=head1 NAME
-perldelta - what is new for perl v5.17.8
+perldelta - what is new for perl v5.17.11
=head1 DESCRIPTION
-This document describes differences between the 5.17.7 release and the 5.17.8
+This document describes differences between the 5.17.10 release and the 5.17.11
release.
-If you are upgrading from an earlier release such as 5.17.6, first read
-L<perl5177delta>, which describes differences between 5.17.6 and 5.17.7.
-
-=head1 Core Enhancements
-
-=head2 Regular Expression Set Operations
-
-This is an experimental feature to allow matching against the the union,
-intersection, etc., of sets of code points, similar to
-L<Unicode::Regex::Set>. It can also be used to extend C</x> processing
-to [bracketed] character classes, and as a replacement of user-defined
-properties, allowing more complex expressions than they do. See
-L<perlre/(?[ ])>.
-
-=head1 Deprecations
-
-=head2 Deprecated modules
-
-The Pod::LaTeX module is now deprecated, and due to be moved out of the Perl
-core in 5.20. Until then, using the core-installed version will produce a
-warning. You can suppress the warning by installing the module from CPAN.
-
-=head2 User-defined charnames with surprising whitespace
-
-A user-defined character name with trailing or multiple spaces in a row is
-likely a typo. This now generates a warning when defined, on the assumption
-that uses of it will be unlikely to include the excess whitespace.
-
-=head2 Various XS-callable functions are now deprecated
-
-All the functions used to classify characters will be removed from a
-future version of Perl, and should not be used. With participating C
-compilers (e.g., gcc), compiling any file that uses any of these will
-generate a warning. These were not intended for public use; there are
-equivalent, faster, macros for most of them.
-See L<perlapi/Character classes>. The complete list (including some
-that were deprecated in 5.17.7) is:
-C<is_uni_alnum>, C<is_uni_alnumc>, C<is_uni_alnumc_lc>,
-C<is_uni_alnum_lc>, C<is_uni_alpha>, C<is_uni_alpha_lc>,
-C<is_uni_ascii>, C<is_uni_ascii_lc>, C<is_uni_blank>,
-C<is_uni_blank_lc>, C<is_uni_cntrl>, C<is_uni_cntrl_lc>,
-C<is_uni_digit>, C<is_uni_digit_lc>, C<is_uni_graph>,
-C<is_uni_graph_lc>, C<is_uni_idfirst>, C<is_uni_idfirst_lc>,
-C<is_uni_lower>, C<is_uni_lower_lc>, C<is_uni_print>,
-C<is_uni_print_lc>, C<is_uni_punct>, C<is_uni_punct_lc>,
-C<is_uni_space>, C<is_uni_space_lc>, C<is_uni_upper>,
-C<is_uni_upper_lc>, C<is_uni_xdigit>, C<is_uni_xdigit_lc>,
-C<is_utf8_alnum>, C<is_utf8_alnumc>, C<is_utf8_alpha>,
-C<is_utf8_ascii>, C<is_utf8_blank>, C<is_utf8_char>,
-C<is_utf8_cntrl>, C<is_utf8_digit>, C<is_utf8_graph>,
-C<is_utf8_idcont>, C<is_utf8_idfirst>, C<is_utf8_lower>,
-C<is_utf8_mark>, C<is_utf8_perl_space>, C<is_utf8_perl_word>,
-C<is_utf8_posix_digit>, C<is_utf8_print>, C<is_utf8_punct>,
-C<is_utf8_space>, C<is_utf8_upper>, C<is_utf8_xdigit>,
-C<is_utf8_xidcont>, C<is_utf8_xidfirst>.
-
-In addition these three functions that have never worked properly are
-deprecated:
-C<to_uni_lower_lc>, C<to_uni_title_lc>, and C<to_uni_upper_lc>.
-
-=head2 Certain rare uses of backslashes within regexes are now deprectated
-
-There are three pairs of characters that Perl recognizes as
-metacharacters in regular expression patterns: C<{}>, C<[]>, and C<()>.
-These can be used as well to delimit patterns, as in:
-
- m{foo}
- s(foo)(bar)
-
-Since they are metacharacters, they have special meaning to regular
-expression patterns, and it turns out that you can't turn off that
-special meaning by the normal means of preceding them with a backslash,
-if you use them, paired, within a pattern delimitted by them. For
-example, in
-
- m{foo\{1,3\}}
-
-the backslashes do not change the behavior, and this matches
-S<C<"f o">> followed by one to three more occurrences of C<"o">.
-
-Usages like this, where they are interpreted as metacharacters, are
-exceedingly rare; we think there are none, for example, in all of CPAN.
-Hence, this deprecation should affect very little code. It does give
-notice, however, that any such code needs to change, which will in turn
-allow us to change the behavior in future Perl versions so that the
-backslashes do have an effect, and without fear that we are silently
-breaking any existing code.
+If you are upgrading from an earlier release such as 5.17.9, first read
+L<perl51710delta>, which describes differences between 5.17.9 and 5.17.10.
+
+=head1 Incompatible Changes
+
+Although no major incompatibilities have been introduced, the "switch" family
+of features have been marked experimental and will now emit warnings. These
+are: the C<~~> operator, C<given>, and C<when>.
=head1 Modules and Pragmata
-=head2 Selected Updates to Modules and Pragmata
+=head2 Updated Modules and Pragmata
=over 4
=item *
-Several modules have had their version number changed to one with no
-underscore, since such version numbers are usually interpreted to mean
-"development-only version". No other changes have been made in these cases.
-The affected modules are:
+Fixed the merge of ExtUtils-MakeMaker 6.65_01 to remove an excluded
+file. This was causing a test failure on Win32 [perl #117477]
-=over 4
+=item *
+
+B::Deparse has been upgraded from version 1.19 to 1.20, adding stub deparsing
+for lexical subroutines.
=item *
-L<I18N::Langinfo> was 0.08_02 and is now 0.09
+bigint has been upgraded from version 0.33 to 0.34.
=item *
-L<I18N::LangTags::List> was 0.35_01 and is now 0.39
+CPAN has been upgraded from its trial 2.00 release to its final 2.00 release.
=item *
-L<IO> was 1.25_08 and is now 1.26
+Exporter has been upgraded from version 5.67 to 5.68.
=item *
-L<Safe> was 2.33_01 and is now 2.34
+ExtUtils::CBuilder has been upgraded from version 0.280209 to 0.280210.
=item *
-L<Test> was 1.25_02 and is now 1.26.
+ExtUtils::MakeMaker has been upgraded from version 6.65_01 to 6.66.
-=back
+=item *
+
+IO has been upgraded from version 1.27 to 1.28.
=item *
-L<Digest::SHA> has been upgraded from version 5.80 to 5.81. This fixes a
-double-free bug, which might have caused vulnerabilities in some cases.
+overload has been upgraded from version 1.21 to 1.22.
=item *
-L<Socket> has been upgraded from 2.006_001 to 2.009. This fixes an
-uninitialized memory read.
+Storable has been upgraded from version 2.40 to 2.41.
+
+=item *
+
+warnings has been upgraded from version 1.17 to 1.18.
=back
+=head2 Changes to Existing Documentation
+
+=head3 Asian-language documentation
+
+The Asian-language documentation, previously stored in a few different
+encodings, have been transcoded to UTF-8.
+
=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
-
=head3 New Warnings
=over 4
=item *
-L<'%s' resolved to '\o{%s}%d'|perldiag/"'%s' resolved to '\o{%s}%d'">
-
-=item *
-
-L<'Trailing white-space in a charnames alias definition is deprecated'|perldiag/"Trailing white-space in a charnames alias definition is deprecated">
-
-=item *
-
-L<'A sequence of multiple spaces in a charnames alias definition is deprecated'|perldiag/"A sequence of multiple spaces in a charnames alias definition is deprecated">
-
-=item *
-
-L<'Passing malformed UTF-8 to "%s" is deprecated'|perldiag/"Passing malformed UTF-8 to "%s" is deprecated">
-
-=back
-
-=head1 Testing
-
-=over 4
+L<Smartmatch is experimental|perldiag/"Smartmatch is experimental">
=item *
-Many more of the core's tests now have descriptions.
+L<given is experimental|perldiag/"given is experimental">
=item *
-Thread stress-tests now adapt to the speed of the machine running the tests,
-thus reducing the incidence of false failures.
+L<when is experimental|perldiag/"when is experimental">
=back
=head1 Platform Support
-=head2 Discontinued Platforms
-
-=over 4
-
-=item Rhapsody
-
-Support for Rhapsody has been removed.
-
-=back
-
=head2 Platform-Specific Notes
=over 4
-=item Windows
-
-Perl can now be built using Microsoft's Visual C++ 2012 compiler by specifying
-CCTYPE=MSVC110 (or MSVC110FREE if you are using the free Express edition for
-Windows Desktop) in F<win32/Makefile>.
-
-=item Haiku
-
-Perl should now work out of the box on Haiku R1 Alpha 4.
-
-=back
-
-=head1 Internal Changes
-
-=over 4
+=item VMS
-=item *
+As of 5.18.0, Perl on VMS can (at last) be built in and installed from a
+directory having dots in the name, so it is no longer necessary to rename the
+top-level source directory before building.
-A synonym for the misleadingly named C<av_len()> has been created:
-C<av_top()>. Both of these return the number of the highest index in
-the array, not the number of elements it contains.
+The pertinent instructions have been removed from README.vms, so we also no
+longer need to update the version number that was embedded in those
+instructions.
=back
=over 4
-=item *
-
-A bug in the core typemap caused any C types that map to the T_BOOL core
-typemap entry to not be set, updated, or modified when the T_BOOL variable was
-used in an OUTPUT: section with an exception for RETVAL. T_BOOL in an INPUT:
-section was not affected. Using a T_BOOL return type for an XSUB (RETVAL)
-was not affected. A side effect of fixing this bug is, if a T_BOOL is specified
-in the OUTPUT: section (which previous did nothing to the SV), and a read only
-SV (literal) is passed to the XSUB, croaks like "Modification of a read-only
-value attempted" will happen. [perl #115796]
-
-=item *
-
-On many platforms, providing a directory name as the script name caused perl
-to do nothing and report success. It should now universally report an error
-and exit nonzero. [perl #61362]
+=item Make vms.c's Perl_flex_fstat preserve errno on success
-=back
-
-=head1 Known Problems
+=item split's first argument is more consistently interpreted
-=over 4
+After some changes earlier in 5.17, C<split>'s behavior has been simplified: if
+the PATTERN argument evaluates to a literal string containing one space, it is
+treated the way that a I<literal> string containing one space once was.
-=item *
-
-Perl 5.17.7 introduced a new internal copy-on-write mechanism, in the
-interests of speed. An flaw in the implementation means that some regexp
-matches which previously completed very fast, without invoking the full
-regexp engine, now run much slower than before. We expect this performance
-problem to be resolved before 5.18.0 is released.
-
-=item *
+=item Handle overloading properly in compile-time regex
-The C<POSIX> module may yield test failures when building on a ZFS
-filesystem under FreeBSD.
+C<(?{…})> and C<qr> constant overloading did not play nicely together, and when
+C<qr> constant overloading was in effect, C<qr> constructs inside a C<(?{…})>
+construct were incorrectly interpreted. [perl #116823]
=back
=head1 Acknowledgements
-Perl 5.17.8 represents approximately 5 weeks of development since Perl 5.17.7
-and contains approximately 18,000 lines of changes across 280 files from 24
+Perl 5.17.11 represents approximately 4 weeks of development since Perl 5.17.10
+and contains approximately 3,800 lines of changes across 130 files from 17
authors.
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 5.17.8:
+improvements that became Perl 5.17.11:
-Aaron Crane, Andy Dougherty, Augustina Blair, Chris 'BinGOs' Williams, Craig
-A. Berry, Daniel Dragan, Dave Rolsky, David Mitchell, Eric Brine, Father
-Chrysostomos, H.Merijn Brand, James E Keenan, Jerry D. Hedden, Jesse Luehrs,
-Karl Williamson, Matthew Horsfall, Nicholas Clark, Renee Baecker, Ricardo
-Signes, Shlomi Fish, Steffen Müller, Steve Hay, Steven Schubiger, Tony Cook.
+Aaron Crane, Andy Dougherty, Brian Fraser, Chris 'BinGOs' Williams, Craig A.
+Berry, David Mitchell, François Perrad, James E Keenan, Jan Dubois, Karl
+Williamson, Leon Timmermans, Max Maischein, Moritz Lenz, Nicholas Clark,
+Ricardo Signes, Tony Cook, Yves Orton.
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
https://perl5.git.perl.org / perl5.git / blobdiff