=head1 NAME
-perldelta - what is new for perl v5.21.9
+[ this is a template for a new perldelta file. Any text flagged as XXX needs
+to be processed before release. ]
+
+perldelta - what is new for perl v5.21.10
=head1 DESCRIPTION
-This document describes differences between the 5.21.8 release and the 5.21.9
+This document describes differences between the 5.21.9 release and the 5.21.10
release.
-If you are upgrading from an earlier release such as 5.21.7, first read
-L<perl5218delta>, which describes differences between 5.21.7 and 5.21.8.
+If you are upgrading from an earlier release such as 5.21.8, first read
+L<perl5219delta>, which describes differences between 5.21.8 and 5.21.9.
=head1 Notice
-With this release we are now in the user-visible changes portion of the code
-freeze as we prepare for the next stable release of Perl 5.
+XXX Any important notices here
=head1 Core Enhancements
-=head2 qr/\b{gcb}/ is now handled in regular expressions
-
-C<gcb> stands for Grapheme Cluster Boundary. It is a Unicode property
-that finds the boundary between sequences of characters that look like a
-single character to a native speaker of a language. Perl has long had
-the ability to deal with these through the C<\X> regular escape
-sequence. Now, there is an alternative way of handling these. See
-L<perlrebackslash/\b{}, \b, \B{}, \B> for details.
-
-=head2 qr/\b{wb}/ is now handled in regular expressions
-
-C<wb> stands for Word Boundary. It is a Unicode property
-that finds the boundary between words. This is similar to the plain
-C<\b> (without braces) but is more suitable for natural language
-processing. It knows, for example that apostrophes can occur in the
-middle of words. See L<perlrebackslash/\b{}, \b, \B{}, \B> for details.
-
-=head2 qr/\b{sb}/ is now handled in regular expressions
-
-C<sb> stands for Sentence Boundary. It is a Unicode property
-to aid in parsing natural language sentences.
-See L<perlrebackslash/\b{}, \b, \B{}, \B> for details.
+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.
-=head2 New bitwise operators
+[ List each enhancement as a =head2 entry ]
-A new experimental facility has been added that makes the four standard
-bitwise operators (C<& | ^ ~>) treat their operands consistently as
-numbers, and introduces four new dotted operators (C<&. |. ^. ~.>) that
-treat their operands consistently as strings. The same applies to the
-assignment variants (C<&= |= ^= &.= |.= ^.=>).
+=head1 Security
-To use this, enable the "bitwise" feature and disable the
-"experimental::bitwise" warnings category. See L<perlop/Bitwise String
-Operators> for details. [rt.perl.org #123466]
+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.
-=head2 C<no re> covers more and is lexical
-
-Previously running C<no re> would only turn off a few things. Now it
-turns off all the enabled things. For example, previously, you
-couldn't turn off debugging, once enabled, inside the same block.
+[ List each security issue as a =head2 entry ]
=head1 Incompatible Changes
-There are no changes intentionally incompatible with 5.21.8.
-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
+=head2 C<(?[...])> operators now follow standard Perl precedence
-=item *
+This experimental feature allows set operations in regular expression
+patterns. Prior to this, the intersection operator had the same
+precedence as the other binary operators. Now it has higher precedence.
+This could lead to different outcomes than existing code expects (though
+the documentation has always noted that this change might happen,
+recommending fully parenthesizing the expressions). See
+L<perlrecharclass/Extended Bracketed Character Classes>.
-L<attributes> has been upgraded from version 0.25 to 0.26.
-
-=item *
-
-L<B> has been upgraded from version 1.55 to 1.56.
+=head1 Deprecations
-=item *
+XXX Any deprecated features, syntax, modules etc. should be listed here.
-L<B::Debug> has been upgraded from version 1.22 to 1.23.
+=head2 Module removals
-=item *
+XXX Remove this section if inapplicable.
-L<B::Deparse> has been upgraded from version 1.32 to 1.33.
+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.
-=over 4
+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.
-=item *
+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.
-Deparse now provides a defined state sub in inner subs.
+=over
-=item *
+=item XXX
-Since version Perl 5.21.6, Deparse would croak on special constants, but
-this has now been fixed.
+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
-=item *
+[ List each other deprecation as a =head2 entry ]
-L<Benchmark> has been upgraded from version 1.19 to 1.20.
+=head1 Performance Enhancements
-=item *
-
-L<bigint>, L<bignum>, L<bigrat> have been upgraded to version 0.39.
-
-Document in CAVEATS that using strings as numbers won't always invoke
-the big number overloading, and how to invoke it. [rt.perl.org #123064]
-
-=item *
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
-L<bignum> has been upgraded from version 0.38 to 0.39.
-
-=item *
-
-L<Carp> has been upgraded from version 1.34 to 1.35.
+[ List each enhancement as a =item entry ]
=over 4
=item *
-Carp now handles non-ASCII platforms better.
-
-=item *
-
-Off-by-one error fix for Perl E<lt> 5.14.
+The functions
+C<utf8::native_to_unicode()> and
+C<utf8::unicode_to_native()> (see L<utf8>)
+are now optimized out on ASCII platforms.
+There is now not even a minimal performance hit in writing code portable
+between ASCII and EBCDIC platforms.
=back
-=item *
-
-L<Config::Perl::V> has been upgraded from version 0.22 to 0.23.
+=head1 Modules and Pragmata
-=item *
+XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
+go here. If Module::CoreList is updated, generate an initial draft of the
+following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
+for important changes should then be added by hand. In an ideal world,
+dual-life modules would have a F<Changes> file that could be cribbed.
-L<constant> has been upgraded from version 1.32 to 1.33.
+[ Within each section, list entries as a =item entry ]
-=item *
+=head2 New Modules and Pragmata
-L<CPAN::Meta::Requirements> has been upgraded from version 2.131 to 2.132
+=over 4
=item *
-L<Data::Dumper> has been upgraded from version 2.156 to 2.157.
+XXX
-=item *
+=back
-L<Devel::Peek> has been upgraded from version 1.21 to 1.22.
+=head2 Updated Modules and Pragmata
+
+=over 4
=item *
-L<DynaLoader> has been upgraded from version 1.30 to 1.31.
+L<B> has been upgraded from version 1.56 to 1.57.
=item *
-L<Encode> has been upgraded from version 2.67 to 2.70.
+L<B::Deparse> has been upgraded from version 1.33 to 1.34.
-Building in C++ mode on Windows now works.
+Deparse C<$#_> as that instead of as C<$#{_}>. [perl #123947]
=item *
-L<encoding> has been upgraded from version 2.12 to 2.13.
+L<Carp> has been upgraded from version 1.35 to 1.36.
=item *
-L<Errno> has been upgraded from version 1.22 to 1.23.
+L<CPAN> has been upgraded from version 2.05 to 2.10.
-Add C<-P> to the preprocessor command-line on GCC 5. GCC added extra
-line directives, breaking parsing of error code definitions. [rt.perl.org
-#123784]
+=over 4
=item *
-L<ExtUtils::Miniperl> has been upgraded from version 1.03 to 1.04.
+Add support for C<Cwd::getdcwd()> and introduce workaround for a misbehaviour
+seen on Strawberry Perl 5.20.1.
=item *
-L<feature> has been upgraded from version 1.39 to 1.40.
+Fix C<chdir()> after building dependencies bug.
=item *
-L<HTTP::Tiny> has been upgraded from version 0.053 to 0.054.
+Introduce experimental support for plugins/hooks.
=item *
-L<Opcode> has been upgraded from version 1.31 to 1.32.
+Integrate the App::Cpan sources.
=item *
-L<overload> has been upgraded from version 1.24 to 1.25.
+Do not check recursion on optional dependencies.
=item *
-L<Perl::OSType> has been upgraded from version 1.007 to 1.008.
-
-=item *
+Sanity check META.yml to contain a hash.
+L<[cpan #95271]|https://rt.cpan.org/Ticket/Display.html?id=95271>
-L<perlfaq> has been upgraded from version 5.0150046 to 5.021009.
+=back
=item *
-L<PerlIO::scalar> has been upgraded from version 0.21 to 0.22.
-
-Attempting to write at file positions impossible for the platform now
-fail early rather than wrapping at 4GB.
+L<CPAN::Meta> has been upgraded from version 2.143240 to 2.150001.
=item *
-L<Pod::Parser> has been upgraded from version 1.62 to 1.63.
+L<Data::Dumper> has been upgraded from version 2.157 to 2.158.
=item *
-L<Pod::Perldoc> has been upgraded from version 3.24 to 3.25.
+L<Devel::PPPort> has been upgraded from version 3.28 to 3.31.
=item *
-L<POSIX> has been upgraded from version 1.49 to 1.51.
+L<DynaLoader> has been upgraded from version 1.31 to 1.32.
=item *
-L<re> has been upgraded from version 0.30 to 0.31.
+L<Encode> has been upgraded from version 2.70 to 2.72.
=item *
-L<Socket> has been upgraded from version 2.016 to 2.018.
+L<encoding> has been upgraded from version 2.13 to 2.14.
=item *
-L<Storable> has been upgraded from version 2.52 to 2.53.
+L<Getopt::Long> has been upgraded from version 2.43 to 2.45.
=item *
-L<Test::Simple> has been upgraded from version 1.301001_097 to 1.301001_098.
+L<locale> has been upgraded from version 1.05 to 1.06.
=item *
-L<threads::shared> has been upgraded from version 1.47 to 1.48.
+L<Locale::Codes> has been upgraded from version 3.33 to 3.34.
=item *
-L<Unicode::Collate> has been upgraded from version 1.10 to 1.11.
+L<Module::CoreList> has been reverted from version 5.20150220 to 5.20150320.
=item *
-L<Unicode::UCD> has been upgraded from version 0.59 to 0.61.
-
-=over 4
-
-=item *
+L<parent> has been upgraded from version 0.228 to 0.232.
-A new function L<property_values()|Unicode::UCD/prop_values()>
-has been added to return a given property's possible values.
+No changes to installed files other than the version bump.
=item *
-A new function L<charprop()|Unicode::UCD/charprop()>
-has been added to return the value of a given property for a given code
-point.
+L<Pod::Functions> has been upgraded from version 1.08 to 1.09.
=item *
-A new function L<charprops_all()|Unicode::UCD/charprops_all()>
-has been added to return the values of all Unicode properties for a
-given code point.
+L<POSIX> has been upgraded from version 1.51 to 1.52.
=item *
-A bug has been fixed so that L<propaliases()|Unicode::UCD/prop_aliases()>
-returns the correct short and long names for the Perl extensions where
-it was incorrect.
+L<re> has been upgraded from version 0.31 to 0.32.
=item *
-A bug has been fixed so that
-L<prop_value_aliases()|Unicode::UCD/prop_value_aliases()>
-returns C<undef> instead of a wrong result for properties that are Perl
-extensions.
+L<Test::Simple> has been reverted from version 1.301001_098 to 1.001014.
=item *
-This module now works on EBCDIC platforms.
+L<Text::Balanced> has been upgraded from version 2.02 to 2.03.
-=back
+No changes to installed files other than the version bump.
=item *
-L<VMS::Stdio> has been upgraded from version 2.4 to 2.41.
+L<Text::ParseWords> has been upgraded from version 3.29 to 3.30.
=item *
-L<warnings> has been upgraded from version 1.30 to 1.31.
+L<threads> has been upgraded from version 1.96_001 to 2.01.
=item *
-L<Win32> has been upgraded from version 0.49 to 0.51.
-
-GetOSName() now supports Windows 8.1, and building in C++ mode now works.
+L<utf8> has been upgraded from version 1.14 to 1.15.
=item *
-L<Win32API::File> has been upgraded from version 0.1201 to 0.1202
-
-Building in C++ mode now works.
+L<XS::APItest> has been upgraded from version 0.70 to 0.71.
=back
-=head1 Documentation
-
-=head2 New Documentation
-
-=head3 L<perlrebackslash>
+=head2 Removed Modules and Pragmata
=over 4
=item *
-Added documentation of C<\b{sb}>, C<\b{wb}>, C<\b{gcb}>, and C<\b{g}>.
+XXX
=back
-=head3 L<perlrequick>
-
-=over 4
-
-=item *
-
-Added example for C<\b{wb}>.
-
-=back
+=head1 Documentation
-=head3 L<perlretut>
+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
-=item *
+XXX Changes which create B<new> files in F<pod/> go here.
-Added example for C<\b{wb}>.
+=head3 L<XXX>
-=back
+XXX Description of the purpose of the new file here
=head2 Changes to Existing Documentation
-=head3 L<perlunicode>
+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<perldata>
=over 4
=item *
-Update B<Default Word Boundaries> under
-L<perlunicode/"Unicode Regular Expression Support Level">'s
-B<Extended Unicode Support>.
+Documentation has been added regarding the special floating point values C<Inf>
+and C<NaN>.
=back
-=head3 L<perlunicook>
+=head3 L<perlexperiment>
=over 4
=item *
-Clarify that autodie E<gt>= 2.26 works with C<use open>.
+Removed note about C<\s> matching C<VT> now that it is no longer experimental.
=item *
-Correct warning message for C<use autodie> and C<use open>.
+Added note that C<use re 'strict'> has been introduced experimentally.
=back
-=head3 L<perlfaq>
+=head3 L<perlpolicy>
=over 4
=item *
-L<perlfaq> has been synchronized with version 5.021009 from CPAN.
+The documentation of what to expect to see in future maintenance releases has
+been updated. Essentially the same types of changes will be included as before
+but with fewer changes that don't affect the installation or execution of perl.
=back
-=head3 L<perlop>
+=head1 Diagnostics
-=over 4
+The following additions or changes have been made to diagnostic output,
+including warnings and fatal error messages. For the complete list of
+diagnostic messages, see L<perldiag>.
-=item *
+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.
-Correct the version number which removes C<m?PATTERN?>. It was Perl 5.22.0.
+=head2 New Diagnostics
-=back
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
-=head3 L<perlvar>
+=head3 New Errors
=over 4
=item *
-Further clarify version number representations and usage.
+L<Invalid quantifier in {,} in regex; marked by <-- HERE in mE<sol>%sE<sol>|perldiag/"Invalid quantifier in {,} in regex; marked by <-- HERE in m/%s/">
+
+(F) The pattern looks like a {min,max} quantifier, but the min or max could not
+be parsed as a valid number - either it has leading zeroes, or it represents
+too big a number to cope with. The S<<-- HERE> shows where in the regular
+expression the problem was discovered. See L<perlre>.
=back
-=head3 L<perlmodstyle>
+=head3 New Warnings
=over 4
=item *
-Instead of pointing to the module list, we are now pointing to
-L<PrePAN|http://prepan.org/>.
+XXX L<message|perldiag/"message">
=back
-=head1 Diagnostics
-
-The following additions or changes have been made to diagnostic output,
-including warnings and fatal error messages. For the complete list of
-diagnostic messages, see L<perldiag>.
-
-=head2 New Diagnostics
+=head2 Changes to Existing Diagnostics
-=head3 New Warnings
+XXX Changes (i.e. rewording) of diagnostic messages go here
=over 4
=item *
-L<'%s' is an unknown bound type in regex|perldiag/"'%s' is an unknown bound type in regex; marked by <-- HERE in m/%s/">
+XXX Describe change here
-You used C<\b{...}> or C<\B{...}> and the C<...> is not known to
-Perl. The current valid ones are given in
-L<perlrebackslash/\b{}, \b, \B{}, \B>.
-
-=item *
+=back
-L<Use of \b{} for non-UTF-8 locale is wrong. Assuming a UTF-8 locale|perldiag/"Use of \b{} for non-UTF-8 locale is wrong. Assuming a UTF-8 locale">
+=head1 Utility Changes
-You are matching a regular expression using locale rules,
-and a Unicode boundary is being matched, but the locale is not a Unicode
-one. This doesn't make sense. Perl will continue, assuming a Unicode
-(UTF-8) locale, but the results could well be wrong except if the locale
-happens to be ISO-8859-1 (Latin1) where this message is spurious and can
-be ignored.
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directory F<utils>.
-=item *
+[ 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. ]
-L<< Using E<sol>u for '%s' instead of E<sol>%s in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Using E<sol>u for '%s' instead of E<sol>%s in regex; marked by <-- HERE in mE<sol>%sE<sol>" >>
+=head2 L<XXX>
-You used a Unicode boundary (C<\b{...}> or C<\B{...}>) in a
-portion of a regular expression where the character set modifiers C</a>
-or C</aa> are in effect. These two modifiers indicate an ASCII
-interpretation, and this doesn't make sense for a Unicode definition.
-The generated regular expression will compile so that the boundary uses
-all of Unicode. No other portion of the regular expression is affected.
+=over 4
=item *
-L<The bitwise feature is experimental|perldiag/"The bitwise feature is experimental">
-
-This warning is emitted if you use bitwise
-operators (C<& | ^ ~ &. |. ^. ~.>) with the "bitwise" feature enabled.
-Simply suppress the warning if you want to use the feature, but know
-that in doing so you are taking the risk of using an experimental
-feature which may change or be removed in a future Perl version:
-
- no warnings "experimental::bitwise";
- use feature "bitwise";
- $x |.= $y;
+XXX
=back
-=head2 Changes to Existing Diagnostics
-
-=over 4
-
-=item *
-
-B<Unusual use of %s in void context> has been removed. It might
-come back in a future release.
+=head1 Configuration and Compilation
-=item *
+XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
+go here. Any other changes to the Perl build process should be listed here.
+However, any platform-specific changes should be listed in the
+L</Platform Support> section, instead.
-L<Argument "%s" isn't numeric%s|perldiag/"Argument "%s" isn't numeric%s">
-now adds the following note:
+[ List changes as a =item entry ].
- Note that for the C<Inf> and C<NaN> (infinity and not-a-number) the
- definition of "numeric" is somewhat unusual: the strings themselves
- (like "Inf") are considered numeric, and anything following them is
- considered non-numeric.
+=over 4
=item *
-B<Possible precedence problem on bitwise %c operator> reworded as
-L<Possible precedence problem on bitwise %s operator|perldiag/"Possible precedence problem on bitwise %s operator">.
+XXX
=back
-=head1 Utility Changes
+=head1 Testing
+
+XXX Any significant changes to the testing of a freshly built perl should be
+listed here. Changes which create B<new> files in F<t/> go here as do any
+large changes to the testing harness (e.g. when parallel testing was added).
+Changes to existing files in F<t/> aren't worth summarizing, although the bugs
+that they represent may be covered elsewhere.
-=head2 L<h2ph>
+[ List each test improvement as a =item entry ]
=over 4
=item *
-F<h2ph> now handles hexadecimal constants in the compiler's predefined
-macro definitions, as visible in C<$Config{cppsymbols}>. [rt.perl.org
-#123784]
+Tests for performance issues have been added in the file F<t/perf/taint.t>.
=back
-=head2 L<encguess>
+=head1 Platform Support
-=over 4
+XXX Any changes to platform support should be listed in the sections below.
-=item *
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
-No longer depends on non-core module anymore.
-
-=back
+=head2 New Platforms
-=head1 Configuration and Compilation
+XXX List any platforms that this version of perl compiles on, that previous
+versions did not. These will either be enabled by new files in the F<hints/>
+directories, or new subdirectories and F<README> files at the top level of the
+source tree.
=over 4
-=item *
+=item z/OS running EBCDIC Code Page 1047
-F<Configure> now checks for F<lrintl>, F<lroundl>, F<llrintl>, and F<llroundl>.
+Core perl now works on this EBCDIC platform. Early perls also worked,
+but, even though support wasn't officially withdrawn, recent perls would
+not compile and run well. Perl v5.20 would work, but had many bugs
+which have now been fixed. Many CPAN modules that ship with Perl still
+fail tests, including Pod::Simple. However the version of Pod::Simple
+currently on CPAN should work; it was fixed too late to include in
+Perl v5.22. Work is under way to fix many of the still-broken CPAN
+modules, which likely will be installed on CPAN when completed, so that
+you may not have to wait until v5.24 to get a working version.
=back
-=head1 Testing
+=head2 Discontinued Platforms
+
+XXX List any platforms that this version of perl no longer compiles on.
=over 4
-=item *
+=item XXX-some-platform
-Added F<t/op/dump.t> for testing C<dump>.
+XXX
=back
-=head1 Deprecations
-
-=head2 Support for new warnings categories outside of "all"
-
-The new option for warnings outside the B<all> category in the L<warnings>
-pragma has been removed for now.
-
-For more context, you can refer to the following
-L<discussion thread|http://www.nntp.perl.org/group/perl.perl5.porters/2015/01/msg225066.html>.
-
-=head1 Platform Support
-
=head2 Platform-Specific Notes
-=head3 Win32
+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 *
+=item XXX-some-platform
-Perl can now be built in C++ mode on Windows by setting the makefile macro
-C<USE_CPLUSPLUS> to the value "define".
-
-=item *
+XXX
-List form pipe open no longer falls back to the shell.
+=back
-=item *
+=head1 Internal Changes
-In release 5.21.8 compiling on VC with dmake was broken. Fixed.
+XXX Changes which affect the interface available to C<XS> code go here. Other
+significant internal changes for future core maintainers should be noted as
+well.
-=item *
+[ List each change as a =item entry ]
-New C<DebugSymbols> and C<DebugFull> configuration options added to
-Windows makefiles.
+=over 4
=item *
-L<B> now compiles again on Windows.
+Macros have been created to allow XS code to better manipulate the POSIX
+locale category C<LC_NUMERIC>.
+See L<perlapi/Locale-related functions and macros>.
=back
-=head3 Solaris
+=head1 Selected Bug Fixes
-Look for the Sun Studio compiler in both F</opt/solstudio*> and
-F</opt/solarisstudio*>.
+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>.
-=head3 VMS
+[ List each fix as a =item entry ]
=over 4
=item *
-When spawning a subprocess without waiting, the return value is now
-the correct PID.
+Repeated global pattern matches in scalar context on large tainted
+strings were exponentially slow depending on the current match
+position in the string. [perl #123202]
=item *
-Fix a prototype so linking doesn't fail under the VMS C++ compiler.
-
-=back
-
-=head1 Selected Bug Fixes
-
-=over 4
+Various crashes due to the parser getting confused by syntax errors have
+been fixed. [perl #123801] [perl #123802] [perl #123955] [perl #123995]
=item *
-Patterns starting with C</.*/> are now fast again. [rt.perl.org #123743]
+C<split> in the scope of lexical $_ has been fixed not to fail assertions.
+[perl #123763]
=item *
-The original visible value of C<$/> is now preserved when it is set to
-an invalid value. Previously if you set C<$/> to a reference to an
-array, for example, perl would produce a runtime error and not set
-C<PL_rs>, but perl code that checked C<$/> would see the array
-reference. [rt.perl.org #123218]
+C<my $x : attr> syntax inside various list operators no longer fails
+assertions. [perl #123817]
=item *
-In a regular expression pattern, a POSIX class, like C<[:ascii:]>, must
-be inside a bracketed character class, like C</qr[[:ascii:]]>. A
-warning is issued when something looking like a POSIX class is not
-inside a bracketed class. That warning wasn't getting generated when
-the POSIX class was negated: C<[:^ascii:]>. This is now fixed.
+An @ sign in quotes followed by a non-ASCII digit (which is not a valid
+identifier) would cause the parser to crash, instead of simply trying the @
+as literal. This has been fixed. [perl #123963]
=item *
-Fix a couple of other size calculation overflows. [rt.perl.org #123554]
+C<*bar::=*foo::=*glob_with_hash> has been crashing since 5.14, but no
+longer does. [perl #123847]
=item *
-A bug introduced in 5.21.6, C<dump LABEL> acted the same as C<goto
-LABEL>. This has been fixed. [rt.perl.org #123836]
+C<foreach> in scalar context was not pushing an item on to the stack,
+resulting in bugs. (C<print 4, scalar do { foreach(@x){} } + 1> would
+print 5.) It has been fixed to return C<undef>. [perl #124004]
-=item *
+=back
-Perl 5.14.0 introduced a bug whereby C<eval { LABEL: }> would crash. This
-has been fixed. [rt.perl.org #123652]
+=head1 Known Problems
-=item *
+XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
+tests that had to be C<TODO>ed for the release would be noted here. Unfixed
+platform specific bugs also go here.
-Various crashes due to the parser getting confused by syntax errors have
-been fixed. [rt.perl.org #123617] [rt.perl.org #123737]
-[rt.perl.org #123753] [rt.perl.org #123677]
+[ List each fix as a =item entry ]
+
+=over 4
=item *
-Code like C</$a[/> used to read the next line of input and treat it as
-though it came immediately after the opening bracket. Some invalid code
-consequently would parse and run, but some code caused crashes, so this is
-now disallowed. [rt.perl.org #123712]
+A goal is for Perl to be able to be recompiled to work reasonably well
+on any Unicode version. In v5.22, though, the earliest such version is
+Unicode 5.1 (current is 7.0).
=item *
-Fix argument underflow for C<pack>. [rt.perl.org #123874]
+EBCDIC platforms
+
+=over 4
=item *
-Fix handling of non-strict C<\x{}>. Now C<\x{}> is equivalent to C<\x{0}>
-instead of faulting.
+Encode and encoding are mostly broken.
=item *
-C<stat -t> is now no longer treated as stackable, just like C<-t stat>.
-[rt.perl.org #123816]
+Many cpan modules that are shipped with core show failing tests
=item *
-The following no longer causes a SEGV: C<qr{x+(y(?0))*}>.
+C<pack>/C<unpack> with C<"U0"> format may not work properly.
-=item *
+=back
-Fixed infinite loop in parsing backrefs in regexp patterns.
+=back
-=item *
+=head1 Errata From Previous Releases
-Several minor bug fixes in behavior of Inf and NaN, including
-warnings when stringifying Inf-like or NaN-like strings. For example,
-"NaNcy" doesn't numify to NaN anymore.
+=over 4
=item *
-Only stringy classnames are now shared. This fixes some failures in L<autobox>. [rt.cpan.org #100819]
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
=back
-=head1 Acknowledgements
-
-Perl 5.21.9 represents approximately 4 weeks of development since Perl 5.21.8
-and contains approximately 170,000 lines of changes across 520 files from 32
-authors.
-
-Excluding auto-generated files, documentation and release tools, there were
-approximately 160,000 lines of changes to 270 .pm, .t, .c and .h files.
+=head1 Obituary
-Perl continues to flourish into its third decade thanks to a vibrant community
-of users and developers. The following people are known to have contributed the
-improvements that became Perl 5.21.9:
+XXX If any significant core contributor has died, we've added a short obituary
+here.
-Chad Granum, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari
-Mannsåker, Daniel Dragan, David Golden, David Mitchell, Father Chrysostomos,
-H.Merijn Brand, Hugo van der Sanden, James E Keenan, James Raspass, Jarkko
-Hietaniemi, Karen Etheridge, Karl Williamson, Kent Fredric, Lajos Veres, Leon
-Timmermans, Lukas Mai, Mathieu Arnold, Matthew Horsfall, Peter Martini, Petr
-Písař, Randy Stauner, Ricardo Signes, Sawyer X, Shlomi Fish, Sisyphus, Steve
-Hay, Tony Cook, Yves Orton, Ævar Arnfjörð Bjarmason.
-
-The list above is almost certainly incomplete as it is automatically generated
-from version control history. In particular, it does not include the names of
-the (very much appreciated) contributors who reported issues to the Perl bug
-tracker.
+=head1 Acknowledgements
-Many of the changes included in this version originated in the CPAN modules
-included in Perl's core. We're grateful to the entire CPAN community for
-helping Perl to flourish.
+XXX Generate this with:
-For a more complete list of all of Perl's historical contributors, please see
-the F<AUTHORS> file in the Perl source distribution.
+ perl Porting/acknowledgements.pl v5.21.9..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff