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[perl5.git] / pod / perldelta.pod

=encoding utf8

=head1 NAME

perldelta - what is new for perl v5.29.7

=head1 DESCRIPTION

This document describes differences between the 5.29.6 release and the 5.29.7
release.

If you are upgrading from an earlier release such as 5.29.5, first read
L<perl5296delta>, which describes differences between 5.29.5 and 5.29.6.

=head1 Deprecations

=head2 In XS code, use of various macros dealing with UTF-8.

This deprecation was scheduled to become fatal in 5.30, but has been
delayed to 5.32 due to problems that showed up with some CPAN modules.
For details of what's affected, see L<perldeprecation|
perldeprecation/In XS code, use of various macros dealing with UTF-8.>.

=head1 Performance Enhancements

=over 4

=item *

A handful of small optimizations related to character folding
and character classes in regular expressions.

=back

=head1 Modules and Pragmata

=head2 Updated Modules and Pragmata

=over 4

=item *

L<Compress::Raw::Bzip2> has been upgraded from version 2.081 to 2.084.

=item *

L<Compress::Raw::Zlib> has been upgraded from version 2.081 to 2.084.

=item *

L<CPAN> has been upgraded from version 2.21 to 2.22.

=item *

L<DB_File> has been upgraded from version 1.842 to 1.843.

=item *

L<File::Find> has been upgraded from version 1.35 to 1.36.

Variables C<< $Is_Win32 >> and C<< $Is_VMS >> are being initialized.

=item *

L<File::Spec> has been upgraded from version 3.76 to 3.77.

=item *

L<File::Temp> has been upgraded from version 0.2308 to 0.2309.

=item *

IO-Compress has been upgraded from version 2.081 to 2.084.

Adds support for C<< IO::Uncompress::Zstd >> and
C<< IO::Uncompress::UnLzip >>. 

The C<< BinModeIn >> and C<< BinModeOut >> options are now no-ops.
ALL files will be read/written in binmode.

=item *

L<lib> has been upgraded from version 0.64 to 0.65.

=item *

L<Math::BigInt> has been upgraded from version 1.999813 to 1.999816.

C<< bnok() >> now supports the full Kronenburg extension.
L<[cpan #95628]|https://rt.cpan.org/Ticket/Display.html?id=95628>.

=item *

L<Math::BigInt::FastCalc> has been upgraded from version 0.5007 to 0.5008.

=item *

L<Module::CoreList> has been upgraded from version 5.20181218 to 5.20190120.

=item *

L<Test::Simple> has been upgraded from version 1.302141 to 1.302160.

=item *

L<Unicode::Collate> has been upgraded from version 1.25 to 1.27.

=back

=head1 Documentation

=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>.

Additionally, the following selected changes have been made:

=head3 L<perlvar>

=over 4

=item *

More specific documentation of paragraph mode. L<[perl #133722]|https://rt.perl.org/Ticket/Display.html?id=133722>.

=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 Changes to Existing Diagnostics

=over 4

=item *

L<Prototype not terminated|perldiag/"Prototype not terminated">

The file and line number is now reported for this error.
L<[perl #133524]|https://rt.perl.org/Ticket/Display.html?id=133524>

=back

=head1 Testing

Tests were added and changed to reflect the other additions and
changes in this release.  Furthermore, these significant changes were
made:

=over 4

=item *

Fix intermittent tests which failed due to race conditions which
surface during parallel testing. L<[perl #133740]|https://rt.perl.org/Ticket/Display.html?id=133740>.

=item *

Thoroughly test paragraph mode, using a new test file,
F<t/io/paragraph_mode.t>. L<[perl #133722]|https://rt.perl.org/Ticket/Display.html?id=133722>.

=back

=head1 Selected Bug Fixes

=over 4

=item *

Fixed a failure to match properly.

An EXACTFish regnode has a finite length it can hold for the string
being matched.  If that length is exceeded, a second node is used for
the next segment of the string, for as many regnodes as are needed.
Care has to be taken where to break the string, in order to deal
multi-character folds in Unicode correctly. If we want to break a
string at a place which could potentially be in the middle of a
multi-character fold, we back off one (or more) characters, leaving
a shorter EXACTFish regnode. This backing off mechanism contained
an off-by-one error. L<[perl #133756]|https://rt.perl.org/Ticket/Display.html?id=133756>.

=item *

A bare C<eof> call with no previous file handle now returns true.
L<[perl #133721]|https://rt.perl.org/Ticket/Display.html?id=133721>

=item *

Failing to compile a format now aborts compilation.  Like other errors
in sub-parses this could leave the parser in a strange state, possibly
crashing perl if compilation continued.  L<[perl #132158]|https://rt.perl.org/Ticket/Display.html?id=132158>

=back

=head1 Acknowledgements

Perl 5.29.7 represents approximately 5 weeks of development since Perl
5.29.6 and contains approximately 97,000 lines of changes across 350 files
from 8 authors.

Excluding auto-generated files, documentation and release tools, there were
approximately 27,000 lines of changes to 190 .pm, .t, .c and .h files.

Perl continues to flourish into its fourth decade thanks to a vibrant
community of users and developers. The following people are known to have
contributed the improvements that became Perl 5.29.7:

Abigail, Chris 'BinGOs' Williams, Eugen Konkov, Hauke D, James E Keenan,
Karl Williamson, Tomasz Konojacki, Tony Cook.

The list above is almost certainly incomplete as it is automatically
generated from version control history. In particular, it does not include
the names of the (very much appreciated) contributors who reported issues to
the Perl bug tracker.

Many of the changes included in this version originated in the CPAN modules
included in Perl's core. We're grateful to the entire CPAN community for
helping Perl to flourish.

For a more complete list of all of Perl's historical contributors, please
see the F<AUTHORS> file in the Perl source distribution.

=head1 Reporting Bugs

If you find what you think is a bug, you might check the perl bug database
at L<https://rt.perl.org/>.  There may also be information at
L<http://www.perl.org/>, the Perl Home Page.

If you believe you have an unreported bug, please run the L<perlbug> program
included with your release.  Be sure to trim your bug down to a tiny but
sufficient test case.  Your bug report, along with the output of C<perl -V>,
will be sent off to perlbug@perl.org to be analysed by the Perl porting team.

If the bug you are reporting has security implications which make it
inappropriate to send to a publicly archived mailing list, then see
L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
for details of how to report the issue.

=head1 Give Thanks

If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
you can do so by running the C<perlthanks> program:

    perlthanks

This will send an email to the Perl 5 Porters list with your show of thanks.

=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