Disallow omitting % and @ on hash and array names

[perl5.git] / pod / perldelta.pod

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 5ae7276..e64cc61 100644 (file)
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -1,10 +1,3 @@
-=for todo
-
-b51c3e77db (craigb) - Reduce excessive stat calls in glob on VMS
-869747506f/00051dd553 (merijn) - gcc 4.9 by default does some optimizations that break perl / -fwrapv is broken prior to gcc-4.3 (#121505)
-fc6f6f37f8 (craigb) - Make perlbug encoding-agnostic in handling prepared reports.
-7e6b9e3a66 (craigb) - Attempt to satisfy CRLF expectations in perlbug on Windows.
-

 =encoding utf8
 
 =head1 NAME
 =encoding utf8
 
 =head1 NAME


@@ -12,15 +5,15 @@ fc6f6f37f8 (craigb) - Make perlbug encoding-agnostic in handling prepared report
 [ this is a template for a new perldelta file.  Any text flagged as XXX needs
 to be processed before release. ]
 
 [ 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 v5.19.11
+perldelta - what is new for perl v5.21.1

 
 =head1 DESCRIPTION
 
 
 =head1 DESCRIPTION
 

-This document describes differences between the 5.19.10 release and the 5.19.11
+This document describes differences between the 5.21.0 release and the 5.21.1

 release.
 
 release.
 

-If you are upgrading from an earlier release such as 5.19.9, first read
-L<perl51910delta>, which describes differences between 5.19.9 and 5.19.10.
+If you are upgrading from an earlier release such as 5.20.0, first read
+L<perl5210delta>, which describes differences between 5.20.0 and 5.21.0.

 
 =head1 Notice
 
 
 =head1 Notice
 


@@ -34,6 +27,20 @@ here, but most should go in the L</Performance Enhancements> section.
 
 [ List each enhancement as a =head2 entry ]
 
 
 [ List each enhancement as a =head2 entry ]
 

+=head2 C<qr/foo/x> now ignores any Unicode pattern white space
+
+The C</x> regular expression modifier allows the pattern to contain
+white space and comments, both of which are ignored, for improved
+readability.  Until now, not all the white space characters that Unicode
+designates for this purpose were handled.  The additional ones now
+recognized are
+U+0085 NEXT LINE,
+U+200E LEFT-TO-RIGHT MARK,
+U+200F RIGHT-TO-LEFT MARK,
+U+2028 LINE SEPARATOR,
+and
+U+2029 PARAGRAPH SEPARATOR.
+

 =head1 Security
 
 XXX Any security-related notices go here.  In particular, any security
 =head1 Security
 
 XXX Any security-related notices go here.  In particular, any security


@@ -50,12 +57,50 @@ XXX For a release on a stable branch, this section aspires to be:
     If any exist, they are bugs, and we request that you submit a
     report.  See L</Reporting Bugs> below.
 
     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 In double-quotish C<\cI<X>>, I<X> must now be a printable ASCII character
+
+In prior releases, failure to do this raised a deprecation warning.
+
+=head2 Splitting the tokens C<(?> and C<(*> in regular expressions is
+now a fatal compilation error.
+
+These had been deprecated since v5.18.
+
+=head2 5 additional characters are treated as white space under C</x> in
+regex patterns (unless escaped)
+
+The use of these characters with C</x> outside bracketed character
+classes and when not preceeded by a backslash has raised a deprecation
+warning since v5.18.  Now they will be ignored.  See L</qrE<sol>fooE<sol>x>
+for the list of the five characters.
+
+=head2 Comment lines within S<C<(?[ ])>> now are ended only by a C<\n>
+
+S<C<(?[ ])>>  is an experimental feature, introduced in v5.18.  It operates
+as if C</x> is always enabled.  But there was a difference, comment
+lines (following a C<#> character) were terminated by anything matching
+C<\R> which includes all vertical whitespace, such as form feeds.  For
+consistency, this is now changed to match what terminates comment lines
+outside S<C<(?[ ])>>, namely a C<\n> (even if escaped), which is the
+same as what terminates a heredoc string and formats.
+
+=head2 Omitting % and @ on hash and array names is no longer permitted
+
+Really old Perl let you omit the @ on array names and the % on hash
+names in some spots.  This has issued a deprecation warning since Perl
+5.0, and is no longer permitted.

 
 =head1 Deprecations
 
 XXX Any deprecated features, syntax, modules etc. should be listed here.
 
 
 =head1 Deprecations
 
 XXX Any deprecated features, syntax, modules etc. should be listed here.
 

+=head2 Using a NO-BREAK space in a character alias for C<\N{...}> is now
+deprecated
+
+This non-graphic character is essentially indistinguishable from a
+regular space, and so should not be allowed.  See
+L<charnames/CUSTOM ALIASES>.
+

 =head2 Module removals
 
 XXX Remove this section if inapplicable.
 =head2 Module removals
 
 XXX Remove this section if inapplicable.


@@ -126,60 +171,98 @@ XXX
 
 =item *
 
 
 =item *
 

-L<Carp> has been upgraded from version 1.33 to 1.3301.
+L<Carp> has been upgraded from version 1.3301 to 1.34.
+
+Carp::Heavy now ignores version mismatches with Carp if Carp is newer
+than 1.12, since Carp::Heavy's guts were merged into Carp at that
+point.
+L<[perl #121574]|https://rt.perl.org/Ticket/Display.html?id=121574>
+
+=item *
+
+L<Encode> has been upgraded from version 2.60_01 to 2.62.

 
 

-No changes have been made to the installed code other than the version bump to
-keep in sync with the latest CPAN release.
+B<piconv> now has better error handling when the encoding name is nonexistent,
+and a build breakage when upgrading L<Encode> in perl-5.8.2 and earlier has
+been fixed.
+
+=item *
+
+The libnet collection of modules has been upgraded from version 1.25 to 1.27.
+
+There are only whitespace changes to the installed files.

 
 =item *
 
 
 =item *
 

-L<CPAN> has been upgraded from version 2.04-TRIAL to 2.05-TRIAL.
+The Locale-Codes collection of modules has been upgraded from vesion 3.30 to 3.31.

 
 

-TODO
+Fixed a bug in the scripts used to extract data from spreadsheets that
+prevented the SHP currency code from being found.
+L<[cpan #94229]|https://rt.cpan.org/Ticket/Display.html?id=94229>

 
 =item *
 
 
 =item *
 

-L<DB> has been upgraded from version 1.43 to 1.44.
+L<Math::BigInt> has been upgraded from version 1.9993 to 1.9994.
+
+Synchronize POD changes from the CPAN release.

 
 

-The debugger now correctly restores its input and output filehandles after
-using the pager command.
-[L<perl #121456|https://rt.perl.org/Public/Bug/Display.html?id=121456>]
+C<< Math::BigFloat->blog(x) >> would sometimes return blog(2*x) when
+the accuracy was greater than 70 digits.
+
+The result of C<< Math::BigFloat->bdiv() >> in list context now
+satisfies C<< x = quotient * divisor + remainder >>.

 
 =item *
 
 
 =item *
 

-L<ExtUtils::Install> has been upgraded from version 1.63 to 1.64.
+L<Math::BigRat> has been upgraded from version 0.2606 to 0.2607.
+
+Synchronize POD changes from the CPAN release.
+
+=item *

 
 

-When upgrading an already-installed file, L<ExtUtils::Install> could mess up
-the permissions of files if the old versions of files were hard or symbolic
-links.  This has now been fixed.
-[L<perl #72028|https://rt.perl.org/Public/Bug/Display.html?id=72028>]
+L<Module::Metadata> has been upgraded from version 1.000022 to 1.000024.

 
 

-The MM_TEST_ROOT feature has been removed from the tests.
+Support installations on older perls with an L<ExtUtils::MakeMaker> earlier
+than 6.63_03

 
 =item *
 
 
 =item *
 

-L<ExtUtils::MakeMaker> has been upgraded from version 6.92 to 6.94.
+L<perl5db.pl> has been upgraded from version 1.44 to 1.45.

 
 

-A regression in MM_Unix.pm has been resolved.
-[L<#96|https://github.com/Perl-Toolchain-Gang/ExtUtils-MakeMaker/issues/96>]
+=item *
+
+A mismatch between the documentation and the code in utf8::downgrade()
+was fixed in favour of the documentation. The optional second argument
+is now correctly treated as a perl boolean (true/false semantics) and
+not as an integer.

 
 =item *
 
 
 =item *
 

-L<Module::CoreList> has been upgraded from version 3.09 to 3.10.
+fork() in the debugger under C<tmux> will now create a new window for
+the forked process. L<[perl
+#121333]|https://rt.perl.org/Ticket/Display.html?id=121333>
+
+The debugger now saves the current working directory on startup and
+restores it when you restart your program with C<R> or <rerun>. L<[perl
+#121509]|https://rt.perl.org/Ticket/Display.html?id=121509>

 
 

-The list of Perl versions covered has been updated.
+L<Unicode::Collate> has been upgraded from version 1.04 to 1.07.
+
+Version 0.67's improved discontiguous contractions is invalidated by default
+and is supported as a parameter 'long_contraction'.

 
 =item *
 
 
 =item *
 

-L<PerlIO> has been upgraded from version 1.08 to 1.09.
+L<Unicode::Normalize> has been upgraded from version 1.17 to 1.18.

 
 

-The warning about the use of the C<:utf8> layer has been made more prominent.
+The XSUB implementation has been removed in favour of pure Perl.

 
 =item *
 
 
 =item *
 

-L<Storable> has been upgraded from version 2.48 to 2.49.
+L<Hash::Util> has been upgraded from version 0.16 to 0.17.
+
+Minor bug fixes and documentation fixes to Hash::Util::hash_stats()

 
 

-Recognition of tied SVs has been tightened up.

 
 =back
 
 
 =back
 


@@ -264,9 +347,10 @@ XXX Changes (i.e. rewording) of diagnostic messages go here
 
 =item *
 
 
 =item *
 

-The now fatal error message C<Character following "\c" must be ASCII> has been
-reworded as C<Character following "\c" must be printable ASCII> to emphasize
-that in C<\cI<X>>, I<X> must be a I<printable (non-control)> ASCII character.
+L<Unsuccessful %s on filename containing newline|perldiag/"Unsuccessful %s on filename containing newline">
+
+This warning is now only produced when the newline is at the end of
+the filename.

 
 =back
 
 
 =back
 


@@ -275,11 +359,11 @@ that in C<\cI<X>>, I<X> must be a I<printable (non-control)> ASCII character.
 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>.
 
 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>.
 

-[ List utility changes as a =head3 entry for each utility and =item
+[ 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. ]
 
 entries for each change
 Use L<XXX> with program names to get proper documentation linking. ]
 

-=head3 L<XXX>
+=head2 L<XXX>

 
 =over 4
 
 
 =over 4
 


@@ -367,45 +451,9 @@ L</Modules and Pragmata> section.
 
 =over 4
 
 
 =over 4
 

-=item Win32
-
-The time taken to build perl on Windows has been reduced quite significantly
-(time savings in the region of 30-40% are typically seen) by reducing the
-number of, usually failing, I/O calls for each L<perlfunc/require> (for
-miniperl only).
-[L<perl #121119|https://rt.perl.org/Public/Bug/Display.html?id=121119>]
-
-About 15 minutes of idle sleeping was removed from running C<make test> due to
-a bug in which the timeout monitor used for tests could not be cancelled once
-the test completes, and the full timeout period elapsed before running the next
-test file.
-[L<perl #121395|https://rt.perl.org/Public/Bug/Display.html?id=121395>]
-
-On a perl built without psuedo-fork (psuedo-fork builds were not affected by
-this bug), killing a process tree with L<perlfunc/kill> and a negative signal
-resulted in kill() inverting the returned value.  For example, if kill() killed
-1 process tree PID then it returned 0 instead of 1, and if kill() was passed 2
-invalid PIDs then it returned 2 instead of 0.  This has probably been the case
-since the process tree kill feature was implemented on Win32.  It has now been
-corrected to follow the documented behaviour.
-[L<perl #121230|https://rt.perl.org/Public/Bug/Display.html?id=121230>]
-
-When building a 64-bit perl, an uninitialized memory read in B<miniperl.exe>,
-used during the build process, could lead to a 4GB B<wperl.exe> being created.
-This has now been fixed.  (Note that B<perl.exe> itself was unaffected, but
-obviously B<wperl.exe> would have been completely broken.)
-[L<perl #121471|https://rt.perl.org/Public/Bug/Display.html?id=121471>]
-
-Perl can now be built with B<gcc> version 4.8.1 from L<http://www.mingw.org>.
-This was previously broken due to an incorrect definition of C<DllMain()> in
-one of perl's source files.  Earlier B<gcc> versions were also affected when
-using version 4 of the w32api package.  Versions of B<gcc> available from
-L<http://mingw-w64.sourceforge.net/> were not affected.
-[L<perl #121643|https://rt.perl.org/Public/Bug/Display.html?id=121643>]
-
-The test harness now has no failures when perl is built on a FAT drive with the
-Windows OS on an NTFS drive.
-[L<perl #21442|https://rt.perl.org/Public/Bug/Display.html?id=21442>]
+=item XXX-some-platform
+
+XXX

 
 =back
 
 
 =back
 


@@ -415,18 +463,11 @@ 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.
 
 significant internal changes for future core maintainers should be noted as
 well.
 

-[ List each change as a =item entry ]
-

 =over 4
 
 =item *
 
 =over 4
 
 =item *
 

-C<LC_NUMERIC> is now initialized to the C locale.  This affects only
-C<XS> modules, as the Perl core usages always make sure this locale
-category is correctly set for their purposes.  C<XS> code remains
-vulnerable to other code changing this category's locale.  Further fixes
-are planned in v5.22 to reduce these long-standing vulnerabilities.
-[L<perl #121317|https://rt.perl.org/Public/Bug/Display.html?id=121317>]
+The deprecated variable C<PL_sv_objcount> has been removed.

 
 =back
 
 
 =back
 


@@ -441,45 +482,15 @@ files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
 
 =item *
 
 
 =item *
 

-A regression involving the string value of C<$!> introduced in v5.19.2
-has been reverted for v5.20.
-[L<perl #119499|https://rt.perl.org/Public/Bug/Display.html?id=119499>]
-This re-breaks the bugs it fixed,
-L<perl #112208|https://rt.perl.org/Ticket/Display.html?id=112208>, so
-an alternative fix is planned for v5.22
-
-=item *
-
-A regression was introduced in v5.19.10 that under some circumstances
-caused C<//m> matches to falsely fail. Now fixed.
-
-=item *
-
-A regression was introduced in the fix for
-[L<perl #116192|https://rt.perl.org/Public/Bug/Display.html?id=116192>] that
-prevented C<perl -I /somedir/> (with a trailing slash) from finding .pmc files. This has
-been fixed.
-[L<perl #121512|https://rt.perl.org/Public/Bug/Display.html?id=121512>].
-
-=item *
-
-Fixed a bug detected by valgrind where sv_pvn_force_flags() would
-check SvPVX() even when the SV hadn't been upgraded to a C<SVt_PV>.
-SvPVX() is only initialized when the SV is upgraded to a C<SVt_PV> or
-higher.  [L<perl
-#121366|https://rt.perl.org/Public/Bug/Display.html?id=121366>]
+index() and rindex() no longer crash when used on strings over 2GB in
+size.
+L<[perl #121562]|https://rt.perl.org/Ticket/Display.html?id=121562>.

 
 =item *
 
 
 =item *
 

-Fixed a bug in caller() introduced in 5.18.0.  In some circumstances
-when caller() was called on an C<eval STRING> stack frame it would
-attempt to allocate the limit of the address space minus one, which
-would croak with an out of memory error, which would be caught by the
-eval.  A change in 5.19.1 which increased allocation sizes to allow
-COW to operate more often rounded that allocation size up and wrapped
-to a zero allocation size, resulting in a crash when the source string
-was copied over.  [L<perl
-#120998|https://rt.perl.org/Public/Bug/Display.html?id=120998>].
+A small previously intentional memory leak in PERL_SYS_INIT/PERL_SYS_INIT3 on
+Win32 builds was fixed. This might affect embedders who repeatedly create and
+destroy perl engines within the same process.

 
 =back
 
 
 =back
 


@@ -519,7 +530,7 @@ here.
 
 XXX Generate this with:
 
 
 XXX Generate this with:
 

-  perl Porting/acknowledgements.pl v5.19.10..HEAD
+  perl Porting/acknowledgements.pl v5.21.1..HEAD

 
 =head1 Reporting Bugs
 
 
 =head1 Reporting Bugs