perl5120delta - what is new for perl v5.12.0
-=head1 XXX - THIS DOCUMENT IS ONLY CURRENT THROUGH PERL5114
-
-FIX ME BEFORE RELEASE
-
-OTHER ISSUES:
-
-UPDATED MODULE LIST NEEDS TO BE GENERATED
-ORDERING NEEDS CHECKING
-HEAVY COPYEDITING IS NEEDED
-
-
=head1 DESCRIPTION
This document describes differences between the 5.10.0 release and
the 5.12.0 release.
-Many of the bug fixes in 5.12.0 were already seen in the 5.10.1
-maintenance release since the two releases were kept closely
-coordinated (while 5.12.0 was still called 5.11.something).
-
-You can see the list of changes in the 5.10.1 release
-by reading L<perl5101delta>.
-
-=head1 Core Enhancements
-
-=head2 qr overloading
-
-It is now possible to overload the C<qr//> operator, that is,
-conversion to regexp, like it was already possible to overload
-conversion to boolean, string or number of objects. It is invoked when
-an object appears on the right hand side of the C<=~> operator or when
-it is interpolated into a regexp. See L<overload>.
-
-=head2 Pluggable keywords
-
-Extension modules can now cleanly hook into the Perl parser to define
-new kinds of keyword-headed expression and compound statement. The
-syntax following the keyword is defined entirely by the extension. This
-allow a completely non-Perl sublanguage to be parsed inline, with the
-correct ops cleanly generated. This feature is currently considered
-experimental.
-
-See L<perlapi/PL_keyword_plugin> for the mechanism. The Perl core
-source distribution also includes a new module
-L<XS::APItest::KeywordRPN>, which implements reverse Polish notation
-arithmetic via pluggable keywords. This module is mainly used for test
-purposes, and is not normally installed, but also serves as an example
-of how to use the new mechanism.
-
-=head2 APIs for more internals
-
-The lowest layers of the lexer and parts of the pad system now have C
-APIs available to XS extensions. These are necessary to support proper
-use of pluggable keywords, but have other uses too. The new APIs are
-experimental, and only cover a small proportion of what would be
-necessary to take full advantage of the core's facilities in these
-areas. It is intended that the Perl 5.13 development cycle will see the
-addition of a full range of clean, supported interfaces.
-
-=head2 Overridable function lookup
-
-Where an extension module hooks the creation of rv2cv ops to modify the
-subroutine lookup process, this now works correctly for bareword
-subroutine calls. This means that prototypes on subroutines referenced
-this way will be processed correctly. (Previously bareword subroutine
-names were initially looked up, for parsing purposes, by an unhookable
-mechanism, so extensions could only properly influence subroutine names
-that appeared with an C<&> sigil.)
+Many of the bug fixes in 5.12.0 are already included in the 5.10.1
+maintenance release.
-=head2 Unicode version
+You can see the list of those changes in the 5.10.1 release notes (L<perl5101delta>).
-Perl is shipped with the latest Unicode version, 5.2, dated October 2009. See
-L<http://www.unicode.org/versions/Unicode5.2.0> for details about this release
-of Unicode. See L<perlunicode> for instructions on installing and using
-older versions of Unicode.
-=head2 Unicode properties
+=head1 Core Enhancements
-A concerted effort has been made to update Perl to be in sync with the latest
-Unicode standard. Changes for this include:
+=head2 New C<package NAME VERSION> syntax
-Perl can now handle every Unicode character property. A new pod,
-L<perluniprops>, lists all available non-Unihan character properties. By
-default the Unihan properties and certain others (deprecated and Unicode
-internal-only ones) are not exposed. See below for more details on
-these; there is also a section in the pod listing them, and explaining
-why they are not exposed.
+This new syntax allows a module author to set the $VERSION of a namespace
+when the namespace is declared with 'package'. It eliminates the need
+for C<our $VERSION = ...> and similar constructs. E.g.
-Perl now fully supports the Unicode compound-style of using C<=> and C<:>
-in writing regular expressions: C<\p{property=value}> and
-C<\p{property:value}> (both of which mean the same thing).
+ package Foo::Bar 1.23;
+ # $Foo::Bar::VERSION == 1.23
-Perl now fully supports the Unicode loose matching rules for text
-between the braces in C<\p{...}> constructs. In addition, Perl allows
-underscores between digits of numbers.
+There are several advantages to this:
-All the Unicode-defined synonyms for properties and property values are
-now accepted.
+=over
-C<qr/\X/>, which matches a Unicode logical character, has been expanded to work
-better with various Asian languages. It now is defined as an I<extended
-grapheme cluster>. (See L<http://www.unicode.org/reports/tr29/>).
-Anything matched previously and that made sense will continue to be
-matched, but in addition:
+=item *
-=over
+C<$VERSION> is parsed in exactly the same way as C<use NAME VERSION>
=item *
-C<\X> will not break apart a C<S<CR LF>> sequence.
+C<$VERSION> is set at compile time
=item *
-C<\X> will now match a sequence which includes the C<ZWJ> and C<ZWNJ> characters.
+C<$VERSION> is a version object that provides proper overloading of
+comparison operators so comparing C<$VERSION> to decimal (1.23) or
+dotted-decimal (v1.2.3) version numbers works correctly.
=item *
-C<\X> will now always match at least one character, including an initial mark.
-Marks generally come after a base character, but it is possible in Unicode to
-have them in isolation, and C<\X> will now handle that case, for example at the
-beginning of a line, or after a C<ZWSP>. And this is the part where C<\X>
-doesn't match the things that it used to that don't make sense. Formerly, for
-example, you could have the nonsensical case of an accented LF.
+Eliminates C<$VERSION = ...> and C<eval $VERSION> clutter
=item *
-C<\X> will now match a (Korean) Hangul syllable sequence, and the Thai and Lao
-exception cases.
+As it requires VERSION to be a numeric literal or v-string
+literal, it can be statically parsed by toolchain modules
+without C<eval> the way MM-E<gt>parse_version does for C<$VERSION = ...>
=back
-Otherwise, this change should be transparent for the non-affected languages.
+It does not break old code with only C<package NAME>, but code that uses
+C<package NAME VERSION> will need to be restricted to perl 5.12.0 or newer
+This is analogous to the change to C<open> from two-args to three-args.
+Users requiring the latest Perl will benefit, and perhaps after several
+years, it will become a standard practice.
-C<\p{...}> matches using the Canonical_Combining_Class property were
-completely broken in previous Perls. This is now fixed.
-
-In previous Perls, the Unicode C<Decomposition_Type=Compat> property and a
-Perl extension had the same name, which led to neither matching all the
-correct values (with more than 100 mistakes in one, and several thousand
-in the other). The Perl extension has now been renamed to be
-C<Decomposition_Type=Noncanonical> (short: C<dt=noncanon>). It has the same
-meaning as was previously intended, namely the union of all the
-non-canonical Decomposition types, with Unicode C<Compat> being just one of
-those.
-
-C<\p{Uppercase}> and C<\p{Lowercase}> have been brought into line with the
-Unicode definitions. This means they each match a few more characters
-than previously.
-
-C<\p{Cntrl}> now matches the same characters as C<\p{Control}>. This means it
-no longer will match Private Use (gc=co), Surrogates (gc=cs), nor Format
-(gc=cf) code points. The Format code points represent the biggest
-possible problem. All but 36 of them are either officially deprecated
-or strongly discouraged from being used. Of those 36, likely the most
-widely used are the soft hyphen (U+00AD), and BOM, ZWSP, ZWNJ, WJ, and
-similar characters, plus bidirectional controls.
-
-C<\p{Alpha}> now matches the same characters as C<\p{Alphabetic}>. The Perl
-definition included a number of things that aren't really alpha (all
-marks), while omitting many that were. As a direct consequence, the
-definitions of C<\p{Alnum}> and C<\p{Word}> which depend on Alpha also change
-correspondingly.
-
-C<\p{Word}> also now doesn't match certain characters it wasn't supposed
-to, such as fractions.
-
-C<\p{Print}> no longer matches the line control characters: Tab, LF, CR,
-FF, VT, and NEL. This brings it in line with standards and the documentation.
-C<\p{Decomposition_Type=Canonical}> now includes the Hangul syllables.
+However, C<package NAME VERSION> requires a new, 'strict' version
+number format. See L<"Version number formats"> for details.
-C<\p{XDigit}> now matches the same characters as C<\p{Hex_Digit}>. This
-means that in addition to the characters it currently matches,
-C<[A-Fa-f0-9]>, it will also match the 22 fullwidth equivalents, for
-example U+FF10: FULLWIDTH DIGIT ZERO.
-The Numeric type property has been extended to include the Unihan
-characters.
+=head2 The C<...> operator
-There is a new Perl extension, the 'Present_In', or simply 'In',
-property. This is an extension of the Unicode Age property, but
-C<\p{In=5.0}> matches any code point whose usage has been determined
-I<as of> Unicode version 5.0. The C<\p{Age=5.0}> only matches code points
-added in I<precisely> version 5.0.
+A new operator, C<...>, nicknamed the Yada Yada operator, has been added.
+It is intended to mark placeholder code that is not yet implemented.
+See L<perlop/"Yada Yada Operator">.
-A number of properties did not have the correct values for unassigned
-code points. This is now fixed. The affected properties are
-Bidi_Class, East_Asian_Width, Joining_Type, Decomposition_Type,
-Hangul_Syllable_Type, Numeric_Type, and Line_Break.
+=head2 Implicit strictures
-The Default_Ignorable_Code_Point, ID_Continue, and ID_Start properties
-have been updated to their current Unicode definitions.
+Using the C<use VERSION> syntax with a version number greater or equal
+to 5.11.0 will lexically enable strictures just like C<use strict>
+would do (in addition to enabling features.) The following:
-Certain properties that are supposed to be Unicode internal-only were
-erroneously exposed by previous Perls. Use of these in regular
-expressions will now generate, if enabled, a deprecated warning message.
-The properties are: Other_Alphabetic, Other_Default_Ignorable_Code_Point,
-Other_Grapheme_Extend, Other_ID_Continue, Other_ID_Start, Other_Lowercase,
-Other_Math, and Other_Uppercase.
+ use 5.12.0;
-An installation can now fairly easily change which Unicode properties
-Perl understands. As mentioned above, certain properties are by default
-turned off. These include all the Unihan properties (which should be
-accessible via the CPAN module Unicode::Unihan) and any deprecated or
-Unicode internal-only property that Perl has never exposed.
+means:
-The generated files in the C<lib/unicore/To> directory are now more
-clearly marked as being stable, directly usable by applications.
-New hash entries in them give the format of the normal entries,
-which allows for easier machine parsing. Perl can generate files
-in this directory for any property, though most are suppressed. An
-installation can choose to change which get written. Instructions
-are in L<perluniprops>.
+ use strict;
+ use feature ':5.12';
-=head2 Regular Expressions
+=head2 Unicode improvements
-U+0FFFF is now a legal character in regular expressions.
+Perl 5.12 comes with Unicode 5.2, the latest version available to
+us at the time of release. This version of Unicode was released in
+October 2009. See L<http://www.unicode.org/versions/Unicode5.2.0> for
+further details about what's changed in this version of the standard.
+See L<perlunicode> for instructions on installing and using other versions
+of Unicode.
-=head2 A proper interface for pluggable Method Resolution Orders
+Additionally, Perl's developers have significantly improved Perl's Unicode
+implementation. For full details, see L</Unicode overhaul> below.
-As of Perl 5.11.0 there is a new interface for plugging and using method
-resolution orders other than the default (linear depth first search).
-The C3 method resolution order added in 5.10.0 has been re-implemented as
-a plugin, without changing its Perl-space interface. See L<perlmroapi> for
-more information.
+=head2 Y2038 compliance
-=head2 The C<overloading> pragma
+Perl's core time-related functions are now Y2038 compliant. (It may not mean much to you, but your kids will love it!)
-This pragma allows you to lexically disable or enable overloading
-for some or all operations. (Yuval Kogman)
+=head2 qr overloading
-=head2 C<\N> experimental regex escape
+It is now possible to overload the C<qr//> operator, that is,
+conversion to regexp, like it was already possible to overload
+conversion to boolean, string or number of objects. It is invoked when
+an object appears on the right hand side of the C<=~> operator or when
+it is interpolated into a regexp. See L<overload>.
-A new regex escape has been added, C<\N>. It will match any character that
-is not a newline, independently from the presence or absence of the single
-line match modifier C</s>. It is not usable within a character class.
-C<\N{3}> means to match 3 non-newlines; C<\N{5,}> means to match at least 5.
-C<\N{NAME}> still means the character or sequence named C<NAME>, but C<NAME> no
-longer can be things like C<3>, or C<5,>.
-Compatibility with Unicode names is preserved, as none look like these, but it
-has been possible to create custom names that do look like them, and those will
-no longer work. (Rafael Garcia-Suarez)
+=head2 Pluggable keywords
-This will break a L<custom charnames translator|charnames/CUSTOM TRANSLATORS>
-which allows numbers for character names, as C<\N{3}> will now mean to match 3
-non-newline characters, and not the character whose name is C<3>. (No standard
-name is a number, so only a custom translator would be affected.)
+Extension modules can now cleanly hook into the Perl parser to define
+new kinds of keyword-headed expression and compound statement. The
+syntax following the keyword is defined entirely by the extension. This
+allow a completely non-Perl sublanguage to be parsed inline, with the
+correct ops cleanly generated.
-This escape is experimental, subject to change, because there is some concern
-about possible confusion with the previous meaning of C<\N{...}>
+See L<perlapi/PL_keyword_plugin> for the mechanism. The Perl core
+source distribution also includes a new module
+L<XS::APItest::KeywordRPN>, which implements reverse Polish notation
+arithmetic via pluggable keywords. This module is mainly used for test
+purposes, and is not normally installed, but also serves as an example
+of how to use the new mechanism.
-=head2 Implicit strictures
+Perl's developers consider this feature to be experimental. We may remove
+it or change it in a backwards-incompatible way in Perl 5.14.
-Using the C<use VERSION> syntax with a version number greater or equal
-to 5.11.0 will also lexically enable strictures just like C<use strict>
-would do (in addition to enabling features.) So, the following:
+=head2 APIs for more internals
- use 5.11.0;
+The lowest layers of the lexer and parts of the pad system now have C
+APIs available to XS extensions. These are necessary to support proper
+use of pluggable keywords, but have other uses too. The new APIs are
+experimental, and only cover a small proportion of what would be
+necessary to take full advantage of the core's facilities in these
+areas. It is intended that the Perl 5.13 development cycle will see the
+addition of a full range of clean, supported interfaces.
-will now imply:
+Perl's developers consider this feature to be experimental. We may remove
+it or change it in a backwards-incompatible way in Perl 5.14.
- use strict;
- use feature ':5.11';
+=head2 Overridable function lookup
-=head2 Parallel tests
+Where an extension module hooks the creation of rv2cv ops to modify the
+subroutine lookup process, this now works correctly for bareword
+subroutine calls. This means that prototypes on subroutines referenced
+this way will be processed correctly. (Previously bareword subroutine
+names were initially looked up, for parsing purposes, by an unhookable
+mechanism, so extensions could only properly influence subroutine names
+that appeared with an C<&> sigil.)
-The core distribution can now run its regression tests in parallel on
-Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in
-your environment to the number of tests to run in parallel, and run
-C<make test_harness>. On a Bourne-like shell, this can be done as
+=head2 A proper interface for pluggable Method Resolution Orders
- TEST_JOBS=3 make test_harness # Run 3 tests in parallel
+As of Perl 5.12.0 there is a new interface for plugging and using method
+resolution orders other than the default linear depth first search.
+The C3 method resolution order added in 5.10.0 has been re-implemented as
+a plugin, without changing its Perl-space interface. See L<perlmroapi> for
+more information.
-An environment variable is used, rather than parallel make itself, because
-L<TAP::Harness> needs to be able to schedule individual non-conflicting test
-scripts itself, and there is no standard interface to C<make> utilities to
-interact with their job schedulers.
-Note that currently some test scripts may fail when run in parallel (most
-notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts
-again sequentially and see if the failures go away.
-=head2 The C<...> operator
+=head2 C<\N> experimental regex escape
-A new operator, C<...>, nicknamed the Yada Yada operator, has been added.
-It is intended to mark placeholder code that is not yet implemented.
-See L<perlop/"Yada Yada Operator">. (chromatic)
+Perl now supports C<\N>, a new regex escape which you can think of as
+the inverse of C<\n>. It will match any character that is not a newline,
+independently from the presence or absence of the single line match
+modifier C</s>. It is not usable within a character class. C<\N{3}>
+means to match 3 non-newlines; C<\N{5,}> means to match at least 5.
+C<\N{NAME}> still means the character or sequence named C<NAME>, but
+C<NAME> no longer can be things like C<3>, or C<5,>.
+
+This will break a L<custom charnames translator|charnames/CUSTOM
+TRANSLATORS> which allows numbers for character names, as C<\N{3}> will
+now mean to match 3 non-newline characters, and not the character whose
+name is C<3>. (No name defined by the Unicode standard is a number,
+so only custom translators might be affected.)
+
+Perl's developers are somewhat concerned about possible user confusion
+with the existing C<\N{...}> construct which matches characters by their
+Unicode name. Consequently, this feature is experimental. We may remove
+it or change it in a backwards-incompatible way in Perl 5.14.
=head2 DTrace support
-Some support for DTrace has been added. See "DTrace support" in F<INSTALL>.
+Perl now has some support for DTrace. See "DTrace support" in F<INSTALL>.
=head2 Support for C<configure_requires> in CPAN module metadata
The C<each> function can now operate on arrays.
-=head2 Y2038 compliance
+=head2 C<when> as a statement modifier
-Perl's core time-related functions are now Y2038 compliant. (With 29
-years to spare!)
+C<when> is now allowed to be used as a statement modifier.
=head2 C<$,> flexibility
The variable C<$,> may now be tied.
-=head2 // in where clauses
+=head2 // in when clauses
// now behaves like || in when clauses
terminated by nul byte, but with the length passed to the socket()
system call.
-=head2 New C<package NAME VERSION> syntax
-
-This new syntax allows a module author to set the $VERSION of a namespace
-when the namespace is declared with 'package'. It eliminates the need
-for C<our $VERSION = ...> and similar constructs. E.g.
-
- package Foo::Bar 1.23;
- # $Foo::Bar::VERSION == 1.23
-
-There are several advantages to this:
-
-=over
-
-=item *
-
-C<$VERSION> is parsed in exactly the same way as C<use NAME VERSION>
-
-=item *
-
-C<$VERSION> is set at compile time
-
-=item *
-
-C<$VERSION> is a version object that provides proper overloading of
-comparision operators so comparing C<$VERSION> to decimal (1.23) or
-dotted-decimal (v1.2.3) version numbers works correctly.
-
-=item *
-
-Eliminates C<$VERSION = ...> and C<eval $VERSION> clutter
+=head2 32-bit limit on substr arguments removed
-=item *
-
-As it requires VERSION to be a numeric literal or v-string
-literal, it can be statically parsed by toolchain modules
-without C<eval> the way MM-E<gt>parse_version does for C<$VERSION = ...>
-
-=item *
+The 32-bit limit on C<substr> arguments has now been removed. The full range
+of the system's signed and unsigned integers is now available for the C<pos>
+and C<len> arguments.
-It does not break old code with only C<package NAME>, but code that uses
-C<package NAME VERSION> will need to be restricted to perl 5.12.0 or newer
-This is analogous to the change to C<open> from two-args to three-args.
-Users requiring the latest Perl will benefit, and perhaps after several
-years, it will become a standard practice.
+=head1 Potentially Incompatible Changes
-=back
+=head2 Deprecations warn by default
-However, C<package NAME VERSION> requires a new, 'strict' version
-number format. See L<"Version number formats"> for details.
+Perl now defaults to issuing a warning if a deprecated language feature
+is used.
-=head1 Incompatible Changes
+To disable this feature in a given lexical scope, you should use C<no
+warnings 'deprecated';> For information about which language features
+are deprecated and explanations of various deprecation warnings, please
+see L<perldiag.pod>. See L</Deprecations> below for the list of features
+and modules Perl's developers have deprecated as part of this release.
=head2 Version number formats
Acceptable version number formats have been formalized into "strict" and
-"lax" rules. C<package NAME VERSION> takes a strict version number.
+"lax" rules. C<package NAME VERSION> takes a strict version number.
C<UNIVERSAL::VERSION> and the L<version> object constructors take lax
-version numbers. Providing an invalid version will result in a fatal
-error. The version argument in C<use NAME VERSION> is first parsed as a
+version numbers. Providing an invalid version will result in a fatal
+error. The version argument in C<use NAME VERSION> is first parsed as a
numeric literal or v-string and then passed to C<UNIVERSAL::VERSION>
(and must then pass the "lax" format test).
-These formats are documented fully in the L<version> module. To a first
+These formats are documented fully in the L<version> module. To a first
approximation, a "strict" version number is a positive decimal number
(integer or decimal-fraction) without exponentiation or else a
dotted-decimal v-string with a leading 'v' character and at least three
-components. A "lax" version number allows v-strings with fewer than
-three components or without a leading 'v'. Under "lax" rules, both
+components. A "lax" version number allows v-strings with fewer than
+three components or without a leading 'v'. Under "lax" rules, both
decimal and dotted-decimal versions may have a trailing "alpha"
component separated by an underscore character after a fractional or
dotted-decimal component.
=head2 @INC reorganization
-In @INC, ARCHLIB and PRIVLIB now occur after after the current version's
-site_perl and vendor_perl.
+In C<@INC>, C<ARCHLIB> and C<PRIVLIB> now occur after after the current
+version's C<site_perl> and C<vendor_perl>. Modules installed into
+C<site_perl> and C<vendor_perl> will now be loaded in preference to
+those installed in C<ARCHLIB> and C<PRIVLIB>.
=head2 Switch statement changes
-The handling of complex expressions by the C<given>/C<when> switch
-statement has been enhanced. These enhancements are also available in
-5.10.1 and subsequent 5.10 releases. There are two new cases where
+The C<given>/C<when> switch statement handles complex statements better
+than Perl 5.10.0 did (These enhancements are also available in
+5.10.1 and subsequent 5.10 releases.) There are two new cases where
C<when> now interprets its argument as a boolean, instead of an
expression to be used in a smart match:
-=head2 flip-flop operators
+=over
+
+=item flip-flop operators
The C<..> and C<...> flip-flop operators are now evaluated in boolean
context, following their usual semantics; see L<perlop/"Range Operators">.
# do something
}
-=head2 defined-or operator
+=item defined-or operator
A compound expression involving the defined-or operator, as in
C<when (expr1 // expr2)>, will be treated as boolean if the first
expression is boolean. (This just extends the existing rule that applies
to the regular or operator, as in C<when (expr1 || expr2)>.)
+=back
+
=head2 Smart match changes
-This section details more changes brought to the semantics to
-the smart match operator, that naturally also modify the behaviour
+Since Perl 5.10.0, Perl's developers have made a number of changes to
+the smart match operator. These, of course, also alter the behaviour
of the switch statements where smart matching is implicitly used.
These changes were also made for the 5.10.1 release, and will remain in
subsequent 5.10 releases.
object overloads the stringification or the numification operators, and
if overload fallback is active, it will be used instead, as usual.)
-=head2 Labels can't be keywords
-
-Labels used as targets for the C<goto>, C<last>, C<next> or C<redo>
-statements cannot be keywords anymore. This restriction will prevent
-potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes:
-for example, a statement like C<goto print> would jump to a label whose
-name would be the return value of C<print()>, (usually 1), instead of a
-label named C<print>. Moreover, the other control flow statements
-would just ignore any keyword passed to them as a label name. Since
-such labels cannot be defined anymore, this kind of error will be
-avoided.
-
-=head2 Other incompatible changes
+=head2 Other potentially incompatible changes
=over 4
=item *
-The definitions of a number of Unicode properties have changed to match those
-of the current Unicode standard. These are listed above under L</Unicode
-properties>. This could break code that is expecting the old definitions.
+The definitions of a number of Unicode properties have changed to match
+those of the current Unicode standard. These are listed above under
+L</Unicode overhaul>. This change may break code that expects the old definitions.
=item *
-The boolkeys op moved to the group of hash ops. This breaks binary
+The boolkeys op has moved to the group of hash ops. This breaks binary
compatibility.
=item *
-Filehandles are blessed directly into C<IO::Handle>, as C<FileHandle> is
-merely a wrapper around C<IO::Handle>.
+Filehandles are now always blessed into C<IO::File>.
The previous behaviour was to bless Filehandles into L<FileHandle>
(an empty proxy class) if it was loaded into memory and otherwise
=item *
-The version control system used for the development of the perl
-interpreter has been switched from Perforce to git. This is mainly an
-internal issue that only affects people actively working on the perl core;
-but it may have minor external visibility, for example in some of details
-of the output of C<perl -V>. See L<perlrepository> for more information.
-
-=item *
-
-The internal structure of the C<ext/> directory in the perl source has
-been reorganised. In general, a module C<Foo::Bar> whose source was
-stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also,
-nearly all dual-life modules have been moved from F<lib/> to F<ext/>. This
-is purely a source tarball change, and should make no difference to the
-compilation or installation of perl, unless you have a very customised build
-process that explicitly relies on this structure, or which hard-codes the
-C<nonxs_ext> F<Configure> parameter. Specifically, this change does not by
-default alter the location of any files in the final installation.
+Perl's developers now use git, rather than Perforce. This should be
+a purely internal change only relevant to people actively working on
+the core. However, you may see minor difference in perl as a consequence
+of the change. For example in some of details of the output of C<perl
+-V>. See L<perlrepository> for more information.
=item *
As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental
C<Test::Harness::Straps> module has been removed.
-See L</"Updated Modules"> for more details.
+See L</"Modules and Pragmata"> for more details.
=item *
C<Module::CoreList> no longer contains the C<%:patchlevel> hash.
-=item *
-
-This one is actually a change introduced in 5.10.0, but it was missed
-from that release's perldelta, so it is mentioned here instead.
-
-A bugfix related to the handling of the C</m> modifier and C<qr> resulted
-in a change of behaviour between 5.8.x and 5.10.0:
-
- # matches in 5.8.x, doesn't match in 5.10.0
- $re = qr/^bar/; "foo\nbar" =~ /$re/m;
=item *
=back
+
=head1 Deprecations
From time to time, Perl's developers find it necessary to deprecate
holding back other features or causing performance problems. Sometimes,
the reasons are more complex. Wherever possible, we try to keep deprecated
functionality available to developers in its previous form for at least
-one major release. So long as a deprecated feature isn't actively
+one major release. So long as a deprecated feature isn't actively
disrupting our ability to maintain and extend Perl, we'll try to leave
it in place as long as possible.
-The following items are now deprecated.
+The following items are now deprecated:
+
+=over
+
+=item suidperl
+
+C<suidperl> is no longer part of Perl. It used to provide a mechanism to
+emulate setuid permission bits on systems that don't support it properly.
-=over 4
-=item Use of C<:=> to mean an empty attribute list is now deprecated.
+=item Use of C<:=> to mean an empty attribute list
An accident of Perl's parser meant that these constructions were all
equivalent:
=item C<< UNIVERSAL->import() >>
-The method C<< UNIVERSAL->import() >> is now deprecated. Attempting to
+The method C<< UNIVERSAL->import() >> is now deprecated. Attempting to
pass import arguments to a C<use UNIVERSAL> statement will result in a
deprecation warning.
-=item Use of "goto" to jump into a construct is deprecated
+
+=item Use of "goto" to jump into a construct
Using C<goto> to jump from an outer scope into an inner scope is now
deprecated. This rare use case was causing problems in the
implementation of scopes.
-=item Custom character names in \N{name} should look like names
+=item Custom character names in \N{name} that don't look like names
-In C<\N{I<name>}>, I<name> can be just about anything. The standard Unicode
+In C<\N{I<name>}>, I<name> can be just about anything. The standard Unicode
names have a very limited domain, but a custom name translator could create
-names that are, for example, made up entirely of punctuation symbols. It is
+names that are, for example, made up entirely of punctuation symbols. It is
now deprecated to make names that don't begin with an alphabetic character, and
aren't alphanumeric or contain other than a very few other characters,
-namely spaces, dashes, parentheses and colons. Because of the added meaning of
+namely spaces, dashes, parentheses and colons. Because of the added meaning of
C<\N> (See L</C<\N> experimental regex escape>), names that look like curly
-brace -enclosed quantifiers won't work. For example, C<\N{3,4}> now means to
+brace -enclosed quantifiers won't work. For example, C<\N{3,4}> now means to
match 3 to 4 non-newlines; before a custom name C<3,4> could have been created.
=item Deprecated Modules
If you ship a packaged version of Perl, either alone or as part of a larger
system, then you should carefully consider the reprecussions of core module
-deprecations. You may want to consider shipping your default build of
+deprecations. You may want to consider shipping your default build of
Perl with packages for some or all deprecated modules which 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.
+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.
=over
=item L<Switch>
-Switch is buggy and should be avoided. See L<perlsyn/"Switch
-statements"> for its replacement.
+Switch is buggy and should be avoided. You may find Perl's new
+C<given>/C<when> feature a suitable replacement. See L<perlsyn/"Switch
+statements"> for more information.
=back
-=item suidperl
-
-C<suidperl> has been removed. It used to provide a mechanism to
-emulate setuid permission bits on systems that don't support it properly.
-
=item Assignment to $[
-=item attrs
+=item Use of the attribute :locked on subroutines
-Remove attrs, which has been deprecated since 1999-10-02.
+=item Use of "locked" with the attributes pragma
-=item Use of the attribute :locked on subroutines.
+=item Use of "unique" with the attributes pragma
-=item Use of "locked" with the attributes pragma.
+=item Perl_pmflag
-=item Use of "unique" with the attributes pragma.
+C<Perl_pmflag> 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. Although listed as part of the API, it was never documented,
+and only ever used in F<toke.c>, and prior to 5.10, F<regcomp.c>. In
+core, it has been replaced by a static function.
-=item Numerous Perl 4-era libraries:
+=item Numerous Perl 4-era libraries
F<termcap.pl>, F<tainted.pl>, F<stat.pl>, F<shellwords.pl>, F<pwd.pl>,
F<open3.pl>, F<open2.pl>, F<newgetopt.pl>, F<look.pl>, F<find.pl>,
F<bigfloat.pl>, F<assert.pl>, F<abbrev.pl>, F<dotsh.pl>, and
F<timelocal.pl> are all now deprecated. Using them will incur a warning.
-=back
-=head1 Modules and Pragmata
+=back
+
+=head1 Unicode overhaul
+
+Perl's developers have made a concerted effort to update Perl to be in
+sync with the latest Unicode standard. Changes for this include:
+
+Perl can now handle every Unicode character property. New documentation,
+L<perluniprops>, lists all available non-Unihan character properties. By
+default, perl does not expose Unihan, deprecated or Unicode-internal
+properties. See below for more details on these; there is also a section
+in the pod listing them, and explaining why they are not exposed.
+
+Perl now fully supports the Unicode compound-style of using C<=> and C<:>
+in writing regular expressions: C<\p{property=value}> and
+C<\p{property:value}> (both of which mean the same thing).
+
+Perl now fully supports the Unicode loose matching rules for text
+between the braces in C<\p{...}> constructs. In addition, Perl allows
+underscores between digits of numbers.
+
+Perl now accepts all the Unicode-defined synonyms for properties and property values.
+
+C<qr/\X/>, which matches a Unicode logical character, has been expanded to work
+better with various Asian languages. It now is defined as an I<extended
+grapheme cluster>. (See L<http://www.unicode.org/reports/tr29/>).
+Anything matched previously and that made sense will continue to be
+accepted. Additionally:
+
+=over
+
+=item *
+
+C<\X> will not break apart a C<S<CR LF>> sequence.
+
+=item *
+
+C<\X> will now match a sequence which includes the C<ZWJ> and C<ZWNJ> characters.
+
+=item *
+
+C<\X> will now always match at least one character, including an initial mark.
+Marks generally come after a base character, but it is possible in Unicode to
+have them in isolation, and C<\X> will now handle that case, for example at the
+beginning of a line, or after a C<ZWSP>. And this is the part where C<\X>
+doesn't match the things that it used to that don't make sense. Formerly, for
+example, you could have the nonsensical case of an accented LF.
+
+=item *
+
+C<\X> will now match a (Korean) Hangul syllable sequence, and the Thai and Lao
+exception cases.
+
+=back
+
+Otherwise, this change should be transparent for the non-affected
+languages.
+
+C<\p{...}> matches using the Canonical_Combining_Class property were
+completely broken in previous releases of Perl. They should now work
+correctly.
+
+Before Perl 5.12, the Unicode C<Decomposition_Type=Compat> property
+and a Perl extension had the same name, which led to neither matching
+all the correct values (with more than 100 mistakes in one, and several
+thousand in the other). The Perl extension has now been renamed to be
+C<Decomposition_Type=Noncanonical> (short: C<dt=noncanon>). It has the
+same meaning as was previously intended, namely the union of all the
+non-canonical Decomposition types, with Unicode C<Compat> being just
+one of those.
+
+C<\p{Decomposition_Type=Canonical}> now includes the Hangul syllables.
+
+C<\p{Uppercase}> and C<\p{Lowercase}> now work as the Unicode standard
+says they should. This means they each match a few more characters than
+they used to.
+
+C<\p{Cntrl}> now matches the same characters as C<\p{Control}>. This
+means it no longer will match Private Use (gc=co), Surrogates (gc=cs),
+nor Format (gc=cf) code points. The Format code points represent the
+biggest possible problem. All but 36 of them are either officially
+deprecated or strongly discouraged from being used. Of those 36, likely
+the most widely used are the soft hyphen (U+00AD), and BOM, ZWSP, ZWNJ,
+WJ, and similar characters, plus bidirectional controls.
+
+C<\p{Alpha}> now matches the same characters as C<\p{Alphabetic}>. Before
+5.12, Perl's definition definition included a number of things that aren't
+really alpha (all marks) while omitting many that were. The definitions
+of C<\p{Alnum}> and C<\p{Word}> depend on Alpha's definition and have
+changed accordingly.
+
+C<\p{Word}> no longer incorrectly matches non-word characters such
+as fractions.
+
+C<\p{Print}> no longer matches the line control characters: Tab, LF,
+CR, FF, VT, and NEL. This brings it in line with standards and the
+documentation.
+
+C<\p{XDigit}> now matches the same characters as C<\p{Hex_Digit}>. This
+means that in addition to the characters it currently matches,
+C<[A-Fa-f0-9]>, it will also match the 22 fullwidth equivalents, for
+example U+FF10: FULLWIDTH DIGIT ZERO.
+
+The Numeric type property has been extended to include the Unihan
+characters.
+
+There is a new Perl extension, the 'Present_In', or simply 'In',
+property. This is an extension of the Unicode Age property, but
+C<\p{In=5.0}> matches any code point whose usage has been determined
+I<as of> Unicode version 5.0. The C<\p{Age=5.0}> only matches code points
+added in I<precisely> version 5.0.
+
+A number of properties now have the correct values for unassigned
+code points. The affected properties are Bidi_Class, East_Asian_Width,
+Joining_Type, Decomposition_Type, Hangul_Syllable_Type, Numeric_Type,
+and Line_Break.
+
+The Default_Ignorable_Code_Point, ID_Continue, and ID_Start properties
+are now up to date with current Unicode definitions.
+
+Earlier versions of Perl erroneously exposed certain properties that
+are supposed to be Unicode internal-only. Use of these in regular
+expressions will now generate, if enabled, a deprecation warning message.
+The properties are: Other_Alphabetic, Other_Default_Ignorable_Code_Point,
+Other_Grapheme_Extend, Other_ID_Continue, Other_ID_Start, Other_Lowercase,
+Other_Math, and Other_Uppercase.
+
+It is now possible to change which Unicode properties Perl understands
+on a per-installation basis. As mentioned above, certain properties
+are turned off by default. These include all the Unihan properties
+(which should be accessible via the CPAN module Unicode::Unihan) and any
+deprecated or Unicode internal-only property that Perl has never exposed.
+
+The generated files in the C<lib/unicore/To> directory are now more
+clearly marked as being stable, directly usable by applications. New hash
+entries in them give the format of the normal entries, which allows for
+easier machine parsing. Perl can generate files in this directory for
+any property, though most are suppressed. You can find instructions
+for changing which are written in L<perluniprops>.
+
+
+
+=head1 Modules and Pragmata
+
+=head2 New Modules and Pragmata
+
+=over 4
+
+=item C<autodie>
+
+C<autodie> is a new lexically-scoped alternative for the C<Fatal> module.
+The bundled version is 2.06_01. Note that in this release, using a string
+eval when C<autodie> is in effect can cause the autodie behaviour to leak
+into the surrounding scope. See L<autodie/"BUGS"> for more details.
+
+Version 2.06_01 has been added to the Perl core.
+
+=item C<Compress::Raw::Bzip2>
+
+Version 2.024 has been added to the Perl core.
+
+=item C<overloading>
+
+C<overloading> allows you to lexically disable or enable overloading
+for some or all operations.
+
+Version 0.001 has been added to the Perl core.
+
+=item C<parent>
+
+C<parent> establishes an ISA relationship with base classes at compile
+time. It provides the key feature of C<base> without further unwanted
+behaviors.
+
+Version 0.223 has been added to the Perl core.
+
+=item C<Parse::CPAN::Meta>
+
+Version 1.40 has been added to the Perl core.
+
+=item C<VMS::DCLsym>
+
+Version 1.03 has been added to the Perl core.
+
+=item C<VMS::Stdio>
+
+Version 2.4 has been added to the Perl core.
+
+=item C<XS::APItest::KeywordRPN>
+
+Version 0.003 has been added to the Perl core.
+
+=back
+
+=head2 Updated Pragmata
+
+=over 4
+
+=item C<base>
+
+Upgraded from version 2.13 to 2.15.
+
+=item C<bignum>
+
+Upgraded from version 0.22 to 0.23.
+
+=item C<charnames>
+
+C<charnames> now contains the Unicode F<NameAliases.txt> database file.
+This has the effect of adding some extra C<\N> character names that
+formerly wouldn't have been recognised; for example, C<"\N{LATIN CAPITAL
+LETTER GHA}">.
+
+Upgraded from version 1.06 to 1.07.
+
+=item C<constant>
+
+Upgraded from version 1.13 to 1.20.
+
+=item C<diagnostics>
+
+C<diagnostics> now supports %.0f formatting internally.
+
+C<diagnostics> no longer suppresses C<Use of uninitialized value in range
+(or flip)> warnings. [perl #71204]
+
+Upgraded from version 1.17 to 1.19.
+
+=item C<feature>
+
+In C<feature>, the meaning of the C<:5.10> and C<:5.10.X> feature bundles has
+changed slightly. The last component, if any (i.e. C<X>) is simply ignored.
+This is predicated on the assumption that new features will not, in
+general, be added to maintenance releases. So C<:5.10> and C<:5.10.X>
+have identical effect. This is a change to the behaviour documented for
+5.10.0.
+
+C<feature> now includes the C<unicode_strings> feature:
+
+ use feature "unicode_strings";
+
+This pragma turns on Unicode semantics for the case-changing operations
+(C<uc>, C<lc>, C<ucfirst>, C<lcfirst>) on strings that don't have the
+internal UTF-8 flag set, but that contain single-byte characters between
+128 and 255.
+
+Upgraded from version 1.11 to 1.16.
+
+=item C<less>
+
+C<less> now includes the C<stash_name> method to allow subclasses of
+C<less> to pick where in %^H to store their stash.
+
+Upgraded from version 0.02 to 0.03.
+
+=item C<lib>
+
+Upgraded from version 0.5565 to 0.62.
+
+=item C<mro>
+
+C<mro> is now implemented as an XS extension. The documented interface has not
+changed. Code relying on the implementation detail that some C<mro::>
+methods happened to be available at all times gets to "keep both pieces".
+
+Upgraded from version 1.00 to 1.02.
+
+=item C<overload>
+
+C<overload> now allow overloading of 'qr'.
+
+Upgraded from version 1.06 to 1.10.
+
+=item C<threads>
+
+Upgraded from version 1.67 to 1.75.
+
+=item C<threads::shared>
+
+Upgraded from version 1.14 to 1.32.
+
+=item C<version>
+
+C<version> now has support for L</Version number formats> as described earlier
+in this document and in its own documentation.
+
+Upgraded from version 0.74 to 0.82.
+
+=item C<warnings>
+
+C<warnings> has a new C<warnings::fatal_enabled()> function. It also
+includes a new C<illegalproto> warning category. See also L</New or
+Changed Diagnostics> for this change.
+
+Upgraded from version 1.06 to 1.09.
+
+=back
+
+=head2 Updated Modules
+
+=over 4
+
+=item C<Archive::Extract>
+
+Upgraded from version 0.24 to 0.38.
+
+=item C<Archive::Tar>
+
+Upgraded from version 1.38 to 1.54.
+
+=item C<Attribute::Handlers>
+
+Upgraded from version 0.79 to 0.87.
+
+=item C<AutoLoader>
+
+Upgraded from version 5.63 to 5.70.
+
+=item C<B::Concise>
+
+Upgraded from version 0.74 to 0.78.
+
+=item C<B::Debug>
+
+Upgraded from version 1.05 to 1.12.
+
+=item C<B::Deparse>
+
+Upgraded from version 0.83 to 0.94.
+
+=item C<B::Lint>
+
+Upgraded from version 1.09 to 1.11_01.
+
+=item C<CGI>
+
+Upgraded from version 3.29 to 3.48.
+
+=item C<Class::ISA>
+
+Upgraded from version 0.33 to 0.36.
+
+NOTE: C<Class::ISA> is deprecated and may be removed from a future version of Perl.
+
+=item C<Compress::Raw::Zlib>
+
+Upgraded from version 2.008 to 2.024.
+
+=item C<CPAN>
+
+Upgraded from version 1.9205 to 1.94_56.
+
+=item C<CPANPLUS>
+
+Upgraded from version 0.84 to 0.90.
+
+=item C<CPANPLUS::Dist::Build>
+
+Upgraded from version 0.06_02 to 0.46.
+
+=item C<Data::Dumper>
+
+Upgraded from version 2.121_14 to 2.125.
+
+=item C<DB_File>
+
+Upgraded from version 1.816_1 to 1.820.
+
+=item C<Devel::PPPort>
+
+Upgraded from version 3.13 to 3.19.
+
+=item C<Digest>
+
+Upgraded from version 1.15 to 1.16.
+
+=item C<Digest::MD5>
+
+Upgraded from version 2.36_01 to 2.39.
+
+=item C<Digest::SHA>
+
+Upgraded from version 5.45 to 5.47.
+
+=item C<Encode>
+
+Upgraded from version 2.23 to 2.39.
+
+=item C<Exporter>
+
+Upgraded from version 5.62 to 5.64_01.
+
+=item C<ExtUtils::CBuilder>
+
+Upgraded from version 0.21 to 0.27.
+
+=item C<ExtUtils::Command>
+
+Upgraded from version 1.13 to 1.16.
+
+=item C<ExtUtils::Constant>
+
+Upgraded from version 0.2 to 0.22.
+
+=item C<ExtUtils::Install>
+
+Upgraded from version 1.44 to 1.55.
+
+=item C<ExtUtils::MakeMaker>
+
+Upgraded from version 6.42 to 6.56.
+
+=item C<ExtUtils::Manifest>
+
+Upgraded from version 1.51_01 to 1.57.
+
+=item C<ExtUtils::ParseXS>
+
+Upgraded from version 2.18_02 to 2.21.
+
+=item C<File::Fetch>
+
+Upgraded from version 0.14 to 0.24.
+
+=item C<File::Path>
+
+Upgraded from version 2.04 to 2.08_01.
+
+=item C<File::Temp>
+
+Upgraded from version 0.18 to 0.22.
+
+=item C<Filter::Simple>
+
+Upgraded from version 0.82 to 0.84.
+
+=item C<Filter::Util::Call>
+
+Upgraded from version 1.07 to 1.08.
+
+=item C<Getopt::Long>
+
+Upgraded from version 2.37 to 2.38.
+
+=item C<IO>
+
+Upgraded from version 1.23_01 to 1.25_02.
+
+=item C<IO::Zlib>
+
+Upgraded from version 1.07 to 1.10.
+
+=item C<IPC::Cmd>
+
+Upgraded from version 0.40_1 to 0.54.
+
+=item C<IPC::SysV>
+
+Upgraded from version 1.05 to 2.01.
+
+=item C<Locale::Maketext>
+
+Upgraded from version 1.12 to 1.14.
+
+=item C<Locale::Maketext::Simple>
+
+Upgraded from version 0.18 to 0.21.
+
+=item C<Log::Message>
+
+Upgraded from version 0.01 to 0.02.
+
+=item C<Log::Message::Simple>
+
+Upgraded from version 0.04 to 0.06.
+
+=item C<Math::BigInt>
+
+Upgraded from version 1.88 to 1.89_01.
+
+=item C<Math::BigInt::FastCalc>
+
+Upgraded from version 0.16 to 0.19.
+
+=item C<Math::BigRat>
+
+Upgraded from version 0.21 to 0.24.
+
+=item C<Math::Complex>
+
+Upgraded from version 1.37 to 1.56.
+
+=item C<Memoize>
+
+Upgraded from version 1.01_02 to 1.01_03.
+
+=item C<MIME::Base64>
+
+Upgraded from version 3.07_01 to 3.08.
+
+=item C<Module::Build>
+
+Upgraded from version 0.2808_01 to 0.3603.
+
+=item C<Module::CoreList>
+
+Upgraded from version 2.12 to 2.27.
+
+=item C<Module::Load>
+
+Upgraded from version 0.12 to 0.16.
+
+=item C<Module::Load::Conditional>
+
+Upgraded from version 0.22 to 0.34.
+
+=item C<Module::Loaded>
+
+Upgraded from version 0.01 to 0.06.
+
+=item C<Module::Pluggable>
+
+Upgraded from version 3.6 to 3.9.
+
+=item C<Net::Ping>
+
+Upgraded from version 2.33 to 2.36.
+
+=item C<NEXT>
+
+Upgraded from version 0.60_01 to 0.64.
+
+=item C<Object::Accessor>
+
+Upgraded from version 0.32 to 0.36.
+
+=item C<Package::Constants>
+
+Upgraded from version 0.01 to 0.02.
+
+=item C<PerlIO>
+
+Upgraded from version 1.04 to 1.06.
+
+=item C<Pod::Parser>
+
+Upgraded from version 1.35 to 1.37.
+
+=item C<Pod::Perldoc>
+
+Upgraded from version 3.14_02 to 3.15_02.
+
+=item C<Pod::Plainer>
+
+Upgraded from version 0.01 to 1.02.
+
+NOTE: C<Pod::Plainer> is deprecated and may be removed from a future version of Perl.
+
+=item C<Pod::Simple>
+
+Upgraded from version 3.05 to 3.13.
+
+=item C<Safe>
+
+Upgraded from version 2.12 to 2.22.
-=head2 Dual-lifed modules moved
+=item C<SelfLoader>
-Dual-lifed modules maintained primarily in the Perl core now live in dist/.
-Dual-lifed modules maintained primarily on CPAN now live in cpan/
+Upgraded from version 1.11 to 1.17.
-In previous releases of Perl, it was customary to enumerate all module
-changes in this section of the C<perldelta> file. From 5.11.0 forward
-only notable updates (such as new or deprecated modules ) will be listed
-in this section. For a complete reference to the versions of modules
-shipped in a given release of perl, please see L<Module::CoreList>.
+=item C<Storable>
-=head2 New Modules and Pragmata
+Upgraded from version 2.18 to 2.22.
-=over 4
+=item C<Switch>
-=item *
+Upgraded from version 2.13 to 2.16.
-C<autodie>
+NOTE: C<Switch> is deprecated and may be removed from a future version of Perl.
-This is a new lexically-scoped alternative for the C<Fatal> module.
-The bundled version is 2.06_01. Note that in this release, using a string
-eval when C<autodie> is in effect can cause the autodie behaviour to leak
-into the surrounding scope. See L<autodie/"BUGS"> for more details.
+=item C<Sys::Syslog>
-=item *
+Upgraded from version 0.22 to 0.27.
-C<Compress::Raw::Bzip2>
+=item C<Term::ANSIColor>
-This has been added to the core (version 2.020).
+Upgraded from version 1.12 to 2.02.
-=item *
+=item C<Term::UI>
-C<parent>
+Upgraded from version 0.18 to 0.20.
-This pragma establishes an ISA relationship with base classes at compile
-time. It provides the key feature of C<base> without further unwanted
-behaviors.
+=item C<Test>
-=item *
+Upgraded from version 1.25 to 1.25_02.
-C<Parse::CPAN::Meta>
+=item C<Test::Harness>
-This has been added to the core (version 1.39).
+Upgraded from version 2.64 to 3.17.
-=back
+=item C<Test::Simple>
-=head2 Pragmata Changes
+Upgraded from version 0.72 to 0.94.
-=over 4
+=item C<Text::Balanced>
-=item *
+Upgraded from version 2.0.0 to 2.02.
-C<overloading>
+=item C<Text::ParseWords>
-See L</"The C<overloading> pragma"> above.
+Upgraded from version 3.26 to 3.27.
-=item *
+=item C<Text::Soundex>
-C<attrs>
+Upgraded from version 3.03 to 3.03_01.
-The C<attrs> pragma has been removed. It had been marked as deprecated since
-5.6.0.
+=item C<Thread::Queue>
-=item *
+Upgraded from version 2.00 to 2.11.
-C<charnames>
+=item C<Thread::Semaphore>
-The Unicode F<NameAliases.txt> database file has been added. This has the
-effect of adding some extra C<\N> character names that formerly wouldn't
-have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">.
+Upgraded from version 2.01 to 2.09.
-=item *
+=item C<Tie::RefHash>
-C<feature>
+Upgraded from version 1.37 to 1.38.
-The meaning of the C<:5.10> and C<:5.10.X> feature bundles has
-changed slightly. The last component, if any (i.e. C<X>) is simply ignored.
-This is predicated on the assumption that new features will not, in
-general, be added to maintenance releases. So C<:5.10> and C<:5.10.X>
-have identical effect. This is a change to the behaviour documented for
-5.10.0.
+=item C<Time::HiRes>
-=item *
+Upgraded from version 1.9711 to 1.9719.
-C<mro>
+=item C<Time::Local>
-Upgraded from version 1.00 to 1.01. Performance for single inheritance is 40%
-faster - see L</"Performance Enhancements"> below.
+Upgraded from version 1.18 to 1.1901_01.
-C<mro> is now implemented as an XS extension. The documented interface has not
-changed. Code relying on the implementation detail that some C<mro::>
-methods happened to be available at all times gets to "keep both pieces".
+=item C<Time::Piece>
-=item *
+Upgraded from version 1.12 to 1.15.
-C<diagnostics>
+=item C<Unicode::Collate>
-Supports %.0f formatting internally.
+Upgraded from version 0.52 to 0.52_01.
-=item *
+=item C<Unicode::Normalize>
-C<overload>
+Upgraded from version 1.02 to 1.03.
-Allow overloading of 'qr'.
+=item C<Win32>
-=item *
+Upgraded from version 0.34 to 0.39.
-C<constant>
+=item C<Win32API::File>
-Upgraded from version 1.19 to 1.20.
+Upgraded from version 0.1001_01 to 0.1101.
-=item *
+=item C<XSLoader>
-C<diagnostics>
+Upgraded from version 0.08 to 0.10.
-This pragma no longer suppresses C<Use of uninitialized value in range
-(or flip)> warnings. [perl #71204]
+=back
-=item *
+=head2 Removed Modules and Pragmata
-C<feature>
+=over 4
-Upgraded from 1.13 to 1.14. Added the C<unicode_strings> feature:
+=item C<attrs>
- use feature "unicode_strings";
+Removed from the Perl core. Prior version was 1.02.
-This pragma turns on Unicode semantics for the case-changing operations
-(C<uc>, C<lc>, C<ucfirst>, C<lcfirst>) on strings that don't have the
-internal UTF-8 flag set, but that contain single-byte characters between
-128 and 255.
+=item C<CPAN::API::HOWTO>
-=item *
+Removed from the Perl core. Prior version was 'undef'.
-C<threads>
+=item C<CPAN::DeferedCode>
-Upgraded from version 1.74 to 1.75.
+Removed from the Perl core. Prior version was 5.50.
-=item *
+=item C<CPANPLUS::inc>
-C<less>
+Removed from the Perl core. Prior version was 'undef'.
-Upgraded from version 0.02 to 0.03.
+=item C<DCLsym>
-This version introduces the C<stash_name> method to allow subclasses of
-C<less> to pick where in %^H to store their stash.
+Removed from the Perl core. Prior version was 1.03.
-=item *
+=item C<ExtUtils::MakeMaker::bytes>
-C<version>
+Removed from the Perl core. Prior version was 6.42.
-Upgraded from version 0.77 to 0.81.
+=item C<ExtUtils::MakeMaker::vmsish>
-This version adds support for L</Version number formats> as described earlier
-in this document and in its own documentation.
+Removed from the Perl core. Prior version was 6.42.
-=item *
+=item C<Stdio>
-C<warnings>
+Removed from the Perl core. Prior version was 2.3.
-Upgraded from 1.07 to 1.09.
+=item C<Test::Harness::Assert>
-Added new C<warnings::fatal_enabled()> function.
-This version adds the C<illegalproto> warning category. See also L</New or
-Changed Diagnostics> for this change.
+Removed from the Perl core. Prior version was 0.02.
-=back
+=item C<Test::Harness::Iterator>
+Removed from the Perl core. Prior version was 0.02.
-=head2 Updated Modules
+=item C<Test::Harness::Point>
-=over 4
+Removed from the Perl core. Prior version was 0.01.
-=item XXX TODO RECALCULATE THIS VS 5.10.0
+=item C<Test::Harness::Results>
-=back
+Removed from the Perl core. Prior version was 0.01.
-=head2 Removed Modules and Pragmata
+=item C<Test::Harness::Straps>
-=over 4
+Removed from the Perl core. Prior version was 0.26_01.
-=item *
+=item C<Test::Harness::Util>
-C<Devel::DProf::V>
+Removed from the Perl core. Prior version was 0.01.
-Removed from the Perl core. Prior version was 'undef'.
+=item C<XSSymSet>
+
+Removed from the Perl core. Prior version was 1.1.
=back
+=head2 Deprecated Modules and Pragmata
+
+See L</Deprecated Modules> above.
+
+
=head1 Documentation
=head2 New Documentation
=item *
-L<perlhaiku>
-
-This contains instructions on how to build perl for the Haiku platform.
+L<perlhaiku> contains instructions on how to build perl for the Haiku platform.
=item *
-L<perlmroapi>
-
-This describes the new interface for pluggable Method Resolution Orders.
+L<perlmroapi> describes the new interface for pluggable Method Resolution Orders.
=item *
-L<perlperf>
-
-This document, by Richard Foley, provides an introduction to the use of
+L<perlperf>, by Richard Foley, provides an introduction to the use of
performance and optimization techniques which can be used with particular
reference to perl programs.
=item *
-L<perlrepository>
-
-This describes how to access the perl source using the I<git> version
+L<perlrepository> describes how to access the perl source using the I<git> version
control system.
=item *
=head2 Changes to Existing Documentation
+
+=over
+
+
+=item *
+
The various large F<Changes*> files (which listed every change made to perl
over the last 18 years) have been removed, and replaced by a small file,
also called F<Changes>, which just explains how that same information may
be extracted from the git version control system.
-The file F<Porting/patching.pod> has been deleted, as it mainly described
+=item *
+
+F<Porting/patching.pod> has been deleted, as it mainly described
interacting with the old Perforce-based repository, which is now obsolete.
Information still relevant has been moved to L<perlrepository>.
-L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
-generated at build time, rather than being shipped as part of the release.
-=over
+=item *
+
+The syntax C<unless (EXPR) BLOCK else BLOCK> is now documented as valid, as
+is the syntax C<unless (EXPR) BLOCK elsif (EXPR) BLOCK ... else BLOCK>,
+although actually using the latter may not be the best idea for the
+readability of your source code.
+
=item *
=item *
-Documented C<when> as a syntax modifier
+Documented C<when> as a syntax modifier.
=item *
Correct previous documentation: v-strings are not deprecated
-With version objects, we need them to use MODULE VERSION syntax. This
+With version objects, we need them to use MODULE VERSION syntax. This
patch removes the deprecation notice.
=item *
-Added security contact information to L<perlsec>
+Security contact information is now part of L<perlsec>.
+
+=item *
A significant fraction of the core documentation has been updated to clarify
the behavior of Perl's Unicode handling.
for clarity, consistent use of language, and to fix the spelling of Tom
Christiansen's name.
+=item *
+
The Pod specification (L<perlpodspec>) has been updated to bring the
specification in line with modern usage already supported by most Pod
-systems. A parameter string may now follow the format name in a
-"begin/end" region. Links to URIs with a text description are now
-allowed. The usage of C<LE<lt>"section"E<gt>> has been marked as
+systems. A parameter string may now follow the format name in a
+"begin/end" region. Links to URIs with a text description are now
+allowed. The usage of C<LE<lt>"section"E<gt>> has been marked as
deprecated.
+=item *
+
L<if.pm|if> has been documented in L<perlfunc/use> as a means to get
conditional loading of modules despite the implicit BEGIN block around
C<use>.
The documentation for C<$1> in perlvar.pod has been clarified.
+=item *
+
+C<\N{U+I<wide hex char>}> is now documented.
+
=back
-=head1 Performance Enhancements
+=head1 Selected Performance Enhancements
=over 4
=item *
-Faster C<Perl_sv_utf8_upgrade()>
+C<Perl_sv_utf8_upgrade()> is now faster.
+
+=item *
+
+C<keys> on empty hash is now faster.
=item *
-Speed up C<keys> on empty hash
+C<if (%foo)> has been optimized to be faster than C<if (keys %foo)>.
=item *
-C<if (%foo)> has been optimized to be faster than C<if (keys %foo)>
+The string repetition operator (C<$str x $num>) is now several times faster
+when C<$str> has length one or C<$num> is large.
=item *
=head1 Installation and Configuration Improvements
-=head2 F<ext/> reorganisation
-
-The layout of directories in F<ext> has been revised. Specifically, all
-extensions are now flat, and at the top level, with C</> in pathnames
-replaced by C<->, so that F<ext/Data/Dumper/> is now F<ext/Data-Dumper/>,
-etc. The names of the extensions as specified to F<Configure>, and as
-reported by C<%Config::Config> under the keys C<dynamic_ext>,
-C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and
-still use C</>. Hence this change will not have any affect once perl is
-installed. C<Safe> has been split out from being part of C<Opcode>, and
-C<mro> is now an extension in its own right.
-
-Nearly all dual-life modules have been moved from F<lib> to F<ext>, and will
-now appear as known C<nonxs_ext>. This will made no difference to the
-structure of an installed perl, nor will the modules installed differ,
-unless you run F<Configure> with options to specify an exact list of
-extensions to build. In this case, you will rapidly become aware that you
-need to add to your list, because various modules needed to complete the
-build, such as C<ExtUtils::ParseXS>, have now become extensions, and
-without them the build will fail well before it attempts to run the
-regression tests.
-
-=head2 Configuration improvements
+=over 4
+
+=item *
+
+L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
+generated at build time, rather than being shipped as part of the release.
+
+=item *
If C<vendorlib> and C<vendorarch> are the same, then they are only added to
C<@INC> once.
+=item *
+
C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if
perl is built with C<-Dusedevel>.
+=item *
+
F<Configure> will enable use of C<-fstack-protector>, to provide protection
against stack-smashing attacks, if the compiler supports it.
+=item *
+
F<Configure> will now determine the correct prototypes for re-entrant
functions and for C<gconvert> if you are using a C++ compiler rather
than a C compiler.
+=item *
+
On Unix, if you build from a tree containing a git repository, the
configuration process will note the commit hash you have checked out, for
display in the output of C<perl -v> and C<perl -V>. Unpushed local commits
are automatically added to the list of local patches displayed by
C<perl -V>.
-USE_ATTRIBUTES_FOR_PERLIO is now reported in the compile-time options
-listed by the C<-V> switch.
+=item *
+
+Perl now supports SystemTap's C<dtrace> compatibility layer and an
+issue with linking C<miniperl> has been fixed in the process.
-=head2 Compilation improvements
+=item *
+
+perldoc now uses C<less -R> instead of C<less> for improved behaviour
+in the face of C<groff>'s new usage of ANSI escape codes.
+
+=item *
+
+
+C<perl -V> now reports use of the compile-time options C<USE_PERL_ATOF> and
+C<USE_ATTRIBUTES_FOR_PERLIO>.
+
+=item *
As part of the flattening of F<ext>, all extensions on all platforms are
built by F<make_ext.pl>. This replaces the Unix-specific
F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific
F<win32/buildext.pl>.
-=head1 Changed Internals
+=back
-=over 4
+=head1 Internal Changes
+
+Each release of Perl sees numerous internal changes which shouldn't
+affect day to day usage but may still be notable for developers working
+with Perl's source code.
+
+=over
=item *
-C<Perl_pmflag> has been removed from the public API. Calling it now
-generates a deprecation warning, and it will be removed in a future
-release. Although listed as part of the API, it was never documented,
-and only ever used in F<toke.c>, and prior to 5.10, F<regcomp.c>. In
-core, it has been replaced by a static function.
+The J.R.R. Tolkien quotes at the head of C source file have been checked and
+proper citations added, thanks to a patch from Tom Christiansen.
=item *
-Perl_magic_setmglob now knows about globs, fixing RT #71254.
+The internal structure of the dual-life modules traditionally found in
+the F<lib/> and F<ext/> directories y in the perl source has changed
+significantly. Where possible, dual-lifed modules have been extracted
+from F<lib/> and F<ext/>.
+
+Dual-lifed modules maintained by Perl's developers as part of the Perl
+core now live in F<dist/>. Dual-lifed modules maintained primarily on
+CPAN now live in F<cpan/>. When reporting a bug in a module located
+under F<cpan/>, please send your bug report directly to the module's
+bug tracker or author, rather than Perl's bug tracker.
=item *
-TODO: C<SVt_RV> is gone. RVs are now stored in IVs
+C<\N{...}> now compiles better, always forces UTF-8 internal representation
+
+Perl's developers have fixed several problems with the recognition of C<\N{...}>
+constructs. As part of this, perl will store any scalar or regex containing
+C<\N{I<name>}> or C<\N{U+I<wide hex char>}> in its definition in
+UTF-8 format. (This was true previously for all occurences of C<\N{I<name>}>
+that did not use a custom translator, but now it's always true.)
=item *
-TODO: REGEXPs are first class
+Perl_magic_setmglob now knows about globs, fixing RT #71254.
=item *
-TODO: OOK is reworked, such that an OOKed scalar is PV not PVIV
+C<SVt_RV> no longer exists. RVs are now stored in IVs.
=item *
-The J.R.R. Tolkien quotes at the head of C source file have been checked and
-proper citations added, thanks to a patch from Tom Christiansen.
+REGEXPs are now first class.
=item *
=item *
-C<SVf_UTF8>
-
-This will call C<SvUTF8_on()> for you. (Note that this does not convert an
+C<SVf_UTF8> will call C<SvUTF8_on()> for you. (Note that this does not convert an
sequence of ISO 8859-1 characters to UTF-8). A wrapper, C<newSVpvn_utf8()>
is available for this.
=item *
-C<SVs_TEMP>
-
-Call C<Perl_sv_2mortal()> on the new SV.
+C<SVs_TEMP> now calls C<Perl_sv_2mortal()> on the new SV.
=back
=item *
-The functions C<PerlIO_find_layer> and C<PerlIO_list_alloc> are now
-exported.
+Perl now exports the functions C<PerlIO_find_layer> and C<PerlIO_list_alloc>.
=item *
=item *
-SV allocation tracing has been added to the diagnostics enabled by C<-Dm>.
-The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if
-that was enabled when the F<perl> binary was compiled.
-
-=item *
-
-Smartmatch resolution tracing has been added as a new diagnostic. Use C<-DM> to
-enable it.
-
-=item *
-
-A new debugging flag C<-DB> now dumps subroutine definitions, leaving
-C<-Dx> for its original purpose of dumping syntax trees.
-
-=item *
-
Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been
replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL>
is clearer to those unfamiliar with the core code.
=head1 Testing
-=head2 New Tests
+=head2 Testing improvements
+
+=over 4
+
+=item Parallel tests
+
+The core distribution can now run its regression tests in parallel on
+Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in
+your environment to the number of tests to run in parallel, and run
+C<make test_harness>. On a Bourne-like shell, this can be done as
+
+ TEST_JOBS=3 make test_harness # Run 3 tests in parallel
+
+An environment variable is used, rather than parallel make itself, because
+L<TAP::Harness> needs to be able to schedule individual non-conflicting test
+scripts itself, and there is no standard interface to C<make> utilities to
+interact with their job schedulers.
+
+Note that currently some test scripts may fail when run in parallel (most
+notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts
+again sequentially and see if the failures go away.
+
+=item Test harness flexibility
+
+It's now possible to override C<PERL5OPT> and friends in F<t/TEST>
+
+=item Test watchdog
-Many modules updated from CPAN incorporate new tests.
Several tests that have the potential to hang forever if they fail now
incorporate a "watchdog" functionality that will kill them after a timeout,
which helps ensure that C<make test> and C<make test_harness> run to
-completion automatically. (Jerry Hedden).
+completion automatically.
+
+
+=back
+
+=head2 New Tests
-Some core-specific tests have been added:
+Perl's developers have added a number of new tests to the core.
+In addition to the items listed below, many modules updated from CPAN
+incorporate new tests.
=over 4
=item *
-F<t/op/while_readdir.t>
-
-Test that a bare readdir in while loop sets $_.
+F<t/op/while_readdir.t> tests that a bare readdir in while loop sets $_.
=item *
-F<t/comp/retainedlines.t>
-
-Check that the debugger can retain source lines from C<eval>.
+F<t/comp/retainedlines.t> checks that the debugger can retain source lines from C<eval>.
=item *
-F<t/io/perlio_fail.t>
-
-Check that bad layers fail.
+F<t/io/perlio_fail.t> checks that bad layers fail.
=item *
-F<t/io/perlio_leaks.t>
-
-Check that PerlIO layers are not leaking.
+F<t/io/perlio_leaks.t> checks that PerlIO layers are not leaking.
=item *
-F<t/io/perlio_open.t>
-
-Check that certain special forms of open work.
+F<t/io/perlio_open.t> checks that certain special forms of open work.
=item *
-F<t/io/perlio.t>
-
-General PerlIO tests.
+F<t/io/perlio.t> includes general PerlIO tests.
=item *
-F<t/io/pvbm.t>
-
-Check that there is no unexpected interaction between the internal types
+F<t/io/pvbm.t> checks that there is no unexpected interaction between the internal types
C<PVBM> and C<PVGV>.
=item *
-F<t/mro/package_aliases.t>
-
-Check that mro works properly in the presence of aliased packages.
+F<t/mro/package_aliases.t> checks that mro works properly in the presence of aliased packages.
=item *
-F<t/op/dbm.t>
-
-Tests for C<dbmopen> and C<dbmclose>.
+F<t/op/dbm.t> tests C<dbmopen> and C<dbmclose>.
=item *
-F<t/op/index_thr.t>
-
-Tests for the interaction of C<index> and threads.
+F<t/op/index_thr.t> tests the interaction of C<index> and threads.
=item *
-F<t/op/pat_thr.t>
+F<t/op/pat_thr.t> tests the interaction of esoteric patterns and threads.
+
+=item *
-Tests for the interaction of esoteric patterns and threads.
+F<t/op/qr_gc.t> tests that C<qr> doesn't leak.
=item *
-F<t/op/qr_gc.t>
+F<t/op/reg_email_thr.t> tests the interaction of regex recursion and threads.
+
+=item *
-Test that C<qr> doesn't leak.
+F<t/op/regexp_qr_embed_thr.t> tests the interaction of patterns with embedded C<qr//> and threads.
=item *
-F<t/op/reg_email_thr.t>
+F<t/op/regexp_unicode_prop.t> tests Unicode properties in regular expressions.
+
+=item *
-Tests for the interaction of regex recursion and threads.
+F<t/op/regexp_unicode_prop_thr.t> tests the interaction of Unicode properties and threads.
=item *
-F<t/op/regexp_qr_embed_thr.t>
+F<t/op/reg_nc_tie.t> tests the tied methods of C<Tie::Hash::NamedCapture>.
+
+=item *
-Tests for the interaction of patterns with embedded C<qr//> and threads.
+F<t/op/reg_posixcc.t> checks that POSIX character classes behave consistently.
=item *
-F<t/op/regexp_unicode_prop.t>
+F<t/op/re.t>
-Tests for Unicode properties in regular expressions.
+checks that exportable C<re> functions in F<universal.c> work.
=item *
-F<t/op/regexp_unicode_prop_thr.t>
-
-Tests for the interaction of Unicode properties and threads.
+F<t/op/setpgrpstack.t> checks that C<setpgrp> works.
=item *
-F<t/op/reg_nc_tie.t>
+F<t/op/substr_thr.t> tests the interaction of C<substr> and threads.
+
+=item *
-Test the tied methods of C<Tie::Hash::NamedCapture>.
+F<t/op/upgrade.t> checks that upgrading and assigning scalars works.
=item *
-F<t/op/reg_posixcc.t>
+F<t/uni/lex_utf8.t> checks that Unicode in the lexer works.
+
+=item *
-Check that POSIX character classes behave consistently.
+F<t/uni/tie.t> checks that Unicode and C<tie> work.
=item *
-F<t/op/re.t>
+F<t/comp/final_line_num.t> tests whether line numbers are correct at EOF
+
+=item *
-Check that exportable C<re> functions in F<universal.c> work.
+F<t/comp/form_scope.t> tests format scoping.
=item *
-F<t/op/setpgrpstack.t>
+F<t/comp/line_debug.t> tests whether C<< @{"_<$file"} >> works.
-Check that C<setpgrp> works.
+=item *
+
+F<t/op/filetest_t.t> tests if -t file test works.
=item *
-F<t/op/substr_thr.t>
+F<t/op/qr.t> tests C<qr>.
+
+=item *
-Tests for the interaction of C<substr> and threads.
+F<t/op/utf8cache.t> tests malfunctions of the utf8 cache.
=item *
-F<t/op/upgrade.t>
+F<t/re/uniprops.t> test unicodes C<\p{}> regex constructs.
-Check that upgrading and assigning scalars works.
+=item *
+
+F<t/op/filehandle.t> tests some suitably portable filetest operators
+to check that they work as expected, particularly in the light of some
+internal changes made in how filehandles are blessed.
=item *
-F<t/uni/lex_utf8.t>
+F<t/op/time_loop.t> tests that unix times greater than C<2**63>, which
+can now be handed to C<gmtime> and C<localtime>, do not cause an internal
+overflow or an excessively long loop.
-Check that Unicode in the lexer works.
+=back
-=item *
-F<t/uni/tie.t>
+=head1 New or Changed Diagnostics
-Check that Unicode and C<tie> work.
+=head2 New Diagnostics
-=item *
+=over
-F<t/comp/final_line_num.t>
+=item *
-See if line numbers are correct at EOF
+SV allocation tracing has been added to the diagnostics enabled by C<-Dm>.
+The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if
+that was enabled when the F<perl> binary was compiled.
=item *
-F<t/comp/form_scope.t>
+Smartmatch resolution tracing has been added as a new diagnostic. Use C<-DM> to
+enable it.
+
+=item *
-See if format scoping works
+A new debugging flag C<-DB> now dumps subroutine definitions, leaving
+C<-Dx> for its original purpose of dumping syntax trees.
=item *
-F<t/comp/line_debug.t>
+Perl 5.12 provides a number of new diagnostic messages to help you write
+better code. See L<perldiag> for details of these new messages.
-See if C<< @{"_<$file"} >> works
+=over 4
=item *
-F<t/op/filetest_t.t>
+C<Bad plugin affecting keyword '%s'>
+
+=item *
-See if -t file test works
+C<gmtime(%.0f) too large>
=item *
-F<t/op/qr.t>
+C<Lexing code attempted to stuff non-Latin-1 character into Latin-1 input>
+
+=item *
-See if qr works
+C<Lexing code internal error (%s)>
=item *
-F<t/op/utf8cache.t>
+C<localtime(%.0f) too large>
+
+=item *
-Tests malfunctions of utf8 cache
+C<Overloaded dereference did not return a reference>
=item *
-F<t/re/uniprops.t>
+C<Overloaded qr did not return a REGEXP>
+
+=item *
-Test unicode \p{} regex constructs
+C<Perl_pmflag() is deprecated, and will be removed from the XS API>
-=back
+=item *
-=head2 Testing improvements
+C<lvalue attribute ignored after the subroutine has been defined>
-=over 4
+This new warning is issued when one attempts to mark a subroutine as
+lvalue after it has been defined.
=item *
-It's now possible to override C<PERL5OPT> and friends in F<t/TEST>
+Perl now warns you if C<++> or C<--> are unable to change the value because it's
+beyond the limit of representation.
-=back
+This uses a new warnings category: "imprecision".
+=item *
-=head1 New or Changed Diagnostics
+C<lc>, C<uc>, C<lcfirst>, and C<ucfirst> warn when passed undef.
-Several new diagnostics, see L<perldiag> for details.
+=item *
-=over 4
+C<Show constant in "Useless use of a constant in void context">
=item *
-C<Bad plugin affecting keyword '%s'>
+C<Prototype after '%s'>
=item *
-C<gmtime(%.0f) too large>
+C<panic: sv_chop %s>
-=item *
+This new fatal error occurs when the C routine C<Perl_sv_chop()> was
+passed a position that is not within the scalar's string buffer. This
+could be caused by buggy XS code, and at this point recovery is not
+possible.
-C<Lexing code attempted to stuff non-Latin-1 character into Latin-1 input>
=item *
-C<Lexing code internal error (%s)>
+The fatal error C<Malformed UTF-8 returned by \N> is now produced if the
+C<charnames> handler returns malformed UTF-8.
=item *
-C<localtime(%.0f) too large>
+If an unresolved named character or sequence was encountered when compiling a
+regex pattern then the fatal error C<\N{NAME} must be resolved by the lexer>
+is now produced. This can happen, for example, when using a single-quotish
+context like C<$re = '\N{SPACE}'; /$re/;>. See L<perldiag> for more examples of
+how the lexer can get bypassed.
=item *
-C<Overloaded dereference did not return a reference>
+C<Invalid hexadecimal number in \N{U+...}> is a new fatal error triggered when
+the character constant represented by C<...> is not a valid hexadecimal
+number.
=item *
-C<Overloaded qr did not return a REGEXP>
+The new meaning of C<\N> as C<[^\n]> is not valid in a bracketed character
+class, just like C<.> in a character class loses its special meaning, and will
+cause the fatal error C<\N in a character class must be a named character: \N{...}>.
=item *
-C<Perl_pmflag() is deprecated, and will be removed from the XS API>
+The rules on what is legal for the C<...> in C<\N{...}> have been tightened
+up so that unless the C<...> begins with an alphabetic character and continues
+with a combination of alphanumerics, dashes, spaces, parentheses or colons
+then the warning C<Deprecated character(s) in \N{...} starting at '%s'> is
+now issued.
=item *
-New warning category C<illegalproto>
+The warning C<Using just the first characters returned by \N{}> will be
+issued if the C<charnames> handler returns a sequence of characters which
+exceeds the limit of the number of characters that can be used. The message
+will indicate which characters were used and which were discarded.
-The two warnings :
+=back
- Illegal character in prototype for %s : %s
- Prototype after '%c' for %s : %s
+=back
-have been moved from the C<syntax> top-level warnings category into a new
-first-level category, C<illegalproto>. These two warnings are currently the
-only ones emitted during parsing of an invalid/illegal prototype, so one
-can now do
+=head2 Changed Diagnostics
- no warnings 'illegalproto';
+A number of existing diagnostic messages have been improved or corrected:
-to suppress only those, but not other syntax-related warnings. Warnings where
-prototypes are changed, ignored, or not met are still in the C<prototype>
-category as before. (Matt S. Trout)
+=over
=item *
-lvalue attribute ignored after the subroutine has been defined
+A new warning category C<illegalproto> allows finer-grained control of
+warnings around function prototypes.
-This new warning is issued when one attempts to mark a subroutine as
-lvalue after it has been defined.
+The two warnings:
-=item *
+=over
-warn if C<++> or C<--> are unable to change the value because it's
-beyond the limit of representation
+=item C<Illegal character in prototype for %s : %s>
-This uses a new warnings category: "imprecision".
+=item C<Prototype after '%c' for %s : %s>
-=item *
+=back
-C<lc>, C<uc>, C<lcfirst>, and C<ucfirst> warn when passed undef.
+have been moved from the C<syntax> top-level warnings category into a new
+first-level category, C<illegalproto>. These two warnings are currently the
+only ones emitted during parsing of an invalid/illegal prototype, so one
+can now do
-=item *
+ no warnings 'illegalproto';
-Show constant in "Useless use of a constant in void context"
+to suppress only those, but not other syntax-related warnings. Warnings where
+prototypes are changed, ignored, or not met are still in the C<prototype>
+category as before.
=item *
-Make the new warning report undef constants as undef
-
-=item *
+C<Deep recursion on subroutine "%s">
-Add a new warning, "Prototype after '%s'"
+It is now possible to change the depth threshold for this warning from the
+default of 100, by recompiling the F<perl> binary, setting the C
+pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
=item *
-Tweak the "Illegal character in prototype" warning so it's more precise
+C<Illegal character in prototype> warning is now more precise
when reporting illegal characters after _
=item *
-Correct the unintended interpolation of C<$\> in regex
-
-=item *
-
-Make overflow warnings in C<gmtime> and C<localtime> only occur when
-warnings are enabled
-
-=item *
-
-Improve mro merging error messages.
-
-They are now very similar to those produced by Algorithm::C3.
+mro merging error messages are now very similar to those produced by L<Algorithm::C3>.
=item *
=item *
-Explicitely point to C<$.> when it causes an uninitialized warning for
-ranges in scalar context
+Perl now explicitly points to C<$.> when it causes an uninitialized warning for
+ranges in scalar context.
=item *
-C<split> now warns when called in void context
+C<split> now warns when called in void context.
=item *
=item *
-C<panic: sv_chop %s>
-
-This new fatal error occurs when the C routine C<Perl_sv_chop()> was
-passed a position that is not within the scalar's string buffer. This
-could be caused by buggy XS code, and at this point recovery is not
-possible.
-
-=item *
-
-C<Deep recursion on subroutine "%s">
-
-It is now possible to change the depth threshold for this warning from the
-default of 100, by recompiling the F<perl> binary, setting the C
-pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
-
-=item *
-
Perl now properly returns a syntax error instead of segfaulting
if C<each>, C<keys>, or C<values> is used without an argument.
=item *
-The Windows select() implementation now supports all empty C<fd_set>s
-more correctly.
-
-=item *
-
-The "syntax" category was removed from 5 warnings that should only be in
-"deprecated".
+The C<syntax> category was removed from 5 warnings that should only be in
+C<deprecated>.
=item *
Three fatal C<pack>/C<unpack> error messages have been normalized to
-"panic: %s"
+C<panic: %s>
=item *
-"Unicode character is illegal" has been rephrased to be more accurate
+C<Unicode character is illegal> has been rephrased to be more accurate
It now reads C<Unicode non-character is illegal in interchange> and the
perldiag documentation has been expanded a bit.
=item *
-Perl now defaults to issuing a warning if a deprecated language feature
-is used.
+Currently, all but the first of the several characters that the C<charnames>
+handler may return are discarded when used in a regular expression pattern
+bracketed character class. If this happens then the warning C<Using just the
+first character returned by \N{} in character class> will be issued.
-To disable this feature in a given lexical scope, you should use C<no
-warnings 'deprecated';> For information about which language features
-are deprecated and explanations of various deprecation warnings, please
-see L<perldiag.pod>
+=item *
+
+The warning C<Missing right brace on \N{} or unescaped left brace after \N.
+Assuming the latter> will be issued if Perl encounters a C<\N{> but doesn't
+find a matching C<}>. In this case Perl doesn't know if it was mistakenly
+omitted, or if "match non-newline" followed by "match a C<{>" was desired.
+It assumes the latter because that is actually a valid interpretation as
+written, unlike the other case. If you meant the former, you need to add the
+matching right brace. If you did mean the latter, you can silence this
+warning by writing instead C<\N\{>.
+
+=item *
+
+C<gmtime> and C<localtime> called with numbers smaller than they can reliably
+handle will now issue the warnings C<gmtime(%.0f) too small> and
+C<localtime(%.0f) too small>.
=back
-The following diagnostics have been removed:
+The following diagnostic messages have been removed:
=over 4
C<Can't locate package %s for the parents of %s>
-This warning has been removed. In general, it only got produced in
+In general this warning it only got produced in
conjunction with other warnings, and removing it allowed an ISA lookup
optimisation to be added.
=item *
-F<h2ph>
-
-Now looks in C<include-fixed> too, which is a recent addition to gcc's
+F<h2ph> now looks in C<include-fixed> too, which is a recent addition to gcc's
search path.
=item *
-F<h2xs>
-
-No longer incorrectly treats enum values like macros (Daniel Burr).
-
-Now handles C++ style constants (C<//>) properly in enums. (A patch from
-Rainer Weikusat was used; Daniel Burr also proposed a similar fix).
+F<h2xs> no longer incorrectly treats enum values like macros.
+It also now handles C++ style comments (C<//>) properly in enums.
=item *
-F<perl5db.pl>
-
-C<LVALUE> subroutines now work under the debugger.
-
-The debugger now correctly handles proxy constant subroutines, and
+F<perl5db.pl> now supports C<LVALUE> subroutines. Additionally, the
+debugger now correctly handles proxy constant subroutines, and
subroutine stubs.
=item *
-F<perlbug>
+F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out
+upstream bug tracker URLs. If a user identifies a particular module
+as the topic of their bug report and we're able to divine the URL for
+its upstream bug tracker, perlbug now provide a message to the user
+explaining that the core copies the CPAN version directly, and provide
+the URL for reporting the bug directly to the upstream author.
-F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out upstream bug
-tracker URLs.
-
-Where the user names a module that their bug report is about, and we know the
-URL for its upstream bug tracker, provide a message to the user explaining
-that the core copies the CPAN version directly, and provide the URL for
-reporting the bug directly to upstream.
-
-=item *
-
-F<perlthanks>
-
-Perl 5.11.0 added a new utility F<perlthanks>, which is a variant of
-F<perlbug>, but for sending non-bug-reports to the authors and maintainers
-of Perl. Getting nothing but bug reports can become a bit demoralising:
-we'll see if this changes things.
+F<perlbug> no longer reports "Message sent" when it hasn't actually sent the message
=item *
-F<perlbug>
-
-No longer reports "Message sent" when it hasn't actually sent the message
+F<perlthanks> is a new utility for sending non-bug-reports to the
+authors and maintainers of Perl. Getting nothing but bug reports can
+become a bit demoralising. If Perl 5.12 works well for you, please try
+out F<perlthanks>. It will make the developers smile.
=item *
-F<a2p>
-
-Fixed bugs with the match() operator in list context, remove mention of
-C<$[>.
+Perl's developers have fixed bugs in F<a2p> having to do with the
+C<match()> operator in list context. Additionally, F<a2p> no longer
+generates code that uses the C<$[> variable.
=back
=item *
-Ensure that pp_qr returns a new regexp SV each time. Resolves RT #69852.
+U+0FFFF is now a legal character in regular expressions.
+
+=item *
+
+pp_qr now always returns a new regexp SV. Resolves RT #69852.
Instead of returning a(nother) reference to the (pre-compiled) regexp in the
optree, use reg_temp_copy() to create a copy of it, and return a reference to
C<kill> is now fatal when called on non-numeric process identifiers.
Previously, an C<undef> process identifier would be interpreted as a
request to kill process 0, which would terminate the current process
-group on POSIX systems. Since process identifiers are always integers,
+group on POSIX systems. Since process identifiers are always integers,
killing a non-numeric process is now fatal.
=item *
5.10.0 inadvertently disabled an optimisation, which caused a measurable
performance drop in list assignment, such as is often used to assign
function parameters from C<@_>. The optimisation has been re-instated, and
-the performance regression fixed. (This fix is also present in 5.10.1)
+the performance regression fixed. (This fix is also present in 5.10.1)
=item *
=item *
The block form of C<eval> is now specifically trappable by C<Safe> and
-C<ops>. Previously it was erroneously treated like string C<eval>.
+C<ops>. Previously it was erroneously treated like string C<eval>.
=item *
=item *
-On Windows, C<'.\foo'> and C<'..\foo'> were treated differently than
-C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492].
-
-=item *
-
Assigning a format to a glob could corrupt the format; e.g.:
*bar=*foo{FORMAT}; # foo format now bad
In C<unpack>, the use of C<()> groups in scalar context was internally
placing a list on the interpreter's stack, which manifested in various
-ways, including SEGVs. This is now fixed [RT #50256].
+ways, including SEGVs. This is now fixed [RT #50256].
=item *
=item *
-Previously missing files from Unicode 5.1 Character Database are now included.
+Perl now includes previously missing files from the Unicode Character Database.
=item *
-C<TMPDIR> is now honored when opening an anonymous temporary file
+Perl now honors C<TMPDIR> when opening an anonymous temporary file.
=back
+
=head1 Platform Specific Changes
+Perl is incredibly portable. In general, if a platform has a C compiler,
+someone has ported Perl to it (or will soon). We're happy to announce
+that Perl 5.12 includes support for several new platforms. At the same
+time, it's time to bid farewell to some (very) old friends.
+
=head2 New Platforms
=over
=item Haiku
-Patches from the Haiku maintainers have been merged in. Perl should now
+Perl's developers have merged patches from Haiku's maintainers. Perl should now
build on Haiku.
=item MirOS BSD
Perl should now build on MirOS BSD.
-
=back
=head2 Discontinued Platforms
=over
-=item DomainOS
+=item Domain/OS
+
+=item MiNT
-Support for Apollo DomainOS was removed in Perl 5.11.0
+=item Tenon MachTen
-=item MachTen
+=back
-Support for Tenon Intersystems MachTen Unix layer for MacOS Classic was
-removed in Perl 5.11.0
+=head2 Updated Platforms
-=item MiNT
+=over 4
+
+=item AIX
+
+=over 4
+
+=item *
+
+Removed F<libbsd> for AIX 5L and 6.1. Only C<flock()> was used from F<libbsd>.
-Support for Atari MiNT was removed in Perl 5.11.0.
+=item *
+
+Removed F<libgdbm> for AIX 5L and 6.1 if F<libgdbm> < 1.8.3-5 is installed.
+The F<libgdbm> is delivered as an optional package with the AIX Toolbox.
+Unfortunately the versions below 1.8.3-5 are broken.
+
+=item *
+
+Hints changes mean that AIX 4.2 should work again.
=back
-=head2 Updated Platforms
+=item Cygwin
=over 4
+=item *
+
+Perl now supports IPv6 on Cygwin 1.7 and newer.
+
+=item *
+
+On Cygwin we now strip the last number from the DLL. This has been the
+behaviour in the cygwin.com build for years. The hints files have been
+updated.
+
+=back
+
=item Darwin (Mac OS X)
=over 4
=back
-=item Win32
+=item FreeBSD
=over 4
=item *
-Initial support for mingw64 is now available
-
-=item *
-
-Various bits of Perl's build infrastructure are no longer converted to
-win32 line endings at release time. If this hurts you, please report the
-problem with the L<perlbug> program included with perl.
-
-=item *
+The hints files now identify the correct threading libraries on FreeBSD 7
+and later.
-Always add a manifest resource to C<perl.exe> to specify the C<trustInfo>
-settings for Windows Vista and later. Without this setting Windows
-will treat C<perl.exe> as a legacy application and apply various
-heuristics like redirecting access to protected file system areas
-(like the "Program Files" folder) to the users "VirtualStore"
-instead of generating a proper "permission denied" error.
+=back
-For VC8 and VC9 this manifest setting is automatically generated by
-the compiler/linker (together with the binding information for their
-respective runtime libraries); for all other compilers we need to
-embed the manifest resource explicitly in the external resource file.
+=item Irix
-This change also requests the Microsoft Common-Controls version 6.0
-(themed controls introduced in Windows XP) via the dependency list
-in the assembly manifest. For VC8 and VC9 this is specified using the
-C</manifestdependency> linker commandline option instead.
+=over 4
=item *
-Improved message window handling means that C<alarm> and C<kill> messages
-will no longer be dropped under race conditions.
+We now work around a bizarre preprocessor bug in the Irix 6.5 compiler:
+C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't.
=back
-=item cygwin
+=item NetBSD
=over 4
=item *
-Enable IPv6 support on cygwin 1.7 and newer
+Hints now supports versions 5.*.
=back
=item *
-Make -UDEBUGGING the default on VMS for 5.12.0.
+C<-UDEBUGGING> is now the default on VMS.
-Like it has been everywhere else for ages and ages. Also make
+Like it has been everywhere else for ages and ages. Also make
command-line selection of -UDEBUGGING and -DDEBUGGING work in
configure.com; before the only way to turn it off was by saying
no in answer to the interactive question.
Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit
status in a VMS condition value for better interaction with GNV's bash
-shell and other utilities that depend on POSIX exit values. See
+shell and other utilities that depend on POSIX exit values. See
L<perlvms/"$?"> for details.
=item *
=back
-=item AIX
+=item Stratus VOS
-Removed F<libbsd> for AIX 5L and 6.1. Only C<flock()> was used from F<libbsd>.
+=over 4
-Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an
-optional package with the AIX Toolbox. Unfortunately the 64 bit version
-is broken.
+=item *
-Hints changes mean that AIX 4.2 should work again.
+Various changes from Stratus have been merged in.
-=item Cygwin
+=back
-On Cygwin we now strip the last number from the DLL. This has been the
-behaviour in the cygwin.com build for years. The hints files have been
-updated.
+=item Symbian
+=over 4
-=item FreeBSD
+=item *
-The hints files now identify the correct threading libraries on FreeBSD 7
-and later.
+There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK.
-=item Irix
+=back
-We now work around a bizarre preprocessor bug in the Irix 6.5 compiler:
-C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't.
+=item Windows
-=item NetBSD
+=over 4
-Hints now supports versions 5.*.
+=item *
-=item Stratus VOS
+Perl 5.12 supports Windows 2000 and later. The supporting code for
+legacy versions of Windows is still included, but will be removed
+during the next development cycle.
-Various changes from Stratus have been merged in.
+=item *
-=item Symbian
+Initial support for building Perl with MinGW-w64 is now available.
-There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK.
+=item *
+
+F<perl.exe> now includes a manifest resource to specify the C<trustInfo>
+settings for Windows Vista and later. Without this setting Windows
+would treat F<perl.exe> as a legacy application and apply various
+heuristics like redirecting access to protected file system areas
+(like the "Program Files" folder) to the users "VirtualStore"
+instead of generating a proper "permission denied" error.
+
+The manifest resource also requests the Microsoft Common-Controls
+version 6.0 (themed controls introduced in Windows XP). Check out the
+Win32::VisualStyles module on CPAN to switch back to old style
+unthemed controls for legacy applications.
+
+=item *
+
+The C<-t> filetest operator now only returns true if the filehandle
+is connected to a console window. In previous versions of Perl it
+would return true for all character mode devices, including F<NUL>
+and F<LPT1>.
+
+=item *
+
+The C<-p> filetest operator now works correctly, and the
+Fcntl::S_IFIFO constant is defined when Perl is compiled with
+Microsoft Visual C. In previous Perl versions C<-p> always
+returned a false value, and the Fcntl::S_IFIFO constant
+was not defined.
+
+This bug is specific to Microsoft Visual C and never affected
+Perl binaries built with MinGW.
+
+=item *
+
+The socket error codes are now more widely supported: The POSIX
+module will define the symbolic names, like POSIX::EWOULDBLOCK,
+and stringification of socket error codes in $! works as well
+now;
+
+ C:\>perl -MPOSIX -E "$!=POSIX::EWOULDBLOCK; say $!"
+ A non-blocking socket operation could not be completed immediately.
+
+=item *
+
+flock() will now set sensible error codes in $!. Previous Perl versions
+copied the value of $^E into $!, which caused much confusion.
+
+=item *
+
+select() now supports all empty C<fd_set>s more correctly.
+
+=item *
+
+C<'.\foo'> and C<'..\foo'> were treated differently than
+C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492].
+
+=item *
+
+Improved message window handling means that C<alarm> and C<kill> messages
+will no longer be dropped under race conditions.
+
+=item *
+
+Various bits of Perl's build infrastructure are no longer converted to
+win32 line endings at release time. If this hurts you, please report the
+problem with the L<perlbug> program included with perl.
=back
+=back
+
+
=head1 Known Problems
This is a list of some significant unfixed bugs, which are regressions
-from either 5.10.0 or 5.8.x.
+from either 5.10.x or 5.8.x.
=over 4
=item *
-Untriaged test crashes on Windows 2000
-
-Several porters have reported mysterious crashes when Perl's entire test suite is run after a build on certain Windows 2000 systems. When run by hand, the individual tests reportedly work fine.
+Things like C<"\N{LATIN SMALL LIGATURE FF}" =~ /\N{LATIN SMALL LETTER F}+/>
+will appear to hang as they get into a very long running loop [RT #72998].
=item *
-Known test failures on VMS
+Several porters have reported mysterious crashes when Perl's entire
+test suite is run after a build on certain Windows 2000 systems. When
+run by hand, the individual tests reportedly work fine.
-Perl 5.11.1 fails a small set of core and CPAN tests as of this release.
-With luck, that'll be sorted out for 5.11.2
+=back
+
+=head1 Errata
+
+=over
=item *
-Known test failures on VMS
+This one is actually a change introduced in 5.10.0, but it was missed
+from that release's perldelta, so it is mentioned here instead.
+
+A bugfix related to the handling of the C</m> modifier and C<qr> resulted
+in a change of behaviour between 5.8.x and 5.10.0:
-Perl 5.11.2 fails a small set of core and CPAN tests as of this
-release. With luck, that'll be sorted out for 5.11.3.
+ # matches in 5.8.x, doesn't match in 5.10.0
+ $re = qr/^bar/; "foo\nbar" =~ /$re/m;
=back
=head1 Acknowledgements
Perl 5.12.0 represents approximately two years of development since
-Perl 5.10.0 and contains __ lines of changes across ___ files
-from __ authors and committers:
-
-XXX TODO LIST
+Perl 5.10.0 and contains over 750,000 lines of changes across over
+3,000 files from over 200 authors and committers.
+
+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 5.12.0:
+
+Aaron Crane, Abe Timmerman, Abhijit Menon-Sen, Abigail, Adam Russell,
+Adriano Ferreira, Ævar Arnfjörð Bjarmason, Alan Grover, Alexandr
+Ciornii, Alex Davies, Alex Vandiver, Andreas Koenig, Andrew Rodland,
+andrew@sundale.net, Andy Armstrong, Andy Dougherty, Jose AUGUSTE-ETIENNE,
+Benjamin Smith, Ben Morrow, bharanee rathna, Bo Borgerson, Bo Lindbergh,
+Brad Gilbert, Bram, Brendan O'Dea, brian d foy, Charles Bailey,
+Chip Salzenberg, Chris 'BinGOs' Williams, Christoph Lamprecht, Chris
+Williams, chromatic, Claes Jakobsson, Craig A. Berry, Dan Dascalescu,
+Daniel Frederick Crisman, Daniel M. Quinlan, Dan Jacobson, Dan Kogai,
+Dave Mitchell, Dave Rolsky, David Cantrell, David Dick, David Golden,
+David Mitchell, David M. Syzdek, David Nicol, David Wheeler, Dennis
+Kaarsemaker, Dintelmann, Peter, Dominic Dunlop, Dr.Ruud, Duke Leto,
+Enrico Sorcinelli, Eric Brine, Father Chrysostomos, Florian Ragwitz,
+Frank Wiegand, Gabor Szabo, Gene Sullivan, Geoffrey T. Dairiki, George
+Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Graham Barr, Green, Paul,
+Hans Dieter Pearcey, Harmen, H. Merijn Brand, Hugo van der Sanden,
+Ian Goodacre, Igor Sutton, Ingo Weinhold, James Bence, James Mastros,
+Jan Dubois, Jari Aalto, Jarkko Hietaniemi, Jay Hannah, Jerry Hedden,
+Jesse Vincent, Jim Cromie, Jody Belka, John E. Malmberg, John Malmberg,
+John Peacock, John Peacock via RT, John P. Linderman, John Wright,
+Josh ben Jore, Jos I. Boumans, Karl Williamson, Kenichi Ishigaki, Ken
+Williams, Kevin Brintnall, Kevin Ryde, Kurt Starsinic, Leon Brocard,
+Lubomir Rintel, Luke Ross, Marcel Grünauer, Marcus Holland-Moritz, Mark
+Jason Dominus, Marko Asplund, Martin Hasch, Mashrab Kuvatov, Matt Kraai,
+Matt S Trout, Max Maischein, Michael Breen, Michael Cartmell, Michael
+G Schwern, Michael Witten, Mike Giroux, Milosz Tanski, Moritz Lenz,
+Nicholas Clark, Nick Cleaton, Niko Tyni, Offer Kaye, Osvaldo Villalon,
+Paul Fenwick, Paul Gaborit, Paul Green, Paul Johnson, Paul Marquess,
+Philip Hazel, Philippe Bruhat, Rafael Garcia-Suarez, Rainer Tammer,
+Rajesh Mandalemula, Reini Urban, Renée Bäcker, Ricardo Signes,
+Ricardo SIGNES, Richard Foley, Rich Rauenzahn, Rick Delaney, Risto
+Kankkunen, Robert May, Roberto C. Sanchez, Robin Barker, SADAHIRO
+Tomoyuki, Salvador Ortiz Garcia, Sam Vilain, Scott Lanning, Sébastien
+Aperghis-Tramoni, Sérgio Durigan Júnior, Shlomi Fish, Simon 'corecode'
+Schubert, Sisyphus, Slaven Rezic, Smylers, Steffen Müller, Steffen
+Ullrich, Stepan Kasal, Steve Hay, Steven Schubiger, Steve Peters, Tels,
+The Doctor, Tim Bunce, Tim Jenness, Todd Rinaldo, Tom Christiansen,
+Tom Hukins, Tom Wyant, Tony Cook, Torsten Schoenfeld, Tye McQueen,
+Vadim Konovalov, Vincent Pit, Hio YAMASHINA, Yasuhiro Matsumoto,
+Yitzchak Scott-Thoennes, Yuval Kogman, Yves Orton, Zefram, Zsban 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 5.12.0 better. For a more complete
+list of all of Perl's historical contributors, please see the C<AUTHORS>
+file in the Perl 5.12.0 distribution.
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
If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl
-bug database at L<http://rt.perl.org/perlbug/>. There may also be
+bug database at L<http://rt.perl.org/perlbug/>. There may also be
information at L<http://www.perl.org/>, the Perl Home Page.
If you believe you have an unreported bug, please run the B<perlbug>
-program included with your release. Be sure to trim your bug down
-to a tiny but sufficient test case. Your bug report, along with the
+program included with your release. Be sure to trim your bug down
+to a tiny but sufficient test case. Your bug report, along with the
output of C<perl -V>, will be sent off to perlbug@perl.org to be
analyzed by the Perl porting team.
projects / p5sagit/p5-mst-13.2.git / blobdiff