=head1 NAME
-perldelta - what is new for perl v5.15.0
+[ this is a template for a new perldelta file. Any text flagged as
+XXX needs to be processed before release. ]
-=head1 DESCRIPTION
-
-This document describes differences between the 5.15.0 release and
-the 5.14.0 release.
-
-If you are upgrading from an earlier release such as 5.12.0, first read
-L<perl5140delta>, which describes differences between 5.12.0 and
-5.14.0.
-
-Some of the changes have been included in Perl 5.14.1. These are
-indicated with a "(5.14.1)" marker.
-
-=head1 Core Enhancements
-
-=head2 C<CORE::> works on all keywords
-
-The C<CORE::> prefix can now be used on keywords enabled by
-L<feature.pm|feature>, even outside the scope of C<use feature>. Relevant
-documentation files L<CORE>, L<feature>, L<perlfunc>, L<perlsub>, and
-L<perlsyn> have been updated.
-
-=head2 C<continue> no longer requires the "switch" feature
-
-The C<continue> keyword has two meanings. It can introduce a C<continue>
-block after a loop, or it can exit the current C<when> block. Up till now,
-the latter meaning was only valid with the "switch" feature enabled, and
-was a syntax error otherwise. Since the main purpose of feature.pm is to
-avoid conflicts with user-defined subroutines, there is no reason for
-C<continue> to depend on it.
-
-=head2 C<$$> can be assigned to
-
-C<$$> was made read-only in Perl 5.8.0. But only sometimes: C<local $$>
-would make it writable again. Some CPAN modules were using C<local $$> or
-XS code to bypass the read-only check, so there is no reason to keep C<$$>
-read-only. (This change also allowed a bug to be fixed while maintaining
-backward compatibility.)
-
-=head2 Features inside the debugger
-
-The current Perl's feature bundle is now enabled for commands entered in
-the interactive debugger.
-
-=head2 C<\N{...}> can now have Unicode loose name matching
-
-This is described in the C<charnames> item in
-L</Updated Modules and Pragmata> below.
-
-=head2 Breakpoints with file names
-
-The debugger's "b" command for setting breakpoints now allows a line number
-to be prefixed with a file name. See
-L<perldebug/"b [file]:[line] [condition]">.
-
-=head1 Security
-
-No changes since 5.14.0.
-
-=head1 Incompatible Changes
-
-=head2 Tying scalars that hold typeglobs
-
-Attempting to tie a scalar after a typeglob was assigned to it would
-instead tie the handle in the typeglob's IO slot. This meant that it was
-impossible to tie the scalar itself. Similar problems affected C<tied> and
-C<untie>: C<tied $scalar> would return false on a tied scalar if the last
-thing returned was a typeglob, and C<untie $scalar> on such a tied scalar
-would do nothing.
-
-We fixed this problem before Perl 5.14.0, but it caused problems with some
-CPAN modules, so we put in a deprecation cycle instead.
-
-Now the deprecation has been removed and this bug has been fixed. So
-C<tie $scalar> will always tie the scalar, not the handle it holds. To tie
-the handle, use C<tie *$scalar> (with an explicit asterisk). The same
-applies to C<tied *$scalar> and C<untie *$scalar>.
-
-=head2 IPC::Open3 no longer provides C<xfork()>, C<xclose_on_exec()>
-and C<xpipe_anon()>
-
-All three functions were private, undocumented and unexported. They do
-not appear to be used by any code on CPAN. Two have been inlined and one
-deleted entirely.
-
-=head2 C<$$> no longer caches PID
-
-Previously, if one embeds Perl or uses XS and calls fork(3) from C, Perls
-notion of C<$$> could go out of sync with what getpid() returns. By always
-fetching the value of C<$$> via getpid(), this potential bug is eliminated.
-Code that depends on the caching behavior will break. As described in
-L</Core Enhancements>, C<$$> is now writable, but it will be reset during a
-fork.
-
-=head1 Deprecations
-
-There have been no deprecations since 5.14.0.
-
-=head1 Performance Enhancements
-
-There are no benchmarked enhancements since 5.14.0.
-
-=head1 Modules and Pragmata
-
-=head2 New Modules and Pragmata
-
-None.
-
-=head2 Updated Modules and Pragmata
-
-=over 4
-
-=item *
-
-L<charnames> has been updated from version 1.18 to version 1.22
-
-L<charnames> can now be invoked with a new option, C<:loose>,
-which is like the existing C<:full> option, but enables Unicode loose
-name matching. Details are in L<charnames/LOOSE MATCHES>.
-
-=item *
-
-L<constant> has been updated from version 1.21 to 1.22.
-
-=item *
-
-L<Archive::Extract> has been upgraded from version 0.48 to version 0.52
-
-Includes a fix for FreeBSD to only use C<unzip> if it is located in
-C</usr/local/bin>, as FreeBSD 9.0 will ship with a limited C<unzip> in
-C</usr/bin>.
-
-=item *
-
-L<Attribute::Handlers> updated from version 0.88 to 0.91
-
-=item *
-
-L<B> has been upgraded from version 1.29 to version 1.30.
-
-=item *
-
-L<B::Deparse> has been upgraded from version 1.03 to 1.05. (Perl 5.14.1
-had version 1.04.)
-
-It addresses two regressions in Perl 5.14.0:
-
-=over
-
-=item *
-
-Deparsing of the C<glob> operator and its diamond (C<< <> >>) form now
-works again [perl #90898] (5.14.1).
-
-=item *
-
-The presence of subroutines named C<::::> or C<::::::> no longer causes
-B::Deparse to hang (5.14.1).
-
-=back
-
-Plus a few other bugs:
-
-=over
-
-=item *
-
-Deparsing of handle C<keys>, C<each> and C<value> with a scalar argument
-now works [perl #91008].
-
-=item *
-
-C<readpipe> followed by a complex expression (as opposed to a simple scalar
-variable) now works.
-
-=item *
-
-It now puts C<CORE::> in front of overridable core keywords if they
-conflict with user-defined subroutines.
-
-=item *
-
-Deparsing assignment to an lvalue method specified as a variable
-(C<< $obj->$method = ... >>) used not to work [perl #62498].
-
-=back
-
-=item *
-
-L<CGI> has been upgraded from version 3.52 to version 3.54
-
-The DELETE HTTP verb is now supported.
-
-=item *
-
-L<Compress::Zlib> has been upgraded from version 2.033 to version 2.035
-
-=item *
-
-L<Compress::Raw::Bzip2> has been upgraded from version 2.033 to version 2.035
-
-=item *
-
-L<Compress::Raw::Zlib> has been upgraded from version 2.033 to version 2.035
-
-=item *
-
-L<CPAN::Meta> has been upgraded from version 2.110440 to version 2.110930
-
-=item *
-
-L<CPANPLUS> has been upgraded from version 0.9103 to version 0.9105
-
-Now understands specifying modules to install in the format 'Module/Type.pm'
-
-=item *
-
-L<CPANPLUS::Dist::Build> has been upgraded from version 0.54 to version 0.56
-
-=item *
-
-L<Data::Dumper> has been upgraded from version 2.128 to 2.131.
-
-=item *
-
-L<DB_File> has been upgraded from version 1.821 to version 1.822
-
-Warnings are now in sync with perl's
-
-=item *
-
-L<Digest::SHA> has been upgraded from version 5.61 to version 5.62
-
-No longer loads L<MIME::Base64> as this was unnecessary.
-
-=item *
-
-L<Devel::Peek> has been upgraded from version 1.07 to 1.08.
-
-Its C<fill_mstats> function no longer refuses to write to copy-on-write
-scalars.
-
-=item *
-
-L<Encode> has been upgraded from version 2.42 to version 2.43
-
-Missing aliases added, a deep recursion error fixed and various
-documentation updates.
-
-=item *
-
-L<ExtUtils::CBuilder> updated from version 0.280203 to 0.280204. The new version
-append CFLAGS and LDFLAGS to their Config.pm counterparts.
-
-=item *
-
-L<Filter::Util::Call> has been upgraded from version 1.08 to version 1.39
-
-C<decrypt> fixed to work with v5.14.0
-
-=item *
-
-L<Filter::Simple> updated from version 0.85 to 0.87
-
-=item *
-
-L<FindBin> updated from version 1.50 to 1.51.
-
-It no longer returns a wrong result if a script of the same name as the
-current one exists in the path and is executable.
-
-=item *
-
-L<JSON::PP> has been upgraded from version 2.27105 to version 2.27200
-
-Fixed C<incr_parse> decoding string more correctly.
-
-=item *
-
-L<I18N::LangTags> has been upgraded from version 0.35_01 to version 0.36.
-
-Fix broken URLs for RFCs.
-
-=item *
-
-L<IPC::Open3> has been upgraded from version 1.10 to version 1.11.
-
-=over 4
-
-=item *
-
-Fixes a bug which prevented use of C<open3> on Windows when C<*STDIN>,
-C<*STDOUT> or C<*STDERR> had been localized.
-
-=item *
-
-Fixes a bug which prevented duplicating numeric file descriptors on Windows.
-
-=back
-
-=item *
-
-L<Math::BigFloat> has been upgraded from version 1.993 to 1.994.
-
-The C<numify> method has been corrected to return a normalised Perl number
-(the result of C<0 + $thing>), instead of a string [rt.cpan.org #66732].
-
-=item *
-
-L<Math::BigInt> has been upgraded from version 1.994 to 1.995.
-
-It provides a new C<bsgn> method that complements the C<babs> method.
-
-It fixes the internal C<objectify> function's handling of "foreign objects"
-so they are converted to the appropriate class (Math::BigInt or
-Math::BigFloat).
-
-=item *
-
-L<Math::Complex> has been upgraded from version 1.56 to version 1.57
-and L<Math::Trig> has been upgraded from version 1.20 to version 1.21.
-
-Fixes include: correct copy constructor usage; fix polarwise formatting with
-numeric format specifier; and more stable C<great_circle_direction> algorithm.
-
-=item *
-
-L<Module::CoreList> has been upgraded from version 2.49 to 2.51.
-
-Updated for v5.12.4, v5.14.1 and v5.15.0
-
-=item *
-
-L<mro> has been updated to remove two broken URLs in the documentation.
-
-=item *
-
-L<Object::Accessor> has been upgraded from version 0.38 to version 0.42
-
-Eliminated use of C<exists> on array elements which has been deprecated.
-
-=item *
-
-L<ODBM_File> has been upgraded from version 1.10 to version 1.11.
-
-The XS code is now compiled with C<PERL_NO_GET_CONTEXT>, which will aid
-performance under ithreads.
-
-=item *
-
-L<PerlIO::encoding> has been upgraded from version 0.14 to 0.15
-
-=item *
-
-L<PerlIO::scalar> has been upgraded from version 0.11 to 0.12.
-
-It fixes a problem with C<< open my $fh, ">", \$scalar >> not working if
-C<$scalar> is a copy-on-write scalar.
-
-It also fixes a hang that occurs with C<readline> or C<< <$fh> >> if a
-typeglob has been assigned to $scalar [perl #92258].
-
-=item *
-
-L<Pod::Perldoc> has been upgraded from version 3.15_03 to 3.15_05.
-
-It corrects the search paths on VMS [perl #90640]. (5.14.1)
-
-=item *
-
-L<Storable> has been upgraded from version 2.27 to version 2.28.
-
-It no longer turns copy-on-write scalars into read-only scalars when
-freezing and thawing.
-
-=item *
-
-L<Sys::Syslog> has been upgraded from version 0.27 to version 0.29
-
-Large number of Request Tickets resolved.
-
-=item *
-
-L<Time::HiRes> has been upgraded from version 1.9721_01 to version 1.9722.
-
-Portability fix, and avoiding some compiler warnings.
-
-=item *
-
-L<Unicode::Collate> has been upgraded from version 0.73 to version 0.76
-
-Updated to CLDR 1.9.1
-
-=item *
-
-L<Unicode::Normalize> has been upgraded from version 1.10 to version 1.12
-
-Fixes for the removal of F<unicore/CompositionExclusions.txt> from core.
-
-=item *
-
-L<XSLoader> has been upgraded from version 0.13 to version 0.15
-
-=back
-
-=head2 Removed Modules and Pragmata
-
-As promised in Perl 5.14.0's release notes, the following modules have
-been removed from the core distribution, and if needed should be installed
-from CPAN instead.
-
-=over
-
-=item *
-
-C<Devel::DProf> has been removed from the Perl core. Prior version was 20110228.00.
-
-=item *
-
-C<Shell> has been removed from the Perl core. Prior version was 0.72_01.
-
-=back
-
-=head1 Documentation
-
-=head2 New Documentation
-
-None.
-
-=head2 Changes to Existing Documentation
-
-=head3 L<perlfork>
-
-=over
-
-=item *
-
-Added portability caveats related to using C<kill> on forked process.
-
-=back
-
-=head3 L<perlfunc>
-
-=over
-
-=item *
-
-Documentation for C<use> now includes a pointer to F<if.pm> (5.14.1)
-
-=item *
-
-C<given>, C<when> and C<default> are now listed in L<perlfunc> (5.14.1).
-
-=item *
-
-The examples for the C<select> function no longer use strings for file
-handles.
+perldelta - what is new for perl v5.15.1
-=back
-
-=head3 L<perlguts>
-
-=over
-
-=item *
-
-Some of the function descriptions in L<perlguts> were confusing, as it was
-not clear whether they referred to the function above or below the
-description. This has been clarified [perl #91790].
-
-=back
+=head1 DESCRIPTION
-=head3 L<perllol>
+This document describes differences between the 5.15.1 release and
+the 5.15.0 release.
-=over
+If you are upgrading from an earlier release such as 5.14.0, first read
+L<perl5150delta>, which describes differences between 5.14.0 and
+5.15.0.
-=item *
+=head1 Notice
-L<perllol> has been expanded with examples using the new C<push $scalar>
-syntax introduced in Perl 5.14.0 (5.14.1).
+XXX Any important notices here
-=back
+=head1 Core Enhancements
-=head3 L<perlmod>
+XXX New core language features go here. Summarise user-visible core language
+enhancements. Particularly prominent performance optimisations could go
+here, but most should go in the L</Performance Enhancements> section.
-=over
+[ List each enhancement as a =head2 entry ]
-=item *
+=head2 C<splice()> doesn't warn when truncating
-L<perlmod> now states explicitly that some types of explicit symbol table
-manipulation are not supported. This codifies what was effectively already
-the case [perl #78074].
+You can now limit the size of an array using C<splice(@a,MAX_LEN)> without
+worrying about warnings.
-=back
+=head1 Security
-=head3 L<perlop>
+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.
-=over 4
+[ List each security issue as a =head2 entry ]
-=item *
+=head1 Incompatible Changes
-The explanation of bitwise operators has been expanded to explain how they
-work on Unicode strings (5.14.1).
+XXX For a release on a stable branch, this section aspires to be:
-=item *
+ There are no changes intentionally incompatible with 5.XXX.XXX
+ If any exist, they are bugs and reports are welcome.
-The section on the triple-dot or yada-yada operator has been moved up, as
-it used to separate two closely related sections about the comma operator
-(5.14.1).
+[ List each incompatible change as a =head2 entry ]
-=item *
+=head1 Deprecations
-More examples for C<m//g> have been added (5.14.1).
+XXX Any deprecated features, syntax, modules etc. should be listed here.
+In particular, deprecated modules should be listed here even if they are
+listed as an updated module in the L</Modules and Pragmata> section.
-=item *
+[ List each deprecation as a =head2 entry ]
-The C<<< <<\FOO >>> here-doc syntax has been documented (5.14.1).
+=head1 Performance Enhancements
-=back
+XXX Changes which enhance performance without changing behaviour go here. There
+may well be none in a stable release.
-=head3 L<perlpodstyle>
+[ List each enhancement as a =item entry ]
=over 4
=item *
-The tips on which formatting codes to use have been corrected and greatly
-expanded.
-
-=item *
-
-There are now a couple of example one-liners for previewing POD files after
-they have been edited.
+XXX
=back
-=head3 L<perlsub>
-
-=over
-
-=item *
+=head1 Modules and Pragmata
-The L<perlsub/"Lvalue subroutines"> section has been amended to reflect
-changes and bug fixes introduced in Perl 5.15.0.
+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>, which prints stub
+entries to STDOUT. Results can be pasted in place of the '=head2' entries
+below. 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.
-=back
+[ Within each section, list entries as a =item entry ]
-=head3 L<perlre>
+=head2 New Modules and Pragmata
-=over
+=over 4
=item *
-The C<(*COMMIT)> directive is now listed in the right section
-(L<Verbs without an argument|perlre/Verbs without an argument>).
+XXX
=back
-=head3 L<perlrun>
+=head2 Updated Modules and Pragmata
-=over
+=over 4
=item *
-L<perlrun> has undergone a significant clean-up. Most notably, the
-B<-0x...> form of the B<-0> flag has been clarified, and the final section
-on environment variables has been corrected and expanded (5.14.1).
+L<XXX> has been upgraded from version 0.69 to version 0.70.
=back
-=head3 L<perltie>
+=head2 Removed Modules and Pragmata
-=over
+=over 4
=item *
-Documented the required syntax for tying handles.
+XXX
=back
-=head3 L<perlvar>
+=head1 Documentation
-=over
+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>.
-=item *
+=head2 New Documentation
-The documentation for L<$!|perlvar/$!> has been corrected and clarified.
-It used to state that $! could be C<undef>, which is not the case. It was
-also unclear as to whether system calls set C's C<errno> or Perl's C<$!>
-[perl #91614].
+XXX Changes which create B<new> files in F<pod/> go here.
-=item *
+=head3 L<XXX>
-Documentation for L<$$|perlvar/$$> has been amended with additional
-cautions regarding changing the process ID.
+XXX Description of the purpose of the new file here
-=back
+=head2 Changes to Existing Documentation
-=head3 L<POSIX>
+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.
-=over
+=head3 L<XXX>
+
+=over 4
=item *
-The invocation documentation for C<WIFEXITED>, C<WEXITSTATUS>,
-C<WIFSIGNALED>, C<WTERMSIG>, C<WIFSTOPPED>, and C<WSTOPSIG> has been
-corrected (5.14.1).
+XXX Description of the change here
=back
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<Useless assignment to a temporary|perldiag/"Useless assignment to a temporary">
+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.
-Assigning to a temporary returned from an XS lvalue subroutine now produces a
-warning [perl #31946].
+[ Within each section, list entries as a =item entry that links to perldiag,
+ e.g.
-=back
-
-=head2 Changes to Existing Diagnostics
+ =item *
-None.
+ L<Invalid version object|perldiag/"Invalid version object">
+]
-=head1 Utility Changes
+=head2 New Diagnostics
-None.
+XXX Newly added diagnostic messages go here
-=head1 Configuration and Compilation
+=head3 New Errors
=over 4
=item *
-F<regexp.h> has been modified for compatibility with GCC's B<-Werror>
-option, as used by some projects that include perl's header files (5.14.1).
-
-=item *
-
-USE_LOCALE{,_COLLATE,_CTYPE,_NUMERIC} have been added the output of perl -V
-as they have affect the behaviour of the interpreter binary (albeit only
-in a small area).
-
-=item *
-
-The code and tests for L<IPC::Open2> have been moved from F<ext/IPC-Open2>
-into F<ext/IPC-Open3>, as C<IPC::Open2::open2()> is implemented as a thin
-wrapper around C<IPC::Open3::_open3()>, and hence is very tightly coupled to
-it.
-
-=item *
-
-The magic types and magic vtables are now generated from data in a new script
-F<regen/mg_vtable.pl>, instead of being maintained by hand. As different EBCDIC
-variants can't agree on the code point for '~', the character to code point
-conversion is done at build time by F<generate_uudmap> to a new generated header
-F<mg_data.h>. C<PL_vtbl_bm> and C<PL_vtbl_fm> are now defined by the
-pre-processor as C<PL_vtbl_regexp>, instead of being distinct C variables.
-C<PL_vtbl_sig> has been removed.
-
-=item *
-
-Building with C<-DPERL_GLOBAL_STRUCT> works again. This configuration is not
-generally used.
-
-=item *
-
-Perl configured with I<MAD> now correctly frees C<MADPROP> structures when
-OPs are freed. C<MADPROP>s are now allocated with C<PerlMemShared_malloc()>
-
-=back
-
-=head1 Testing
-
-There have been no significant changes to the process for testing a
-newly-built perl.
-
-See the source code commit history for changes to individual test files.
-
-=head1 Platform Support
-
-=head2 New Platforms
-
-None.
-
-=head2 Discontinued Platforms
-
-None.
-
-=head2 Platform-Specific Notes
-
-=head3 GNU/Hurd
-
-=over
-
-=item *
-
-No longer overrides possible extra $ccflags values given to Configure
-on GNU/Hurd. C.f. Bug-Debian: http://bugs.debian.org/587901
-
-=back
-
-=head3 Mac OS X
-
-=over
-
-=item *
-
-Clarified Apple Developer Tools requirements in F<README.macosx>
-
-=item *
-
-Mac OS X specific compilation instructions have been clarified (5.14.1)
+XXX L<message|perldiag/"message">
=back
-=head3 MSWin32
+=head3 New Warnings
-=over
+=over 4
=item *
-Supplied F<makefile.mk> patched to support gcc-4.x.x and README.win32
-updated accordingly. [perl #91354]
+XXX L<message|perldiag/"message">
=back
-=head3 Solaris
-
-=over
-
-=item *
-
-Updated the list of required packages for building perl to reflect Solaris 9
-and 10 in README.solaris [perl #90850] (5.14.1)
-
-=back
+=head2 Changes to Existing Diagnostics
-=head3 Ubuntu Linux
+XXX Changes (i.e. rewording) of diagnostic messages go here
=over 4
=item *
-The L<ODBM_File> installation process has been updated with the new library
-paths on Ubuntu natty [perl #90106] (5.14.1)
-
-=item *
-
-I<h2ph> now gets the include paths from gcc correctly. This stopped
-working when Ubuntu switched to a "multiarch" setup [perl #90122].
+XXX Describe change here
=back
-=head1 Internal Changes
-
-=over 4
-
-=item *
-
-The compiled representation of formats is now stored via the C<mg_ptr> of
-their C<PERL_MAGIC_fm>. Previously it was stored in the string buffer,
-beyond C<SvLEN()>, the regular end of the string. C<SvCOMPILED()> and
-C<SvCOMPILED_{on,off}()> now exist solely for compatibility for XS code.
-The first is always 0, the other two now no-ops. (5.14.1)
-
-=item *
-
-Some global variables have been marked C<const>, members in the interpreter
-structure have been re-ordered, and the opcodes have been re-ordered. The op
-C<OP_AELEMFAST> has been split into C<OP_AELEMFAST> and C<OP_AELEMFAST_LEX>.
+=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 directories F<utils> and F<x2p>.
-When empting a hash of its elements (e.g. via undef(%h), or %h=()), HvARRAY
-field is no longer temporarily zeroed. Any destructors called on the freed
-elements see the remaining elements. Thus, %h=() becomes more like C<delete
-$h{$_} for keys %h>.
+[ List utility changes as a =head3 entry for each utility and =item
+entries for each change
+Use L<XXX> with program names to get proper documentation linking. ]
-=item *
+=head3 L<XXX>
-Boyer-Moore compiled scalars are now PVMGs, and the Boyer-Moore tables are now
-stored via the mg_ptr of their C<PERL_MAGIC_bm>. Previously they were PVGVs,
-with the tables stored in the string buffer, beyond C<SvLEN()>. This eliminates
-the last place where the core stores data beyond C<SvLEN()>.
+=over 4
=item *
-Simplified logic in C<Perl_sv_magic()> introduces a small change of
-behaviour for error cases involving unknown magic types. Previously, if
-C<Perl_sv_magic()> was passed a magic type unknown to it, it would
-
-=over
-
-=item 1.
-
-Croak "Modification of a read-only value attempted" if read only
-
-=item 2.
-
-Return without error if the SV happened to already have this magic
-
-=item 3.
-
-otherwise croak "Don't know how to handle magic of type \\%o"
+XXX
=back
-Now it will always croak "Don't know how to handle magic of type \\%o", even
-on read only values, or SVs which already have the unknown magic type.
-
-=back
+=head1 Configuration and Compilation
-=head1 Selected Bug Fixes
+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.
-=head2 Regular expressions and character classes
+[ List changes as a =item entry ].
=over 4
=item *
-The new (in 5.14.0) regular expression modifier C</a> when repeated like
-C</aa> forbids the characters outside the ASCII range that match
-characters inside that range from matching under C</i>. This did not
-work under some circumstances, all involving alternation, such as:
-
- "\N{KELVIN SIGN}" =~ /k|foo/iaa;
-
-succeeded inappropriately. This is now fixed.
-
-=item *
-
-5.14.0 introduced some memory leaks in regular expression character
-classes such as C<[\w\s]>, which have now been fixed (5.14.1)
-
-=item *
-
-An edge case in regular expression matching could potentially loop.
-This happened only under C</i> in bracketed character classes that have
-characters with multi-character folds, and the target string to match
-against includes the first portion of the fold, followed by another
-character that has a multi-character fold that begins with the remaining
-portion of the fold, plus some more.
-
- "s\N{U+DF}" =~ /[\x{DF}foo]/i
-
-is one such case. C<\xDF> folds to C<"ss">. (5.14.1)
-
-=item *
-
-A few characters in regular expression pattern matches did not
-match correctly in some circumstances, all involving C</i>. The
-affected characters are:
-COMBINING GREEK YPOGEGRAMMENI,
-GREEK CAPITAL LETTER IOTA,
-GREEK CAPITAL LETTER UPSILON,
-GREEK PROSGEGRAMMENI,
-GREEK SMALL LETTER IOTA WITH DIALYTIKA AND OXIA,
-GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS,
-GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND OXIA,
-GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS,
-LATIN SMALL LETTER LONG S,
-LATIN SMALL LIGATURE LONG S T,
-and
-LATIN SMALL LIGATURE ST.
-
-=item *
-
-Fixed memory leak regression in regular expression compilation
-under threading
+XXX
=back
-=head2 Formats
+=head1 Testing
-=over
+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 summarising, although the bugs
+that they represent may be covered elsewhere.
-=item *
+[ List each test improvement as a =item entry ]
-A number of edge cases have been fixed with formats and C<formline>;
-in particular, where the format itself is potentially variable (such as
-with ties and overloading), and where the format and data differ in their
-encoding. In both these cases, it used to possible for the output to be
-corrupted [perl #91032].
+=over 4
=item *
-C<formline> no longer converts its argument into a string in-place. So
-passing a reference to C<formline> no longer destroys the reference
-[perl #79532].
+XXX
=back
-=head2 Copy-on-write scalars
-
-Copy-on-write scalars were introduced in 5.8.0, but most Perl code
-did not encounter them (they were used mostly internally). Perl
-5.10.0 extended them, such that assigning C<__PACKAGE__> or a
-hash key to a scalar would make it copy-on-write. Several parts
-of Perl were not updated to account for them, but have now been fixed.
-
-=over
-
-=item *
-
-C<utf8::decode> had a nasty bug that would modify copy-on-write scalars'
-string buffers in place (i.e., skipping the copy). This could result in
-hashes having two elements with the same key [perl #91834].
-
-=item *
+=head1 Platform Support
-Lvalue subroutines were not allowing COW scalars to be returned. This was
-fixed for lvalue scalar context in Perl 5.12.3 and 5.14.0, but list context
-was not fixed until this release.
+XXX Any changes to platform support should be listed in the sections below.
-=item *
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
-Elements of restricted hashes (see the L<fields> pragma) containing
-copy-on-write values couldn't be deleted, nor could such hashes be cleared
-(C<%hash = ()>).
+=head2 New Platforms
-=item *
+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.
-Localising a tied variable used to make it read-only if it contained a
-copy-on-write string.
+=over 4
-=item *
+=item XXX-some-platform
-L<Storable>, L<Devel::Peek> and L<PerlIO::scalar> had similar problems.
-See L</Updated Modules and Pragmata>, above.
+XXX
=back
-=head2 lvalue subroutines
-
-There have been various fixes to lvalue subroutines.
-
-=over
-
-=item *
-
-Explicit return now returns the actual argument passed to return, instead
-of copying it [perl #72724] [perl #72706].
-
-B<Note:> There are still some discrepancies between explicit and implicit
-return, which will hopefully be resolved soon. So the exact behaviour is
-not set in stone yet.
-
-=item *
-
-Lvalue subroutines used to enforce lvalue syntax (i.e., whatever can go on
-the left-hand side of C<=>) for the last statement and the arguments to
-return. Since lvalue subroutines are not always called in lvalue context,
-this restriction has been lifted.
-
-=item *
-
-Lvalue subroutines are less restrictive as to what values can be returned.
-It used to croak on values returned by C<shift> and C<delete> and from
-other subroutines, but no longer does so [perl #71172].
-
-=item *
-
-Empty lvalue subroutines (C<sub :lvalue {}>) used to return C<@_> in list
-context. In fact, all subroutines used to, but regular subs were fixed in
-Perl 5.8.2. Now lvalue subroutines have been likewise fixed.
-
-=item *
-
-Lvalue subroutines used to copy their return values in rvalue context. Not
-only was this a waste of CPU cycles, but it also caused bugs. A C<($)>
-prototype would cause an lvalue sub to copy its return value [perl #51408],
-and C<while(lvalue_sub() =~ m/.../g) { ... }> would loop endlessly
-[perl #78680].
-
-=item *
-
-Autovivification now works on values returned from lvalue subroutines
-[perl #7946].
-
-=item *
-
-When called in pass-by-reference context (e.g., subroutine arguments or a list
-passed to C<for>), an lvalue subroutine returning arrays or hashes used to bind
-the arrays (or hashes) to scalar variables--something that is not supposed to
-happen. This could result in "Bizarre copy of ARRAY" errors or C<print>
-ignoring its arguments. It also made nonsensical code like C<@{\$_}> "work".
-This was fixed in 5.14.0 if an array were the first thing returned from the
-subroutine (but not for C<$scalar, @array> or hashes being returned). Now a
-more general fix has been applied [perl #23790].
-
-=item *
-
-When called in pass-by-reference context, lvalue subroutines used to copy
-any read-only value that was returned. E.g., C< sub :lvalue { $] } >
-would not return C<$]>, but a copy of it.
+=head2 Discontinued Platforms
-=item *
+XXX List any platforms that this version of perl no longer compiles on.
-Assignment to C<keys> returned from an lvalue sub used not to work, but now
-it does.
+=over 4
-=item *
+=item XXX-some-platform
-Applying the C<:lvalue> attribute to an XSUB or to an aliased subroutine
-stub with C<< sub foo :lvalue; >> syntax stopped working in Perl 5.12.
-This has been fixed.
+XXX
=back
-=head2 Fixes related to hashes
-
-=over
-
-=item *
-
-A bug has been fixed that would cause a "Use of freed value in iteration"
-error if the next two hash elements that would be iterated over are
-deleted [perl #85026]. (5.14.1)
+=head2 Platform-Specific Notes
-=item *
+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.
-Freeing deeply nested hashes no longer crashes [perl #44225].
+=over 4
-=item *
+=item XXX-some-platform
-Deleting the current hash iterator (the hash element that would be returend
-by the next call to C<each>) in void context used not to free it. The hash
-would continue to reference it until the next iteration. This has been
-fixed [perl #85026].
+XXX
=back
-=head2 Other notable fixes
-
-=over
-
-=item *
-
-Passing the same constant subroutine to both C<index> and C<formline> no
-longer causes one or the other to fail [perl #89218]. (5.14.1)
-
-=item *
-
-List assignment to lexical variables declared with attributes in the same
-statement (C<my ($x,@y) : blimp = (72,94)>) stopped working in Perl 5.8.0.
-It has now been fixed.
-
-=item *
-
-Perl 5.10.0 introduced some faulty logic that made "U*" in the middle of
-a pack template equivalent to "U0" if the input string was empty. This has
-been fixed [perl #90160].
-
-=item *
-
-Destructors on objects were not called during global destruction on objects
-that were not referenced by any scalars. This could happen if an array
-element were blessed (e.g., C<bless \$a[0]>) or if a closure referenced a
-blessed variable (C<bless \my @a; sub foo { @a }>).
-
-Now there is an extra pass during global destruction to fire destructors on
-any objects that might be left after the usual passes that check for
-objects referenced by scalars [perl #36347].
-
-This bug fix was added in Perl 5.13.9, but caused problems with some CPAN
-modules that were relying on the bug. Since it was so close to Perl
-5.14.0, the fix was reverted in 5.13.10, to allow more time for the modules
-to adapt. Hopefully they will be fixed soon (see L</Known Problems>,
-below).
-
-=item *
-
-C<given> was not calling set-magic on the implicit lexical C<$_> that it
-uses. This meant, for example, that C<pos> would be remembered from one
-execution of the same C<given> block to the next, even if the input were a
-different variable [perl #84526].
-
-=item *
-
-The "R" command for restarting a debugger session has been fixed to work on
-Windows, or any other system lacking a C<POSIX::_SC_OPEN_MAX> constant
-[perl #87740].
-
-=item *
-
-Fixed a case where it was possible that a freed buffer may have been read
-from when parsing a here document [perl #90128]. (5.14.1)
-
-=item *
-
-The C<study> function could become confused if fed a string longer than
-2**31 characters. Now it simply skips such strings.
-
-=item *
+=head1 Internal Changes
-C<each(I<ARRAY>)> is now wrapped in C<defined(...)>, like C<each(I<HASH>)>,
-inside a C<while> condition [perl #90888].
+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.
-=item *
+[ List each change as a =item entry ]
-In @INC filters (subroutines returned by subroutines in @INC), $_ used to
-misbehave: If returned from a subroutine, it would not be copied, but the
-variable itself would be returned; and freeing $_ (e.g., with C<undef *_>)
-would cause perl to crash. This has been fixed [perl #91880].
+=over 4
=item *
-An ASCII single quote (') in a symbol name is meant to be equivalent to a
-double colon (::) except at the end of the name. It was not equivalent if
-followed by a null character, but now it is [perl #88138].
-
-=item *
+XXX
-The abbreviations for four C1 control characters
-C<MW>
-C<PM>,
-C<RI>,
-and
-C<ST>
-were previously unrecognized by C<\N{}>,
-vianame(), and string_vianame().
+=back
-=item *
+=head1 Selected Bug Fixes
-Some cases of threads crashing due to memory allocation during cloning have
-been fixed [perl #90006].
+XXX Important bug fixes in the core language are summarised here.
+Bug fixes in files in F<ext/> and F<lib/> are best summarised in
+L</Modules and Pragmata>.
-=item *
+[ List each fix as a =item entry ]
-Attempting to C<goto> out of a tied handle method used to cause memory
-corruption or crashes. Now it produces an error message instead
-[perl #8611].
+=over 4
=item *
-Perl skips copying values returned from a subroutine if it thinks the value
-is not in use elsewhere. Due to faulty logic, this would happen with the
-result of C<delete>, C<shift> or C<splice>, even if the result was
-referenced elsewhere. So C<< \sub { delete $_[0] }->($x) >> would return a
-reference to C<$x>. This has been fixed [perl #91844].
+XXX
=back
=head1 Known Problems
-=over 4
-
-=item *
+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, unless
+they were specific to a particular platform (see below).
-The fix for perl #36347 causes test failures for C<Gtk2> and C<Tk> on some
-systems [perl #82542].
+This is a list of some significant unfixed bugs, which are regressions
+from either 5.XXX.XXX or 5.XXX.XXX.
-=item *
+[ List each fix as a =item entry ]
-The changes to C<tie> cause test failures for the C<JS> module.
+=over 4
=item *
-The changes to C<$$> cause test failures for the C<Event> module.
+XXX
=back
+=head1 Obituary
+
+XXX If any significant core contributor has died, we've added a short obituary
+here.
=head1 Acknowledgements
-Perl 5.15.0 represents approximatly five weeks of development since Perl
-5.14.0 and contains approximately 54,000 lines of changes across 618
-files from 57 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 5.15.0:
-
-Alan Haggai Alavi, Bo Johansson, Bo Lindbergh, brian d foy, Chia-liang
-Kao, Chris 'BinGOs' Williams, Claudio Ramirez, Craig A. Berry, David
-Golden, David Leadbeater, David Mitchell, Dennis Kaarsemaker, Dominic
-Hargreaves, Eric Brine, Father Chrysostomos, Florian Ragwitz, George
-Greer, Gisle Aas, H.Merijn Brand, Hojung Yoon, Ian Goodacre, Jesse
-Vincent, Jim Cromie, Johan Vromans, John Hawkinson, John P. Linderman,
-Joshua ben Jore, Karl Williamson, Kevin J. Woolley, Leo Lapworth, Leon
-Brocard, Leon Timmermans, Louis Strous, Marcel Grünauer, Martin Hasch,
-Max Maischein, Michael Witten, Moritz Lenz, Nicholas Clark, Niko Tyni,
-Nuno Carvalho, Pau Amma, Peter John Acklam, Robin Barker, Salvador
-Fandiño, Samuel Thibault, Shawn M Moore, Shigeya Suzuki, Shlomi Fish,
-Sisyphus, Steffen Müller, Todd Rinaldo, Tom Christiansen, Tony Cook,
-Vladimir Timofeev, Zefram and Zsbán Ambrus.
-
-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.
+XXX The list of people to thank goes here.
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff