=head1 NAME
-[ 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 v5.31.3
+perldelta - what is new for perl v5.31.5
=head1 DESCRIPTION
-This document describes differences between the 5.31.2 release and the 5.31.3
+This document describes differences between the 5.31.4 release and the 5.31.5
release.
-If you are upgrading from an earlier release such as 5.31.1, first read
-L<perl5312delta>, which describes differences between 5.31.1 and 5.31.2.
-
-=head1 Notice
-
-XXX Any important notices here
-
-=head1 Core Enhancements
-
-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.
-
-[ List each enhancement as a =head2 entry ]
-
-=head1 Security
-
-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.
-
-[ List each security issue as a =head2 entry ]
+If you are upgrading from an earlier release such as 5.31.3, first read
+L<perl5314delta>, which describes differences between 5.31.3 and 5.31.4.
=head1 Incompatible Changes
-XXX For a release on a stable branch, this section aspires to be:
-
- There are no changes intentionally incompatible with 5.XXX.XXX
- If any exist, they are bugs, and we request that you submit a
- report. See L</Reporting Bugs> below.
-
-[ List each incompatible change as a =head2 entry ]
-
-=head2 Plain "0" string now treated as a number for range operator
-
-Previously a range C< "0" .. "-1" > would produce a range of numeric
-strings from "0" through "99", this now produces an empty list, just
-as C< 0 .. -1 > does.
-
-This was due to a special case that treated strings starting with "0"
-as strings so ranges like C< "00" .. "03" > produced C< "00", "01",
-"02", "03" >, but didn't specially handle the string C<"0">.
-
-[perl #133695]
-
-=head1 Deprecations
-
-XXX Any deprecated features, syntax, modules etc. should be listed here.
-
-=head2 Module removals
-
-XXX Remove this section if not applicable.
+=head2 Modifiable variables are no longer permitted in constants
-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.
+Code like:
-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.
+ my $var;
+ $sub = sub () { $var };
-Note that these are (with rare exceptions) fine modules that you are encouraged
-to continue to use. Their disinclusion from core primarily hinges on their
-necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
-not usually on concerns over their design.
+where C<$var> is referenced elsewhere in some sort of modiable context
+now produces an exception when the sub is defined.
-=over
+This error can be avoided by adding a return to the sub definition:
-=item XXX
+ $sub = sub () { return $var };
-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.
+This has been deprecated since perl 5.22.
-=back
-
-[ List each other deprecation as a =head2 entry ]
-
-=head1 Performance Enhancements
+[perl #131138]
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
+=head1 Modules and Pragmata
-[ List each enhancement as an =item entry ]
+=head2 Updated Modules and Pragmata
=over 4
=item *
-XXX
-
-=back
-
-=head1 Modules and Pragmata
-
-XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
-go here. If Module::CoreList is updated, generate an initial draft of the
-following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
-for important changes should then be added by hand. In an ideal world,
-dual-life modules would have a F<Changes> file that could be cribbed.
+L<B> has been upgraded from version 1.76 to 1.77.
-The list of new and updated modules is modified automatically as part of
-preparing a Perl release, so the only reason to manually add entries here is if
-you're summarising the important changes in the module update. (Also, if the
-manually-added details don't match the automatically-generated ones, the
-release manager will have to investigate the situation carefully.)
-
-[ Within each section, list entries as an =item entry ]
+=item *
-=head2 New Modules and Pragmata
-
-=over 4
+L<B::Deparse> has been upgraded from version 1.49 to 1.50.
=item *
-XXX Remove this section if not applicable.
+L<Devel::PPPort> has been upgraded from version 3.55 to 3.54.
-=back
-
-=head2 Updated Modules and Pragmata
+=item *
-=over 4
+L<Digest::MD5> has been upgraded from version 2.55 to 2.55_01.
=item *
-L<Devel::PPPort> has been upgraded from version 3.54 to 3.55.
+L<Dumpvalue> has been upgraded from version 1.18 to 1.21.
-The test files generated on Win32 are now identical to when they are
-generated on POSIX-like systems.
+Previously, when dumping elements of an array and encountering an undefined
+value, the string printed would have been C<empty array>. This has been
+changed to what was apparently originally intended: C<empty slot>.
=item *
-L<File::Find> has been upgraded from version 1.36 to 1.37.
-
-On Win32, the tests no longer require either a file in the drive root
-directory, or a writable root directory.
+L<ExtUtils::CBuilder> has been upgraded from version 0.280232 to 0.280233.
=item *
-L<Thread> has been upgraded from version 3.04 to 3.05.
+L<Math::BigInt> has been upgraded from version 1.999816 to 1.999817_01.
=item *
-L<Getopt::Long> has been upgraded from version 2.50 to 2.51.
+L<Math::BigInt::FastCalc> has been upgraded from version 0.5008 to 0.5009.
=item *
-L<Time::HiRes> has been upgradded from version 1.9761 to 1.9762.
-
-Removed obsolete code such as support for pre-5.6 perl and classic
-MacOS. [perl #134288]
+L<Module::CoreList> has been upgraded from version 5.20190920 to 5.20191020.
=item *
-L<XXX> has been upgraded from version A.xx to B.yy.
+L<Safe> has been upgraded from version 2.40 to 2.41.
-If there was something important to note about this change, include that here.
+=item *
-=back
+L<threads> has been upgraded from version 2.22 to 2.23.
-=head2 Removed Modules and Pragmata
+=item *
-=over 4
+L<Time::HiRes> has been upgraded from version 1.9763 to 1.9764.
=item *
-XXX
+L<XS::APItest> has been upgraded from version 1.03 to 1.04.
+
+If there was something important to note about this change, include that here.
=back
=head1 Documentation
-XXX Changes to files in F<pod/> go here. Consider grouping entries by
-file and be sure to link to the appropriate page, e.g. L<perlfunc>.
-
-=head2 New Documentation
-
-XXX Changes which create B<new> files in F<pod/> go here.
-
-=head3 L<XXX>
-
-XXX Description of the purpose of the new file here
-
=head2 Changes to Existing Documentation
We have attempted to update the documentation to reflect the changes
listed in this document. If you find any we have missed, send email
to L<perlbug@perl.org|mailto:perlbug@perl.org>.
-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.
-
-Additionally, the following selected changes have been made:
-
-=head3 L<XXX>
+=head3 L<perlguts>
=over 4
=item *
-XXX Description of the change here
+Details of the various stacks within the perl interpreter are now explained
+here.
=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>.
-
-XXX New or changed warnings emitted by the core's C<C> code go here. Also
-include any changes in L<perldiag> that reconcile it to the C<C> code.
-
-=head2 New Diagnostics
-
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
+Additionally, the following selected changes have been made:
-=head3 New Errors
+=head3 URLs have been changed to https://, stale links updated
=over 4
=item *
-XXX L<message|perldiag/"message">
-
-=back
+Where applicable, the URLs in the documentation have been moved from
+using the http:// protocol to https:// . This also affects the location
+of the bug tracker at L<https://rt.perl.org>.
-=head3 New Warnings
+=item *
-=over 4
+Some links to OS/2 libraries, Address Sanitizer and other system tools
+had gone stale. These have been updated with working links.
=item *
-XXX L<message|perldiag/"message">
+Some links to old mails on perl5-porters had gone stale. These have been
+updated with working links.
=back
-=head2 Changes to Existing Diagnostics
+=head1 Diagnostics
-XXX Changes (i.e. rewording) of diagnostic messages go here
+The following additions or changes have been made to diagnostic output,
+including warnings and fatal error messages. For the complete list of
+diagnostic messages, see L<perldiag>.
+
+=head2 Changes to Existing Diagnostics
=over 4
=item *
-XXX Describe change here
+L<Can't use global %s in %s|perldiag/"Can't use global %s in %s">
-=back
+This error message has been slightly reformatted from the original C<Can't use
+global %s in "%s">, and in particular misleading error messages like C<Can't
+use global $_ in "my"> are now rendered as C<Can't use global $_ in subroutine
+signature>.
-=head1 Utility Changes
+=item *
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
+L<Constants from lexical variables potentially modified elsewhere are no longer permitted|perldiag/"Constants from lexical variables potentially modified elsewhere are no longer permitted">
-[ 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. ]
+This error message replaces the former C<Constants from lexical variables
+potentially modified elsewhere are deprecated. This will not be allowed in Perl
+5.32> to reflect the fact that this previously deprecated usage has now been
+transformed into an exception. The message's classification has also been
+updated from D (deprecated) to F (fatal).
-=head2 L<XXX>
+=back
+
+=head1 Configuration and Compilation
=over 4
=item *
-XXX
-
-=back
-
-=head1 Configuration and Compilation
-
-XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
-go here. Any other changes to the Perl build process should be listed here.
-However, any platform-specific changes should be listed in the
-L</Platform Support> section, instead.
+Perl now no longer probes for C<d_u32align>, defaulting to C<define>
+on all platforms. This check was error prone when it was done, which
+was on 32-bit platforms only. [perl #133495]
-[ List changes as an =item entry ].
+=item *
-=over 4
+Documentation and hints for building perl on Z/OS (native EBCDIC) have
+been updated. Still work in progress.
=item *
-XXX
+New probe for malloc_usable_size
=back
=head1 Testing
-XXX Any significant changes to the testing of a freshly built perl should be
-listed here. Changes which create B<new> files in F<t/> go here as do any
-large changes to the testing harness (e.g. when parallel testing was added).
-Changes to existing files in F<t/> aren't worth summarizing, although the bugs
-that they represent may be covered elsewhere.
-
-XXX If there were no significant test changes, say this:
-
Tests were added and changed to reflect the other additions and changes
in this release.
-XXX If instead there were significant changes, say this:
-
-Tests were added and changed to reflect the other additions and
-changes in this release. Furthermore, these significant changes were
-made:
-
-[ List each test improvement as an =item entry ]
-
-=over 4
-
-=item *
-
-XXX
-
-=back
-
=head1 Platform Support
-XXX Any changes to platform support should be listed in the sections below.
-
-[ Within the sections, list each platform as an =item entry with specific
-changes as paragraphs below it. ]
-
-=head2 New Platforms
-
-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 XXX-some-platform
-
-XXX
-
-=back
-
-=head2 Discontinued Platforms
-
-XXX List any platforms that this version of perl no longer compiles on.
-
-=over 4
-
-=item XXX-some-platform
-
-XXX
-
-=back
-
=head2 Platform-Specific Notes
-XXX List any changes for specific platforms. This could include configuration
-and compilation changes or changes in portability/compatibility. However,
-changes within modules for platforms should generally be listed in the
-L</Modules and Pragmata> section.
-
=over 4
=item Windows
-F<t/op/magic.t> could fail if environment varables starting with
-C<FOO> already existed.
-
-=back
-
-=head1 Internal Changes
-
-XXX Changes which affect the interface available to C<XS> code go here. Other
-significant internal changes for future core maintainers should be noted as
-well.
-
-[ List each change as an =item entry ]
-
=over 4
=item *
-A new parser function L<parse_subsignature()|perlapi/parse_subsignature>
-allows a keyword plugin to parse a subroutine signature while C<use feature
-'signatures'> is in effect. This allows custom keywords to implement
-semantics similar to regular C<sub> declarations that include signatures.
-[perl #132474]
+Support for building perl with Visual C++ 6.0 has now been removed.
=item *
-Since on some platforms we need to hold a mutex when temporarily
-switching locales, new macros (C<STORE_LC_NUMERIC_SET_TO_NEEDED_IN>,
-C<WITH_LC_NUMERIC_SET_TO_NEEDED> and C<WITH_LC_NUMERIC_SET_TO_NEEDED_IN>)
-have been added to make it easier to do this safely and efficiently
-as part of [perl #134172].
+Building perl with Visual C++ 2013 and earlier was broken in the previous
+release but has now been fixed.
=back
-=head1 Selected Bug Fixes
-
-XXX Important bug fixes in the core language are summarized here. Bug fixes in
-files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
-
-[ List each fix as an =item entry ]
-
-=over 4
-
-=item *
-
-C<< $@ = 100; die; >> now correctly propagates the 100 as an exception
-instead of ignoring it. [perl #134291]
-
-=item *
-
-C<< 0 0x@ >> no longer asserts in S_no_op(). [perl #134310]
-
-=item *
-
-Exceptions thrown while C<$@> is read-only could result in infinite
-recursion as perl tried to update C<$@>, which throws another
-exception, resulting in a stack overflow. Perl now replaces C<$@>
-with a copy if it's not a simple writable SV. [perl #134266]
-
=back
-=head1 Known Problems
-
-XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
-tests that had to be C<TODO>ed for the release would be noted here. Unfixed
-platform specific bugs also go here.
-
-[ List each fix as an =item entry ]
+=head1 Internal Changes
=over 4
=item *
-XXX
-
-=back
-
-=head1 Errata From Previous Releases
-
-=over 4
+Added the C<<PL_curstackinfo->si_cxsubix>> field. This records the stack
+index of the most recently pushed sub/format/eval context. It is set and
+restored automatically by C<cx_pushsub()>, C<cx_popsub()> etc., but would
+need to be manually managed if you do any unusual manipulation of the
+context stack.
=item *
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+Various macros dealing with character type classification and changing
+case where the input is encoded in UTF-8 now require an extra parameter
+to prevent potential reads beyond the end of the buffer. Use of these
+has generated a deprecation warning since 5.26. Details are in
+L<perldeprecation/In XS code, use of various macros dealing with UTF-8.>
=back
-=head1 Obituary
-
-XXX If any significant core contributor or member of the CPAN community has
-died, add a short obituary here.
-
=head1 Acknowledgements
XXX Generate this with:
- perl Porting/acknowledgements.pl v5.31.2..HEAD
+ perl Porting/acknowledgements.pl v5.31.4..HEAD
=head1 Reporting Bugs
If you find what you think is a bug, you might check the perl bug database
at L<https://rt.perl.org/>. There may also be information at
-L<http://www.perl.org/>, the Perl Home Page.
+L<https://www.perl.org/>, the Perl Home Page.
If you believe you have an unreported bug, please run the L<perlbug> program
included with your release. Be sure to trim your bug down to a tiny but
https://perl5.git.perl.org / perl5.git / blobdiff