=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 v5.29.9
+perldelta - what is new for perl v5.31.2
=head1 DESCRIPTION
-This document describes differences between the 5.29.8 release and the 5.29.9
+This document describes differences between the 5.31.1 release and the 5.31.2
release.
-If you are upgrading from an earlier release such as 5.29.7, first read
-L<perl5298delta>, which describes differences between 5.29.7 and 5.29.8.
-
-=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 ]
-
-=head2 Wildcards in Unicode property value specifications are now
-partially supported
-
-You can now do something like this in a regular expression pattern
-
- qr! \p{nv= /(?x) \A [0-5] \z / }!
-
-which matches all Unicode code points which have numeric value is
-between 0 and 5 inclusive.
-
-This marks another step in implementing the regular expression features
-the Unicode Consortium suggests.
-
-Most properties are supported, with the remainder planned for 5.32.
-Details are in L<perlunicode/Wildcards in Property Values>.
-
-=head2 qr'\N{name}' is now supported
-
-Previously it was an error to evaluate a named character C<\N{...}>
-within a single quoted regular expression pattern (whose evaluation is
-deferred from the normal place). This restriction is now removed.
-
-=head2 Unicode 12.0 is supported
-
-For details, see L<https://www.unicode.org/versions/Unicode12.0.0/>.
-
-Because of a change in Unicode release cycles, Perl jumps from Unicode
-10.0 in Perl 5.28 to Unicode 12.0 in Perl 5.30.
-
-=head2 It is now possible to compile perl to always use thread-safe
-locale operations.
-
-Previously, these calls were only used when the perl was compiled to be
-multi-threaded. To always enable them, add
-
- -Accflags='-DUSE_THREAD_SAFE_LOCALE'
-
-to your F<Configure> flags.
-
-
-=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 ]
-
-=head2 Variable length lookbehind in regular expression pattern matching
-is now experimentally supported
-
-Using a lookbehind assertion (like C<(?<=foo)> or C<(?<!bar)> previously
-would generate an error and refuse to compile. Now it compiles (if the
-maximum lookbehind is at most 255 characters), but raises a warning in
-the new C<experimental::vlb> warnings category. This is to caution you
-that the precise behavior is subject to change based on feedback from
-use in the field.
-
-See L<perlre/(?<=pattern)> and L<perlre/(?<!pattern)>.
-
-=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 C<pack()> no longer can return malformed UTF-8
-
-It croaks if it would otherwise return a UTF-8 string that contains
-malformed UTF-8. This protects agains potential security threats. This
-is considered a bug fix as well ([perl #131642]).
-
-=head2 Any set of digits in the Common script are legal in a script run
-of another script
-
-There are several sets of digits in the Common script. C<[0-9]> is the
-most familiar. But there are also C<[\x{FF10}-\x{FF19}]> (FULLWIDTH
-DIGIT ZERO - FULLWIDTH DIGIT NINE), and several sets for use in
-mathematical notation, such as the MATHEMATICAL DOUBLE-STRUCK DIGITs.
-Any of these sets should be able to appear in script runs of, say,
-Greek. But the design of 5.30 overlooked all but the ASCII digits
-C<[0-9]>, so the design was flawed. This has been fixed, so is both a
-bug fix and an incompatibility. [perl #133547]
-
-All digits in a run still have to come from the same set of ten digits.
-
-=head1 Deprecations
-
-XXX Any deprecated features, syntax, modules etc. should be listed here.
-
-=head2 Module removals
-
-XXX Remove this section if not applicable.
-
-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.
-
-The core versions of these modules will now issue C<"deprecated">-category
-warnings to alert you to this fact. To silence these deprecation warnings,
-install the modules in question from CPAN.
-
-Note that these are (with rare exceptions) fine modules that you are encouraged
-to continue to use. Their disinclusion from core primarily hinges on their
-necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
-not usually on concerns over their design.
-
-=over
-
-=item XXX
-
-XXX Note that deprecated modules should be listed here even if they are listed
-as an updated module in the L</Modules and Pragmata> section.
-
-=back
-
-[ List each other deprecation as a =head2 entry ]
-
-=head1 Performance Enhancements
-
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
-
-[ List each enhancement as an =item entry ]
-
-=over 4
-
-=item *
-
-XXX
-
-=back
+If you are upgrading from an earlier release such as 5.31.0, first read
+L<perl5311delta>, which describes differences between 5.31.0 and 5.31.1.
=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.
-
-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 ]
-
-=head2 New Modules and Pragmata
-
-=over 4
-
-=item *
-
-XXX Remove this section if not applicable.
-
-=back
-
=head2 Updated Modules and Pragmata
=over 4
=item *
-L<perl5db.pl> has been upgraded from version 1.54 to 1.55.
-
-Debugging threaded code no longer deadlocks in C<DB::sub> nor
-C<DB::lsub>.
+L<Devel::PPPort> has been upgraded from version 3.53 to 3.54.
=item *
-L<PerlIO::encoding> has been upgraded from version 0.26 to 0.27.
-
-Warnings enabled by setting the C<WARN_ON_ERR> flag in
-C<$PerlIO::encoding::fallback> are now only produced if warnings are
-enabled with C<use warnings "utf8";> or setting C<$^W>.
+L<Exporter> has been upgraded from version 5.73 to 5.74.
=item *
-L<threads::shared> has been upgraded from version 1.59 to 1.60.
-
-Added support for extra tracing of locking, this requires a
-C<-DDEBUGGING> and extra compilation flags.
-
-=back
-
-=head2 Removed Modules and Pragmata
-
-=over 4
+L<IPC::Cmd> has been upgraded from version 1.02 to 1.04.
=item *
-XXX
+L<JSON::PP> has been upgraded from version 4.02 to 4.04.
-=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>
+=item *
-XXX Description of the purpose of the new file here
+L<Module::CoreList> has been upgraded from version 5.20190620 to 5.20190720.
-=head2 Changes to Existing Documentation
+=item *
-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>.
+L<Opcode> has been upgraded from version 1.43 to 1.44.
-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.
+=item *
-Additionally, the following selected changes have been made:
+L<PerlIO::encoding> has been upgraded from version 0.27 to 0.28.
-=head3 L<XXX>
+=item *
-=over 4
+L<Pod::Simple> has been upgraded from version 3.38 to 3.39.
=item *
-XXX Description of the change here
+L<threads::shared> has been upgraded from version 1.60 to 1.61.
=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
-
=head3 New Errors
=over 4
=item *
-XXX L<message|perldiag/"message">
-
-=back
-
-=head3 New Warnings
-
-=over 4
-
-=item *
+C<L<No digits found for %s literal|perldiag/"No digits found for %s literal">>
-XXX L<message|perldiag/"message">
+(F) No hexadecimal digits were found following C<0x> or no binary digits were
+found following C<0b>.
=back
=head2 Changes to Existing Diagnostics
-XXX Changes (i.e. rewording) of diagnostic messages go here
-
=over 4
=item *
-Specifying C<\o{}> without anything between the braces now yields the
-fatal error message "Empty \o{}". Previously it was "Number with no
-digits". This means the same wording is used for this kind of error as
-with similar constructs such as C<\p{}>.
-
-=back
-
-=head1 Utility Changes
-
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
-
-[ List utility changes as a =head2 entry for each utility and =item
-entries for each change
-Use L<XXX> with program names to get proper documentation linking. ]
-
-=head2 L<XXX>
-
-=over 4
-
-=item *
+C<\N{} here is restricted to one character> is now emitted in the same
+circumstances where previously C<\N{} in inverted character class or as
+a range end-point is restricted to one character> was.
-XXX
+This is due to new circumstances having been added in perl v5.30 that
+weren't covered by the earlier wording.
=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.
-
-[ List changes as an =item entry ].
-
=over 4
=item *
-XXX
-
-=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
+The C<ECHO> macro is now defined. This is used in a C<dtrace> rule
+that was originally changed for FreeBSD, and the FreeBSD make
+apparently predefines it. The Solaris make does not predefine C<ECHO>
+which broke this rule on Solaris. [perl #134218]
=item *
-XXX
+Bison versions 3.1 through 3.4 are now supported.
=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.
+=head2 Platform-Specific Notes
=over 4
-=item XXX-some-platform
-
-XXX
+=item Linux
-=back
-
-=head2 Discontinued Platforms
-
-XXX List any platforms that this version of perl no longer compiles on.
-
-=over 4
+C<cc> will be used to populate C<plibpth> if C<cc> is C<clang>. [perl
+#134189]
-=item XXX-some-platform
+=item VMS
-XXX
+C<-Duse64bitint> is now the default on VMS.
=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.
+=head1 Internal Changes
=over 4
-=item XXX-some-platform
-
-XXX
-
-=back
-
-=head1 Internal Changes
+=item *
-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.
+The PERL_DESTRUCT_LEVEL environment variable was formerly only honored on
+perl binaries built with DEBUGGING support. It is now checked on all perl
+builds. Its normal use is to force perl to individually free every block
+of memory which it has allocated before exiting, which is useful when
+using automated leak detection tools such as valgrind.
-[ List each change as an =item entry ]
+=item *
-=over 4
+The API eval_sv() now accepts a C<G_RETHROW> flag. If this flag is
+set and an exception is thrown while compiling or executing the
+supplied code, it will be rethrown, and eval_sv() will not return.
+[perl #134177]
=item *
-Added C<newSVsv_nomg()> to copy a SV without processing get magic on
-the source. [perl #132964]
+As part of the fix for [perl #2754] perl_parse() now returns non-zero
+if exit(0) is called in a C<BEGIN>, C<UNITCHECK> or C<CHECK> block.
=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<pack()> no longer can return malformed UTF-8. It croaks if it would
-otherwise return a UTF-8 string that contains malformed UTF-8. This
-protects agains potential security threats. [perl #131642]
+Parsing incomplete hex or binary literals was changed in 5.31.1 to
+treat such a literal as just the 0, leaving the following C<x> or C<b>
+to be parsed as part of the next token. This could lead to some
+silent changes in behaviour, so now incomplete hex or binary literals
+produce a fatal error. [perl #134125]
=item *
-See L</Any set of digits in the Common script are legal in a script run
-of another script>.
-
-=back
+eval_pv()'s I<croak_on_error> flag will now throw even if the
+exception is a false overloaded value. [perl #134177]
-=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 ]
+=item *
-=over 4
+C<INIT> blocks and the program itself are no longer run if exit(0) is
+called within a C<BEGIN>, C<UNITCHECK> or C<CHECK> block. [perl
+#2754]
=item *
-XXX
+C<<< open my $fh, ">>+", undef >>> now opens the temporary file in
+append mode - writes will seek to the end of file before writing.
+[perl #134221]
=back
-=head1 Errata From Previous Releases
+=head1 Known Problems
=over 4
=item *
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+The VC++ 6.0 build on Windows is currently broken.
-=back
+=item *
-=head1 Obituary
+Tests 9-11 in F<t/op/blocks.t> currently fail on Windows.
+[perl #134295]
-XXX If any significant core contributor or member of the CPAN community has
-died, add a short obituary here.
+=back
=head1 Acknowledgements
XXX Generate this with:
- perl Porting/acknowledgements.pl v5.29.8..HEAD
+ perl Porting/acknowledgements.pl v5.31.1..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff