented when as a syntax modifier
+
+=head2 Eliminated "Old Perl threads tutorial", which describes 5005 threads.
+
+pod/perlthrtut.pod is the same material reworked for ithreads.
+
+=head2 Correct previous documentation: v-strings are not deprecated
+
+With version objects, we need them to use MODULE VERSION syntax. This
+patch removes the deprecation note.
+
+=head1 Performance Enhancements
+
+=over 4
+
+=item *
+
+A new internal cache means that C<isa()> will often be faster.
+
+=item *
+
+The implementation of C<C3> Method Resolution Order has been optimised -
+linearisation for classes with single inheritance is 40% faster. Performance
+for multiple inheritance is unchanged.
+
+=item *
+
+Under C<use locale>, the locale-relevant information is now cached on
+read-only values, such as the list returned by C<keys %hash>. This makes
+operations such as C<sort keys %hash> in the scope of C<use locale> much
+faster.
+
+=item *
+
+Empty C<DESTROY> methods are no longer called.
+
+=item *
+
+Faster C<Perl_sv_utf8_upgrade()>
+
+=item *
+
+Speed up C<keys> on empty hash
+
+=back
+
+=head1 Installation and Configuration Improvements
+
+=head2 F<ext/> reorganisation
+
+The layout of directories in F<ext> has been revised. Specifically, all
+extensions are now flat, and at the top level, with C</> in pathnames
+replaced by C<->, so that F<ext/Data/Dumper/> is now F<ext/Data-Dumper/>,
+etc. The names of the extensions as specified to F<Configure>, and as
+reported by C<%Config::Config> under the keys C<dynamic_ext>,
+C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and
+still use C</>. Hence this change will not have any affect once perl is
+installed. C<Safe> has been split out from being part of C<Opcode>, and
+C<mro> is now an extension in its own right.
+
+Nearly all dual-life modules have been moved from F<lib> to F<ext>, and will
+now appear as known C<nonxs_ext>. This will made no difference to the
+structure of an installed perl, nor will the modules installed differ,
+unless you run F<Configure> with options to specify an exact list of
+extensions to build. In this case, you will rapidly become aware that you
+need to add to your list, because various modules needed to complete the
+build, such as C<ExtUtils::ParseXS>, have now become extensions, and
+without them the build will fail well before it attempts to run the
+regression tests.
+
+=head2 Configuration improvements
+
+If C<vendorlib> and C<vendorarch> are the same, then they are only added to
+C<@INC> once.
+
+C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if
+perl is built with C<-Dusedevel>.
+
+F<Configure> will enable use of C<-fstack-protector>, to provide protection
+against stack-smashing attacks, if the compiler supports it.
+
+F<Configure> will now determine the correct prototypes for re-entrant
+functions, and for C<gconvert>, if you are using a C++ compiler rather
+than a C compiler.
+
+On Unix, if you build from a tree containing a git repository, the
+configuration process will note the commit hash you have checked out, for
+display in the output of C<perl -v> and C<perl -V>. Unpushed local commits
+are automatically added to the list of local patches displayed by
+C<perl -V>.
+
+=head2 Compilation improvements
+
+As part of the flattening of F<ext>, all extensions on all platforms are
+built by F<make_ext.pl>. This replaces the Unix-specific
+F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific
+F<win32/buildext.pl>.
+
+=head2 Platform Specific Changes
+
+=over 4
+
+=item AIX
+
+Removed F<libbsd> for AIX 5L and 6.1. Only C<flock()> was used from F<libbsd>.
+
+Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an
+optional package with the AIX Toolbox. Unfortunately the 64 bit version
+is broken.
+
+Hints changes mean that AIX 4.2 should work again.
+
+=item Cygwin
+
+On Cygwin we now strip the last number from the DLL. This has been the
+behaviour in the cygwin.com build for years. The hints files have been
+updated.
+
+=item DomainOS
+
+Support for Apollo DomainOS was removed in Perl 5.11.0
+
+=item FreeBSD
+
+The hints files now identify the correct threading libraries on FreeBSD 7
+and later.
+
+=item Irix
+
+We now work around a bizarre preprocessor bug in the Irix 6.5 compiler:
+C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't.
+
+=item Haiku
+
+Patches from the Haiku maintainers have been merged in. Perl should now
+build on Haiku.
+
+=item MiNT
+
+Support for Atari MiNT was removed in Perl 5.11.0.
+
+=item MirOS BSD
+
+Perl should now build on MirOS BSD.
+
+=item NetBSD
+
+Hints now supports versions 5.*.
+
+=item Stratus VOS
+
+Various changes from Stratus have been merged in.
+
+=item Symbian
+
+There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK.
+
+=item Win32
+
+Improved message window handling means that C<alarm> and C<kill> messages
+will no longer be dropped under race conditions.
+
+=item VMS
+
+Reads from the in-memory temporary files of C<PerlIO::scalar> used to fail
+if C<$/> was set to a numeric reference (to indicate record-style reads).
+This is now fixed.
+
+VMS now supports C<getgrgid>.
+
+Many improvements and cleanups have been made to the VMS file name handling
+and conversion code.
+
+Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit
+status in a VMS condition value for better interaction with GNV's bash
+shell and other utilities that depend on POSIX exit values. See
+L<perlvms/"$?"> for details.
+
+C<File::Copy> now detects Unix compatibility mode on VMS.
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+C<-I> on shebang line now adds directories in front of @INC.
+as documented, and as does C<-I> when specified on the command-line.
+(Renée Bäcker)
+
+=item *
+
+C<kill> is now fatal when called on non-numeric process identifiers.
+Previously, an 'undef' process identifier would be interpreted as a request to
+kill process "0", which would terminate the current process group on POSIX
+systems. Since process identifiers are always integers, killing a non-numeric
+process is now fatal.
+
+=item *
+
+5.10.0 inadvertently disabled an optimisation, which caused a measurable
+performance drop in list assignment, such as is often used to assign
+function parameters from C<@_>. The optimisation has been re-instated, and
+the performance regression fixed.
+
+=item *
+
+Fixed memory leak on C<while (1) { map 1, 1 }> [RT #53038].
+
+=item *
+
+Some potential coredumps in PerlIO fixed [RT #57322,54828].
+
+=item *
+
+The debugger now works with lvalue subroutines.
+
+=item *
+
+The debugger's C<m> command was broken on modules that defined constants
+[RT #61222].
+
+=item *
+
+C<crypt> and string complement could return tainted values for untainted
+arguments [RT #59998].
+
+=item *
+
+The C<-i>I<.suffix> command-line switch now recreates the file using
+restricted permissions, before changing its mode to match the original
+file. This eliminates a potential race condition [RT #60904].
+
+=item *
+
+On some UNIX systems, the value in C<$?> would not have the top bit set
+(C<$? & 128>) even if the child core dumped.
+
+=item *
+
+Under some circumstances, C<$^R> could incorrectly become undefined
+[RT #57042].
+
+=item *
+
+In the XS API, various hash functions, when passed a pre-computed hash where
+the key is UTF-8, might result in an incorrect lookup.
+
+=item *
+
+XS code including F<XSUB.h> before F<perl.h> gave a compile-time error
+[RT #57176].
+
+=item *
+
+C<< $object->isa('Foo') >> would report false if the package C<Foo> didn't
+exist, even if the object's C<@ISA> contained C<Foo>.
+
+=item *
+
+Various bugs in the new-to 5.10.0 mro code, triggered by manipulating
+C<@ISA>, have been found and fixed.
+
+=item *
+
+Bitwise operations on references could crash the interpreter, e.g.
+C<$x=\$y; $x |= "foo"> [RT #54956].
+
+=item *
+
+Patterns including alternation might be sensitive to the internal UTF-8
+representation, e.g.
+
+ my $byte = chr(192);
+ my $utf8 = chr(192); utf8::upgrade($utf8);
+ $utf8 =~ /$byte|X}/i; # failed in 5.10.0
+
+=item *
+
+Within UTF8-encoded Perl source files (i.e. where C<use utf8> is in
+effect), double-quoted literal strings could be corrupted where a C<\xNN>,
+C<\0NNN> or C<\N{}> is followed by a literal character with ordinal value
+greater than 255 [RT #59908].
+
+=item *
+
+C<B::Deparse> failed to correctly deparse various constructs:
+C<readpipe STRING> [RT #62428], C<CORE::require(STRING)> [RT #62488],
+C<sub foo(_)> [RT #62484].
+
+=item *
+
+Using C<setpgrp> with no arguments could corrupt the perl stack.
+
+=item *
+
+The block form of C<eval> is now specifically trappable by C<Safe> and
+C<ops>. Previously it was erroneously treated like string C<eval>.
+
+=item *
+
+In 5.10.0, the two characters C<[~> were sometimes parsed as the smart
+match operator (C<~~>) [RT #63854].
+
+=item *
+
+In 5.10.0, the C<*> quantifier in patterns was sometimes treated as
+C<{0,32767}> [RT #60034, #60464]. For example, this match would fail:
+
+ ("ab" x 32768) =~ /^(ab)*$/
+
+=item *
+
+C<shmget> was limited to a 32 bit segment size on a 64 bit OS [RT #63924].
+
+=item *
+
+Using C<next> or C<last> to exit a C<given> block no longer produces a
+spurious warning like the following:
+
+ Exiting given via last at foo.pl line 123
+
+=item *
+
+On Windows, C<'.\foo'> and C<'..\foo'> were treated differently than
+C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492].
+
+=item *
+
+Assigning a format to a glob could corrupt the format; e.g.:
+
+ *bar=*foo{FORMAT}; # foo format now bad
+
+=item *
+
+Attempting to coerce a typeglob to a string or number could cause an
+assertion failure. The correct error message is now generated,
+C<Can't coerce GLOB to I<$type>>.
+
+=item *
+
+Under C<use filetest 'access'>, C<-x> was using the wrong access mode. This
+has been fixed [RT #49003].
+
+=item *
+
+C<length> on a tied scalar that returned a Unicode value would not be
+correct the first time. This has been fixed.
+
+=item *
+
+Using an array C<tie> inside in array C<tie> could SEGV. This has been
+fixed. [RT #51636]
+
+=item *
+
+A race condition inside C<PerlIOStdio_close()> has been identified and
+fixed. This used to cause various threading issues, including SEGVs.
+
+=item *
+
+In C<unpack>, the use of C<()> groups in scalar context was internally
+placing a list on the interpreter's stack, which manifested in various
+ways, including SEGVs. This is now fixed [RT #50256].
+
+=item *
+
+Magic was called twice in C<substr>, C<\&$x>, C<tie $x, $m> and C<chop>.
+These have all been fixed.
+
+=item *
+
+A 5.10.0 optimisation to clear the temporary stack within the implicit
+loop of C<s///ge> has been reverted, as it turned out to be the cause of
+obscure bugs in seemingly unrelated parts of the interpreter [commit
+ef0d4e17921ee3de].
+
+=item *
+
+The line numbers for warnings inside C<elsif> are now correct.
+
+=item *
+
+The C<..> operator now works correctly with ranges whose ends are at or
+close to the values of the smallest and largest integers.
+
+=item *
+
+C<binmode STDIN, ':raw'> could lead to segmentation faults on some platforms.
+This has been fixed [RT #54828].
+
+=item *
+
+An off-by-one error meant that C<index $str, ...> was effectively being
+executed as C<index "$str\0", ...>. This has been fixed [RT #53746].
+
+=item *
+
+Various leaks associated with named captures in regexes have been fixed
+[RT #57024].
+
+=item *
+
+A weak reference to a hash would leak. This was affecting C<DBI>
+[RT #56908].
+
+=item *
+
+Using (?|) in a regex could cause a segfault [RT #59734].
+
+=item *
+
+Use of a UTF-8 C<tr//> within a closure could cause a segfault [RT #61520].
+
+=item *
+
+Calling C<Perl_sv_chop()> or otherwise upgrading an SV could result in an
+unaligned 64-bit access on the SPARC architecture [RT #60574].
+
+=item *
+
+In the 5.10.0 release, C<inc_version_list> would incorrectly list
+C<5.10.*> after C<5.8.*>; this affected the C<@INC> search order
+[RT #67628].
+
+=item *
+
+In 5.10.0, C<pack "a*", $tainted_value> returned a non-tainted value
+[RT #52552].
+
+=item *
+
+In 5.10.0, C<printf> and C<sprintf> could produce the fatal error
+C<panic: utf8_mg_pos_cache_update> when printing UTF-8 strings
+[RT #62666].
+
+=item *
+
+In the 5.10.0 release, a dynamically created C<AUTOLOAD> method might be
+missed (method cache issue) [RT #60220,60232].
+
+=item *
+
+In the 5.10.0 release, a combination of C<use feature> and C<//ee> could
+cause a memory leak [RT #63110].
+
+=item *
+
+C<-C> on the shebang (C<#!>) line is once more permitted if it is also
+specified on the command line. C<-C> on the shebang line used to be a
+silent no-op I<if> it was not also on the command line, so perl 5.10.0
+disallowed it, which broke some scripts. Now perl checks whether it is
+also on the command line and only dies if it is not [RT #67880].
+
+=item *
+
+In 5.10.0, certain types of re-entrant regular expression could crash,
+or cause the following assertion failure [RT #60508]:
+
+ Assertion rx->sublen >= (s - rx->subbeg) + i failed
+
+=back
+
+=head1 New or Changed Diagnostics
+
+=over 4
+
+=item C<panic: sv_chop %s>
+
+This new fatal error occurs when the C routine C<Perl_sv_chop()> was
+passed a position that is not within the scalar's string buffer. This
+could be caused by buggy XS code, and at this point recovery is not
+possible.
+
+=item C<Can't locate package %s for the parents of %s>
+
+This warning has been removed. In general, it only got produced in
+conjunction with other warnings, and removing it allowed an ISA lookup
+optimisation to be added.
+
+=item C<v-string in use/require is non-portable>
+
+This warning has been removed.
+
+=item C<Deep recursion on subroutine "%s">
+
+It is now possible to change the depth threshold for this warning from the
+default of 100, by recompiling the F<perl> binary, setting the C
+pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
+
+=back
+
+=head1 Changed Internals
+
+=over 4
+
+=item *
+
+The J.R.R. Tolkien quotes at the head of C source file have been checked and
+proper citations added, thanks to a patch from Tom Christiansen.
+
+=item *
+
+C<Perl_vcroak()> now accepts a null first argument. In addition, a full audit
+was made of the "not NULL" compiler annotations, and those for several
+other internal functions were corrected.
+
+=item *
+
+New macros C<dSAVEDERRNO>, C<dSAVE_ERRNO>, C<SAVE_ERRNO>, C<RESTORE_ERRNO>
+have been added to formalise the temporary saving of the C<errno>
+variable.
+
+=item *
+
+The function C<Perl_sv_insert_flags> has been added to augment
+C<Perl_sv_insert>.
+
+=item *
+
+The function C<Perl_newSV_type(type)> has been added, equivalent to
+C<Perl_newSV()> followed by C<Perl_sv_upgrade(type)>.
+
+=item *
+
+The function C<Perl_newSVpvn_flags()> has been added, equivalent to
+C<Perl_newSVpvn()> and then performing the action relevant to the flag.
+
+Two flag bits are currently supported.
+
+=over 4
+
+=item C<SVf_UTF8>
+
+This will call C<SvUTF8_on()> for you. (Note that this does not convert an
+sequence of ISO 8859-1 characters to UTF-8). A wrapper, C<newSVpvn_utf8()>
+is available for this.
+
+=item C<SVs_TEMP>
+
+Call C<Perl_sv_2mortal()> on the new SV.
+
+=back
+
+There is also a wrapper that takes constant strings, C<newSVpvs_flags()>.
+
+=item *
+
+The function C<Perl_croak_xs_usage> has been added as a wrapper to
+C<Perl_croak>.
+
+=item *
+
+The functions C<PerlIO_find_layer> and C<PerlIO_list_alloc> are now
+exported.
+
+=item *
+
+C<PL_na> has been exterminated from the core code, replaced by local STRLEN
+temporaries, or C<*_nolen()> calls. Either approach is faster than C<PL_na>,
+which is a pointer deference into the interpreter structure under ithreads,
+and a global variable otherwise.
+
+=item *
+
+C<Perl_mg_free()> used to leave freed memory accessible via C<SvMAGIC()> on
+the scalar. It now updates the linked list to remove each piece of magic
+as it is freed.
+
+=item *
+
+Under ithreads, the regex in C<PL_reg_curpm> is now reference counted. This
+eliminates a lot of hackish workarounds to cope with it not being reference
+counted.
+
+=item *
+
+C<Perl_mg_magical()> would sometimes incorrectly turn on C<SvRMAGICAL()>.
+This has been fixed.
+
+=item *
+
+The I<public> IV and NV flags are now not set if the string value has
+trailing "garbage". This behaviour is consistent with not setting the
+public IV or NV flags if the value is out of range for the type.
+
+=item *
+
+SV allocation tracing has been added to the diagnostics enabled by C<-Dm>.
+The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if
+that was enabled when the F<perl> binary was compiled.
+
+=item *
+
+Smartmatch resolution tracing has been added as a new diagnostic. Use C<-DM> to
+enable it.
+
+=item *
+
+Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been
+replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL>
+is clearer to those unfamiliar with the core code.
+
+=item *
+
+A macro C<MUTABLE_PTR(p)> has been added, which on (non-pedantic) gcc will
+not cast away C<const>, returning a C<void *>. Macros C<MUTABLE_SV(av)>,
+C<MUTABLE_SV(cv)> etc build on this, casting to C<AV *> etc without
+casting away C<const>. This allows proper compile-time auditing of
+C<const> correctness in the core, and helped picked up some errors (now
+fixed).
+
+=item *
+
+Macros C<mPUSHs()> and C<mXPUSHs()> have been added, for pushing SVs on the
+stack and mortalizing them.
+
+=item *
+
+Use of the private structure C<mro_meta> has changed slightly. Nothing
+outside the core should be accessing this directly anyway.
+
+=item *
+
+A new tool, F<Porting/expand-macro.pl> has been added, that allows you
+to view how a C preprocessor macro would be expanded when compiled.
+This is handy when trying to decode the macro hell that is the perl
+guts.
+
+=back
+
+=head1 New Tests
+
+Many modules updated from CPAN incorporate new tests.
+
+Several tests that have the potential to hang forever if they fail now
+incorporate a "watchdog" functionality that will kill them after a timeout,
+which helps ensure that C<make test> and C<make test_harness> run to
+completion automatically. (Jerry Hedden).
+
+Some core-specific tests have been added:
+
+=over 4
+
+=item t/comp/retainedlines.t
+
+Check that the debugger can retain source lines from C<eval>.
+
+=item t/io/perlio_fail.t
+
+Check that bad layers fail.
+
+=item t/io/perlio_leaks.t
+
+Check that PerlIO layers are not leaking.
+
+=item t/io/perlio_open.t
+
+Check that certain special forms of open work.
+
+=item t/io/perlio.t
+
+General PerlIO tests.
+
+=item t/io/pvbm.t
+
+Check that there is no unexpected interaction between the internal types
+C<PVBM> and C<PVGV>.
+
+=item t/mro/package_aliases.t
+
+Check that mro works properly in the presence of aliased packages.
+
+=item t/op/dbm.t
+
+Tests for C<dbmopen> and C<dbmclose>.
+
+=item t/op/index_thr.t
+
+Tests for the interaction of C<index> and threads.
+
+=item t/op/pat_thr.t
+
+Tests for the interaction of esoteric patterns and threads.
+
+=item t/op/qr_gc.t
+
+Test that C<qr> doesn't leak.
+
+=item t/op/reg_email_thr.t
+
+Tests for the interaction of regex recursion and threads.
+
+=item t/op/regexp_qr_embed_thr.t
+
+Tests for the interaction of patterns with embedded C<qr//> and threads.
+
+=item t/op/regexp_unicode_prop.t
+
+Tests for Unicode properties in regular expressions.
+
+=item t/op/regexp_unicode_prop_thr.t
+
+Tests for the interaction of Unicode properties and threads.
+
+=item t/op/reg_nc_tie.t
+
+Test the tied methods of C<Tie::Hash::NamedCapture>.
+
+=item t/op/reg_posixcc.t
+
+Check that POSIX character classes behave consistently.
+
+=item t/op/re.t
+
+Check that exportable C<re> functions in F<universal.c> work.
+
+=item t/op/setpgrpstack.t
+
+Check that C<setpgrp> works.
+
+=item t/op/substr_thr.t
+
+Tests for the interaction of C<substr> and threads.
+
+=item t/op/upgrade.t
+
+Check that upgrading and assigning scalars works.
+
+=item t/uni/lex_utf8.t
+
+Check that Unicode in the lexer works.
+
+=item t/uni/tie.t
+
+Check that Unicode and C<tie> work.
+
+=back
+
+=head1 Known Problems
+
+This is a list of some significant unfixed bugs, which are regressions
+from either 5.10.0 or 5.8.x.
+
+=over 4
+
+=item *
+
+C<List::Util::first> misbehaves in the presence of a lexical C<$_>
+(typically introduced by C<my $_> or implicitly by C<given>). The variable
+which gets set for each iteration is the package variable C<$_>, not the
+lexical C<$_> [RT #67694].
+
+A similar issue may occur in other modules that provide functions which
+take a block as their first argument, like
+
+ foo { ... $_ ...} list
+
+=item *
+
+The C<charnames> pragma may generate a run-time error when a regex is
+interpolated [RT #56444]:
+
+ use charnames ':full';
+ my $r1 = qr/\N{THAI CHARACTER SARA I}/;
+ "foo" =~ $r1; # okay
+ "foo" =~ /$r1+/; # runtime error
+
+A workaround is to generate the character outside of the regex:
+
+ my $a = "\N{THAI CHARACTER SARA I}";
+ my $r1 = qr/$a/;
+
+=item *
+
+Some regexes may run much more slowly when run in a child thread compared
+with the thread the pattern was compiled into [RT #55600].
+
+=back
+
+=head1 Deprecations
+
+The following items are now deprecated.
+
+=over 4
+
+=item *
+
+C<Switch> is buggy and should be avoided. From perl 5.11.0 onwards, it is
+intended that any use of the core version of this module will emit a
+warning, and that the module will eventually be removed from the core
+(probably in perl 5.14.0). See L<perlsyn/"Switch statements"> for its
+replacement.
+
+=item *
+
+The following modules will be removed from the core distribution in a future
+release, and should be installed from CPAN instead. Distributions on CPAN
+which require these should add them to their prerequisites. The core versions
+of these modules warnings will issue a deprecation warning.
+
+=over
+
+=item *
+
+C<Pod::Plainer>
+
+=back
+
+=item *
+
+C<suidperl> has been removed. It used to provide a mechanism to
+emulate setuid permission bits on systems that don't support it properly.
+
+=item *
+
+Deprecate assignment to $[
+
+=item *
+
+Remove attrs, which has been deprecated since 1999/10/02.
+
+=item *
+
+Deprecate use of the attribute :locked on subroutines.
+
+=item *
+
+Deprecate using "locked" with the attributes pragma.
+
+=item *
+
+Deprecate using "unique" with the attributes pragma.
+
+=item *
+
+warn if ++ or -- are unable to change the value because it's beyond the limit of representation
+
+This uses a new warnings category: "imprecision".
+
+=item *
+
+Make lc/uc/lcfirst/ucfirst warn when passed undef.
+
+=item *
+
+Show constant in "Useless use of a constant in void context"
+
+=item *
+
+Make the new warning report undef constants as undef
+
+=item *
+
+Add a new warning, "Prototype after '%s'"
+
+=item *
+
+Tweak the "Illegal character in prototype" warning so it's more precise when reporting illegal characters after _
+
+=item *
+
+Unintented interpolation of $\ in regex
+
+=item *
+
+Make overflow warnings in gmtime/localtime only occur when warnings are on
+
+=item *
+
+Improve mro merging error messages.
+
+They are now very similar to those produced by Algorithm::C3.
+
+=item *
+
+Amelioration of the error message "Unrecognized character %s in column %d"
+
+Changes the error message to "Unrecognized character %s; marked by <--
+HERE after %s<-- HERE near column %d". This should make it a little
+simpler to spot and correct the suspicious character.
+
+=item *
+
+Explicitely point to $. when it causes an uninitialized warning for ranges in scalar context
+
+=item *
+
+Removed vestigal support for Tenon Intersystems MachTen Unix layer for MacOS Classic.
+
+=item *
+
+Removed the port to Atari MiNT. It's a dead platform that hasn't had any love since 5.005.
+
+
+=item *
+
+Deprecated numerous Perl 4-era libraries:
+
+F<termcap.pl>, F<tainted.pl>, F<stat.pl>, F<shellwords.pl>, F<pwd.pl>,
+F<open3.pl>, F<open2.pl>, F<newgetopt.pl>, F<look.pl>, F<find.pl>,
+F<finddepth.pl>, F<importenv.pl>, F<hostname.pl>, F<getopts.pl>,
+F<getopt.pl>, F<getcwd.pl>, F<flush.pl>, F<fastcwd.pl>, F<exceptions.pl>,
+F<ctime.pl>, F<complete.pl>, F<cacheout.pl>, F<bigrat.pl>, F<bigint.pl>,
+F<bigfloat.pl>, F<assert.pl>, F<abbrev.pl>, F<dotsh.pl>, and
+F<timelocal.pl> are all now deprecated. Using them will incur a warning.
+
+=back
+
+=head1 Acknowledgements
+
+Some of the work in this release was funded by a TPF grant funded by
+Dijkmat BV, The Netherlands.
+
+Steffen Mueller and David Golden in particular helped getting CPAN modules
+polished and synchronised with their in-core equivalents.
+
+Craig Berry was tireless in getting maint to run under VMS, no matter how
+many times we broke it for him.
+
+The other core committers contributed most of the changes, and applied most
+of the patches sent in by the hundreds of contributors listed in F<AUTHORS>.
+
+Much of the work of categorizing changes in this perldelta file was contributed
+by the following porters using changelogger.bestpractical.com:
+
+Nicholas Clark, leon, shawn, alexm, rjbs, rafl, Pedro Melo, brunorc,
+anonymous, ☄, Tom Hukins, anonymous, Jesse, dagolden, Moritz Onken,
+Mark Fowler, chorny, anonymous, tmtm
+
+Finally, thanks to Larry Wall, without whom none of this would be
+necessary.
+
+=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 B<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 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
+
+
+=head1 TODO
+
+The following changes are a filtered list of changes which weren't backported
+to 5.10.1. They were run through changelogger.bestpractical.com and triaged
+by a set of Perl 5 Porters. Changes to blead after
+fafe5ad5a7e57ca14cd0844db173f3a4d6c9e8de
+
+have not yet been triaged or integrated.
+
+The following changes need to be
+
+1) deleted if they don't merit inclusion
+
+ OR
+
+2) lightly copyedited and integrated into the perldelta above. Unfortunately, many of our
+commit messages are somewhat terse and require a bit more help to turn into something readable
+
+
+
+
+=head1 API
+
+=head2 Move the reg_stringify logic to Perl_sv_2pv_flags
+
+=head2 mg_copy ought to take an I32
+
+=head2 Perl_store_cop_label() isn't meant to be part of the public API.
+
+=head2 Perl_gv_fetchmethod{,_autoload,_flags} are actually never* called with a non-NULL stash.
+So change the parameter to NN.
+
+
+=head2 Promote Perl_setdefout() to the public API.
+
+=head2 Add get_cvs() as a shortcut for STR_WITH_LEN() and Perl_get_cvn_flags()
+
+=head2 In Perl_newCONSTSUB(), sv should not be NULL.
+
+=head2 GvUNIQUE* have been defined as 0 since 2005/06/30 - high time to remove them.
+
+=head2 invert and rename PERL_MEM_LOG_STDERR to PERL_MEM_LOG_NOIMPL
+
+Most users who want PERL_MEM_LOG want the default implementation,
+give it to them. Users providing their own implementation can
+obtain current behavior by adding -DPERL_MEM_LOG_NOIMPL.
+Frankly, the average user probably wants _ENV by default too.
+
+=head2 simplify PERL_MEM_LOG
+
+This combines multiple environment variable reads into 1,
+where it looks for values like "2mst"
+-2 leading digits are atoi()d to get FD
+-m memory logging please
+-s sv logging also
+-t timestamp those please.
+
+Combining these reduces overhead such that it seemed
+worthwhile to drop all the ifdefs. TBD whether this works
+in the environment that drove the original tradeoffs.
+
+If it isnt enough, Id be tempted by a global static ptr,
+and on 1st use, is read, seen 0, a lock is taken, and getenvar
+run to populate it, unlocked, proceed. This would remove
+iterative overheads.
+
+=head2 Add a parameter "destructing" to Gv_AMupdate()
+
+This boolean parameter indicates if the function has been called
+to update the overload magic table while looking up the DESTROY
+method. In this case, it's probably best to avoid croaking if
+those tables could not be updated (for example due to a method
+that could not be loaded.)
+
+=head2 Modify the return value of Gv_AMupdate to indicate a compilation error
+
+This way we'll restore most of the performance on object destruction
+lost by the previous commit
+
+
+=head2 local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
+
+Re: [perl #60360] [PATCH] UPDATED: local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
+Message-ID: <20081112234504.GI2062@tytlal.topaz.cx>
+
+Updated patch to retain source compatibility.
+
+Plus using the correct PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS
+macro and running make regen.
+
+=head2 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
+
+Respecting inc_version_list while processing PERL_VENDORLIB_STEM
+From: "Mandalemula, Rajesh" <Rajesh.Mandalemula@deshaw.com>
+
+=head2 Change PL_debug behaviour
+
+
+String eval lines are now saved whenever
+a subroutine is defined, even if the eval'd string has subsequent
+syntax errors. This allows the debugger to single step into these
+subroutines.
+
+
+=head2 Tied filehandles now have an additional method EOF which provides the EOF type
+
+=head2 Perl is now smarter about adding a -I dir to the beginning or end of @INC
+
+=head2 On scope end, delete localized array elements that should not exist anymore, so that the array recovers its previous length. Honour EXISTS and DELETE for tied arrays.
+
+=head2 When a glob is deleted, mark its sub as ANON.
+
+=head2 Require a space or a newline after a "#line XXX" directive
+
+=head2 Forbid using "foreach" as an attribute
+
+(like all other control flow statements)
+
+
+=head2 Unregister signal handlers before destroying my_perl
+
+If the signal handler runs after perl_destruct() has been called, it
+will get an invalid (or NULL) my_perl when it asks for the
+thread-specific interpreter struct. This patch resets the signal
+handler for any signal previously handled by PL_csighandlerp to SIG_DFL
+before calling perl_destruct().
+
+=head2 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
+
+Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
+instead of the now-removed INT handler.
+
+=head2 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
+
+[perl #66452] TMPDIR not honored when opening an anonymous temporary file
+
+=head2 The attached patch to perlio.c fixes the problem of errno getting set.
+
+While I am firmly in the school of "do not look at $! except immediately
+after a failure", I also agree that spuriously setting it is messy. But
+there is just no way of knowing where your errno might have been.
+
+The problem was that PerlIO_fast_gets() (and other nearby similar
+capability-checking PerlIO routines) set the errno (and it was being
+called a lot, from sv_gets()). I think setting the errno here was
+a mistake: checking for "can has FOO" should not set external state,
+such as the errno. The patch removes that errno trashing from all those
+routines.
+
+=head2 Trim all trailing / from "." in @INC when filling %INC
+
+This fixes bug #66942 : as a / was left in the directory name,
+$INC{"Foo.pm"} for a file loaded from the current directory
+was given the incorrect value "/Foo.pm".
+
+=head2 Don't enqueue pending signals during global destruction
+
+Global destruction is not signal-safe. PL_psig_pend may already
+be gone when the signal handler is called (with destruct_level > 0).
+NULL it before freeing it to prevent a race condition.
+
+=head2 Eliminate struct regexp_allocated and xpvio_allocated.
+
+Calculate memory allocation using regexp and XPVIO, and the offset of the first
+real structure member. This avoids tripping over alignment differences between
+X* and x*_allocated, because x*_allocated doesn't have a double in it.
+
+
+=head1 internals
+
+=head2 [perl #47047] Use of inherited AUTOLOAD for non-method is deprecated
+
+=head2 Remove the definitions of Null(), Nullch, Nullfp, Nullsv and PL_na when code is within the perl source tree
+
+=head2 Replace our assert-which-can-be-caught-by-eval with the real deal from the standard C library.
+
+=head2 Tweak Perl_sv_upgrade() so that references can upgrade to SVt_PV
+
+=head2 Eliminate prelen from struct regexp.
+
+=head2 Change Perl_av_iter_p() to return IV* rather than I32* (which means
+
+=head2 Reorder the external regexp flags to get RXf_PMf_STD_PMMOD into the
+
+lowest 4 bits (which saves a shift), and the "flags indicating special
+patterns" into contiguous bits. This makes everything a little tidier,
+and saves 88 bytes (woohoo!) of object file with -Os on x86 FreeBSD.
+
+
+=head2 Re-implement the SvOOK() hack to store the offset as a BER encoded number in the part of the PVX that is being released.
+(It will always
+fit, as chopping off 1 byte gives just enough space for recording a
+delta of up to 127). This allows SvOOK() to co-exist with SvIOK_on(),
+which means all the calls to SvOOK_off() [with the possibility of a
+call to sv_backoff()] in SvIOK_on() can be removed. This ought to make
+a lot of straight line code a little bit simpler.
+OOK()d scalars can now be SVt_PV, as the IVX isn't needed.
+
+=head2 Abolish wraplen from struct regexp. We're already storing it in SvCUR.
+
+=head2 Make Perl_pregcomp() use SvUTF8() of the pattern, rather than the flag bit in pmflags, to decide whether the pattern is UTF-8.
+
+=head2 Abolish RXf_UTF8. Store the UTF-8-ness of the pattern with SvUTF8().
+
+=head2 In struct regexp move the member paren_names to the IV union.
+
+=head2 Make REGEXP a type distinct from SV. (Much like AV, CV, GV, HV).
+
+=head2 Allow sv_setsv_flags() to copy SVt_REGEXP much like it copies SVt_FORMAT - the just string buffer.
+
+
+=head2 Correct a long-standing ithreads reference counting anonmaly
+
+The reference count only needs "doubling" when the scalar is pushed onto
+PL_regex_padav for the second time.
+
+
+=head2 In PL_regexp_padav, store regexps via real references, rather than hiding them within IVs.
+
+We can do this now that they are real SV pointers.
+
+=head2 With regexps stored as real RVs, we can eliminate SvREPADTMP().
+
+=head2 REGEXPs are now stored directly in PL_regex_padav, rather than indirectly via RVs.
+
+=head2 Remove code that protected pp_qr against REGEXPs going away during global destruction whilst they were stored via true references in PL_regex_padav.
+
+=head2 Remove PM_GETRE_SAFE and PM_SETRE_SAFE as nothing uses them.
+
+=head2 Note the U8 sized space created by removing -P, and check that it is now an illegal command line flag.
+
+=head2 Pack the recycled pad offsets into an SV at PL_regex_pad[0].
+
+=head2 Re-order so that the !SvOK() case is last (which should be rare)
+
+=head2 Extend PUSHFORMAT() to take a second parameter to set retop, to save NULLing it and then reassigning.
+
+=head2 Split struct block_sub into struct block_sub and struct block_format.
+
+Split struct block_sub into struct block_sub and struct block_format.
+(CXt_SUB and CXt_FORMAT were using some comon members, but some members
+were only for one or the other.)
+
+=head2 Change the wantarray result from caller from IV to bool for the SCALAR/ARRAY case.
+
+This doesn't contradict the documentation, as there isn't any. Oops.
+
+
+=head2 Give G_VOID, G_SCALAR and G_ARRAY the same numeric values as OPf_WANT_VOID, OPf_WANT_SCALAR and OPf_WANT_LIST.
+
+
+=head2 Squeeze the context type down to 4 bits, and move the private flags to fit within the next 4 bits.
+
+
+=head2 In struct block change blku_type from U8 to U16, and the "spare" U8 to U16, with the lockstep changes in struct subst.
+Eliminate lval from
+struct block_sub, and instead store it in the U16 in struct block.
+
+
+=head2 In struct block_eval, eliminate old_in_eval and old_op_type by storing the data in blk_u16.
+
+
+=head2 The layout for struct block_loop under ithreads can be simplified.
+
+Instead of wedging the pad offset into a void* iterdata, and always
+storing PL_comppad even when it isn't used, instead do this:
+
+ PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
+ /* This is also accessible via cx->blk_loop.my_op->op_targ */
+ PADOFFSET targoffset;
+
+and store the GV pointer in oldcompad. Pointers to pointers seems
+cleaner. This also allows us to eliminate the flag bit CXp_PADVAR.
+
+
+=head2 In XS_PerlIO_get_layers() take advantage of the implementation of
+
+In XS_PerlIO_get_layers() take advantage of the implementation of
+PerlIO_get_layers(), by co-opting the new SVs it creates, rather than
+copying them.
+
+
+=head2 Micro-optimise the order of the context types. [Because I can :-)]
+
+=head2 [patch] optimize OP_IS_(FILETEST|SOCKET) macros
+
+=head2 Eliminate ck_lengthconst.
+
+=head2 Chainsaw DEBUG_S out, as suggested by Vincent Pit.
+
+=head2 Unsupported private API functions are now declared "static" to prevent leakage to the public API
+
+=head2 Perl_cv_ckproto() is not part of the public API, and not used anywhere. It has been removed
+
+=head2 Remove all the 5005threads specific mutex macros, which are now vestigial.
+
+=head2 Do not honor TMPDIR for anonymous temporary files when tainting
+
+Use a default of /tmp on Unixes when TMPDIR is unset or empty, or
+when creation of a temporary file in it fails
+
+=head2 Add a pluggable hook in op_free()
+
+
+
+
+=head2 Dual-lifed modules moved
+
+Dual-lifed modules maintained primarily in the Perl core now live in ext/.
+Dual-lifed modules maintained primarily on CPAN now live in cpan/
+
+=head2 MAD now builds on C++
+
+ Fix building MAD with C++ - a MAD_PV of "" is illegal, as it will be free()d.
+
+commit 4e73d6a402bc493d66d19c409c41e1e271c6450b
+Author: Nicholas Clark <nick@ccl4.org>
+Date: Wed Sep 23 11:59:31 2009 +0100
+
+ Add a --chdir option to configpm, and use this in the Win32 Makfiles.
+
+ A slight Makefile simplification, and another move towards Win32 standardising
+ on running miniperl as $(MINIPERL), which currently is ..\miniperl.exe
+
+
+=head2 miniperl no longer builds with UTF-8 support in the regexp engine to support the bootstrapping process
+
+ This allows a build to complete with PERL_UNICODE set and a UTF-8 locale.
+ Without this there's a bootstrapping problem, as miniperl can't load the UTF-8
+ components of the regexp engine, because they're not yet built.
+
+=head2 miniperl now has a restricted @INC
+
+ Restrict miniperl to just -I..., the split of $ENV{PERL5LIB}, and "." in @INC
+
+=head2 miniperl now identifies itself in the output of miniperl -V
+
+PERL_IS_MINIPERL is now declared in the verbose configuration output.
+
+=head2 Parallel testing is pretty much done.
+
+commit d8723a6a74b2c12e9d732728dbe717672ab893f2
+Author: Salvador Ortiz Garcia <sog@msg.com.mx>
+Date: Sun Sep 6 23:41:57 2009 +0200
+
+ Corrupt filename when setting %INC entry in a @INC hook
+
+ The code in pp_ctl.c after calling an @INC hook blindly assumes that the
+ SV setted by the user in %INC is an SVPV (SvPOK true) for setting the
+ filename. So when the user uses other scalar types, the output of
+ __FILE__, warn, die, caller, etc. shows random garbage.
+
+Author: Zefram <zefram@fysh.org>
+Date: Sun Sep 6 17:29:43 2009 +0200
+
+ Fix [perl #66970] Incorrect coderef in MODIFY_CODE_ATTRIBUTES
+
+ Attribute handlers being applied to a temporary CV has actually been
+ reported as a bug, #66970. The attached patch fixes the bug, by
+ changing the order in which things happen: attributes are now applied
+ after the temporary CV has been merged into the existing CV or has
+ otherwise been added to the appropriate GV.
+
+ The change breaks part of Attribute::Handlers. Part of A:H searches the
+ package to find the name of the sub to which a :ATTR attribute is being
+ applied, and the correct time at which to launch that search depends
+ crucially on the order in which the CV construction events occur. So
+ this patch also includes a change to A:H, to make it detect which way
+ things happen. The resulting A:H works either way, which is essential
+ for its dual-life nature.
+
+commit 354c724e8ab74f150e14800acc80d505949161f5
+Author: Nicholas Clark <nick@ccl4.org>
+Date: Fri Sep 4 11:04:30 2009 +0100
+
+ OS/2 hadn't been updated to cope with the ext/ restructuring.
+
+ I don't have OS/2, so I can't test this, but the code in Configure will assume
+ flat directories, because ext/File-Glob is present, and hence not search
+ recursively and not find the OS/2 extensions if they are copied into ext/OS2/*
+
+ I believe that without this change OS/2 will not have been building since the
+ change to flattened ext. This change may not be sufficient to get OS/2
+ building again, but it is in the right direction.
+
+commit bf6bfb44d9f2e07e4bd25b8eba2d9132fcec637e
+Author: Abhijit Menon-Sen <ams@toroid.org>
+Date: Fri Sep 4 12:41:56 2009 +0530
+
+ Entity-encode E<0xNNNN> and E<0NNN> correctly
+
+ Fixes bug #68964 reported by samv, where pod2html encoded E<0x2070> to
+ &0x2070 and not ⁰. perlpodspec says E<0x2070> should work, but the
+ code in Pod::Html accepted only E<x2070>. The new code accepts both, and
+ processes octal entities correctly as well.
+
+ Signed-off-by: Abhijit Menon-Sen <ams@toroid.org>
+
+commit 61131c9411631986e27506a8a66b4d43f2f3e4e0
+Author: Karl Williamson <khw@khw-desktop.(none)>
+Date: Thu Sep 3 11:29:30 2009 -0600
+
+ Add missing files from Unicode 5.1 Character Database
+
+
+=head2 set PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS to 0 and enable proper POSIX char class matching
+
+ This also alters which Unicode properties that the POSIX character
+ class and the Perl "special" character classes, like \w and \d map
+ to. At the same time it allows a number of tests for POSIX character
+ class behaviour to be switched from todo to non todo. Legacy testing
+ is still available by changing the define and setting the
+ PERL_TEST_LEGACY_POSIX_CC value to true.
+
+
+commit 89904c08923161afd23c629d5c2c7472a09c16bb
+Author: Lubomir Rintel <lkundrak@v3.sk>
+Date: Mon Aug 31 11:45:23 2009 +0200
+
+ Fix unpack of abstract socket addrs with nul byte
+
+ Addresses of Linux abstract namespace sockets are not nul-terminated C
+ strings, but rather an arbitrary character arrays. According to unix(7)
+ documentation from Linux, "Null bytes in the name have no special
+ significance."
+
+ unpack_sockaddr_un() was just throwing the initial nul byte away and
+ then treating the rest like ordinary C string when computing the length
+ of the address, which was wrong. This fix utilizes the length of the PV
+ for addresses starting with nul instead.
+
+ The regression test was extended with check for the problem.
+
+
+commit 16fa5c119c4bda5c0396a5f81296bd1ccc128a9c
+Author: Vincent Pit <perl@profvince.com>
+Date: Thu Aug 27 11:13:09 2009 +0200
+
+ Speed up repeatcpy() by at least 40% for 1-char or numerous repeats
+
+ And don't make it receive the interpreter anymore.
+
+ For 1-char repeats, use memset(). Otherwise, use the old implementation up
+ to some (small) length, and then use memcpy() in a binary manner, based on
+ what we previously copied.
+
+ Note that we use memcpy() so both strings shouldn't overlap. The previous
+ implementation didn't allow this as well. This would be a good place to use
+ the restrict keyword from C99. I'm not sure if Configure has a probe for it.
+
+=head2 set utf8 bit on inferred method names when C<use utf8>
+
+=head2 New debugging flag -DB now dumps subroutine definitions,
+ leaving -Dx for its original purpose of dumping syntax trees.
+
+
+=head2 Make MAD understand the "..." operator
+
+
+=head2 Add support for Abstract namespace sockets
+
+ Abstract namespace sockets are Linux-specific socket type that live in
+ AF_UNIX family, slightly abusing it to be able to use arbitrary
+ character arrays as addresses: They start with nul byte and are not
+ terminated by nul byte, but with the length passed to the socket()
+ system call.
+
+ Added regression test for the correct address length computation.
+
+ Signed-off-by: Lubomir Rintel <lkundrak@fedoraproject.org>
+
+
+=head2 Note that linearising C3 MRO is now 40% faster for single inheritance.
+
+=head2 Fix a B::Deparse bug - constants and PCSs were appearing as subroutine stubs.
+
+
+
+
+
+
+=head2 Win32: Don't explicitly link against msvcrt when using MinGW.
+
+ The latest releases of MinGW generate hard linker errors
+ when msvcrt is specified explicitly. It will still link
+ against this library implicitly anyways, so specifying it
+ isn't needed.
+
+=head2 Add security contact information to perlsec
+
+=item Introduce "delete local"
+
+commit 7332a6c406299d5e73836d2410689bd7c3ae4782
-=cut
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