+++ /dev/null
-=head1 NAME
-
-perldelta - what is new for perl v5.9.1
-
-=head1 DESCRIPTION
-
-This document describes differences between the 5.9.0 release and
-the 5.9.1 release.
-
-=head1 Incompatible Changes
-
-=head1 Core Enhancements
-
-=head2 Lexical C<$_>
-
-The default variable C<$_> can now be lexicalized, by declaring it like
-any other lexical variable, with a simple
-
- my $_;
-
-The operations that default on C<$_> will use the lexically-scoped
-version of C<$_> when it exists, instead of the global C<$_>.
-
-In a C<map> or a C<grep> block, if C<$_> was previously my'ed, then the
-C<$_> inside the block is lexical as well (and scoped to the block).
-
-In a scope where C<$_> has been lexicalized, you can still have access to
-the global version of C<$_> by using C<$::_>, or, more simply, by
-overriding the lexical declaration with C<our $_>.
-
-=head2 Tied hashes in scalar context
-
-As of perl 5.8.2, tied hashes did not return anything useful in scalar
-context, for example when used as boolean tests:
-
- if (%tied_hash) { ... }
-
-The old nonsensical behaviour was always to return false,
-regardless of whether the hash is empty or has elements.
-
-There is now an interface for the implementors of tied hashes to implement
-the behaviour of a hash in scalar context, via the SCALAR method (see
-L<perltie>). Without a SCALAR method, perl will try to guess whether
-the hash is empty, by testing if it's inside an iteration (in this case
-it can't be empty) or by calling FIRSTKEY.
-
-=head2 Formats
-
-Formats were improved in several ways. A new field, C<^*>, can be used for
-variable-width, one-line-at-a-time text. Null characters are now handled
-correctly in picture lines. Using C<@#> and C<~~> together will now
-produce a compile-time error, as those format fields are incompatible.
-L<perlform> has been improved, and miscellaneous bugs fixed.
-
-=head2 The C<:unique> attribute is only meaningful for globals
-
-Now applying C<:unique> to lexical variables and to subroutines will
-result in a compilation error.
-
-=head2 Stacked filetest operators
-
-As a new form of syntactic sugar, it's now possible to stack up filetest
-operators. You can now write C<-f -w -x $file> in a row to mean
-C<-x $file && -w _ && -f _>. See L<perlfunc/-X>.
-
-=head1 Modules and Pragmata
-
-=over 4
-
-=item Carp
-
-The error messages produced by C<Carp> now include spaces between the
-arguments in function argument lists: this makes long error messages
-appear more nicely in browsers and other tools.
-
-=item Exporter
-
-C<Exporter> will now recognize grouping tags (such as C<:name>) anywhere
-in the import list, not only at the beginning.
-
-=item FindBin
-
-A function C<again> is provided to resolve problems where modules in different
-directories wish to use FindBin.
-
-=item List::Util
-
-You can now weaken references to read only values.
-
-=item threads::shared
-
-C<cond_wait> has a new two argument form. C<cond_timedwait> has been added.
-
-=back
-
-=head1 Utility Changes
-
-C<find2perl> now assumes C<-print> as a default action. Previously, it
-needed to be specified explicitly.
-
-A new utility, C<prove>, makes it easy to run an individual regression test
-at the command line. C<prove> is part of Test::Harness, which users of earlier
-Perl versions can install from CPAN.
-
-=head1 Documentation
-
-The documentation has been revised in places to produce more standard manpages.
-
-The long-existing feature of C</(?{...})/> regexps setting C<$_> and pos()
-is now documented.
-
-=head1 Performance Enhancements
-
-=head1 Installation and Configuration Improvements
-
-=head1 Selected Bug Fixes
-
-=head2 UTF8 bugs
-
-Using substr() on a UTF8 string could cause subsequent accesses on that
-string to return garbage. This was due to incorrect UTF8 offsets being
-cached, and is now fixed.
-
-join() could return garbage when the same join() statement was used to
-process 8 bit data having earlier processed UTF8 data, due to the flags
-on that statement's temporary workspace not being reset correctly. This
-is now fixed.
-
-Using Unicode keys with tied hashes should now work correctly.
-
-chop() and chomp() used to mangle UTF8 strings. This has been fixed.
-
-=head2 Threading bugs
-
-Hashes with the C<:unique> attribute weren't made read-only in new
-threads. They are now.
-
-=head2 More bugs
-
-C<$a .. $b> will now work as expected when either $a or $b is C<undef>
-
-Reading $^E now preserves $!. Previously, the C code implementing $^E
-did not preserve C<errno>, so reading $^E could cause C<errno> and therefore
-C<$!> to change unexpectedly.
-
-Reentrant functions will (once more) work with C++. 5.8.2 introduced a bugfix
-which accidentally broke the compilation of Perl extensions written in C++
-
-=head1 New or Changed Diagnostics
-
-The fatal error "DESTROY created new reference to dead object" is now
-documented in L<perldiag>.
-
-A new error, "%ENV is aliased to %s", is produced when taint checks are
-enabled and when *ENV has been aliased (and thus doesn't reflect the
-program's environment anymore.)
-
-=head1 Changed Internals
-
-=head1 Configuration and Building
-
-C<Configure> now invokes callbacks regardless of the value of the variable
-they are called for. Previously callbacks were only invoked in the
-C<case $variable $define)> branch. This change should only affect platform
-maintainers writing configuration hints files.
-
-=head1 New Tests
-
-=head1 Known Problems
-
-=head1 Platform Specific Problems
-
-=head1 Reporting Bugs
-
-If you find what you think is a bug, you might check the articles
-recently posted to the comp.lang.perl.misc newsgroup and the perl
-bug database at http://bugs.perl.org/ . There may also be
-information at http://www.perl.com/ , the Perl Home Page.
-
-If you believe you have an unreported bug, please run the B<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.
-
-=head1 SEE ALSO
-
-The F<Changes> file for 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
https://perl5.git.perl.org / perl5.git / commitdiff