=head1 NAME
-perldelta - what is new for perl v5.14.0
+perldelta - what is new for perl v5.15.0
=head1 DESCRIPTION
-This document describes differences between the 5.12.0 release and
+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 5.10.0, first read
-L<perl5120delta>, which describes differences between 5.10.0 and
-5.12.0.
+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 bug fixes in this release have been backported to subsequent
-releases of 5.12.x. Those are indicated with the 5.12.x version in
-parentheses.
+Some of the changes have been included in Perl 5.14.1. These are
+indicated with a "(5.14.1)" marker.
-=head1 Notice
-
-As described in L<perlpolicy>, the release of Perl 5.14.0 marks the
-official end of support for Perl 5.10. Users of Perl 5.10 or earlier
-should consider upgrading to a more recent release of Perl.
-
-=head1 Core Enhancements
-
-=head2 Unicode
-
-=head3 Unicode Version 6.0 is now supported (mostly)
-
-Perl comes with the Unicode 6.0 data base updated with
-L<Corrigendum #8|http://www.unicode.org/versions/corrigendum8.html>,
-with one exception noted below.
-See L<http://unicode.org/versions/Unicode6.0.0/> for details on the new
-release. Perl does not support any Unicode provisional properties,
-including the new ones for this release.
-
-Unicode 6.0 has chosen to use the name C<BELL> for the character at U+1F514,
-which is a symbol that looks like a bell, and is used in Japanese cell
-phones. This conflicts with the long-standing Perl usage of having
-C<BELL> mean the ASCII C<BEL> character, U+0007. In Perl 5.14,
-C<\N{BELL}> continues to mean U+0007, but its use generates a
-deprecation warning message unless such warnings are turned off. The
-new name for U+0007 in Perl is C<ALERT>, which corresponds nicely
-with the existing shorthand sequence for it, C<"\a">. C<\N{BEL}>
-means U+0007, with no warning given. The character at U+1F514 has no
-name in 5.14, but can be referred to by C<\N{U+1F514}>.
-In Perl 5.16, C<\N{BELL}> will refer to U+1F514; all code
-that uses C<\N{BELL}> should be converted to use C<\N{ALERT}>,
-C<\N{BEL}>, or C<"\a"> before upgrading.
-
-=head3 Full functionality for C<use feature 'unicode_strings'>
-
-This release provides full functionality for C<use feature
-'unicode_strings'>. Under its scope, all string operations executed and
-regular expressions compiled (even if executed outside its scope) have
-Unicode semantics. See L<feature/"the 'unicode_strings' feature">.
-
-This feature avoids most forms of the "Unicode Bug" (see
-L<perlunicode/The "Unicode Bug"> for details). If there is any
-possibility that your code will process Unicode strings, you are
-I<strongly> encouraged to use this subpragma to avoid nasty surprises.
-
-=head3 C<\N{I<NAME>}> and C<charnames> enhancements
-
-=over
-
-=item *
-
-C<\N{I<NAME>}> and C<charnames::vianame> now know about the abbreviated
-character names listed by Unicode, such as NBSP, SHY, LRO, ZWJ, etc.; all
-customary abbreviations for the C0 and C1 control characters (such as
-ACK, BEL, CAN, etc.); and a few new variants of some C1 full names that
-are in common usage.
-
-=item *
-
-Unicode has several I<named character sequences>, in which particular sequences
-of code points are given names. C<\N{I<NAME>}> now recognizes these.
-
-=item *
-
-C<\N{I<NAME>}>, C<charnames::vianame>, and C<charnames::viacode>
-now know about every character in Unicode. In earlier releases of
-Perl, they didn't know about the Hangul syllables nor several
-CJK (Chinese/Japanese/Korean) characters.
-
-=item *
-
-It is now possible to override Perl's abbreviations with your own custom aliases.
-
-=item *
-
-You can now create a custom alias of the ordinal of a
-character, known by C<\N{I<NAME>}>, C<charnames::vianame()>, and
-C<charnames::viacode()>. Previously, aliases had to be to official
-Unicode character names. This made it impossible to create an alias for
-unnamed code points, such as those reserved for private
-use.
-
-=item *
-
-The new function charnames::string_vianame() is a run-time version
-of C<\N{I<NAME>}}>, returning the string of characters whose Unicode
-name is its parameter. It can handle Unicode named character
-sequences, whereas the pre-existing charnames::vianame() cannot,
-as the latter returns a single code point.
-
-=back
-
-See L<charnames> for details on all these changes.
-
-=head3 New warnings categories for problematic (non-)Unicode code points.
-
-Three new warnings subcategories of "utf8" have been added. These
-allow you to turn off some "utf8" warnings, while allowing
-other warnings to remain on. The three categories are:
-C<surrogate> when UTF-16 surrogates are encountered;
-C<nonchar> when Unicode non-character code points are encountered;
-and C<non_unicode> when code points above the legal Unicode
-maximum of 0x10FFFF are encountered.
-
-=head3 Any unsigned value can be encoded as a character
-
-With this release, Perl is adopting a model that any unsigned value
-can be treated as a code point and encoded internally (as utf8)
-without warnings, not just the code points that are legal in Unicode.
-However, unless utf8 or the corresponding sub-category (see previous
-item) of lexical warnings have been explicitly turned off, outputting
-or executing a Unicode-defined operation such as upper-casing
-on such a code point generates a warning. Attempting to input these
-using strict rules (such as with the C<:encoding(UTF-8)> layer)
-will continue to fail. Prior to this release, handling was
-inconsistent and in places, incorrect.
-
-Unicode non-characters, some of which previously were erroneously
-considered illegal in places by Perl, contrary to the Unicode Standard,
-are now always legal internally. Inputting or outputting them
-works the same as with the non-legal Unicode code points, because the Unicode
-Standard says they are (only) illegal for "open interchange".
-
-=head3 Unicode database files not installed
-
-The Unicode database files are no longer installed with Perl. This
-doesn't affect any functionality in Perl and saves significant disk
-space. If you need these files, you can download them from
-L<http://www.unicode.org/Public/zipped/6.0.0/>.
-
-=head2 Regular Expressions
-
-=head3 C<(?^...)> construct signifies default modifiers
-
-An ASCII caret C<"^"> immediately following a C<"(?"> in a regular
-expression now means that the subexpression does not inherit surrounding
-modifiers such as C</i>, but reverts to the Perl defaults. Any modifiers
-following the caret override the defaults.
-
-Stringification of regular expressions now uses this notation.
-For example, C<qr/hlagh/i> would previously be stringified as
-C<(?i-xsm:hlagh)>, but now it's stringified as C<(?^i:hlagh)>.
-
-The main purpose of this change is to allow tests that rely on the
-stringification I<not> to have to change whenever new modifiers are added.
-See L<perlre/Extended Patterns>.
-
-This change is likely to break code that compares stringified regular
-expressions with fixed strings containing C<?-xism>.
-
-=head3 C</d>, C</l>, C</u>, C</a>, and C</aa> modifiers
-
-Four new regular expression modifiers have been added. These are mutually
-exclusive: one only can be turned on at a time.
-
-=over
-
-=item *
-
-The C</l> modifier says to compile the regular expression as if it were
-in the scope of C<use locale>, even if it is not.
-
-=item *
-
-The C</u> modifier says to compile the regular expression as if it were
-in the scope of a C<use feature 'unicode_strings'> pragma.
-
-=item *
-
-The C</d> (default) modifier is used to override any C<use locale> and
-C<use feature 'unicode_strings'> pragmas in effect at the time
-of compiling the regular expression.
-
-=item *
-
-The C</a> regular expression modifier restricts C<\s>, C<\d> and C<\w> and
-the POSIX (C<[[:posix:]]>) character classes to the ASCII range. Their
-complements and C<\b> and C<\B> are correspondingly
-affected. Otherwise, C</a> behaves like the C</u> modifier, in that
-case-insensitive matching uses Unicode semantics.
-
-=item *
-
-The C</aa> modifier is like C</a>, except that, in case-insensitive
-matching, no ASCII character can match a non-ASCII character.
-For example,
-
- "k" =~ /\N{KELVIN SIGN}/ai
- "\xDF" =~ /ss/ai
-
-match but
-
- "k" =~ /\N{KELVIN SIGN}/aai
- "\xDF" =~ /ss/aai
-
-do not match.
-
-=back
-
-See L<perlre/Modifiers> for more detail.
-
-=head3 Non-destructive substitution
-
-The substitution (C<s///>) and transliteration
-(C<y///>) operators now support an C</r> option that
-copies the input variable, carries out the substitution on
-the copy, and returns the result. The original remains unmodified.
-
- my $old = "cat";
- my $new = $old =~ s/cat/dog/r;
- # $old is "cat" and $new is "dog"
-
-This is particularly useful with C<map>. See L<perlop> for more examples.
-
-=head3 Re-entrant regular expression engine
-
-It is now safe to use regular expressions within C<(?{...})> and
-C<(??{...})> code blocks inside regular expressions.
-
-These blocks are still experimental, however, and still have problems with
-lexical (C<my>) variables and abnormal exiting.
-
-=head3 C<use re '/flags'>
-
-The C<re> pragma now has the ability to turn on regular expression flags
-till the end of the lexical scope:
-
- use re "/x";
- "foo" =~ / (.+) /; # /x implied
-
-See L<re/"'/flags' mode"> for details.
-
-=head3 \o{...} for octals
-
-There is a new octal escape sequence, C<"\o">, in doublequote-like
-contexts. This construct allows large octal ordinals beyond the
-current max of 0777 to be represented. It also allows you to specify a
-character in octal which can safely be concatenated with other regex
-snippets and which won't be confused with being a backreference to
-a regex capture group. See L<perlre/Capture groups>.
-
-=head3 Add C<\p{Titlecase}> as a synonym for C<\p{Title}>
-
-This synonym is added for symmetry with the Unicode property names
-C<\p{Uppercase}> and C<\p{Lowercase}>.
-
-=head3 Regular expression debugging output improvement
-
-Regular expression debugging output (turned on by C<use re 'debug'>) now
-uses hexadecimal when escaping non-ASCII characters, instead of octal.
-
-=head3 Return value of C<delete $+{...}>
-
-Custom regular expression engines can now determine the return value of
-C<delete> on an entry of C<%+> or C<%->.
-
-=head2 Syntactical Enhancements
-
-=head3 Array and hash container functions accept references
-
-B<Warning:> This feature is considered experimental, as the exact behaviour
-may change in a future version of Perl.
-
-All builtin functions that operate directly on array or hash
-containers now also accept unblessed hard references to arrays
-or hashes:
-
- |----------------------------+---------------------------|
- | Traditional syntax | Terse syntax |
- |----------------------------+---------------------------|
- | push @$arrayref, @stuff | push $arrayref, @stuff |
- | unshift @$arrayref, @stuff | unshift $arrayref, @stuff |
- | pop @$arrayref | pop $arrayref |
- | shift @$arrayref | shift $arrayref |
- | splice @$arrayref, 0, 2 | splice $arrayref, 0, 2 |
- | keys %$hashref | keys $hashref |
- | keys @$arrayref | keys $arrayref |
- | values %$hashref | values $hashref |
- | values @$arrayref | values $arrayref |
- | ($k,$v) = each %$hashref | ($k,$v) = each $hashref |
- | ($k,$v) = each @$arrayref | ($k,$v) = each $arrayref |
- |----------------------------+---------------------------|
-
-This allows these builtin functions to act on long dereferencing chains
-or on the return value of subroutines without needing to wrap them in
-C<@{}> or C<%{}>:
-
- push @{$obj->tags}, $new_tag; # old way
- push $obj->tags, $new_tag; # new way
-
- for ( keys %{$hoh->{genres}{artists}} ) {...} # old way
- for ( keys $hoh->{genres}{artists} ) {...} # new way
-
-=head3 Single term prototype
-
-The C<+> prototype is a special alternative to C<$> that acts like
-C<\[@%]> when given a literal array or hash variable, but will otherwise
-force scalar context on the argument. See L<perlsub/Prototypes>.
-
-=head3 C<package> block syntax
-
-A package declaration can now contain a code block, in which case the
-declaration is in scope inside that block only. So C<package Foo { ... }>
-is precisely equivalent to C<{ package Foo; ... }>. It also works with
-a version number in the declaration, as in C<package Foo 1.2 { ... }>,
-which is its most attractive feature. See L<perlfunc>.
-
-=head3 Statement labels can appear in more places
-
-Statement labels can now occur before any type of statement or declaration,
-such as C<package>.
-
-=head3 Stacked labels
-
-Multiple statement labels can now appear before a single statement.
-
-=head3 Uppercase X/B allowed in hexadecimal/binary literals
-
-Literals may now use either upper case C<0X...> or C<0B...> prefixes,
-in addition to the already supported C<0x...> and C<0b...>
-syntax [perl #76296].
-
-C, Ruby, Python, and PHP already support this syntax, and it makes
-Perl more internally consistent: a round-trip with C<eval sprintf
-"%#X", 0x10> now returns C<16>, just like C<eval sprintf "%#x", 0x10>.
-
-=head3 Overridable tie functions
-
-C<tie>, C<tied> and C<untie> can now be overridden [perl #75902].
-
-=head2 Exception Handling
-
-To make them more reliable and consistent, several changes have been made
-to how C<die>, C<warn>, and C<$@> behave.
-
-=over
-
-=item *
-
-When an exception is thrown inside an C<eval>, the exception is no
-longer at risk of being clobbered by destructor code running during unwinding.
-Previously, the exception was written into C<$@>
-early in the throwing process, and would be overwritten if C<eval> was
-used internally in the destructor for an object that had to be freed
-while exiting from the outer C<eval>. Now the exception is written
-into C<$@> last thing before exiting the outer C<eval>, so the code
-running immediately thereafter can rely on the value in C<$@> correctly
-corresponding to that C<eval>. (C<$@> is still also set before exiting the
-C<eval>, for the sake of destructors that rely on this.)
-
-Likewise, a C<local $@> inside an C<eval> no longer clobbers any
-exception thrown in its scope. Previously, the restoration of C<$@> upon
-unwinding would overwrite any exception being thrown. Now the exception
-gets to the C<eval> anyway. So C<local $@> is safe before a C<die>.
-
-Exceptions thrown from object destructors no longer modify the C<$@>
-of the surrounding context. (If the surrounding context was exception
-unwinding, this used to be another way to clobber the exception being
-thrown.) Previously such an exception was
-sometimes emitted as a warning, and then either was
-string-appended to the surrounding C<$@> or completely replaced the
-surrounding C<$@>, depending on whether that exception and the surrounding
-C<$@> were strings or objects. Now, an exception in this situation is
-always emitted as a warning, leaving the surrounding C<$@> untouched.
-In addition to object destructors, this also affects any function call
-run by XS code using the C<G_KEEPERR> flag.
-
-=item *
-
-Warnings for C<warn> can now be objects in the same way as exceptions
-for C<die>. If an object-based warning gets the default handling
-of writing to standard error, it is stringified as before with the
-filename and line number appended. But a C<$SIG{__WARN__}> handler now
-receives an object-based warning as an object, where previously it
-was passed the result of stringifying the object.
-
-=back
-
-=head2 Other Enhancements
-
-=head3 Assignment to C<$0> sets the legacy process name with prctl() on Linux
-
-On Linux the legacy process name is now set with L<prctl(2)>, in
-addition to altering the POSIX name via C<argv[0]>, as Perl has done
-since version 4.000. Now system utilities that read the legacy process
-name such as I<ps>, I<top>, and I<killall> recognize the name you set when
-assigning to C<$0>. The string you supply is truncated at 16 bytes;
-this limitation is imposed by Linux.
-
-=head3 srand() now returns the seed
-
-This allows programs that need to have repeatable results not to have to come
-up with their own seed-generating mechanism. Instead, they can use srand()
-and stash the return value for future use. One example is a test program with
-too many combinations to test comprehensively in the time available for
-each run. It can test a random subset each time and, should there be a failure,
-log the seed used for that run so this can later be used to produce the same results.
-
-=head3 printf-like functions understand post-1980 size modifiers
-
-Perl's printf and sprintf operators, and Perl's internal printf replacement
-function, now understand the C90 size modifiers "hh" (C<char>), "z"
-(C<size_t>), and "t" (C<ptrdiff_t>). Also, when compiled with a C99
-compiler, Perl now understands the size modifier "j" (C<intmax_t>)
-(but this is not portable).
-
-So, for example, on any modern machine, C<sprintf("%hhd", 257)> returns "1".
-
-=head3 New global variable C<${^GLOBAL_PHASE}>
-
-A new global variable, C<${^GLOBAL_PHASE}>, has been added to allow
-introspection of the current phase of the Perl interpreter. It's explained in
-detail in L<perlvar/"${^GLOBAL_PHASE}"> and in
-L<perlmod/"BEGIN, UNITCHECK, CHECK, INIT and END">.
-
-=head3 C<-d:-foo> calls C<Devel::foo::unimport>
-
-The syntax B<-d:foo> was extended in 5.6.1 to make B<-d:foo=bar>
-equivalent to B<-MDevel::foo=bar>, which expands
-internally to C<use Devel::foo 'bar'>.
-Perl now allows prefixing the module name with B<->, with the same
-semantics as B<-M>; that is:
-
-=over 4
-
-=item C<-d:-foo>
-
-Equivalent to B<-M-Devel::foo>: expands to
-C<no Devel::foo> and calls C<< Devel::foo->unimport() >>
-if that method exists.
-
-=item C<-d:-foo=bar>
-
-Equivalent to B<-M-Devel::foo=bar>: expands to C<no Devel::foo 'bar'>,
-and calls C<< Devel::foo->unimport("bar") >> if that method exists.
-
-=back
-
-This is particularly useful for suppressing the default actions of a
-C<Devel::*> module's C<import> method whilst still loading it for debugging.
-
-=head3 Filehandle method calls load L<IO::File> on demand
-
-When a method call on a filehandle would die because the method cannot
-be resolved and L<IO::File> has not been loaded, Perl now loads L<IO::File>
-via C<require> and attempts method resolution again:
-
- open my $fh, ">", $file;
- $fh->binmode(":raw"); # loads IO::File and succeeds
-
-This also works for globs like C<STDOUT>, C<STDERR>, and C<STDIN>:
-
- STDOUT->autoflush(1);
-
-Because this on-demand load happens only if method resolution fails, the
-legacy approach of manually loading an L<IO::File> parent class for partial
-method support still works as expected:
-
- use IO::Handle;
- open my $fh, ">", $file;
- $fh->autoflush(1); # IO::File not loaded
-
-=head3 Improved IPv6 support
-
-The C<Socket> module provides new affordances for IPv6,
-including implementations of the C<Socket::getaddrinfo()> and
-C<Socket::getnameinfo()> functions, along with related constants and a
-handful of new functions. See L<Socket>.
-
-=head3 DTrace probes now include package name
-
-The C<DTrace> probes now include an additional argument, C<arg3>, which contains
-the package the subroutine being entered or left was compiled in.
-
-For example, using the following DTrace script:
-
- perl$target:::sub-entry
- {
- printf("%s::%s\n", copyinstr(arg0), copyinstr(arg3));
- }
-
-and then running:
-
- $ perl -e 'sub test { }; test'
-
-C<DTrace> will print:
-
- main::test
-
-=head2 New C APIs
-
-See L</Internal Changes>.
-
-=head1 Security
-
-=head2 User-defined regular expression properties
-
-L<perlunicode/"User-Defined Character Properties"> documented that you can
-create custom properties by defining subroutines whose names begin with
-"In" or "Is". However, Perl did not actually enforce that naming
-restriction, so C<\p{foo::bar}> could call foo::bar() if it existed. The documented
-convention is now enforced.
-
-Also, Perl no longer allows tainted regular expressions to invoke a
-user-defined property. It simply dies instead [perl #82616].
-
-=head1 Incompatible Changes
-
-Perl 5.14.0 is not binary-compatible with any previous stable release.
-
-In addition to the sections that follow, see L</C API Changes>.
-
-=head2 Regular Expressions and String Escapes
-
-=head3 \400-\777
-
-In certain circumstances, C<\400>-C<\777> in regexes have behaved
-differently than they behave in all other doublequote-like contexts.
-Since 5.10.1, Perl has issued a deprecation warning when this happens.
-Now, these literals behave the same in all doublequote-like contexts,
-namely to be equivalent to C<\x{100}>-C<\x{1FF}>, with no deprecation
-warning.
-
-Use of C<\400>-C<\777> in the command-line option B<-0> retain their
-conventional meaning. They slurp whole input files; previously, this
-was documented only for B<-0777>.
-
-Because of various ambiguities, you should use the new
-C<\o{...}> construct to represent characters in octal instead.
-
-=head3 Most C<\p{}> properties are now immune to case-insensitive matching
-
-For most Unicode properties, it doesn't make sense to have them match
-differently under C</i> case-insensitive matching. Doing so can lead
-to unexpected results and potential security holes. For example
-
- m/\p{ASCII_Hex_Digit}+/i
-
-could previously match non-ASCII characters because of the Unicode
-matching rules (although there were several bugs with this). Now
-matching under C</i> gives the same results as non-C</i> matching except
-for those few properties where people have come to expect differences,
-namely the ones where casing is an integral part of their meaning, such
-as C<m/\p{Uppercase}/i> and C<m/\p{Lowercase}/i>, both of which match
-the same code points as matched by C<m/\p{Cased}/i>.
-Details are in L<perlrecharclass/Unicode Properties>.
-
-User-defined property handlers that need to match differently under C</i>
-must be changed to read the new boolean parameter passed to them, which
-is non-zero if case-insensitive matching is in effect and 0 otherwise.
-See L<perlunicode/User-Defined Character Properties>.
-
-=head3 \p{} implies Unicode semantics
-
-Specifying a Unicode property in the pattern indicates
-that the pattern is meant for matching according to Unicode rules, the way
-C<\N{I<NAME>}> does.
-
-=head3 Regular expressions retain their localeness when interpolated
-
-Regular expressions compiled under C<use locale> now retain this when
-interpolated into a new regular expression compiled outside a
-C<use locale>, and vice-versa.
-
-Previously, one regular expression interpolated into another inherited
-the localeness of the surrounding regex, losing whatever state it
-originally had. This is considered a bug fix, but may trip up code that
-has come to rely on the incorrect behaviour.
-
-=head3 Stringification of regexes has changed
-
-Default regular expression modifiers are now notated using
-C<(?^...)>. Code relying on the old stringification will fail.
-This is so that when new modifiers are added, such code won't
-have to keep changing each time this happens, because the stringification
-will automatically incorporate the new modifiers.
-
-Code that needs to work properly with both old- and new-style regexes
-can avoid the whole issue by using (for perls since 5.9.5; see L<re>):
-
- use re qw(regexp_pattern);
- my ($pat, $mods) = regexp_pattern($re_ref);
-
-If the actual stringification is important or older Perls need to be
-supported, you can use something like the following:
-
- # Accept both old and new-style stringification
- my $modifiers = (qr/foobar/ =~ /\Q(?^/) ? "^" : "-xism";
-
-And then use C<$modifiers> instead of C<-xism>.
-
-=head3 Run-time code blocks in regular expressions inherit pragmata
-
-Code blocks in regular expressions (C<(?{...})> and C<(??{...})>) previously
-did not inherit pragmata (strict, warnings, etc.) if the regular expression
-was compiled at run time as happens in cases like these two:
-
- use re "eval";
- $foo =~ $bar; # when $bar contains (?{...})
- $foo =~ /$bar(?{ $finished = 1 })/;
-
-This bug has now been fixed, but code that relied on the buggy behaviour
-may need to be fixed to account for the correct behaviour.
-
-=head2 Stashes and Package Variables
-
-=head3 Localised tied hashes and arrays are no longed tied
-
-In the following:
-
- tie @a, ...;
- {
- local @a;
- # here, @a is a now a new, untied array
- }
- # here, @a refers again to the old, tied array
-
-Earlier versions of Perl incorrectly tied the new local array. This has
-now been fixed. This fix could however potentially cause a change in
-behaviour of some code.
-
-=head3 Stashes are now always defined
-
-C<defined %Foo::> now always returns true, even when no symbols have yet been
-defined in that package.
-
-This is a side-effect of removing a special-case kludge in the tokeniser,
-added for 5.10.0, to hide side-effects of changes to the internal storage of
-hashes. The fix drastically reduces hashes' memory overhead.
-
-Calling defined on a stash has been deprecated since 5.6.0, warned on
-lexicals since 5.6.0, and warned for stashes and other package
-variables since 5.12.0. C<defined %hash> has always exposed an
-implementation detail: emptying a hash by deleting all entries from it does
-not make C<defined %hash> false. Hence C<defined %hash> is not valid code to
-determine whether an arbitrary hash is empty. Instead, use the behaviour
-of an empty C<%hash> always returning false in scalar context.
-
-=head3 Clearing stashes
-
-Stash list assignment C<%foo:: = ()> used to make the stash temporarily
-anonymous while it was being emptied. Consequently, any of its
-subroutines referenced elsewhere would become anonymous, showing up as
-"(unknown)" in C<caller>. They now retain their package names such that
-C<caller> returns the original sub name if there is still a reference
-to its typeglob and "foo::__ANON__" otherwise [perl #79208].
-
-=head3 Dereferencing typeglobs
-
-If you assign a typeglob to a scalar variable:
-
- $glob = *foo;
-
-the glob that is copied to C<$glob> is marked with a special flag
-indicating that the glob is just a copy. This allows subsequent
-assignments to C<$glob> to overwrite the glob. The original glob,
-however, is immutable.
-
-Some Perl operators did not distinguish between these two types of globs.
-This would result in strange behaviour in edge cases: C<untie $scalar>
-would not untie the scalar if the last thing assigned to it was a glob
-(because it treated it as C<untie *$scalar>, which unties a handle).
-Assignment to a glob slot (such as C<*$glob = \@some_array>) would simply
-assign C<\@some_array> to C<$glob>.
-
-To fix this, the C<*{}> operator (including its C<*foo> and C<*$foo> forms)
-has been modified to make a new immutable glob if its operand is a glob
-copy. This allows operators that make a distinction between globs and
-scalars to be modified to treat only immutable globs as globs. (C<tie>,
-C<tied> and C<untie> have been left as they are for compatibility's sake,
-but will warn. See L</Deprecations>.)
-
-This causes an incompatible change in code that assigns a glob to the
-return value of C<*{}> when that operator was passed a glob copy. Take the
-following code, for instance:
-
- $glob = *foo;
- *$glob = *bar;
-
-The C<*$glob> on the second line returns a new immutable glob. That new
-glob is made an alias to C<*bar>. Then it is discarded. So the second
-assignment has no effect.
-
-See L<http://rt.perl.org/rt3/Public/Bug/Display.html?id=77810> for
-more detail.
-
-=head3 Magic variables outside the main package
-
-In previous versions of Perl, magic variables like C<$!>, C<%SIG>, etc. would
-"leak" into other packages. So C<%foo::SIG> could be used to access signals,
-C<${"foo::!"}> (with strict mode off) to access C's C<errno>, etc.
-
-This was a bug, or an "unintentional" feature, which caused various ill effects,
-such as signal handlers being wiped when modules were loaded, etc.
-
-This has been fixed (or the feature has been removed, depending on how you see
-it).
-
-=head3 local($_) strips all magic from $_
-
-local() on scalar variables gives them a new value but keeps all
-their magic intact. This has proven problematic for the default
-scalar variable $_, where L<perlsub> recommends that any subroutine
-that assigns to $_ should first localize it. This would throw an
-exception if $_ is aliased to a read-only variable, and could in general have
-various unintentional side-effects.
-
-Therefore, as an exception to the general rule, local($_) will not
-only assign a new value to $_, but also remove all existing magic from
-it as well.
-
-=head3 Parsing of package and variable names
-
-Parsing the names of packages and package variables has changed:
-multiple adjacent pairs of colons, as in C<foo::::bar>, are now all
-treated as package separators.
-
-Regardless of this change, the exact parsing of package separators has
-never been guaranteed and is subject to change in future Perl versions.
-
-=head2 Changes to Syntax or to Perl Operators
-
-=head3 C<given> return values
-
-C<given> blocks now return the last evaluated
-expression, or an empty list if the block was exited by C<break>. Thus you
-can now write:
-
- my $type = do {
- given ($num) {
- break when undef;
- "integer" when /^[+-]?[0-9]+$/;
- "float" when /^[+-]?[0-9]+(?:\.[0-9]+)?$/;
- "unknown";
- }
- };
-
-See L<perlsyn/Return value> for details.
-
-=head3 Change in parsing of certain prototypes
-
-Functions declared with the following prototypes now behave correctly as unary
-functions:
-
- *
- \$ \% \@ \* \&
- \[...]
- ;$ ;*
- ;\$ ;\% etc.
- ;\[...]
-
-Due to this bug fix [perl #75904], functions
-using the C<(*)>, C<(;$)> and C<(;*)> prototypes
-are parsed with higher precedence than before. So
-in the following example:
-
- sub foo($);
- foo $a < $b;
-
-the second line is now parsed correctly as C<< foo($a) < $b >>, rather than
-C<< foo($a < $b) >>. This happens when one of these operators is used in
-an unparenthesised argument:
-
- < > <= >= lt gt le ge
- == != <=> eq ne cmp ~~
- &
- | ^
- &&
- || //
- .. ...
- ?:
- = += -= *= etc.
-
-=head3 Smart-matching against array slices
-
-Previously, the following code resulted in a successful match:
-
- my @a = qw(a y0 z);
- my @b = qw(a x0 z);
- @a[0 .. $#b] ~~ @b;
-
-This odd behaviour has now been fixed [perl #77468].
-
-=head3 Negation treats strings differently from before
-
-The unary negation operator, C<->, now treats strings that look like numbers
-as numbers [perl #57706].
-
-=head3 Negative zero
-
-Negative zero (-0.0), when converted to a string, now becomes "0" on all
-platforms. It used to become "-0" on some, but "0" on others.
-
-If you still need to determine whether a zero is negative, use
-C<sprintf("%g", $zero) =~ /^-/> or the L<Data::Float> module on CPAN.
-
-=head3 C<:=> is now a syntax error
-
-Previously C<my $pi := 4> was exactly equivalent to C<my $pi : = 4>,
-with the C<:> being treated as the start of an attribute list, ending before
-the C<=>. The use of C<:=> to mean C<: => was deprecated in 5.12.0, and is
-now a syntax error. This allows future use of C<:=> as a new token.
-
-Outside the core's tests for it, we find no Perl 5 code on CPAN
-using this construction, so we believe that this change will have
-little impact on real-world codebases.
-
-If it is absolutely necessary to have empty attribute lists (for example,
-because of a code generator), simply avoid the error by adding a space before
-the C<=>.
-
-=head3 Change in the parsing of identifiers
-
-Characters outside the Unicode "XIDStart" set are no longer allowed at the
-beginning of an identifier. This means that certain accents and marks
-that normally follow an alphabetic character may no longer be the first
-character of an identifier.
-
-=head2 Threads and Processes
-
-=head3 Directory handles not copied to threads
-
-On systems other than Windows that do not have
-a C<fchdir> function, newly-created threads no
-longer inherit directory handles from their parent threads. Such programs
-would usually have crashed anyway [perl #75154].
-
-=head3 C<close> on shared pipes
-
-To avoid deadlocks, the C<close> function no longer waits for the
-child process to exit if the underlying file descriptor is still
-in use by another thread. It returns true in such cases.
-
-=head3 fork() emulation will not wait for signalled children
-
-On Windows parent processes would not terminate until all forked
-children had terminated first. However, C<kill("KILL", ...)> is
-inherently unstable on pseudo-processes, and C<kill("TERM", ...)>
-might not get delivered if the child is blocked in a system call.
-
-To avoid the deadlock and still provide a safe mechanism to terminate
-the hosting process, Perl now no longer waits for children that
-have been sent a SIGTERM signal. It is up to the parent process to
-waitpid() for these children if child-cleanup processing must be
-allowed to finish. However, it is also then the responsibility of the
-parent to avoid the deadlock by making sure the child process
-can't be blocked on I/O.
-
-See L<perlfork> for more information about the fork() emulation on
-Windows.
-
-=head2 Configuration
-
-=head3 Naming fixes in Policy_sh.SH may invalidate Policy.sh
-
-Several long-standing typos and naming confusions in F<Policy_sh.SH> have
-been fixed, standardizing on the variable names used in F<config.sh>.
-
-This will change the behaviour of F<Policy.sh> if you happen to have been
-accidentally relying on its incorrect behaviour.
-
-=head3 Perl source code is read in text mode on Windows
-
-Perl scripts used to be read in binary mode on Windows for the benefit
-of the L<ByteLoader> module (which is no longer part of core Perl). This
-had the side-effect of breaking various operations on the C<DATA> filehandle,
-including seek()/tell(), and even simply reading from C<DATA> after filehandles
-have been flushed by a call to system(), backticks, fork() etc.
-
-The default build options for Windows have been changed to read Perl source
-code on Windows in text mode now. L<ByteLoader> will (hopefully) be updated on
-CPAN to automatically handle this situation [perl #28106].
-
-=head1 Deprecations
-
-See also L</Deprecated C APIs>.
-
-=head2 Omitting a space between a regular expression and subsequent word
-
-Omitting the space between a regular expression operator or
-its modifiers and the following word is deprecated. For
-example, C<< m/foo/sand $bar >> is for now still parsed
-as C<< m/foo/s and $bar >>, but will now issue a warning.
-
-=head2 C<\cI<X>>
-
-The backslash-c construct was designed as a way of specifying
-non-printable characters, but there were no restrictions (on ASCII
-platforms) on what the character following the C<c> could be. Now,
-a deprecation warning is raised if that character isn't an ASCII character.
-Also, a deprecation warning is raised for C<"\c{"> (which is the same
-as simply saying C<";">).
-
-=head2 C<"\b{"> and C<"\B{">
-
-In regular expressions, a literal C<"{"> immediately following a C<"\b">
-(not in a bracketed character class) or a C<"\B{"> is now deprecated
-to allow for its future use by Perl itself.
-
-=head2 Deprecation warning added for deprecated-in-core Perl 4-era .pl libraries
-
-This is a mandatory warning, not obeying B<-X> or lexical warning bits.
-The warning is modelled on that supplied by F<deprecate.pm> for
-deprecated-in-core F<.pm> libraries. It points to the specific CPAN
-distribution that contains the F<.pl> libraries. The CPAN versions, of
-course, do not generate the warning.
-
-=head2 List assignment to C<$[>
-
-Assignment to C<$[> was deprecated and started to give warnings in
-Perl version 5.12.0. This version of Perl (5.14) now also emits a warning
-when assigning to C<$[> in list context. This fixes an oversight in 5.12.0.
-
-=head2 Use of qw(...) as parentheses
-
-Historically the parser fooled itself into thinking that C<qw(...)> literals
-were always enclosed in parentheses, and as a result you could sometimes omit
-parentheses around them:
-
- for $x qw(a b c) { ... }
-
-The parser no longer lies to itself in this way. Wrap the list literal in
-parentheses like this:
-
- for $x (qw(a b c)) { ... }
-
-This is being deprecated because C<qw(a b c)> is supposed to mean
-C<"a", "b", "c"> not C<("a", "b", "c")>. In other words, this doesn't compile:
-
- for my $i "a", "b", "c" { }
-
-So neither should this:
-
- for my $i qw(a b c) {}
-
-But these both work:
-
- for my $i ("a", "b", "c") { }
- for my $i (qw(a b c)) {}
-
-Note that this does not change the behaviour of cases like:
-
- use POSIX qw(setlocale localeconv)
- our @EXPORT = qw(foo bar baz);
-
-Where a list with or without parentheses could have been provided.
-
-=head2 C<\N{BELL}>
-
-This is because Unicode is using that name for a different character.
-See L</Unicode Version 6.0 is now supported (mostly)> for more
-explanation.
-
-=head2 C<?PATTERN?>
-
-C<?PATTERN?> (without the initial C<m>) has been deprecated and now produces
-a warning. This is to allow future use of C<?> in new operators.
-The match-once functionality is still available as C<m?PATTERN?>.
-
-=head2 Tie functions on scalars holding typeglobs
-
-Calling a tie function (C<tie>, C<tied>, C<untie>) with a scalar argument
-acts on a filehandle if the scalar happens to hold a typeglob.
-
-This is a long-standing bug that will be removed in Perl 5.16, as
-there is currently no way to tie the scalar itself when it holds
-a typeglob, and no way to untie a scalar that has had a typeglob
-assigned to it.
-
-Now there is a deprecation warning whenever a tie
-function is used on a handle without an explicit C<*>.
-
-=head2 User-defined case-mapping
-
-This feature is being deprecated due to its many issues, as documented in
-L<perlunicode/User-Defined Case Mappings (for serious hackers only)>.
-This feature will be removed in Perl 5.16. Instead use the CPAN module
-L<Unicode::Casing>, which provides improved functionality.
-
-=head2 Deprecated modules
-
-The following modules will be removed from the core distribution in a
-future release, and should be installed from CPAN instead. Distributions
-on CPAN that require these should add them to their prerequisites. The
-core versions of these modules now issue a deprecation warning.
-
-If you ship a packaged version of Perl, either alone or as part of a
-larger system, then you should carefully consider the repercussions of
-core module deprecations. You may want to consider shipping your default
-build of Perl with packages for some or all deprecated modules that
-install into C<vendor> or C<site> Perl library directories. This will
-inhibit the deprecation warnings.
-
-Alternatively, you may want to consider patching F<lib/deprecate.pm>
-to provide deprecation warnings specific to your packaging system
-or distribution of Perl, consistent with how your packaging system
-or distribution manages a staged transition from a release where the
-installation of a single package provides the given functionality, to
-a later release where the system administrator needs to know to install
-multiple packages to get that same functionality.
-
-You can silence these deprecation warnings by installing the modules
-in question from CPAN. To install the latest version of all of them,
-just install C<Task::Deprecations::5_14>.
-
-=over
-
-=item L<Devel::DProf>
-
-We strongly recommend that you install and use L<Devel::NYTProf> instead
-of L<Devel::Dprof>, as L<Devel::NYTProf> offers significantly
-improved profiling and reporting.
-
-=back
-
-=head1 Performance Enhancements
-
-=head2 "Safe signals" optimisation
-
-Signal dispatch has been moved from the runloop into control ops.
-This should give a few percent speed increase, and eliminates nearly
-all the speed penalty caused by the introduction of "safe signals"
-in 5.8.0. Signals should still be dispatched within the same
-statement as they were previously. If this does I<not> happen, or
-if you find it possible to create uninterruptible loops, this is a
-bug, and reports are encouraged of how to recreate such issues.
-
-=head2 Optimisation of shift() and pop() calls without arguments
-
-Two fewer OPs are used for shift() and pop() calls with no argument (with
-implicit C<@_>). This change makes shift() 5% faster than C<shift @_>
-on non-threaded perls, and 25% faster on threaded ones.
-
-=head2 Optimisation of regexp engine string comparison work
-
-The C<foldEQ_utf8> API function for case-insensitive comparison of strings (which
-is used heavily by the regexp engine) was substantially refactored and
-optimised -- and its documentation much improved as a free bonus.
-
-=head2 Regular expression compilation speed-up
-
-Compiling regular expressions has been made faster when upgrading
-the regex to utf8 is necessary but this isn't known when the compilation begins.
-
-=head2 String appending is 100 times faster
-
-When doing a lot of string appending, perls built to use the system's
-C<malloc> could end up allocating a lot more memory than needed in a
-inefficient way.
-
-C<sv_grow>, the function used to allocate more memory if necessary
-when appending to a string, has been taught to round up the memory
-it requests to a certain geometric progression, making it much faster on
-certain platforms and configurations. On Win32, it's now about 100 times
-faster.
-
-=head2 Eliminate C<PL_*> accessor functions under ithreads
-
-When C<MULTIPLICITY> was first developed, and interpreter state moved into
-an interpreter struct, thread- and interpreter-local C<PL_*> variables
-were defined as macros that called accessor functions (returning the
-address of the value) outside the Perl core. The intent was to allow
-members within the interpreter struct to change size without breaking
-binary compatibility, so that bug fixes could be merged to a maintenance
-branch that necessitated such a size change. This mechanism was redundant
-and penalised well-behaved code. It has been removed.
-
-=head2 Freeing weak references
-
-When there are many weak references to an object, freeing that object
-can under some circumstances take O(I<NE<0xB2>>) time to free, where
-I<N> is the number of references. The circumstances in which this can happen
-have been reduced [perl #75254]
-
-=head2 Lexical array and hash assignments
-
-An earlier optimisation to speed up C<my @array = ...> and
-C<my %hash = ...> assignments caused a bug and was disabled in Perl 5.12.0.
-
-Now we have found another way to speed up these assignments [perl #82110].
-
-=head2 C<@_> uses less memory
-
-Previously, C<@_> was allocated for every subroutine at compile time with
-enough space for four entries. Now this allocation is done on demand when
-the subroutine is called [perl #72416].
-
-=head2 Size optimisations to SV and HV structures
-
-C<xhv_fill> has been eliminated from C<struct xpvhv>, saving 1 IV per hash and
-on some systems will cause C<struct xpvhv> to become cache-aligned. To avoid
-this memory saving causing a slowdown elsewhere, boolean use of C<HvFILL>
-now calls C<HvTOTALKEYS> instead (which is equivalent), so while the fill
-data when actually required are now calculated on demand, cases when
-this needs to be done should be rare.
-
-The order of structure elements in SV bodies has changed. Effectively,
-the NV slot has swapped location with STASH and MAGIC. As all access to
-SV members is via macros, this should be completely transparent. This
-change allows the space saving for PVHVs documented above, and may reduce
-the memory allocation needed for PVIVs on some architectures.
-
-C<XPV>, C<XPVIV>, and C<XPVNV> now allocate only the parts of the C<SV> body
-they actually use, saving some space.
-
-Scalars containing regular expressions now allocate only the part of the C<SV>
-body they actually use, saving some space.
-
-=head2 Memory consumption improvements to Exporter
-
-The C<@EXPORT_FAIL> AV is no longer created unless needed, hence neither is
-the typeglob backing it. This saves about 200 bytes for every package that
-uses Exporter but doesn't use this functionality.
-
-=head2 Memory savings for weak references
-
-For weak references, the common case of just a single weak reference
-per referent has been optimised to reduce the storage required. In this
-case it saves the equivalent of one small Perl array per referent.
-
-=head2 C<%+> and C<%-> use less memory
-
-The bulk of the C<Tie::Hash::NamedCapture> module used to be in the Perl
-core. It has now been moved to an XS module to reduce overhead for
-programs that do not use C<%+> or C<%->.
-
-=head2 Multiple small improvements to threads
-
-The internal structures of threading now make fewer API calls and fewer
-allocations, resulting in noticeably smaller object code. Additionally,
-many thread context checks have been deferred so they're done only
-as needed (although this is only possible for non-debugging builds).
-
-=head2 Adjacent pairs of nextstate opcodes are now optimized away
-
-Previously, in code such as
-
- use constant DEBUG => 0;
-
- sub GAK {
- warn if DEBUG;
- print "stuff\n";
- }
-
-the ops for C<warn if DEBUG> would be folded to a C<null> op (C<ex-const>), but
-the C<nextstate> op would remain, resulting in a runtime op dispatch of
-C<nextstate>, C<nextstate>, etc.
-
-The execution of a sequence of C<nextstate> ops is indistinguishable from just
-the last C<nextstate> op so the peephole optimizer now eliminates the first of
-a pair of C<nextstate> ops except when the first carries a label, since labels
-must not be eliminated by the optimizer, and label usage isn't conclusively known
-at compile time.
-
-=head1 Modules and Pragmata
-
-=head2 New Modules and Pragmata
-
-=over 4
-
-=item *
-
-L<CPAN::Meta::YAML> 0.003 has been added as a dual-life module. It supports a
-subset of YAML sufficient for reading and writing F<META.yml> and F<MYMETA.yml> files
-included with CPAN distributions or generated by the module installation
-toolchain. It should not be used for any other general YAML parsing or
-generation task.
-
-=item *
-
-L<CPAN::Meta> version 2.110440 has been added as a dual-life module. It
-provides a standard library to read, interpret and write CPAN distribution
-metadata files (like F<META.json> and F<META.yml)> that describe a
-distribution, its contents, and the requirements for building it and
-installing it. The latest CPAN distribution metadata specification is
-included as L<CPAN::Meta::Spec> and notes on changes in the specification
-over time are given in L<CPAN::Meta::History>.
-
-=item *
-
-L<HTTP::Tiny> 0.012 has been added as a dual-life module. It is a very
-small, simple HTTP/1.1 client designed for simple GET requests and file
-mirroring. It has been added so that F<CPAN.pm> and L<CPANPLUS> can
-"bootstrap" HTTP access to CPAN using pure Perl without relying on external
-binaries like L<curl(1)> or L<wget(1)>.
-
-=item *
-
-L<JSON::PP> 2.27105 has been added as a dual-life module to allow CPAN
-clients to read F<META.json> files in CPAN distributions.
-
-=item *
-
-L<Module::Metadata> 1.000004 has been added as a dual-life module. It gathers
-package and POD information from Perl module files. It is a standalone module
-based on L<Module::Build::ModuleInfo> for use by other module installation
-toolchain components. L<Module::Build::ModuleInfo> has been deprecated in
-favor of this module instead.
-
-=item *
-
-L<Perl::OSType> 1.002 has been added as a dual-life module. It maps Perl
-operating system names (like "dragonfly" or "MSWin32") to more generic types
-with standardized names (like "Unix" or "Windows"). It has been refactored
-out of L<Module::Build> and L<ExtUtils::CBuilder> and consolidates such mappings into
-a single location for easier maintenance.
-
-=item *
-
-The following modules were added by the L<Unicode::Collate>
-upgrade. See below for details.
-
-L<Unicode::Collate::CJK::Big5>
-
-L<Unicode::Collate::CJK::GB2312>
-
-L<Unicode::Collate::CJK::JISX0208>
-
-L<Unicode::Collate::CJK::Korean>
-
-L<Unicode::Collate::CJK::Pinyin>
-
-L<Unicode::Collate::CJK::Stroke>
-
-=item *
-
-L<Version::Requirements> version 0.101020 has been added as a dual-life
-module. It provides a standard library to model and manipulates module
-prerequisites and version constraints defined in L<CPAN::Meta::Spec>.
-
-=back
-
-=head2 Updated Modules and Pragma
-
-=over 4
-
-=item *
-
-L<attributes> has been upgraded from version 0.12 to 0.14.
-
-=item *
-
-L<Archive::Extract> has been upgraded from version 0.38 to 0.48.
-
-Updates since 0.38 include: a safe print method that guards
-L<Archive::Extract> from changes to C<$\>; a fix to the tests when run in core
-Perl; support for TZ files; a modification for the lzma
-logic to favour L<IO::Uncompress::Unlzma>; and a fix
-for an issue with NetBSD-current and its new L<unzip(1)>
-executable.
-
-=item *
-
-L<Archive::Tar> has been upgraded from version 1.54 to 1.76.
-
-Important changes since 1.54 include the following:
-
-=over
-
-=item *
-
-Compatibility with busybox implementations of L<tar(1)>.
-
-=item *
-
-A fix so that write() and create_archive()
-close only filehandles they themselves opened.
-
-=item *
-
-A bug was fixed regarding the exit code of extract_archive.
-
-=item *
-
-The L<ptar(1)> utility has a new option to allow safe creation of
-tarballs without world-writable files on Windows, allowing those
-archives to be uploaded to CPAN.
-
-=item *
-
-A new L<ptargrep(1)> utility for using regular expressions against
-the contents of files in a tar archive.
-
-=item *
-
-L<pax> extended headers are now skipped.
-
-=back
-
-=item *
-
-L<Attribute::Handlers> has been upgraded from version 0.87 to 0.89.
-
-=item *
-
-L<autodie> has been upgraded from version 2.06_01 to 2.1001.
-
-=item *
-
-L<AutoLoader> has been upgraded from version 5.70 to 5.71.
-
-=item *
-
-The L<B> module has been upgraded from version 1.23 to 1.29.
-
-It no longer crashes when taking apart a C<y///> containing characters
-outside the octet range or compiled in a C<use utf8> scope.
-
-The size of the shared object has been reduced by about 40%, with no
-reduction in functionality.
-
-=item *
-
-L<B::Concise> has been upgraded from version 0.78 to 0.83.
-
-L<B::Concise> marks rv2sv(), rv2av(), and rv2hv() ops with the new
-C<OPpDEREF> flag as "DREFed".
-
-It no longer produces mangled output with the B<-tree> option
-[perl #80632].
-
-=item *
-
-L<B::Debug> has been upgraded from version 1.12 to 1.16.
-
-=item *
-
-L<B::Deparse> has been upgraded from version 0.96 to 1.03.
-
-The deparsing of a C<nextstate> op has changed when it has both a
-change of package relative to the previous nextstate, or a change of
-C<%^H> or other state and a label. The label was previously emitted
-first, but is now emitted last (5.12.1).
-
-The C<no 5.13.2> or similar form is now correctly handled by L<B::Deparse>
-(5.12.3).
-
-L<B::Deparse> now properly handles the code that applies a conditional
-pattern match against implicit C<$_> as it was fixed in [perl #20444].
-
-Deparsing of C<our> followed by a variable with funny characters
-(as permitted under the C<use utf8> pragma) has also been fixed [perl #33752].
-
-=item *
-
-L<B::Lint> has been upgraded from version 1.11_01 to 1.13.
-
-=item *
-
-L<base> has been upgraded from version 2.15 to 2.16.
-
-=item *
-
-L<Benchmark> has been upgraded from version 1.11 to 1.12.
-
-=item *
-
-L<bignum> has been upgraded from version 0.23 to 0.27.
-
-=item *
-
-L<Carp> has been upgraded from version 1.15 to 1.20.
-
-L<Carp> now detects incomplete L<caller()|perlfunc/"caller EXPR">
-overrides and avoids using bogus C<@DB::args>. To provide backtraces,
-Carp relies on particular behaviour of the caller() builtin.
-L<Carp> now detects if other code has overridden this with an
-incomplete implementation, and modifies its backtrace accordingly.
-Previously incomplete overrides would cause incorrect values in
-backtraces (best case), or obscure fatal errors (worst case).
-
-This fixes certain cases of "Bizarre copy of ARRAY" caused by modules
-overriding caller() incorrectly (5.12.2).
-
-It now also avoids using regular expressions that cause Perl to
-load its Unicode tables, so as to avoid the "BEGIN not safe after
-errors" error that ensue if there has been a syntax error
-[perl #82854].
-
-=item *
-
-L<CGI> has been upgraded from version 3.48 to 3.52.
-
-This provides the following security fixes: the MIME boundary in
-multipart_init() is now random and the handling of
-newlines embedded in header values has been improved.
-
-=item *
-
-L<Compress::Raw::Bzip2> has been upgraded from version 2.024 to 2.033.
-
-It has been updated to use L<bzip2(1)> 1.0.6.
-
-=item *
-
-L<Compress::Raw::Zlib> has been upgraded from version 2.024 to 2.033.
-
-=item *
-
-L<constant> has been upgraded from version 1.20 to 1.21.
-
-Unicode constants work once more. They have been broken since Perl 5.10.0
-[CPAN RT #67525].
-
-=item *
-
-L<CPAN> has been upgraded from version 1.94_56 to 1.9600.
-
-Major highlights:
-
-=over 4
-
-=item * much less configuration dialog hassle
-
-=item * support for F<META/MYMETA.json>
-
-=item * support for L<local::lib>
-
-=item * support for L<HTTP::Tiny> to reduce the dependency on FTP sites
-
-=item * automatic mirror selection
-
-=item * iron out all known bugs in configure_requires
-
-=item * support for distributions compressed with L<bzip2(1)>
-
-=item * allow F<Foo/Bar.pm> on the command line to mean C<Foo::Bar>
-
-=back
-
-=item *
-
-L<CPANPLUS> has been upgraded from version 0.90 to 0.9103.
-
-A change to F<cpanp-run-perl>
-resolves L<RT #55964|http://rt.cpan.org/Public/Bug/Display.html?id=55964>
-and L<RT #57106|http://rt.cpan.org/Public/Bug/Display.html?id=57106>, both
-of which related to failures to install distributions that use
-C<Module::Install::DSL> (5.12.2).
-
-A dependency on L<Config> was not recognised as a
-core module dependency. This has been fixed.
-
-L<CPANPLUS> now includes support for F<META.json> and F<MYMETA.json>.
-
-=item *
-
-L<CPANPLUS::Dist::Build> has been upgraded from version 0.46 to 0.54.
-
-=item *
-
-L<Data::Dumper> has been upgraded from version 2.125 to 2.130_02.
-
-The indentation used to be off when C<$Data::Dumper::Terse> was set. This
-has been fixed [perl #73604].
-
-This upgrade also fixes a crash when using custom sort functions that might
-cause the stack to change [perl #74170].
-
-L<Dumpxs> no longer crashes with globs returned by C<*$io_ref>
-[perl #72332].
-
-=item *
-
-L<DB_File> has been upgraded from version 1.820 to 1.821.
-
-=item *
-
-L<DBM_Filter> has been upgraded from version 0.03 to 0.04.
-
-=item *
-
-L<Devel::DProf> has been upgraded from version 20080331.00 to 20110228.00.
-
-Merely loading L<Devel::DProf> now no longer triggers profiling to start.
-Both C<use Devel::DProf> and C<perl -d:DProf ...> behave as before and start
-the profiler.
-
-B<NOTE>: L<Devel::DProf> is deprecated and will be removed from a future
-version of Perl. We strongly recommend that you install and use
-L<Devel::NYTProf> instead, as it offers significantly improved
-profiling and reporting.
-
-=item *
-
-L<Devel::Peek> has been upgraded from version 1.04 to 1.07.
-
-=item *
-
-L<Devel::SelfStubber> has been upgraded from version 1.03 to 1.05.
-
-=item *
-
-L<diagnostics> has been upgraded from version 1.19 to 1.22.
-
-It now renders pod links slightly better, and has been taught to find
-descriptions for messages that share their descriptions with other
-messages.
-
-=item *
-
-L<Digest::MD5> has been upgraded from version 2.39 to 2.51.
-
-It is now safe to use this module in combination with threads.
-
-=item *
-
-L<Digest::SHA> has been upgraded from version 5.47 to 5.61.
-
-L<shasum> now more closely mimics L<sha1sum(1)>/L<md5sum(1)>.
-
-L<Addfile> accepts all POSIX filenames.
-
-New SHA-512/224 and SHA-512/256 transforms (ref. NIST Draft FIPS 180-4
-[February 2011])
-
-=item *
-
-L<DirHandle> has been upgraded from version 1.03 to 1.04.
-
-=item *
-
-L<Dumpvalue> has been upgraded from version 1.13 to 1.16.
-
-=item *
-
-L<DynaLoader> has been upgraded from version 1.10 to 1.13.
-
-It fixes a buffer overflow when passed a very long file name.
-
-It no longer inherits from L<AutoLoader>; hence it no longer
-produces weird error messages for unsuccessful method calls on classes that
-inherit from L<DynaLoader> [perl #84358].
-
-=item *
-
-L<Encode> has been upgraded from version 2.39 to 2.42.
-
-Now, all 66 Unicode non-characters are treated the same way U+FFFF has
-always been treated: in cases when it was disallowed, all 66 are
-disallowed, and in cases where it warned, all 66 warn.
-
-=item *
-
-L<Env> has been upgraded from version 1.01 to 1.02.
-
-=item *
-
-L<Errno> has been upgraded from version 1.11 to 1.13.
-
-The implementation of L<Errno> has been refactored to use about 55% less memory.
-
-On some platforms with unusual header files, like Win32 L<gcc(1)> using C<mingw64>
-headers, some constants that weren't actually error numbers have been exposed
-by L<Errno>. This has been fixed [perl #77416].
-
-=item *
-
-L<Exporter> has been upgraded from version 5.64_01 to 5.64_03.
-
-Exporter no longer overrides C<$SIG{__WARN__}> [perl #74472]
-
-=item *
-
-L<ExtUtils::CBuilder> has been upgraded from version 0.27 to 0.280203.
-
-=item *
-
-L<ExtUtils::Command> has been upgraded from version 1.16 to 1.17.
-
-=item *
-
-L<ExtUtils::Constant> has been upgraded from 0.22 to 0.23.
-
-The L<AUTOLOAD> helper code generated by C<ExtUtils::Constant::ProxySubs>
-can now croak() for missing constants, or generate a complete C<AUTOLOAD>
-subroutine in XS, allowing simplification of many modules that use it
-(L<Fcntl>, L<File::Glob>, L<GDBM_File>, L<I18N::Langinfo>, L<POSIX>,
-L<Socket>).
-
-L<ExtUtils::Constant::ProxySubs> can now optionally push the names of all
-constants onto the package's C<@EXPORT_OK>.
-
-=item *
-
-L<ExtUtils::Install> has been upgraded from version 1.55 to 1.56.
-
-=item *
-
-L<ExtUtils::MakeMaker> has been upgraded from version 6.56 to 6.57_05.
-
-=item *
-
-L<ExtUtils::Manifest> has been upgraded from version 1.57 to 1.58.
-
-=item *
-
-L<ExtUtils::ParseXS> has been upgraded from version 2.21 to 2.2210.
-
-=item *
-
-L<Fcntl> has been upgraded from version 1.06 to 1.11.
-
-=item *
-
-L<File::Basename> has been upgraded from version 2.78 to 2.82.
-
-=item *
-
-L<File::CheckTree> has been upgraded from version 4.4 to 4.41.
-
-=item *
-
-L<File::Copy> has been upgraded from version 2.17 to 2.21.
-
-=item *
-
-L<File::DosGlob> has been upgraded from version 1.01 to 1.04.
-
-It allows patterns containing literal parentheses: they no longer need to
-be escaped. On Windows, it no longer
-adds an extra F<./> to file names
-returned when the pattern is a relative glob with a drive specification,
-like F<C:*.pl> [perl #71712].
-
-=item *
-
-L<File::Fetch> has been upgraded from version 0.24 to 0.32.
-
-L<HTTP::Lite> is now supported for the "http" scheme.
-
-The L<fetch(1)> utility is supported on FreeBSD, NetBSD, and
-Dragonfly BSD for the C<http> and C<ftp> schemes.
-
-=item *
-
-L<File::Find> has been upgraded from version 1.15 to 1.19.
-
-It improves handling of backslashes on Windows, so that paths like
-F<C:\dir\/file> are no longer generated [perl #71710].
-
-=item *
-
-L<File::Glob> has been upgraded from version 1.07 to 1.12.
-
-=item *
-
-L<File::Spec> has been upgraded from version 3.31 to 3.33.
-
-Several portability fixes were made in L<File::Spec::VMS>: a colon is now
-recognized as a delimiter in native filespecs; caret-escaped delimiters are
-recognized for better handling of extended filespecs; catpath() returns
-an empty directory rather than the current directory if the input directory
-name is empty; and abs2rel() properly handles Unix-style input (5.12.2).
-
-=item *
-
-L<File::stat> has been upgraded from 1.02 to 1.05.
-
-The C<-x> and C<-X> file test operators now work correctly when run
-by the superuser.
-
-=item *
-
-L<Filter::Simple> has been upgraded from version 0.84 to 0.86.
-
-=item *
-
-L<GDBM_File> has been upgraded from 1.10 to 1.14.
-
-This fixes a memory leak when DBM filters are used.
-
-=item *
-
-L<Hash::Util> has been upgraded from 0.07 to 0.11.
-
-L<Hash::Util> no longer emits spurious "uninitialized" warnings when
-recursively locking hashes that have undefined values [perl #74280].
-
-=item *
-
-L<Hash::Util::FieldHash> has been upgraded from version 1.04 to 1.09.
-
-=item *
-
-L<I18N::Collate> has been upgraded from version 1.01 to 1.02.
-
-=item *
-
-L<I18N::Langinfo> has been upgraded from version 0.03 to 0.08.
-
-langinfo() now defaults to using C<$_> if there is no argument given, just
-as the documentation has always claimed.
-
-=item *
-
-L<I18N::LangTags> has been upgraded from version 0.35 to 0.35_01.
-
-=item *
-
-L<if> has been upgraded from version 0.05 to 0.0601.
-
-=item *
-
-L<IO> has been upgraded from version 1.25_02 to 1.25_04.
-
-This version of L<IO> includes a new L<IO::Select>, which now allows L<IO::Handle>
-objects (and objects in derived classes) to be removed from an L<IO::Select> set
-even if the underlying file descriptor is closed or invalid.
-
-=item *
-
-L<IPC::Cmd> has been upgraded from version 0.54 to 0.70.
-
-Resolves an issue with splitting Win32 command lines. An argument
-consisting of the single character "0" used to be omitted (CPAN RT #62961).
-
-=item *
-
-L<IPC::Open3> has been upgraded from 1.05 to 1.09.
-
-open3() now produces an error if the C<exec> call fails, allowing this
-condition to be distinguished from a child process that exited with a
-non-zero status [perl #72016].
-
-The internal xclose() routine now knows how to handle file descriptors as
-documented, so duplicating C<STDIN> in a child process using its file
-descriptor now works [perl #76474].
-
-=item *
-
-L<IPC::SysV> has been upgraded from version 2.01 to 2.03.
-
-=item *
-
-L<lib> has been upgraded from version 0.62 to 0.63.
-
-=item *
-
-L<Locale::Maketext> has been upgraded from version 1.14 to 1.19.
-
-L<Locale::Maketext> now supports external caches.
-
-This upgrade also fixes an infinite loop in
-C<Locale::Maketext::Guts::_compile()> when
-working with tainted values (CPAN RT #40727).
-
-C<< ->maketext >> calls now back up and restore C<$@> so error
-messages are not suppressed (CPAN RT #34182).
-
-=item *
-
-L<Log::Message> has been upgraded from version 0.02 to 0.04.
-
-=item *
-
-L<Log::Message::Simple> has been upgraded from version 0.06 to 0.08.
-
-=item *
-
-L<Math::BigInt> has been upgraded from version 1.89_01 to 1.994.
-
-This fixes, among other things, incorrect results when computing binomial
-coefficients [perl #77640].
-
-It also prevents C<sqrt($int)> from crashing under C<use bigrat>.
-[perl #73534].
-
-=item *
-
-L<Math::BigInt::FastCalc> has been upgraded from version 0.19 to 0.28.
-
-=item *
-
-L<Math::BigRat> has been upgraded from version 0.24 to 0.26_02.
-
-=item *
-
-L<Memoize> has been upgraded from version 1.01_03 to 1.02.
-
-=item *
-
-L<MIME::Base64> has been upgraded from 3.08 to 3.13.
-
-Includes new functions to calculate the length of encoded and decoded
-base64 strings.
-
-Now provides encode_base64url() and decode_base64url() functions to process
-the base64 scheme for "URL applications".
-
-=item *
-
-L<Module::Build> has been upgraded from version 0.3603 to 0.3800.
-
-A notable change is the deprecation of several modules.
-L<Module::Build::Version> has been deprecated and L<Module::Build> now
-relies on the L<version> pragma directly. L<Module::Build::ModuleInfo> has
-been deprecated in favor of a standalone copy called L<Module::Metadata>.
-L<Module::Build::YAML> has been deprecated in favor of L<CPAN::Meta::YAML>.
-
-L<Module::Build> now also generates F<META.json> and F<MYMETA.json> files
-in accordance with version 2 of the CPAN distribution metadata specification,
-L<CPAN::Meta::Spec>. The older format F<META.yml> and F<MYMETA.yml> files are
-still generated.
-
-=item *
-
-L<Module::CoreList> has been upgraded from version 2.29 to 2.47.
-
-Besides listing the updated core modules of this release, it also stops listing
-the C<Filespec> module. That module never existed in core. The scripts
-generating L<Module::CoreList> confused it with L<VMS::Filespec>, which actually
-is a core module as of Perl 5.8.7.
-
-=item *
-
-L<Module::Load> has been upgraded from version 0.16 to 0.18.
-
-=item *
-
-L<Module::Load::Conditional> has been upgraded from version 0.34 to 0.44.
-
-=item *
-
-The L<mro> pragma has been upgraded from version 1.02 to 1.07.
-
-
-=item *
-
-L<NDBM_File> has been upgraded from version 1.08 to 1.12.
-
-This fixes a memory leak when DBM filters are used.
-
-=item *
-
-L<Net::Ping> has been upgraded from version 2.36 to 2.38.
-
-=item *
-
-L<NEXT> has been upgraded from version 0.64 to 0.65.
-
-=item *
-
-L<Object::Accessor> has been upgraded from version 0.36 to 0.38.
-
-=item *
-
-L<ODBM_File> has been upgraded from version 1.07 to 1.10.
-
-This fixes a memory leak when DBM filters are used.
-
-=item *
-
-L<Opcode> has been upgraded from version 1.15 to 1.18.
-
-=item *
-
-The L<overload> pragma has been upgraded from 1.10 to 1.13.
-
-C<overload::Method> can now handle subroutines that are themselves blessed
-into overloaded classes [perl #71998].
-
-The documentation has greatly improved. See L</Documentation> below.
-
-=item *
-
-L<Params::Check> has been upgraded from version 0.26 to 0.28.
-
-=item *
-
-The L<parent> pragma has been upgraded from version 0.223 to 0.225.
-
-=item *
-
-L<Parse::CPAN::Meta> has been upgraded from version 1.40 to 1.4401.
-
-The latest Parse::CPAN::Meta can now read YAML and JSON files using
-L<CPAN::Meta::YAML> and L<JSON::PP>, which are now part of the Perl core.
-
-=item *
-
-L<PerlIO::encoding> has been upgraded from version 0.12 to 0.14.
-
-=item *
-
-L<PerlIO::scalar> has been upgraded from 0.07 to 0.11.
-
-A read() after a seek() beyond the end of the string no longer thinks it
-has data to read [perl #78716].
-
-=item *
-
-L<PerlIO::via> has been upgraded from version 0.09 to 0.11.
-
-=item *
-
-L<Pod::Html> has been upgraded from version 1.09 to 1.11.
-
-=item *
-
-L<Pod::LaTeX> has been upgraded from version 0.58 to 0.59.
-
-=item *
-
-L<Pod::Perldoc> has been upgraded from version 3.15_02 to 3.15_03.
-
-=item *
-
-L<Pod::Simple> has been upgraded from version 3.13 to 3.16.
-
-=item *
-
-L<POSIX> has been upgraded from 1.19 to 1.24.
-
-It now includes constants for POSIX signal constants.
-
-=item *
-
-The L<re> pragma has been upgraded from version 0.11 to 0.18.
-
-The C<use re '/flags'> subpragma is new.
-
-The regmust() function used to crash when called on a regular expression
-belonging to a pluggable engine. Now it croaks instead.
-
-regmust() no longer leaks memory.
-
-=item *
-
-L<Safe> has been upgraded from version 2.25 to 2.29.
-
-Coderefs returned by reval() and rdo() are now wrapped via
-wrap_code_refs() (5.12.1).
-
-This fixes a possible infinite loop when looking for coderefs.
-
-It adds several C<version::vxs::*> routines to the default share.
-
-=item *
-
-L<SDBM_File> has been upgraded from version 1.06 to 1.09.
-
-=item *
-
-L<SelfLoader> has been upgraded from 1.17 to 1.18.
-
-It now works in taint mode [perl #72062].
-
-=item *
-
-The L<sigtrap> pragma has been upgraded from version 1.04 to 1.05.
-
-It no longer tries to modify read-only arguments when generating a
-backtrace [perl #72340].
-
-=item *
-
-L<Socket> has been upgraded from version 1.87 to 1.94.
-
-See L</Improved IPv6 support> above.
-
-=item *
-
-L<Storable> has been upgraded from version 2.22 to 2.27.
-
-Includes performance improvement for overloaded classes.
-
-This adds support for serialising code references that contain UTF-8 strings
-correctly. The L<Storable> minor version
-number changed as a result, meaning that
-L<Storable> users who set C<$Storable::accept_future_minor> to a C<FALSE> value
-will see errors (see L<Storable/FORWARD COMPATIBILITY> for more details).
-
-Freezing no longer gets confused if the Perl stack gets reallocated
-during freezing [perl #80074].
-
-=item *
-
-L<Sys::Hostname> has been upgraded from version 1.11 to 1.16.
-
-=item *
-
-L<Term::ANSIColor> has been upgraded from version 2.02 to 3.00.
-
-=item *
-
-L<Term::UI> has been upgraded from version 0.20 to 0.26.
-
-=item *
-
-L<Test::Harness> has been upgraded from version 3.17 to 3.23.
-
-=item *
-
-L<Test::Simple> has been upgraded from version 0.94 to 0.98.
-
-Among many other things, subtests without a C<plan> or C<no_plan> now have an
-implicit done_testing() added to them.
-
-=item *
-
-L<Thread::Semaphore> has been upgraded from version 2.09 to 2.12.
-
-It provides two new methods that give more control over the decrementing of
-semaphores: C<down_nb> and C<down_force>.
-
-=item *
-
-L<Thread::Queue> has been upgraded from version 2.11 to 2.12.
-
-=item *
-
-The L<threads> pragma has been upgraded from version 1.75 to 1.83.
-
-=item *
-
-The L<threads::shared> pragma has been upgraded from version 1.32 to 1.37.
-
-=item *
-
-L<Tie::Hash> has been upgraded from version 1.03 to 1.04.
-
-Calling C<< Tie::Hash->TIEHASH() >> used to loop forever. Now it C<croak>s.
-
-=item *
-
-L<Tie::Hash::NamedCapture> has been upgraded from version 0.06 to 0.08.
-
-=item *
-
-L<Tie::RefHash> has been upgraded from version 1.38 to 1.39.
-
-=item *
-
-L<Time::HiRes> has been upgraded from version 1.9719 to 1.9721_01.
-
-=item *
-
-L<Time::Local> has been upgraded from version 1.1901_01 to 1.2000.
-
-=item *
-
-L<Time::Piece> has been upgraded from version 1.15_01 to 1.20_01.
-
-=item *
-
-L<Unicode::Collate> has been upgraded from version 0.52_01 to 0.73.
-
-L<Unicode::Collate> has been updated to use Unicode 6.0.0.
-
-L<Unicode::Collate::Locale> now supports a plethora of new locales: I<ar, be,
-bg, de__phonebook, hu, hy, kk, mk, nso, om, tn, vi, hr, ig, ja, ko, ru, sq,
-se, sr, to, uk, zh, zh__big5han, zh__gb2312han, zh__pinyin>, and I<zh__stroke>.
-
-The following modules have been added:
-
-L<Unicode::Collate::CJK::Big5> for C<zh__big5han> which makes
-tailoring of CJK Unified Ideographs in the order of CLDR's big5han ordering.
-
-L<Unicode::Collate::CJK::GB2312> for C<zh__gb2312han> which makes
-tailoring of CJK Unified Ideographs in the order of CLDR's gb2312han ordering.
-
-L<Unicode::Collate::CJK::JISX0208> which makes tailoring of 6355 kanji
-(CJK Unified Ideographs) in the JIS X 0208 order.
-
-L<Unicode::Collate::CJK::Korean> which makes tailoring of CJK Unified Ideographs
-in the order of CLDR's Korean ordering.
-
-L<Unicode::Collate::CJK::Pinyin> for C<zh__pinyin> which makes
-tailoring of CJK Unified Ideographs in the order of CLDR's pinyin ordering.
-
-L<Unicode::Collate::CJK::Stroke> for C<zh__stroke> which makes
-tailoring of CJK Unified Ideographs in the order of CLDR's stroke ordering.
-
-This also sees the switch from using the pure-Perl version of this
-module to the XS version.
-
-=item *
-
-L<Unicode::Normalize> has been upgraded from version 1.03 to 1.10.
-
-=item *
-
-L<Unicode::UCD> has been upgraded from version 0.27 to 0.32.
-
-A new function, Unicode::UCD::num(), has been added. This function
-returns the numeric value of the string passed it or C<undef> if the string
-in its entirety has no "safe" numeric value. (For more detail, and for the
-definition of "safe", see L<Unicode::UCD/num>.)
-
-This upgrade also includes several bug fixes:
-
-=over 4
-
-=item charinfo()
-
-=over 4
-
-=item *
-
-It is now updated to Unicode Version 6.0.0 with I<Corrigendum #8>,
-excepting that, just as with Perl 5.14, the code point at U+1F514 has no name.
-
-=item *
-
-Hangul syllable code points have the correct names, and their
-decompositions are always output without requiring L<Lingua::KO::Hangul::Util>
-to be installed.
-
-=item *
-
-CJK (Chinese-Japanese-Korean) code points U+2A700 to U+2B734
-and U+2B740 to U+2B81D are now properly handled.
-
-=item *
-
-Numeric values are now output for those CJK code points that have them.
-
-=item *
-
-Names output for code points with multiple aliases are now the
-corrected ones.
-
-=back
-
-=item charscript()
-
-This now correctly returns "Unknown" instead of C<undef> for the script
-of a code point that hasn't been assigned another one.
-
-=item charblock()
-
-This now correctly returns "No_Block" instead of C<undef> for the block
-of a code point that hasn't been assigned to another one.
-
-=back
-
-=item *
-
-The L<version> pragma has been upgraded from 0.82 to 0.88.
-
-Because of a bug, now fixed, the is_strict() and is_lax() functions did not
-work when exported (5.12.1).
-
-=item *
-
-The L<warnings> pragma has been upgraded from version 1.09 to 1.12.
-
-Calling C<use warnings> without arguments is now significantly more efficient.
-
-=item *
-
-The L<warnings::register> pragma has been upgraded from version 1.01 to 1.02.
-
-It is now possible to register warning categories other than the names of
-packages using L<warnings::register>. See L<perllexwarn(1)> for more information.
-
-=item *
-
-L<XSLoader> has been upgraded from version 0.10 to 0.13.
-
-=item *
-
-L<VMS::DCLsym> has been upgraded from version 1.03 to 1.05.
-
-Two bugs have been fixed [perl #84086]:
-
-The symbol table name was lost when tying a hash, due to a thinko in
-C<TIEHASH>. The result was that all tied hashes interacted with the
-local symbol table.
-
-Unless a symbol table name had been explicitly specified in the call
-to the constructor, querying the special key C<:LOCAL> failed to
-identify objects connected to the local symbol table.
-
-=item *
-
-The L<Win32> module has been upgraded from version 0.39 to 0.44.
-
-This release has several new functions: Win32::GetSystemMetrics(),
-Win32::GetProductInfo(), Win32::GetOSDisplayName().
-
-The names returned by Win32::GetOSName() and Win32::GetOSDisplayName()
-have been corrected.
-
-=item *
-
-L<XS::Typemap> has been upgraded from version 0.03 to 0.05.
-
-=back
-
-=head2 Removed Modules and Pragmata
-
-As promised in Perl 5.12.0's release notes, the following modules have
-been removed from the core distribution, and if needed should be installed
-from CPAN instead.
-
-=over
-
-=item *
-
-L<Class::ISA> has been removed from the Perl core. Prior version was 0.36.
-
-=item *
-
-L<Pod::Plainer> has been removed from the Perl core. Prior version was 1.02.
-
-=item *
-
-L<Switch> has been removed from the Perl core. Prior version was 2.16.
-
-=back
-
-The removal of L<Shell> has been deferred until after 5.14, as the
-implementation of L<Shell> shipped with 5.12.0 did not correctly issue the
-warning that it was to be removed from core.
-
-=head1 Documentation
-
-=head2 New Documentation
-
-=head3 L<perlgpl>
-
-L<perlgpl> has been updated to contain GPL version 1, as is included in the
-F<README> distributed with Perl (5.12.1).
-
-=head3 Perl 5.12.x delta files
-
-The perldelta files for Perl 5.12.1 to 5.12.3 have been added from the
-maintenance branch: L<perl5121delta>, L<perl5122delta>, L<perl5123delta>.
-
-=head3 L<perlpodstyle>
-
-New style guide for POD documentation,
-split mostly from the NOTES section of the L<pod2man(1)> manpage.
-
-=head3 L<perlsource>, L<perlinterp>, L<perlhacktut>, and L<perlhacktips>
-
-See L</perlhack and perlrepository revamp>, below.
-
-=head2 Changes to Existing Documentation
-
-=head3 L<perlmodlib> is now complete
-
-The L<perlmodlib> manpage that came with Perl 5.12.0 was missing several
-modules due to a bug in the script that generates the list. This has been
-fixed [perl #74332] (5.12.1).
-
-=head3 Replace incorrect tr/// table in L<perlebcdic>
-
-L<perlebcdic> contains a helpful table to use in C<tr///> to convert
-between EBCDIC and Latin1/ASCII. The table was the inverse of the one
-it describes, though the code that used the table worked correctly for
-the specific example given.
-
-The table has been corrected and the sample code changed to correspond.
-
-The table has also been changed to hex from octal, and the recipes in the
-pod have been altered to print out leading zeros to make all values
-the same length.
-
-=head3 Tricks for user-defined casing
-
-L<perlunicode> now contains an explanation of how to override, mangle
-and otherwise tweak the way Perl handles upper-, lower- and other-case
-conversions on Unicode data, and how to provide scoped changes to alter
-one's own code's behaviour without stomping on anybody else's.
-
-=head3 INSTALL explicitly states that Perl requires a C89 compiler
-
-This was already true, but it's now Officially Stated For The Record
-(5.12.2).
-
-=head3 Explanation of C<\xI<HH>> and C<\oI<OOO>> escapes
-
-L<perlop> has been updated with more detailed explanation of these two
-character escapes.
-
-=head3 B<-0I<NNN>> switch
-
-In L<perlrun>, the behaviour of the B<-0NNN> switch for B<-0400> or higher
-has been clarified (5.12.2).
-
-=head3 Maintenance policy
-
-L<perlpolicy> now contains the policy on what patches are acceptable for
-maintenance branches (5.12.1).
-
-=head3 Deprecation policy
-
-L<perlpolicy> now contains the policy on compatibility and deprecation
-along with definitions of terms like "deprecation" (5.12.2).
-
-=head3 New descriptions in L<perldiag>
-
-The following existing diagnostics are now documented:
-
-=over 4
-
-=item *
-
-L<Ambiguous use of %c resolved as operator %c|perldiag/"Ambiguous use of %c resolved as operator %c">
-
-=item *
-
-L<Ambiguous use of %c{%s} resolved to %c%s|perldiag/"Ambiguous use of %c{%s} resolved to %c%s">
-
-
-=item *
-
-L<Ambiguous use of -%s resolved as -&%s()|perldiag/"Ambiguous use of -%s resolved as -&%s()">
-
-=item *
-
-L<Invalid strict version format (%s)|perldiag/"Invalid strict version format (%s)">
-
-=item *
-
-L<Invalid version format (%s)|perldiag/"Invalid version format (%s)">
-
-=item *
-
-L<Invalid version object|perldiag/"Invalid version object">
-
-=back
-
-=head3 L<perlbook>
-
-L<perlbook> has been expanded to cover many more popular books.
-
-=head3 C<SvTRUE> macro
-
-The documentation for the C<SvTRUE> macro in
-L<perlapi> was simply wrong in stating that
-get-magic is not processed. It has been corrected.
-
-=head3 L<perlvar> revamp
-
-L<perlvar> reorders the variables and groups them by topic. Each variable
-introduced after Perl 5.000 notes the first version in which it is
-available. L<perlvar> also has a new section for deprecated variables to
-note when they were removed.
-
-=head3 Array and hash slices in scalar context
-
-These are now documented in L<perldata>.
-
-=head3 C<use locale> and formats
-
-L<perlform> and L<perllocale> have been corrected to state that
-C<use locale> affects formats.
-
-=head3 L<overload>
-
-L<overload>'s documentation has practically undergone a rewrite. It
-is now much more straightforward and clear.
-
-=head3 perlhack and perlrepository revamp
-
-The L<perlhack> document is now much shorter, and focuses on the Perl 5
-development process and submitting patches to Perl. The technical content
-has been moved to several new documents, L<perlsource>, L<perlinterp>,
-L<perlhacktut>, and L<perlhacktips>. This technical content has
-been only lightly edited.
-
-The perlrepository document has been renamed to L<perlgit>. This new
-document is just a how-to on using git with the Perl source code.
-Any other content that used to be in perlrepository has been moved
-to L<perlhack>.
-
-=head3 Time::Piece examples
-
-Examples in L<perlfaq4> have been updated to show the use of
-L<Time::Piece>.
-
-=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 Errors
-
-=over
-
-=item Closure prototype called
-
-This error occurs when a subroutine reference passed to an attribute
-handler is called, if the subroutine is a closure [perl #68560].
-
-=item Insecure user-defined property %s
-
-Perl detected tainted data when trying to compile a regular
-expression that contains a call to a user-defined character property
-function, meaning C<\p{IsFoo}> or C<\p{InFoo}>.
-See L<perlunicode/User-Defined Character Properties> and L<perlsec>.
-
-=item panic: gp_free failed to free glob pointer - something is repeatedly re-creating entries
-
-This new error is triggered if a destructor called on an object in a
-typeglob that is being freed creates a new typeglob entry containing an
-object with a destructor that creates a new entry containing an object etc.
-
-=item Parsing code internal error (%s)
-
-This new fatal error is produced when parsing
-code supplied by an extension violates the
-parser's API in a detectable way.
-
-=item refcnt: fd %d%s
-
-This new error only occurs if a internal consistency check fails when a
-pipe is about to be closed.
-
-=item Regexp modifier "/%c" may not appear twice
-
-The regular expression pattern has one of the
-mutually exclusive modifiers repeated.
-
-=item Regexp modifiers "/%c" and "/%c" are mutually exclusive
-
-The regular expression pattern has more than one of the mutually
-exclusive modifiers.
-
-=item Using !~ with %s doesn't make sense
-
-This error occurs when C<!~> is used with C<s///r> or C<y///r>.
-
-=back
-
-=head3 New Warnings
-
-=over
-
-=item "\b{" is deprecated; use "\b\{" instead
-
-=item "\B{" is deprecated; use "\B\{" instead
-
-Use of an unescaped "{" immediately following a C<\b> or C<\B> is now
-deprecated in order to reserve its use for Perl itself in a future release.
-
-=item Operation "%s" returns its argument for ...
-
-Performing an operation requiring Unicode semantics (such as case-folding)
-on a Unicode surrogate or a non-Unicode character now triggers this
-warning.
-
-=item Use of qw(...) as parentheses is deprecated
-
-See L</"Use of qw(...) as parentheses">, above, for details.
-
-=back
-
-=head2 Changes to Existing Diagnostics
-
-=over 4
-
-=item *
-
-The "Variable $foo is not imported" warning that precedes a
-C<strict 'vars'> error has now been assigned the "misc" category, so that
-C<no warnings> will suppress it [perl #73712].
-
-=item *
-
-warn() and die() now produce "Wide character" warnings when fed a
-character outside the byte range if C<STDERR> is a byte-sized handle.
-
-=item *
-
-The "Layer does not match this perl" error message has been replaced with
-these more helpful messages [perl #73754]:
-
-=over 4
-
-=item *
-
-PerlIO layer function table size (%d) does not match size expected by this
-perl (%d)
-
-=item *
-
-PerlIO layer instance size (%d) does not match size expected by this perl
-(%d)
-
-=back
-
-=item *
-
-The "Found = in conditional" warning that is emitted when a constant is
-assigned to a variable in a condition is now withheld if the constant is
-actually a subroutine or one generated by C<use constant>, since the value
-of the constant may not be known at the time the program is written
-[perl #77762].
-
-=item *
-
-Previously, if none of the gethostbyaddr(), gethostbyname() and
-gethostent() functions were implemented on a given platform, they would
-all die with the message "Unsupported socket function 'gethostent' called",
-with analogous messages for getnet*() and getserv*(). This has been
-corrected.
-
-=item *
-
-The warning message about unrecognized regular expression escapes passed
-through has been changed to include any literal "{" following the
-two-character escape. For example, "\q{" is now emitted instead of "\q".
-
-=back
-
-=head1 Utility Changes
-
-=head3 L<perlbug(1)>
-
-=over 4
-
-=item *
-
-L<perlbug> now looks in the EMAIL environment variable for a return address
-if the REPLY-TO and REPLYTO variables are empty.
-
-=item *
-
-L<perlbug> did not previously generate a "From:" header, potentially
-resulting in dropped mail; it now includes that header.
-
-=item *
-
-The user's address is now used as the Return-Path.
-
-Many systems these days don't have a valid Internet domain name, and
-perlbug@perl.org does not accept email with a return-path that does
-not resolve. So the user's address is now passed to sendmail so it's
-less likely to get stuck in a mail queue somewhere [perl #82996].
-
-=item *
-
-L<perlbug> now always gives the reporter a chance to change the email
-address it guesses for them (5.12.2).
-
-=item *
-
-L<perlbug> should no longer warn about uninitialized values when using the B<-d>
-and B<-v> options (5.12.2).
-
-=back
-
-=head3 L<perl5db.pl>
-
-=over
-
-=item *
-
-The remote terminal works after forking and spawns new sessions, one
-per forked process.
-
-=back
-
-=head3 L<ptargrep>
-
-=over 4
-
-=item *
-
-L<ptargrep> is a new utility to apply pattern matching to the contents of
-files in a tar archive. It comes with C<Archive::Tar>.
-
-=back
-
-=head1 Configuration and Compilation
-
-See also L</"Naming fixes in Policy_sh.SH may invalidate Policy.sh">,
-above.
-
-=over 4
-
-=item *
-
-CCINCDIR and CCLIBDIR for the mingw64 cross-compiler are now correctly
-under F<$(CCHOME)\mingw\include> and F<\lib> rather than immediately below
-F<$(CCHOME)>.
-
-This means the "incpath", "libpth", "ldflags", "lddlflags" and
-"ldflags_nolargefiles" values in F<Config.pm> and F<Config_heavy.pl> are now
-set correctly.
-
-=item *
-
-C<make test.valgrind> has been adjusted to account for F<cpan/dist/ext>
-separation.
-
-=item *
-
-On compilers that support it, B<-Wwrite-strings> is now added to cflags by
-default.
-
-=item *
-
-The L<Encode> module can now (once again) be included in a static Perl
-build. The special-case handling for this situation got broken in Perl
-5.11.0, and has now been repaired.
-
-=item *
-
-The previous default size of a PerlIO buffer (4096 bytes) has been increased
-to the larger of 8192 bytes and your local BUFSIZ. Benchmarks show that doubling
-this decade-old default increases read and write performance by around
-25% to 50% when using the default layers of perlio on top of unix. To choose
-a non-default size, such as to get back the old value or to obtain an even
-larger value, configure with:
-
- ./Configure -Accflags=-DPERLIOBUF_DEFAULT_BUFSIZ=N
-
-where N is the desired size in bytes; it should probably be a multiple of
-your page size.
-
-=item *
-
-An "incompatible operand types" error in ternary expressions when building
-with C<clang> has been fixed (5.12.2).
-
-=item *
-
-Perl now skips setuid L<File::Copy> tests on partitions it detects mounted
-as C<nosuid> (5.12.2).
-
-=back
-
-=head1 Platform Support
-
-=head2 New Platforms
-
-=over 4
-
-=item AIX
-
-Perl now builds on AIX 4.2 (5.12.1).
-
-=back
-
-=head2 Discontinued Platforms
-
-=over 4
-
-=item Apollo DomainOS
-
-The last vestiges of support for this platform have been excised from
-the Perl distribution. It was officially discontinued in version 5.12.0.
-It had not worked for years before that.
-
-=item MacOS Classic
-
-The last vestiges of support for this platform have been excised from the
-Perl distribution. It was officially discontinued in an earlier version.
-
-=back
-
-=head2 Platform-Specific Notes
-
-=head3 AIX
-
-=over
-
-=item *
-
-F<README.aix> has been updated with information about the XL C/C++ V11 compiler
-suite (5.12.2).
-
-=back
-
-=head3 ARM
-
-=over
-
-=item *
-
-The C<d_u32align> configuration probe on ARM has been fixed (5.12.2).
-
-=back
-
-=head3 Cygwin
-
-=over 4
-
-=item *
-
-L<MakeMaker> has been updated to build manpages on cygwin.
-
-=item *
-
-Improved rebase behaviour
-
-If a DLL is updated on cygwin the old imagebase address is reused.
-This solves most rebase errors, especially when updating on core DLL's.
-See L<http://www.tishler.net/jason/software/rebase/rebase-2.4.2.README>
-for more information.
-
-=item *
-
-Support for the standard cygwin dll prefix (needed for FFIs)
-
-=item *
-
-Updated build hints file
-
-=back
-
-=head3 FreeBSD 7
-
-=over
-
-=item *
-
-FreeBSD 7 no longer contains F</usr/bin/objformat>. At build time,
-Perl now skips the F<objformat> check for versions 7 and higher and
-assumes ELF (5.12.1).
-
-=back
-
-=head3 HP-UX
-
-=over
-
-=item *
-
-Perl now allows B<-Duse64bitint> without promoting to C<use64bitall> on HP-UX
-(5.12.1).
-
-=back
-
-=head3 IRIX
-
-=over
-
-=item *
-
-Conversion of strings to floating-point numbers is now more accurate on
-IRIX systems [perl #32380].
-
-=back
-
-=head3 Mac OS X
-
-=over
-
-=item *
-
-Early versions of Mac OS X (Darwin) had buggy implementations of the
-setregid(), setreuid(), setrgid(,) and setruid() functions, so Perl
-would pretend they did not exist.
-
-These functions are now recognised on Mac OS 10.5 (Leopard; Darwin 9) and
-higher, as they have been fixed [perl #72990].
-
-=back
-
-=head3 MirBSD
-
-=over
-
-=item *
-
-Previously if you built Perl with a shared F<libperl.so> on MirBSD (the
-default config), it would work up to the installation; however, once
-installed, it would be unable to find F<libperl>. Path handling is now
-treated as in the other BSD dialects.
-
-=back
-
-=head3 NetBSD
-
-=over
-
-=item *
-
-The NetBSD hints file has been changed to make the system malloc the
-default.
-
-=back
-
-=head3 OpenBSD
-
-=over
-
-=item *
-
-OpenBSD E<gt> 3.7 has a new malloc implementation which is I<mmap>-based,
-and as such can release memory back to the OS; however, Perl's use of
-this malloc causes a substantial slowdown, so we now default to using
-Perl's malloc instead [perl #75742].
-
-=back
-
-=head3 OpenVOS
-
-=over
-
-=item *
-
-Perl now builds again with OpenVOS (formerly known as Stratus VOS)
-[perl #78132] (5.12.3).
-
-=back
-
-=head3 Solaris
-
-=over
-
-=item *
-
-DTrace is now supported on Solaris. There used to be build failures, but
-these have been fixed [perl #73630] (5.12.3).
-
-=back
-
-=head3 VMS
-
-=over
-
-=item *
-
-Extension building on older (pre 7.3-2) VMS systems was broken because
-configure.com hit the DCL symbol length limit of 1K. We now work within
-this limit when assembling the list of extensions in the core build (5.12.1).
-
-=item *
-
-We fixed configuring and building Perl with B<-Uuseperlio> (5.12.1).
-
-=item *
-
-C<PerlIOUnix_open> now honours the default permissions on VMS.
-
-When C<perlio> became the default and C<unix> became the default bottom layer,
-the most common path for creating files from Perl became C<PerlIOUnix_open>,
-which has always explicitly used C<0666> as the permission mask. This prevents
-inheriting permissions from RMS defaults and ACLs, so to avoid that problem,
-we now pass C<0777> to open(). In theVMS CRTL, C<0777> has a special
-meaning over and above intersecting with the current umask; specifically, it
-allows Unix syscalls to preserve native default permissions (5.12.3).
-
-=item *
-
-The shortening of symbols longer than 31 characters in the core C sources
-and in extensions is now by default done by the C compiler rather than by
-xsubpp (which could only do so for generated symbols in XS code). You can
-reenable xsubpp's symbol shortening by configuring with -Uuseshortenedsymbols,
-but you'll have some work to do to get the core sources to compile.
-
-=item *
-
-Record-oriented files (record format variable or variable with fixed control)
-opened for write by the C<perlio> layer will now be line-buffered to prevent the
-introduction of spurious line breaks whenever the perlio buffer fills up.
-
-=item *
-
-F<git_version.h> is now installed on VMS. This was an oversight in v5.12.0 which
-caused some extensions to fail to build (5.12.2).
-
-=item *
-
-Several memory leaks in L<stat()|perlfunc/"stat FILEHANDLE"> have been fixed (5.12.2).
-
-=item *
-
-A memory leak in Perl_rename() due to a double allocation has been
-fixed (5.12.2).
-
-=item *
-
-A memory leak in vms_fid_to_name() (used by realpath() and
-realname()> has been fixed (5.12.2).
-
-=back
-
-=head3 Windows
-
-See also L</"fork() emulation will not wait for signalled children"> and
-L</"Perl source code is read in text mode on Windows">, above.
-
-=over 4
-
-=item *
-
-Fixed build process for SDK2003SP1 compilers.
-
-=item *
-
-Compilation with Visual Studio 2010 is now supported.
-
-=item *
-
-When using old 32-bit compilers, the define C<_USE_32BIT_TIME_T> is now
-set in C<$Config{ccflags}>. This improves portability when compiling
-XS extensions using new compilers, but for a Perl compiled with old 32-bit
-compilers.
-
-=item *
-
-C<$Config{gccversion}> is now set correctly when Perl is built using the
-mingw64 compiler from L<http://mingw64.org> [perl #73754].
-
-=item *
-
-When building Perl with the mingw64 x64 cross-compiler C<incpath>,
-C<libpth>, C<ldflags>, C<lddlflags> and C<ldflags_nolargefiles> values
-in F<Config.pm> and F<Config_heavy.pl> were not previously being set
-correctly because, with that compiler, the include and lib directories
-are not immediately below C<$(CCHOME)> (5.12.2).
-
-=item *
-
-The build process proceeds more smoothly with mingw and dmake when
-F<C:\MSYS\bin> is in the PATH, due to a C<Cwd> fix.
-
-=item *
-
-Support for building with Visual C++ 2010 is now underway, but is not yet
-complete. See F<README.win32> or L<perlwin32> for more details.
-
-=item *
-
-The option to use an externally-supplied crypt(), or to build with no
-crypt() at all, has been removed. Perl supplies its own crypt()
-implementation for Windows, and the political situation that required
-this part of the distribution to sometimes be omitted is long gone.
-
-=back
-
-=head1 Internal Changes
-
-=head2 New APIs
-
-=head3 CLONE_PARAMS structure added to ease correct thread creation
-
-Modules that create threads should now create C<CLONE_PARAMS> structures
-by calling the new function Perl_clone_params_new(), and free them with
-Perl_clone_params_del(). This will ensure compatibility with any future
-changes to the internals of the C<CLONE_PARAMS> structure layout, and that
-it is correctly allocated and initialised.
-
-=head3 New parsing functions
-
-Several functions have been added for parsing statements or multiple
-statements:
-
-=over
-
-=item *
-
-C<parse_fullstmt> parses a complete Perl statement.
-
-=item *
-
-C<parse_stmtseq> parses a sequence of statements, up
-to closing brace or EOF.
-
-=item *
-
-C<parse_block> parses a block [perl #78222].
+=head1 Core Enhancements
-=item *
+=head2 C<CORE::> works on all keywords
-C<parse_barestmt> parses a statement
-without a label.
+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.
-=item *
+=head2 C<continue> no longer requires the "switch" feature
-C<parse_label> parses a statement label, separate from statements.
+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.
-=back
+=head2 C<$$> can be assigned to
-The
-L<C<parse_fullexpr()>|perlapi/parse_fullexpr>,
-L<C<parse_listexpr()>|perlapi/parse_listexpr>,
-L<C<parse_termexpr()>|perlapi/parse_termexpr>, and
-L<C<parse_arithexpr()>|perlapi/parse_arithexpr>
-functions have been added to the API. They run
-recursive-descent parsing of expressions at various precedence levels.
-They are expected to be used by syntax plugins.
+C<$$> 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.)
-See L<perlapi> for details.
+=head2 Features inside the debugger
-=head3 Hints hash API
+The current Perl's feature bundle is now enabled for commands entered in
+the interactive debugger.
-A new C API for introspecting the hinthash C<%^H> at runtime has been
-added. See C<cop_hints_2hv>, C<cop_hints_fetchpvn>, C<cop_hints_fetchpvs>,
-C<cop_hints_fetchsv>, and C<hv_copy_hints_hv> in L<perlapi> for details.
+=head2 C<\N{...}> can now have Unicode loose name matching
-A new, experimental API has been added for accessing the internal
-structure that Perl uses for C<%^H>. See the functions beginning with
-C<cophh_> in L<perlapi>.
+This is described in the C<charnames> item in
+L</Updated Modules and Pragmata> below.
-=head3 C interface to caller()
+=head2 Breakpoints with file names
-The C<caller_cx> function has been added as an XSUB-writer's equivalent of
-caller(). See L<perlapi> for details.
+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]">.
-=head3 Custom per-subroutine check hooks
+=head1 Security
-XS code in an extension module can now annotate a subroutine (whether
-implemented in XS or in Perl) so that nominated XS code will be called
-at compile time (specifically as part of op checking) to change the op
-tree of that subroutine. The compile-time check function (supplied by
-the extension module) can implement argument processing that can't be
-expressed as a prototype, generate customised compile-time warnings,
-perform constant folding for a pure function, inline a subroutine
-consisting of sufficiently simple ops, replace the whole call with a
-custom op, and so on. This was previously all possible by hooking the
-C<entersub> op checker, but the new mechanism makes it easy to tie the
-hook to a specific subroutine. See L<perlapi/cv_set_call_checker>.
+No changes since 5.14.0.
-To help in writing custom check hooks, several subtasks within standard
-C<entersub> op checking have been separated out and exposed in the API.
+=head1 Incompatible Changes
-=head3 Improved support for custom OPs
+=head2 Tying scalars that hold typeglobs
-Custom ops can now be registered with the new C<custom_op_register> C
-function and the C<XOP> structure. This will make it easier to add new
-properties of custom ops in the future. Two new properties have been added
-already, C<xop_class> and C<xop_peep>.
+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.
-C<xop_class> is one of the OA_*OP constants. It allows L<B> and other
-introspection mechanisms to work with custom ops
-that aren't BASEOPs. C<xop_peep> is a pointer to
-a function that will be called for ops of this
-type from C<Perl_rpeep>.
+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.
-See L<perlguts/Custom Operators> and L<perlapi/Custom Operators> for more
-detail.
+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>.
-The old C<PL_custom_op_names>/C<PL_custom_op_descs> interface is still
-supported but discouraged.
+=head2 IPC::Open3 no longer provides C<xfork()>, C<xclose_on_exec()>
+and C<xpipe_anon()>
-=head3 Scope hooks
+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.
-It is now possible for XS code to hook into Perl's lexical scope
-mechanism at compile time, using the new C<Perl_blockhook_register>
-function. See L<perlguts/"Compile-time scope hooks">.
+=head2 C<$$> no longer caches PID
-=head3 The recursive part of the peephole optimizer is now hookable
+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.
-In addition to C<PL_peepp>, for hooking into the toplevel peephole optimizer, a
-C<PL_rpeepp> is now available to hook into the optimizer recursing into
-side-chains of the optree.
+=head1 Deprecations
-=head3 New non-magical variants of existing functions
+There have been no deprecations since 5.14.0.
-The following functions/macros have been added to the API. The C<*_nomg>
-macros are equivalent to their non-C<_nomg> variants, except that they ignore
-C<get-magic>. Those ending in C<_flags> allow one to specify whether
-C<get-magic> is processed.
+=head1 Performance Enhancements
- sv_2bool_flags
- SvTRUE_nomg
- sv_2nv_flags
- SvNV_nomg
- sv_cmp_flags
- sv_cmp_locale_flags
- sv_eq_flags
- sv_collxfrm_flags
+There are no benchmarked enhancements since 5.14.0.
-In some of these cases, the non-C<_flags> functions have
-been replaced with wrappers around the new functions.
+=head1 Modules and Pragmata
-=head3 pv/pvs/sv versions of existing functions
+=head2 New Modules and Pragmata
-Many functions ending with pvn now have equivalent C<pv/pvs/sv> versions.
+None.
-=head3 List op-building functions
+=head2 Updated Modules and Pragmata
-List op-building functions have been added to the
-API. See L<op_append_elem|perlapi/op_append_elem>,
-L<op_append_list|perlapi/op_append_list>, and
-L<op_prepend_elem|perlapi/op_prepend_elem> in L<perlapi>.
+=over 4
-=head3 C<LINKLIST>
+=item *
-The L<LINKLIST|perlapi/LINKLIST> macro, part of op building that
-constructs the execution-order op chain, has been added to the API.
+L<charnames> has been updated from version 1.18 to version 1.22
-=head3 Localisation functions
+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>.
-The C<save_freeop>, C<save_op>, C<save_pushi32ptr> and C<save_pushptrptr>
-functions have been added to the API.
+=item *
-=head3 Stash names
+L<constant> has been updated from version 1.21 to 1.22.
-A stash can now have a list of effective names in addition to its usual
-name. The first effective name can be accessed via the C<HvENAME> macro,
-which is now the recommended name to use in MRO linearisations (C<HvNAME>
-being a fallback if there is no C<HvENAME>).
+=item *
-These names are added and deleted via C<hv_ename_add> and
-C<hv_ename_delete>. These two functions are I<not> part of the API.
+L<Archive::Extract> has been upgraded from version 0.48 to version 0.52
-=head3 New functions for finding and removing magic
+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>.
-The L<C<mg_findext()>|perlapi/mg_findext> and
-L<C<sv_unmagicext()>|perlapi/sv_unmagicext>
-functions have been added to the API.
-They allow extension authors to find and remove magic attached to
-scalars based on both the magic type and the magic virtual table, similar to how
-sv_magicext() attaches magic of a certain type and with a given virtual table
-to a scalar. This eliminates the need for extensions to walk the list of
-C<MAGIC> pointers of an C<SV> to find the magic that belongs to them.
+=item *
-=head3 C<find_rundefsv>
+L<Attribute::Handlers> updated from version 0.88 to 0.91
-This function returns the SV representing C<$_>, whether it's lexical
-or dynamic.
+=item *
-=head3 C<Perl_croak_no_modify>
+L<B> has been upgraded from version 1.29 to version 1.30.
-Perl_croak_no_modify() is short-hand for
-C<Perl_croak("%s", PL_no_modify)>.
+=item *
-=head3 C<PERL_STATIC_INLINE> define
+L<B::Deparse> has been upgraded from version 1.03 to 1.05. (Perl 5.14.1
+had version 1.04.)
-The C<PERL_STATIC_INLINE> define has been added to provide the best-guess
-incantation to use for static inline functions, if the C compiler supports
-C99-style static inline. If it doesn't, it'll give a plain C<static>.
+It addresses two regressions in Perl 5.14.0:
-C<HAS_STATIC_INLINE> can be used to check if the compiler actually supports
-inline functions.
+=over
-=head3 New C<pv_escape> option for hexadecimal escapes
+=item *
-A new option, C<PERL_PV_ESCAPE_NONASCII>, has been added to C<pv_escape> to
-dump all characters above ASCII in hexadecimal. Before, one could get all
-characters as hexadecimal or the Latin1 non-ASCII as octal.
+Deparsing of the C<glob> operator and its diamond (C<< <> >>) form now
+works again [perl #90898] (5.14.1).
-=head3 C<lex_start>
+=item *
-C<lex_start> has been added to the API, but is considered experimental.
+The presence of subroutines named C<::::> or C<::::::> no longer causes
+B::Deparse to hang (5.14.1).
-=head3 op_scope() and op_lvalue()
+=back
-The op_scope() and op_lvalue() functions have been added to the API,
-but are considered experimental.
+Plus a few other bugs:
-=head2 C API Changes
+=over
-=head3 C<PERL_POLLUTE> has been removed
+=item *
-The option to define C<PERL_POLLUTE> to expose older 5.005 symbols for
-backwards compatibility has been removed. Its use was always discouraged,
-and MakeMaker contains a more specific escape hatch:
+Deparsing of handle C<keys>, C<each> and C<value> with a scalar argument
+now works [perl #91008].
- perl Makefile.PL POLLUTE=1
+=item *
-This can be used for modules that have not been upgraded to 5.6 naming
-conventions (and really should be completely obsolete by now).
+C<readpipe> followed by a complex expression (as opposed to a simple scalar
+variable) now works.
-=head3 Check API compatibility when loading XS modules
+=item *
-When Perl's API changes in incompatible ways (which usually happens between
-major releases), XS modules compiled for previous versions of Perl will no
-longer work. They need to be recompiled against the new Perl.
+It now puts C<CORE::> in front of overridable core keywords if they
+conflict with user-defined subroutines.
-The C<XS_APIVERSION_BOOTCHECK> macro has been added to ensure that modules
-are recompiled and to prevent users from accidentally loading modules
-compiled for old perls into newer perls. That macro, which is called when
-loading every newly compiled extension, compares the API version of the
-running perl with the version a module has been compiled for and raises an
-exception if they don't match.
+=item *
-=head3 Perl_fetch_cop_label
+Deparsing assignment to an lvalue method specified as a variable
+(C<< $obj->$method = ... >>) used not to work [perl #62498].
-The first argument of the C API function C<Perl_fetch_cop_label> has changed
-from C<struct refcounted he *> to C<COP *>, to insulate the user from
-implementation details.
+=back
-This API function was marked as "may change", and likely isn't in use outside
-the core. (Neither an unpacked CPAN nor Google's codesearch finds any other
-references to it.)
+=item *
-=head3 GvCV() and GvGP() are no longer lvalues
+L<CGI> has been upgraded from version 3.52 to version 3.54
-The new GvCV_set() and GvGP_set() macros are now provided to replace
-assignment to those two macros.
+The DELETE HTTP verb is now supported.
-This allows a future commit to eliminate some backref magic between GV
-and CVs, which will require complete control over assignment to the
-C<gp_cv> slot.
+=item *
-=head3 CvGV() is no longer an lvalue
+L<Compress::Zlib> has been upgraded from version 2.033 to version 2.035
-Under some circumstances, the CvGV() field of a CV is now
-reference-counted. To ensure consistent behaviour, direct assignment to
-it, for example C<CvGV(cv) = gv> is now a compile-time error. A new macro,
-C<CvGV_set(cv,gv)> has been introduced to run this operation
-safely. Note that modification of this field is not part of the public
-API, regardless of this new macro (and despite its being listed in this section).
+=item *
-=head3 CvSTASH() is no longer an lvalue
+L<Compress::Raw::Bzip2> has been upgraded from version 2.033 to version 2.035
-The CvSTASH() macro can now only be used as an rvalue. CvSTASH_set()
-has been added to replace assignment to CvSTASH(). This is to ensure
-that backreferences are handled properly. These macros are not part of the
-API.
+=item *
-=head3 Calling conventions for C<newFOROP> and C<newWHILEOP>
+L<Compress::Raw::Zlib> has been upgraded from version 2.033 to version 2.035
-The way the parser handles labels has been cleaned up and refactored. As a
-result, the newFOROP() constructor function no longer takes a parameter
-stating what label is to go in the state op.
+=item *
-The newWHILEOP() and newFOROP() functions no longer accept a line
-number as a parameter.
+L<CPAN::Meta> has been upgraded from version 2.110440 to version 2.110930
-=head3 Flags passed to C<uvuni_to_utf8_flags> and C<utf8n_to_uvuni>
+=item *
-Some of the flags parameters to uvuni_to_utf8_flags() and
-utf8n_to_uvuni() have changed. This is a result of Perl's now allowing
-internal storage and manipulation of code points that are problematic
-in some situations. Hence, the default actions for these functions has
-been complemented to allow these code points. The new flags are
-documented in L<perlapi>. Code that requires the problematic code
-points to be rejected needs to change to use the new flags. Some flag
-names are retained for backward source compatibility, though they do
-nothing, as they are now the default. However the flags
-C<UNICODE_ALLOW_FDD0>, C<UNICODE_ALLOW_FFFF>, C<UNICODE_ILLEGAL>, and
-C<UNICODE_IS_ILLEGAL> have been removed, as they stem from a
-fundamentally broken model of how the Unicode non-character code points
-should be handled, which is now described in
-L<perlunicode/Non-character code points>. See also the Unicode section
-under L</Selected Bug Fixes>.
+L<CPANPLUS> has been upgraded from version 0.9103 to version 0.9105
-=head2 Deprecated C APIs
+Now understands specifying modules to install in the format 'Module/Type.pm'
-=over
+=item *
-=item C<Perl_ptr_table_clear>
+L<CPANPLUS::Dist::Build> has been upgraded from version 0.54 to version 0.56
-C<Perl_ptr_table_clear> is no longer part of Perl's public API. Calling it
-now generates a deprecation warning, and it will be removed in a future
-release.
+=item *
-=item C<sv_compile_2op>
+L<Data::Dumper> has been upgraded from version 2.128 to 2.131.
-The sv_compile_2op() API function is now deprecated. Searches suggest
-that nothing on CPAN is using it, so this should have zero impact.
+=item *
-It attempted to provide an API to compile code down to an optree, but failed
-to bind correctly to lexicals in the enclosing scope. It's not possible to
-fix this problem within the constraints of its parameters and return value.
+L<DB_File> has been upgraded from version 1.821 to version 1.822
-=item C<find_rundefsvoffset>
+Warnings are now in sync with perl's
-The C<find_rundefsvoffset> function has been deprecated. It appeared that
-its design was insufficient for reliably getting the lexical C<$_> at
-run-time.
+=item *
-Use the new C<find_rundefsv> function or the C<UNDERBAR> macro
-instead. They directly return the right SV
-representing C<$_>, whether it's
-lexical or dynamic.
+L<Digest::SHA> has been upgraded from version 5.61 to version 5.62
-=item C<CALL_FPTR> and C<CPERLscope>
+No longer loads L<MIME::Base64> as this was unnecessary.
-Those are left from an old implementation of C<MULTIPLICITY> using C++ objects,
-which was removed in Perl 5.8. Nowadays these macros do exactly nothing, so
-they shouldn't be used anymore.
+=item *
-For compatibility, they are still defined for external C<XS> code. Only
-extensions defining C<PERL_CORE> must be updated now.
+L<Devel::Peek> has been upgraded from version 1.07 to 1.08.
-=back
+Its C<fill_mstats> function no longer refuses to write to copy-on-write
+scalars.
-=head2 Other Internal Changes
+=item *
-=head3 Stack unwinding
+L<Encode> has been upgraded from version 2.42 to version 2.43
-The protocol for unwinding the C stack at the last stage of a C<die>
-has changed how it identifies the target stack frame. This now uses
-a separate variable C<PL_restartjmpenv>, where previously it relied on
-the C<blk_eval.cur_top_env> pointer in the C<eval> context frame that
-has nominally just been discarded. This change means that code running
-during various stages of Perl-level unwinding no longer needs to take
-care to avoid destroying the ghost frame.
+Missing aliases added, a deep recursion error fixed and various
+documentation updates.
-=head3 Scope stack entries
+=item *
-The format of entries on the scope stack has been changed, resulting in a
-reduction of memory usage of about 10%. In particular, the memory used by
-the scope stack to record each active lexical variable has been halved.
+L<ExtUtils::CBuilder> updated from version 0.280203 to 0.280204. The new version
+append CFLAGS and LDFLAGS to their Config.pm counterparts.
-=head3 Memory allocation for pointer tables
+=item *
-Memory allocation for pointer tables has been changed. Previously
-C<Perl_ptr_table_store> allocated memory from the same arena system as
-C<SV> bodies and C<HE>s, with freed memory remaining bound to those arenas
-until interpreter exit. Now it allocates memory from arenas private to the
-specific pointer table, and that memory is returned to the system when
-C<Perl_ptr_table_free> is called. Additionally, allocation and release are
-both less CPU intensive.
+L<Filter::Util::Call> has been upgraded from version 1.08 to version 1.39
-=head3 C<UNDERBAR>
+C<decrypt> fixed to work with v5.14.0
-The C<UNDERBAR> macro now calls C<find_rundefsv>. C<dUNDERBAR> is now a
-noop but should still be used to ensure past and future compatibility.
+=item *
-=head3 String comparison routines renamed
+L<Filter::Simple> updated from version 0.85 to 0.87
-The C<ibcmp_*> functions have been renamed and are now called C<foldEQ>,
-C<foldEQ_locale>, and C<foldEQ_utf8>. The old names are still available as
-macros.
+=item *
-=head3 C<chop> and C<chomp> implementations merged
+L<FindBin> updated from version 1.50 to 1.51.
-The opcode bodies for C<chop> and C<chomp> and for C<schop> and C<schomp>
-have been merged. The implementation functions Perl_do_chop() and
-Perl_do_chomp(), never part of the public API, have been merged and
-moved to a static function in F<pp.c>. This shrinks the Perl binary
-slightly, and should not affect any code outside the core (unless it is
-relying on the order of side-effects when C<chomp> is passed a I<list> of
-values).
+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.
-=head1 Selected Bug Fixes
+=item *
-=head2 I/O
+L<JSON::PP> has been upgraded from version 2.27105 to version 2.27200
-=over 4
+Fixed C<incr_parse> decoding string more correctly.
=item *
-Perl no longer produces this warning:
+L<I18N::LangTags> has been upgraded from version 0.35_01 to version 0.36.
- $ perl -we 'open(my $f, ">", \my $x); binmode($f, "scalar")'
- Use of uninitialized value in binmode at -e line 1.
+Fix broken URLs for RFCs.
=item *
-Opening a glob reference via C<< open($fh, ">", \*glob) >> no longer
-causes the glob to be corrupted when the filehandle is printed to. This would
-cause Perl to crash whenever the glob's contents were accessed
-[perl #77492].
-
-=item *
+L<IPC::Open3> has been upgraded from version 1.10 to version 1.11.
-PerlIO no longer crashes when called recursively, such as from a signal
-handler. Now it just leaks memory [perl #75556].
+=over 4
=item *
-Most I/O functions were not warning for unopened handles unless the
-"closed" and "unopened" warnings categories were both enabled. Now only
-C<use warnings 'unopened'> is necessary to trigger these warnings, as
-had always been the intention.
+Fixes a bug which prevented use of C<open3> on Windows when C<*STDIN>,
+C<*STDOUT> or C<*STDERR> had been localized.
=item *
-There have been several fixes to PerlIO layers:
+Fixes a bug which prevented duplicating numeric file descriptors on Windows.
-When C<binmode(FH, ":crlf")> pushes the C<:crlf> layer on top of the stack,
-it no longer enables crlf layers lower in the stack so as to avoid
-unexpected results [perl #38456].
+=back
-Opening a file in C<:raw> mode now does what it advertises to do (first
-open the file, then C<binmode> it), instead of simply leaving off the top
-layer [perl #80764].
+=item *
-The three layers C<:pop>, C<:utf8>, and C<:bytes> didn't allow stacking when
-opening a file. For example
-this:
+L<Math::BigFloat> has been upgraded from version 1.993 to 1.994.
- open(FH, ">:pop:perlio", "some.file") or die $!;
+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].
-would throw an "Invalid argument" error. This has been fixed in this
-release [perl #82484].
+=item *
-=back
+L<Math::BigInt> has been upgraded from version 1.994 to 1.995.
-=head2 Regular Expression Bug Fixes
+It provides a new C<bsgn> method that complements the C<babs> method.
-=over
+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 *
-The regular expression engine no longer loops when matching
-C<"\N{LATIN SMALL LIGATURE FF}" =~ /f+/i> and similar expressions
-[perl #72998] (5.12.1).
-
-=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.
-The trie runtime code should no longer allocate massive amounts of memory,
-fixing #74484.
+Fixes include: correct copy constructor usage; fix polarwise formatting with
+numeric format specifier; and more stable C<great_circle_direction> algorithm.
=item *
-Syntax errors in C<< (?{...}) >> blocks no longer cause panic messages
-[perl #2353].
+L<Module::CoreList> has been upgraded from version 2.49 to 2.51.
-=item *
-
-A pattern like C<(?:(o){2})?> no longer causes a "panic" error
-[perl #39233].
+Updated for v5.12.4, v5.14.1 and v5.15.0
=item *
-A fatal error in regular expressions containing C<(.*?)> when processing
-UTF-8 data has been fixed [perl #75680] (5.12.2).
+L<mro> has been updated to remove two broken URLs in the documentation.
=item *
-An erroneous regular expression engine optimisation that caused regex verbs like
-C<*COMMIT> sometimes to be ignored has been removed.
-
-=item *
+L<Object::Accessor> has been upgraded from version 0.38 to version 0.42
-The regular expression bracketed character class C<[\8\9]> was effectively the
-same as C<[89\000]>, incorrectly matching a NULL character. It also gave
-incorrect warnings that the C<8> and C<9> were ignored. Now C<[\8\9]> is the
-same as C<[89]> and gives legitimate warnings that C<\8> and C<\9> are
-unrecognized escape sequences, passed-through.
+Eliminated use of C<exists> on array elements which has been deprecated.
=item *
-A regular expression match in the right-hand side of a global substitution
-(C<s///g>) that is in the same scope will no longer cause match variables
-to have the wrong values on subsequent iterations. This can happen when an
-array or hash subscript is interpolated in the right-hand side, as in
-C<s|(.)|@a{ print($1), /./ }|g> [perl #19078].
+L<ODBM_File> has been upgraded from version 1.10 to version 1.11.
-=item *
-
-Several cases in which characters in the Latin-1 non-ASCII range (0x80 to
-0xFF) used not to match themselves, or used to match both a character class
-and its complement, have been fixed. For instance, U+00E2 could match both
-C<\w> and C<\W> [perl #78464] [perl #18281] [perl #60156].
+The XS code is now compiled with C<PERL_NO_GET_CONTEXT>, which will aid
+performance under ithreads.
=item *
-Matching a Unicode character against an alternation containing characters
-that happened to match continuation bytes in the former's UTF8
-representation (like C<qq{\x{30ab}} =~ /\xab|\xa9/>) would cause erroneous
-warnings [perl #70998].
+L<PerlIO::encoding> has been upgraded from version 0.14 to 0.15
=item *
-The trie optimisation was not taking empty groups into account, preventing
-"foo" from matching C</\A(?:(?:)foo|bar|zot)\z/> [perl #78356].
+L<PerlIO::scalar> has been upgraded from version 0.11 to 0.12.
-=item *
+It fixes a problem with C<< open my $fh, ">", \$scalar >> not working if
+C<$scalar> is a copy-on-write scalar.
-A pattern containing a C<+> inside a lookahead would sometimes cause an
-incorrect match failure in a global match (for example, C</(?=(\S+))/g>)
-[perl #68564].
+It also fixes a hang that occurs with C<readline> or C<< <$fh> >> if a
+typeglob has been assigned to $scalar [perl #92258].
=item *
-A regular expression optimisation would sometimes cause a match with a
-C<{n,m}> quantifier to fail when it should have matched [perl #79152].
-
-=item *
+L<Pod::Perldoc> has been upgraded from version 3.15_03 to 3.15_05.
-Case-insensitive matching in regular expressions compiled under
-C<use locale> now works much more sanely when the pattern or target
-string is internally encoded in UTF8. Previously, under these
-conditions the localeness was completely lost. Now, code points
-above 255 are treated as Unicode, but code points between 0 and 255
-are treated using the current locale rules, regardless of whether
-the pattern or the string is encoded in UTF8. The few case-insensitive
-matches that cross the 255/256 boundary are not allowed. For
-example, 0xFF does not caselessly match the character at 0x178,
-LATIN CAPITAL LETTER Y WITH DIAERESIS, because 0xFF may not be LATIN
-SMALL LETTER Y in the current locale, and Perl has no way of knowing
-if that character even exists in the locale, much less what code
-point it is.
+It corrects the search paths on VMS [perl #90640]. (5.14.1)
=item *
-The C<(?|...)> regular expression construct no longer crashes if the final
-branch has more sets of capturing parentheses than any other branch. This
-was fixed in Perl 5.10.1 for the case of a single branch, but that fix did
-not take multiple branches into account [perl #84746].
-
-=item *
+L<Storable> has been upgraded from version 2.27 to version 2.28.
-A bug has been fixed in the implementation of C<{...}> quantifiers in
-regular expressions that prevented the code block in
-C</((\w+)(?{ print $2 })){2}/> from seeing the C<$2> sometimes
-[perl #84294].
+It no longer turns copy-on-write scalars into read-only scalars when
+freezing and thawing.
-=back
+=item *
-=head2 Syntax/Parsing Bugs
+L<Sys::Syslog> has been upgraded from version 0.27 to version 0.29
-=over
+Large number of Request Tickets resolved.
=item *
-C<when (scalar) {...}> no longer crashes, but produces a syntax error
-[perl #74114] (5.12.1).
-
-=item *
+L<Time::HiRes> has been upgraded from version 1.9721_01 to version 1.9722.
-A label right before a string eval (C<foo: eval $string>) no longer causes
-the label to be associated also with the first statement inside the eval
-[perl #74290] (5.12.1).
+Portability fix, and avoiding some compiler warnings.
=item *
-The C<no 5.13.2> form of C<no> no longer tries to turn on features or
-pragmata (like L<strict>) [perl #70075] (5.12.2).
+L<Unicode::Collate> has been upgraded from version 0.73 to version 0.76
-=item *
-
-C<BEGIN {require 5.12.0}> now behaves as documented, rather than behaving
-identically to C<use 5.12.0>. Previously, C<require> in a C<BEGIN> block
-was erroneously executing the C<use feature ':5.12.0'> and
-C<use strict> behaviour, which only C<use> was documented to
-provide [perl #69050].
+Updated to CLDR 1.9.1
=item *
-A regression introduced in Perl 5.12.0, making
-C<< my $x = 3; $x = length(undef) >> result in C<$x> set to C<3> has been
-fixed. C<$x> will now be C<undef> [perl #85508] (5.12.2).
-
-=item *
+L<Unicode::Normalize> has been upgraded from version 1.10 to version 1.12
-When strict "refs" mode is off, C<%{...}> in rvalue context returns
-C<undef> if its argument is undefined. An optimisation introduced in Perl
-5.12.0 to make C<keys %{...}> faster when used as a boolean did not take
-this into account, causing C<keys %{+undef}> (and C<keys %$foo> when
-C<$foo> is undefined) to be an error, which it should be so in strict
-mode only [perl #81750].
+Fixes for the removal of F<unicore/CompositionExclusions.txt> from core.
=item *
-Constant-folding used to cause
+L<XSLoader> has been upgraded from version 0.13 to version 0.15
- $text =~ ( 1 ? /phoo/ : /bear/)
+=back
-to turn into
+=head2 Removed Modules and Pragmata
- $text =~ /phoo/
+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.
-at compile time. Now it correctly matches against C<$_> [perl #20444].
+=over
=item *
-Parsing Perl code (either with string C<eval> or by loading modules) from
-within a C<UNITCHECK> block no longer causes the interpreter to crash
-[perl #70614].
+C<Devel::DProf> has been removed from the Perl core. Prior version was 20110228.00.
=item *
-String C<eval>s no longer fail after 2 billion scopes have been
-compiled [perl #83364].
-
-=item *
+C<Shell> has been removed from the Perl core. Prior version was 0.72_01.
-The parser no longer hangs when encountering certain Unicode characters,
-such as U+387 [perl #74022].
+=back
-=item *
+=head1 Documentation
-Defining a constant with the same name as one of Perl's special blocks
-(like C<INIT>) stopped working in 5.12.0, but has now been fixed
-[perl #78634].
+=head2 New Documentation
-=item *
+None.
-A reference to a literal value used as a hash key (C<$hash{\"foo"}>) used
-to be stringified, even if the hash was tied [perl #79178].
+=head2 Changes to Existing Documentation
-=item *
+=head3 L<perlfork>
-A closure containing an C<if> statement followed by a constant or variable
-is no longer treated as a constant [perl #63540].
+=over
=item *
-C<state> can now be used with attributes. It
-used to mean the same thing as
-C<my> if any attributes were present [perl #68658].
+Added portability caveats related to using C<kill> on forked process.
-=item *
+=back
-Expressions like C<< @$a > 3 >> no longer cause C<$a> to be mentioned in
-the "Use of uninitialized value in numeric gt" warning when C<$a> is
-undefined (since it is not part of the C<< > >> expression, but the operand
-of the C<@>) [perl #72090].
+=head3 L<perlfunc>
-=item *
+=over
-Accessing an element of a package array with a hard-coded number (as
-opposed to an arbitrary expression) would crash if the array did not exist.
-Usually the array would be autovivified during compilation, but typeglob
-manipulation could remove it, as in these two cases which used to crash:
+=item *
- *d = *a; print $d[0];
- undef *d; print $d[0];
+Documentation for C<use> now includes a pointer to F<if.pm> (5.14.1)
=item *
-The B<-C> command-line option, when used on the shebang line, can now be
-followed by other options [perl #72434].
+C<given>, C<when> and C<default> are now listed in L<perlfunc> (5.14.1).
=item *
-The C<B> module was returning C<B::OP>s instead of C<B::LOGOP>s for
-C<entertry> [perl #80622]. This was due to a bug in the Perl core,
-not in C<B> itself.
+The examples for the C<select> function no longer use strings for file
+handles.
=back
-=head2 Stashes, Globs and Method Lookup
-
-Perl 5.10.0 introduced a new internal mechanism for caching MROs (method
-resolution orders, or lists of parent classes; aka "isa" caches) to make
-method lookup faster (so C<@ISA> arrays would not have to be searched
-repeatedly). Unfortunately, this brought with it quite a few bugs. Almost
-all of these have been fixed now, along with a few MRO-related bugs that
-existed before 5.10.0:
+=head3 L<perlguts>
=over
=item *
-The following used to have erratic effects on method resolution, because
-the "isa" caches were not reset or otherwise ended up listing the wrong
-classes. These have been fixed.
-
-=over
-
-=item Aliasing packages by assigning to globs [perl #77358]
+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].
-=item Deleting packages by deleting their containing stash elements
+=back
-=item Undefining the glob containing a package (C<undef *Foo::>)
+=head3 L<perllol>
-=item Undefining an ISA glob (C<undef *Foo::ISA>)
+=over
-=item Deleting an ISA stash element (C<delete $Foo::{ISA}>)
+=item *
-=item Sharing @ISA arrays between classes (via C<*Foo::ISA = \@Bar::ISA> or
-C<*Foo::ISA = *Bar::ISA>) [perl #77238]
+L<perllol> has been expanded with examples using the new C<push $scalar>
+syntax introduced in Perl 5.14.0 (5.14.1).
=back
-C<undef *Foo::ISA> would even stop a new C<@Foo::ISA> array from updating
-caches.
-
-=item *
+=head3 L<perlmod>
-Typeglob assignments would crash if the glob's stash no longer existed, so
-long as the glob assigned to were named C<ISA> or the glob on either side of
-the assignment contained a subroutine.
+=over
=item *
-C<PL_isarev>, which is accessible to Perl via C<mro::get_isarev> is now
-updated properly when packages are deleted or removed from the C<@ISA> of
-other classes. This allows many packages to be created and deleted without
-causing a memory leak [perl #75176].
+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].
=back
-In addition, various other bugs related to typeglobs and stashes have been
-fixed:
+=head3 L<perlop>
-=over
+=over 4
=item *
-Some work has been done on the internal pointers that link between symbol
-tables (stashes), typeglobs, and subroutines. This has the effect that
-various edge cases related to deleting stashes or stash entries (for example,
-<%FOO:: = ()>), and complex typeglob or code-reference aliasing, will no
-longer crash the interpreter.
+The explanation of bitwise operators has been expanded to explain how they
+work on Unicode strings (5.14.1).
=item *
-Assigning a reference to a glob copy now assigns to a glob slot instead of
-overwriting the glob with a scalar [perl #1804] [perl #77508].
+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).
=item *
-A bug when replacing the glob of a loop variable within the loop has been fixed
-[perl #21469]. This
-means the following code will no longer crash:
-
- for $x (...) {
- *x = *y;
- }
+More examples for C<m//g> have been added (5.14.1).
=item *
-Assigning a glob to a PVLV used to convert it to a plain string. Now it
-works correctly, and a PVLV can hold a glob. This would happen when a
-nonexistent hash or array element was passed to a subroutine:
+The C<<< <<\FOO >>> here-doc syntax has been documented (5.14.1).
- sub { $_[0] = *foo }->($hash{key});
- # $_[0] would have been the string "*main::foo"
+=back
+
+=head3 L<perlpodstyle>
-It also happened when a glob was assigned to, or returned from, an element
-of a tied array or hash [perl #36051].
+=over 4
=item *
-When trying to report C<Use of uninitialized value $Foo::BAR>, crashes could
-occur if the glob holding the global variable in question had been detached
-from its original stash by, for example, C<delete $::{"Foo::"}>. This has
-been fixed by disabling the reporting of variable names in those
-cases.
+The tips on which formatting codes to use have been corrected and greatly
+expanded.
=item *
-During the restoration of a localised typeglob on scope exit, any
-destructors called as a result would be able to see the typeglob in an
-inconsistent state, containing freed entries, which could result in a
-crash. This would affect code like this:
+There are now a couple of example one-liners for previewing POD files after
+they have been edited.
- local *@;
- eval { die bless [] }; # puts an object in $@
- sub DESTROY {
- local $@; # boom
- }
-
-Now the glob entries are cleared before any destructors are called. This
-also means that destructors can vivify entries in the glob. So Perl tries
-again and, if the entries are re-created too many times, dies with a
-"panic: gp_free ..." error message.
+=back
-=item *
+=head3 L<perlsub>
-If a typeglob is freed while a subroutine attached to it is still
-referenced elsewhere, the subroutine is renamed to C<__ANON__> in the same
-package, unless the package has been undefined, in which case the C<__ANON__>
-package is used. This could cause packages to be sometimes autovivified,
-such as if the package had been deleted. Now this no longer occurs.
-The C<__ANON__> package is also now used when the original package is
-no longer attached to the symbol table. This avoids memory leaks in some
-cases [perl #87664].
+=over
=item *
-Subroutines and package variables inside a package whose name ends with
-C<::> can now be accessed with a fully qualified name.
+The L<perlsub/"Lvalue subroutines"> section has been amended to reflect
+changes and bug fixes introduced in Perl 5.15.0.
=back
-=head2 Unicode
+=head3 L<perlre>
=over
=item *
-What has become known as "the Unicode Bug" is almost completely resolved in
-this release. Under C<use feature 'unicode_strings'> (which is
-automatically selected by C<use 5.012> and above), the internal
-storage format of a string no longer affects the external semantics.
-[perl #58182].
+The C<(*COMMIT)> directive is now listed in the right section
+(L<Verbs without an argument|perlre/Verbs without an argument>).
-There are two known exceptions:
-
-=over
+=back
-=item 1
+=head3 L<perlrun>
-The now-deprecated, user-defined case-changing
-functions require utf8-encoded strings to operate. The CPAN module
-L<Unicode::Casing> has been written to replace this feature without its
-drawbacks, and the feature is scheduled to be removed in 5.16.
+=over
-=item 2
+=item *
-quotemeta() (and its in-line equivalent C<\Q>) can also give different
-results depending on whether a string is encoded in UTF-8. See
-L<perlunicode/The "Unicode Bug">.
+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).
=back
-=item *
+=head3 L<perltie>
-Handling of Unicode non-character code points has changed.
-Previously they were mostly considered illegal, except that in some
-place only one of the 66 of them was known. The Unicode Standard
-considers them all legal, but forbids their "open interchange".
-This is part of the change to allow internal use of any code
-point (see L</Core Enhancements>). Together, these changes resolve
-[perl #38722], [perl #51918], [perl #51936], and [perl #63446].
+=over
=item *
-Case-insensitive C<"/i"> regular expression matching of Unicode
-characters that match multiple characters now works much more as
-intended. For example
-
- "\N{LATIN SMALL LIGATURE FFI}" =~ /ffi/ui
+Documented the required syntax for tying handles.
-and
-
- "ffi" =~ /\N{LATIN SMALL LIGATURE FFI}/ui
-
-are both true. Previously, there were many bugs with this feature.
-What hasn't been fixed are the places where the pattern contains the
-multiple characters, but the characters are split up by other things,
-such as in
+=back
- "\N{LATIN SMALL LIGATURE FFI}" =~ /(f)(f)i/ui
+=head3 L<perlvar>
-or
+=over
- "\N{LATIN SMALL LIGATURE FFI}" =~ /ffi*/ui
+=item *
-or
+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].
- "\N{LATIN SMALL LIGATURE FFI}" =~ /[a-f][f-m][g-z]/ui
+=item *
-None of these match.
+Documentation for L<$$|perlvar/$$> has been amended with additional
+cautions regarding changing the process ID.
-Also, this matching doesn't fully conform to the current Unicode
-Standard, which asks that the matching be made upon the NFD
-(Normalization Form Decomposed) of the text. However, as of this
-writing (April 2010), the Unicode Standard is currently in flux about
-what they will recommend doing with regard in such scenarios. It may be
-that they will throw out the whole concept of multi-character matches.
-[perl #71736].
+=back
-=item *
+=head3 L<POSIX>
-Naming a deprecated character in C<\N{I<NAME>}> no longer leaks memory.
+=over
=item *
-We fixed a bug that could cause C<\N{I<NAME>}> constructs followed by
-a single C<"."> to be parsed incorrectly [perl #74978] (5.12.1).
+The invocation documentation for C<WIFEXITED>, C<WEXITSTATUS>,
+C<WIFSIGNALED>, C<WTERMSIG>, C<WIFSTOPPED>, and C<WSTOPSIG> has been
+corrected (5.14.1).
-=item *
+=back
-C<chop> now correctly handles characters above C<"\x{7fffffff}">
-[perl #73246].
+=head1 Diagnostics
-=item *
+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>.
-Passing to C<index> an offset beyond the end of the string when the string
-is encoded internally in UTF8 no longer causes panics [perl #75898].
+=head2 New Diagnostics
-=item *
+=head3 New Warnings
-warn() and die() now respect utf8-encoded scalars [perl #45549].
+=over 4
-=item *
+=item L<Useless assignment to a temporary|perldiag/"Useless assignment to a temporary">
-Sometimes the UTF8 length cache would not be reset on a value
-returned by substr, causing C<length(substr($uni_string, ...))> to give
-wrong answers. With C<${^UTF8CACHE}> set to -1, it would also produce
-a "panic" error message [perl #77692].
+Assigning to a temporary returned from an XS lvalue subroutine now produces a
+warning [perl #31946].
=back
-=head2 Ties, Overloading and Other Magic
-
-=over
-
-=item *
-
-Overloading now works properly in conjunction with tied
-variables. What formerly happened was that most ops checked their
-arguments for overloading I<before> checking for magic, so for example
-an overloaded object returned by a tied array access would usually be
-treated as not overloaded [RT #57012].
+=head2 Changes to Existing Diagnostics
-=item *
+None.
-Various instances of magic (like tie methods) being called on tied variables
-too many or too few times have been fixed:
+=head1 Utility Changes
-=over
+None.
-=item *
+=head1 Configuration and Compilation
-C<< $tied->() >> did not always call FETCH [perl #8438].
+=over 4
=item *
-Filetest operators and C<y///> and C<tr///> were calling FETCH too
-many times.
+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 *
-The C<=> operator used to ignore magic on its right-hand side if the
-scalar happened to hold a typeglob (if a typeglob was the last thing
-returned from or assigned to a tied scalar) [perl #77498].
+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 *
-Dereference operators used to ignore magic if the argument was a
-reference already (such as from a previous FETCH) [perl #72144].
+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 *
-C<splice> now calls C<set-magic> (so changes made
-by C<splice @ISA> are respected by method calls) [perl #78400].
+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 *
-In-memory files created by C<< open($fh, ">", \$buffer) >> were not calling
-FETCH/STORE at all [perl #43789] (5.12.2).
+Building with C<-DPERL_GLOBAL_STRUCT> works again. This configuration is not
+generally used.
=item *
-utf8::is_utf8() now respects C<get-magic> (like C<$1>) (5.12.1).
+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
-=item *
+=head1 Testing
-Non-commutative binary operators used to swap their operands if the same
-tied scalar was used for both operands and returned a different value for
-each FETCH. For instance, if C<$t> returned 2 the first time and 3 the
-second, then C<$t/$t> would evaluate to 1.5. This has been fixed
-[perl #87708].
+There have been no significant changes to the process for testing a
+newly-built perl.
-=item *
+See the source code commit history for changes to individual test files.
-String C<eval> now detects taintedness of overloaded or tied
-arguments [perl #75716].
+=head1 Platform Support
-=item *
+=head2 New Platforms
-String C<eval> and regular expression matches against objects with string
-overloading no longer cause memory corruption or crashes [perl #77084].
+None.
-=item *
+=head2 Discontinued Platforms
-L<readline|perlfunc/"readline EXPR"> now honors C<< <> >> overloading on tied
-arguments.
+None.
-=item *
+=head2 Platform-Specific Notes
-C<< <expr> >> always respects overloading now if the expression is
-overloaded.
+=head3 GNU/Hurd
-Because "S<< <> as >> glob" was parsed differently from
-"S<< <> as >> filehandle" from 5.6 onwards, something like C<< <$foo[0]> >> did
-not handle overloading, even if C<$foo[0]> was an overloaded object. This
-was contrary to the documentation for L<overload>, and meant that C<< <> >>
-could not be used as a general overloaded iterator operator.
+=over
=item *
-The fallback behaviour of overloading on binary operators was asymmetric
-[perl #71286].
+No longer overrides possible extra $ccflags values given to Configure
+on GNU/Hurd. C.f. Bug-Debian: http://bugs.debian.org/587901
-=item *
-
-Magic applied to variables in the main package no longer affects other packages.
-See L</Magic variables outside the main package> above [perl #76138].
+=back
-=item *
+=head3 Mac OS X
-Sometimes magic (ties, taintedness, etc.) attached to variables could cause
-an object to last longer than it should, or cause a crash if a tied
-variable were freed from within a tie method. These have been fixed
-[perl #81230].
+=over
=item *
-DESTROY methods of objects implementing ties are no longer able to crash by
-accessing the tied variable through a weak reference [perl #86328].
+Clarified Apple Developer Tools requirements in F<README.macosx>
=item *
-Fixed a regression of kill() when a match variable is used for the
-process ID to kill [perl #75812].
-
-=item *
+Mac OS X specific compilation instructions have been clarified (5.14.1)
-C<$AUTOLOAD> used to remain tainted forever if it ever became tainted. Now
-it is correctly untainted if an autoloaded method is called and the method
-name was not tainted.
+=back
-=item *
+=head3 MSWin32
-C<sprintf> now dies when passed a tainted scalar for the format. It did
-already die for arbitrary expressions, but not for simple scalars
-[perl #82250].
+=over
=item *
-C<lc>, C<uc>, C<lcfirst>, and C<ucfirst> no longer return untainted strings
-when the argument is tainted. This has been broken since perl 5.8.9
-[perl #87336].
+Supplied F<makefile.mk> patched to support gcc-4.x.x and README.win32
+updated accordingly. [perl #91354]
=back
-=head2 The Debugger
+=head3 Solaris
=over
=item *
-The Perl debugger now also works in taint mode [perl #76872].
+Updated the list of required packages for building perl to reflect Solaris 9
+and 10 in README.solaris [perl #90850] (5.14.1)
-=item *
+=back
-Subroutine redefinition works once more in the debugger [perl #48332].
+=head3 Ubuntu Linux
+
+=over 4
=item *
-When B<-d> is used on the shebang (C<#!>) line, the debugger now has access
-to the lines of the main program. In the past, this sometimes worked and
-sometimes did not, depending on the order in which things happened to be
-arranged in memory [perl #71806].
+The L<ODBM_File> installation process has been updated with the new library
+paths on Ubuntu natty [perl #90106] (5.14.1)
=item *
-A possible memory leak when using L<caller()|perlfunc/"caller EXPR"> to set
-C<@DB::args> has been fixed (5.12.2).
+I<h2ph> now gets the include paths from gcc correctly. This stopped
+working when Ubuntu switched to a "multiarch" setup [perl #90122].
-=item *
+=back
-Perl no longer stomps on C<$DB::single>, C<$DB::trace>, and C<$DB::signal>
-if these variables already have values when C<$^P> is assigned to [perl #72422].
+=head1 Internal Changes
-=item *
+=over 4
-C<#line> directives in string evals were not properly updating the arrays
-of lines of code (C<< @{"_< ..."} >>) that the debugger (or any debugging or
-profiling module) uses. In threaded builds, they were not being updated at
-all. In non-threaded builds, the line number was ignored, so any change to
-the existing line number would cause the lines to be misnumbered
-[perl #79442].
+=item *
-=back
+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)
-=head2 Threads
+=item *
-=over
+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>.
=item *
-Perl no longer accidentally clones lexicals in scope within active stack
-frames in the parent when creating a child thread [perl #73086].
+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>.
=item *
-Several memory leaks in cloning and freeing threaded Perl interpreters have been
-fixed [perl #77352].
+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()>.
=item *
-Creating a new thread when directory handles were open used to cause a
-crash, because the handles were not cloned, but simply passed to the new
-thread, resulting in a double free.
+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
-Now directory handles are cloned properly on Windows
-and on systems that have a C<fchdir> function. On other
-systems, new threads simply do not inherit directory
-handles from their parent threads [perl #75154].
+=over
-=item *
+=item 1.
-The typeglob C<*,>, which holds the scalar variable C<$,> (output field
-separator), had the wrong reference count in child threads.
+Croak "Modification of a read-only value attempted" if read only
-=item *
+=item 2.
-[perl #78494] When pipes are shared between threads, the C<close> function
-(and any implicit close, such as on thread exit) no longer blocks.
+Return without error if the SV happened to already have this magic
-=item *
+=item 3.
-Perl now does a timely cleanup of SVs that are cloned into a new
-thread but then discovered to be orphaned (that is, their owners
-are I<not> cloned). This eliminates several "scalars leaked"
-warnings when joining threads.
+otherwise croak "Don't know how to handle magic of type \\%o"
=back
-=head2 Scoping and Subroutines
+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.
-=over
+=back
-=item *
+=head1 Selected Bug Fixes
+
+=head2 Regular expressions and character classes
-Lvalue subroutines are again able to return copy-on-write scalars. This
-had been broken since version 5.10.0 [perl #75656] (5.12.3).
+=over 4
=item *
-C<require> no longer causes C<caller> to return the wrong file name for
-the scope that called C<require> and other scopes higher up that had the
-same file name [perl #68712].
+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:
-=item *
+ "\N{KELVIN SIGN}" =~ /k|foo/iaa;
-C<sort> with a C<($$)>-prototyped comparison routine used to cause the value
-of C<@_> to leak out of the sort. Taking a reference to C<@_> within the
-sorting routine could cause a crash [perl #72334].
+succeeded inappropriately. This is now fixed.
=item *
-Match variables (like C<$1>) no longer persist between calls to a sort
-subroutine [perl #76026].
+5.14.0 introduced some memory leaks in regular expression character
+classes such as C<[\w\s]>, which have now been fixed (5.14.1)
=item *
-Iterating with C<foreach> over an array returned by an lvalue sub now works
-[perl #23790].
+An edge case in regular expression matching could potentially loop.
+This happened only under C</i> in bracketed character classes that have
+characters with multi-character folds, and the target string to match
+against includes the first portion of the fold, followed by another
+character that has a multi-character fold that begins with the remaining
+portion of the fold, plus some more.
-=item *
+ "s\N{U+DF}" =~ /[\x{DF}foo]/i
-C<$@> is now localised during calls to C<binmode> to prevent action at a
-distance [perl #78844].
+is one such case. C<\xDF> folds to C<"ss">. (5.14.1)
=item *
-Calling a closure prototype (what is passed to an attribute handler for a
-closure) now results in a "Closure prototype called" error message instead
-of a crash [perl #68560].
+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 *
-Mentioning a read-only lexical variable from the enclosing scope in a
-string C<eval> no longer causes the variable to become writable
-[perl #19135].
+Fixed memory leak regression in regular expression compilation
+under threading
=back
-=head2 Signals
+=head2 Formats
=over
=item *
-Within signal handlers, C<$!> is now implicitly localized.
-
-=item *
-
-CHLD signals are no longer unblocked after a signal handler is called if
-they were blocked before by C<POSIX::sigprocmask> [perl #82040].
+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].
=item *
-A signal handler called within a signal handler could cause leaks or
-double-frees. Now fixed [perl #76248].
+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].
=back
-=head2 Miscellaneous Memory Leaks
+=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 *
-Several memory leaks when loading XS modules were fixed (5.12.2).
+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 *
-L<substr()|perlfunc/"substr EXPR,OFFSET,LENGTH,REPLACEMENT">,
-L<pos()|perlfunc/"index STR,SUBSTR,POSITION">, L<keys()|perlfunc/"keys HASH">,
-and L<vec()|perlfunc/"vec EXPR,OFFSET,BITS"> could, when used in combination
-with lvalues, result in leaking the scalar value they operate on, and cause its
-destruction to happen too late. This has now been fixed.
+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.
=item *
-The postincrement and postdecrement operators, C<++> and C<-->, used to cause
-leaks when used on references. This has now been fixed.
+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 = ()>).
=item *
-Nested C<map> and C<grep> blocks no longer leak memory when processing
-large lists [perl #48004].
+Localising a tied variable used to make it read-only if it contained a
+copy-on-write string.
=item *
-C<use I<VERSION>> and C<no I<VERSION>> no longer leak memory [perl #78436]
-[perl #69050].
+L<Storable>, L<Devel::Peek> and L<PerlIO::scalar> had similar problems.
+See L</Updated Modules and Pragmata>, above.
-=item *
+=back
-C<.=> followed by C<< <> >> or C<readline> would leak memory if C<$/>
-contained characters beyond the octet range and the scalar assigned to
-happened to be encoded as UTF8 internally [perl #72246].
+=head2 lvalue subroutines
-=item *
+There have been various fixes to lvalue subroutines.
-C<eval 'BEGIN{die}'> no longer leaks memory on non-threaded builds.
+=over
-=back
+=item *
-=head2 Memory Corruption and Crashes
+Explicit return now returns the actual argument passed to return, instead
+of copying it [perl #72724] [perl #72706].
-=over
+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 *
-glob() no longer crashes when C<%File::Glob::> is empty and
-C<CORE::GLOBAL::glob> isn't present [perl #75464] (5.12.2).
+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 *
-readline() has been fixed when interrupted by signals so it no longer
-returns the "same thing" as before or random memory.
+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 *
-When assigning a list with duplicated keys to a hash, the assignment used to
-return garbage and/or freed values:
+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.
- @a = %h = (list with some duplicate keys);
+=item *
-This has now been fixed [perl #31865].
+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<($)>
+prototype would cause an lvalue sub to copy its return value [perl #51408],
+and C<while(lvalue_sub() =~ m/.../g) { ... }> would loop endlessly
+[perl #78680].
=item *
-The mechanism for freeing objects in globs used to leave dangling
-pointers to freed SVs, meaning Perl users could see corrupted state
-during destruction.
-
-Perl now frees only the affected slots of the GV, rather than freeing
-the GV itself. This makes sure that there are no dangling refs or
-corrupted state during destruction.
+Autovivification now works on values returned from lvalue subroutines
+[perl #7946].
=item *
-The interpreter no longer crashes when freeing deeply-nested arrays of
-arrays. Hashes have not been fixed yet [perl #44225].
+When called in pass-by-reference context (e.g., subroutine arguments or a list
+passed to C<for>), an lvalue subroutine returning arrays or hashes used to bind
+the arrays (or hashes) to scalar variables--something that is not supposed to
+happen. This could result in "Bizarre copy of ARRAY" errors or C<print>
+ignoring its arguments. It also made nonsensical code like C<@{\$_}> "work".
+This was fixed in 5.14.0 if an array were the first thing returned from the
+subroutine (but not for C<$scalar, @array> or hashes being returned). Now a
+more general fix has been applied [perl #23790].
=item *
-Concatenating long strings under C<use encoding> no longer causes Perl to
-crash [perl #78674].
+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.
=item *
-Calling C<< ->import >> on a class lacking an import method could corrupt
-the stack, resulting in strange behaviour. For instance,
+Assignment to C<keys> returned from an lvalue sub used not to work, but now
+it does.
+
+=item *
- push @a, "foo", $b = bar->import;
+Applying the C<:lvalue> attribute to an XSUB or to an aliased subroutine
+stub with C<< sub foo :lvalue; >> syntax stopped working in Perl 5.12.
+This has been fixed.
-would assign "foo" to C<$b> [perl #63790].
+=back
-=item *
+=head2 Fixes related to hashes
-The C<recv> function could crash when called with the MSG_TRUNC flag
-[perl #75082].
+=over
=item *
-C<formline> no longer crashes when passed a tainted format picture. It also
-taints C<$^A> now if its arguments are tainted [perl #79138].
+A bug has been fixed that would cause a "Use of freed value in iteration"
+error if the next two hash elements that would be iterated over are
+deleted [perl #85026]. (5.14.1)
=item *
-A bug in how we process filetest operations could cause a segfault.
-Filetests don't always expect an op on the stack, so we now use
-TOPs only if we're sure that we're not C<stat>ing the C<_> filehandle.
-This is indicated by C<OPf_KIDS> (as checked in ck_ftst) [perl #74542]
-(5.12.1).
+Freeing deeply nested hashes no longer crashes [perl #44225].
=item *
-unpack() now handles scalar context correctly for C<%32H> and C<%32u>,
-fixing a potential crash. split() would crash because the third item
-on the stack wasn't the regular expression it expected. C<unpack("%2H",
-...)> would return both the unpacked result and the checksum on the stack,
-as would C<unpack("%2u", ...)> [perl #73814] (5.12.2).
+Deleting the current hash iterator (the hash element that would be returend
+by the next call to C<each>) in void context used not to free it. The hash
+would continue to reference it until the next iteration. This has been
+fixed [perl #85026].
=back
-=head2 Fixes to Various Perl Operators
+=head2 Other notable fixes
=over
=item *
-The C<&>, C<|>, and C<^> bitwise operators no longer coerce read-only arguments
-[perl #20661].
+Passing the same constant subroutine to both C<index> and C<formline> no
+longer causes one or the other to fail [perl #89218]. (5.14.1)
=item *
-Stringifying a scalar containing "-0.0" no longer has the effect of turning
-false into true [perl #45133].
+List assignment to lexical variables declared with attributes in the same
+statement (C<my ($x,@y) : blimp = (72,94)>) stopped working in Perl 5.8.0.
+It has now been fixed.
=item *
-Some numeric operators were converting integers to floating point,
-resulting in loss of precision on 64-bit platforms [perl #77456].
+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 *
-sprintf() was ignoring locales when called with constant arguments
-[perl #78632].
+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 }>).
-=item *
-
-Combining the vector (C<%v>) flag and dynamic precision would
-cause C<sprintf> to confuse the order of its arguments, making it
-treat the string as the precision and vice-versa [perl #83194].
-
-=back
+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].
-=head2 Bugs Relating to the C API
-
-=over
+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 *
-The C-level C<lex_stuff_pvn> function would sometimes cause a spurious
-syntax error on the last line of the file if it lacked a final semicolon
-[perl #74006] (5.12.1).
+C<given> was not calling set-magic on the implicit lexical C<$_> that it
+uses. This meant, for example, that C<pos> would be remembered from one
+execution of the same C<given> block to the next, even if the input were a
+different variable [perl #84526].
=item *
-The C<eval_sv> and C<eval_pv> C functions now set C<$@> correctly when
-there is a syntax error and no C<G_KEEPERR> flag, and never set it if the
-C<G_KEEPERR> flag is present [perl #3719].
+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 *
-The XS multicall API no longer causes subroutines to lose reference counts
-if called via the multicall interface from within those very subroutines.
-This affects modules like L<List::Util>. Calling one of its functions with an
-active subroutine as the first argument could cause a crash [perl #78070].
+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<SvPVbyte> function available to XS modules now calls magic before
-downgrading the SV, to avoid warnings about wide characters [perl #72398].
+The C<study> function could become confused if fed a string longer than
+2**31 characters. Now it simply skips such strings.
=item *
-The ref types in the typemap for XS bindings now support magical variables
-[perl #72684].
+C<each(I<ARRAY>)> is now wrapped in C<defined(...)>, like C<each(I<HASH>)>,
+inside a C<while> condition [perl #90888].
=item *
-C<sv_catsv_flags> no longer calls C<mg_get> on its second argument (the
-source string) if the flags passed to it do not include SV_GMAGIC. So it
-now matches the documentation.
+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].
=item *
-C<my_strftime> no longer leaks memory. This fixes a memory leak in
-C<POSIX::strftime> [perl #73520].
+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 *
-F<XSUB.h> now correctly redefines fgets under PERL_IMPLICIT_SYS [perl #55049]
-(5.12.1).
+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().
=item *
-XS code using fputc() or fputs() on Windows could cause an error
-due to their arguments being swapped [perl #72704] (5.12.1).
+Some cases of threads crashing due to memory allocation during cloning have
+been fixed [perl #90006].
=item *
-A possible segfault in the C<T_PRTOBJ> default typemap has been fixed
-(5.12.2).
+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].
=item *
-A bug that could cause "Unknown error" messages when
-C<call_sv(code, G_EVAL)> is called from an XS destructor has been fixed
-(5.12.2).
+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<$x>. This has been fixed [perl #91844].
=back
=head1 Known Problems
-This is a list of significant unresolved issues which are regressions
-from earlier versions of Perl or which affect widely-used CPAN modules.
-
=over 4
=item *
-C<List::Util::first> misbehaves in the presence of a lexical C<$_>
-(typically introduced by C<my $_> or implicitly by C<given>). The variable
-that gets set for each iteration is the package variable C<$_>, not the
-lexical C<$_>.
-
-A similar issue may occur in other modules that provide functions which
-take a block as their first argument, like
-
- foo { ... $_ ...} list
-
-See also: L<http://rt.perl.org/rt3/Public/Bug/Display.html?id=67694>
-
-=item *
-
-readline() returns an empty string instead of undef when it is
-interrupted by a signal.
-
-=item *
-
-L<version> now prevents object methods from being called as class methods
-(d808b68)
+The fix for perl #36347 causes test failures for C<Gtk2> and C<Tk> on some
+systems [perl #82542].
=item *
-The changes in prototype handling break L<Switch>. A patch has been sent
-upstream and will hopefully appear on CPAN soon.
+The changes to C<tie> cause test failures for the C<JS> module.
=item *
-The upgrade to F<ExtUtils-MakeMaker-6.57_05> has caused
-some tests in the F<Module-Install> distribution on CPAN to
-fail. (Specifically, F<02_mymeta.t> tests 5 and 21l; F<18_all_from.t>
-tests 6 and 15; F<19_authors.t> tests 5, 13, 21, and 29; and
-F<20_authors_with_special_characters.t> tests 6, 15, and 23 in version
-1.00 of that distribution now fail.)
+The changes to C<$$> cause test failures for the C<Event> module.
=back
-=head1 Errata
-
-=head2 keys(), values(), and each() work on arrays
-
-You can now use the keys(), values(), and each() builtins on arrays;
-previously you could use them only on hashes. See L<perlfunc> for details.
-This is actually a change introduced in perl 5.12.0, but it was missed from
-that release's L<perl5120delta>.
-
-=head2 split() and C<@_>
-
-split() no longer modifies C<@_> when called in scalar or void context.
-In void context it now produces a "Useless use of split" warning.
-This was also a perl 5.12.0 changed that missed the perldelta.
-
-=head1 Obituary
-
-Randy Kobes, creator of http://kobesearch.cpan.org/ and
-contributor/maintainer to several core Perl toolchain modules, passed
-away on September 18, 2010 after a battle with lung cancer. The community
-was richer for his involvement. He will be missed.
=head1 Acknowledgements
-
-Perl 5.14.0 represents one year of development since
-Perl 5.12.0 and contains nearly 550,000 lines of changes across nearly
-3,000 files from 150 authors and committers.
+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 5.14.0:
-
-Aaron Crane, Abhijit Menon-Sen, Abigail, Ævar Arnfjörð Bjarmason,
-Alastair Douglas, Alexander Alekseev, Alexander Hartmaier, Alexandr
-Ciornii, Alex Davies, Alex Vandiver, Ali Polatel, Allen Smith, Andreas
-König, Andrew Rodland, Andy Armstrong, Andy Dougherty, Aristotle
-Pagaltzis, Arkturuz, Arvan, A. Sinan Unur, Ben Morrow, Bo Lindbergh,
-Boris Ratner, Brad Gilbert, Bram, brian d foy, Brian Phillips, Casey
-West, Charles Bailey, Chas. Owens, Chip Salzenberg, Chris 'BinGOs'
-Williams, chromatic, Craig A. Berry, Curtis Jewell, Dagfinn Ilmari
-Mannsåker, Dan Dascalescu, Dave Rolsky, David Caldwell, David Cantrell,
-David Golden, David Leadbeater, David Mitchell, David Wheeler, Eric
-Brine, Father Chrysostomos, Fingle Nark, Florian Ragwitz, Frank Wiegand,
-Franz Fasching, Gene Sullivan, George Greer, Gerard Goossen, Gisle Aas,
-Goro Fuji, Grant McLean, gregor herrmann, H.Merijn Brand, Hongwen Qiu,
-Hugo van der Sanden, Ian Goodacre, James E Keenan, James Mastros, Jan
-Dubois, Jay Hannah, Jerry D. Hedden, Jesse Vincent, Jim Cromie, Jirka
-Hruška, John Peacock, Joshua ben Jore, Joshua Pritikin, Karl Williamson,
-Kevin Ryde, kmx, Lars Dɪᴇᴄᴋᴏᴡ 迪拉斯, Larwan Berke, Leon Brocard, Leon
-Timmermans, Lubomir Rintel, Lukas Mai, Maik Hentsche, Marty Pauley,
-Marvin Humphrey, Matt Johnson, Matt S Trout, Max Maischein, Michael
-Breen, Michael Fig, Michael G Schwern, Michael Parker, Michael Stevens,
-Michael Witten, Mike Kelly, Moritz Lenz, Nicholas Clark, Nick Cleaton,
-Nick Johnston, Nicolas Kaiser, Niko Tyni, Noirin Shirley, Nuno Carvalho,
-Paul Evans, Paul Green, Paul Johnson, Paul Marquess, Peter J. Holzer,
-Peter John Acklam, Peter Martini, Philippe Bruhat (BooK), Piotr Fusik,
-Rafael Garcia-Suarez, Rainer Tammer, Reini Urban, Renee Baecker, Ricardo
-Signes, Richard Möhn, Richard Soderberg, Rob Hoelz, Robin Barker, Ruslan
-Zakirov, Salvador Fandiño, Salvador Ortiz Garcia, Shlomi Fish, Sinan
-Unur, Sisyphus, Slaven Rezic, Steffen Müller, Steve Hay, Steven
-Schubiger, Steve Peters, Sullivan Beck, Tatsuhiko Miyagawa, Tim Bunce,
-Todd Rinaldo, Tom Christiansen, Tom Hukins, Tony Cook, Tye McQueen,
-Vadim Konovalov, Vernon Lyon, Vincent Pit, Walt Mankowski, Wolfram
-Humann, Yves Orton, Zefram, and Zsbán Ambrus.
-
-This is woefully incomplete as it's automatically generated from version
-control history. In particular, it doesn't include the names of the
-(very much appreciated) contributors who reported issues in previous
-versions of Perl that helped make Perl 5.14.0 better. For a more complete
-list of all of Perl's historical contributors, please see the C<AUTHORS>
-file in the Perl 5.14.0 distribution.
+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.
=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
+recently posted to the comp.lang.perl.misc newsgroup and the perl
bug database at http://rt.perl.org/perlbug/ . There may also be
information at http://www.perl.org/ , the Perl Home Page.
If the bug you are reporting has security implications, which make it
inappropriate to send to a publicly archived mailing list, then please send
-it to perl5-security-report@perl.org. This points to a closed subscription
-unarchived mailing list, which includes all the core committers, who be able
+it to perl5-security-report@perl.org. This points to a closed subscription
+unarchived mailing list, which includes
+all the core committers, who will be able
to help assess the impact of issues, figure out a resolution, and help
co-ordinate the release of patches to mitigate or fix the problem across all
-platforms on which Perl is supported. Please use this address for
-security issues in the Perl core I<only>, not for modules independently
+platforms on which Perl is supported. Please only use this address for
+security issues in the Perl core, not for modules independently
distributed on CPAN.
=head1 SEE ALSO
https://perl5.git.perl.org / perl5.git / blobdiff