2010年4月15日

[installer 2336] perl-5.12.0

perl-5.12.0 出ています。

☆ perl-5.12.0
http://www.perl.com/CPAN/src/
http://www.cpan.org/src/perl-5.12.0.tar.gz

NAME
perl5120delta - what is new for perl v5.12.0


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 are already included in the 5.10.1
maintenance release.

You can see the list of those changes in the 5.10.1 release notes
(perl5101delta).

Core Enhancements
New "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 "our $VERSION = ..." and similar constructs. E.g.

package Foo::Bar 1.23;
# $Foo::Bar::VERSION == 1.23

There are several advantages to this:

* $VERSION is parsed in exactly the same way as "use NAME VERSION"

* $VERSION is set at compile time

* $VERSION is a version object that provides proper overloading of
comparison operators so comparing $VERSION to decimal (1.23) or
dotted-decimal (v1.2.3) version numbers works correctly.

* Eliminates "$VERSION = ..." and "eval $VERSION" clutter

* As it requires VERSION to be a numeric literal or v-string literal,
it can be statically parsed by toolchain modules without "eval" the
way MM->parse_version does for "$VERSION = ..."

It does not break old code with only "package NAME", but code that uses
"package NAME VERSION" will need to be restricted to perl 5.12.0 or
newer This is analogous to the change to "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.

However, "package NAME VERSION" requires a new, 'strict' version number
format. See "Version number formats" for details.

The "..." operator
A new operator, "...", nicknamed the Yada Yada operator, has been added.
It is intended to mark placeholder code that is not yet implemented. See
"Yada Yada Operator" in perlop.

Implicit strictures
Using the "use VERSION" syntax with a version number greater or equal to
5.11.0 will lexically enable strictures just like "use strict" would do
(in addition to enabling features.) The following:

use 5.12.0;

means:

use strict;
use feature ':5.12';

Unicode improvements
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 < http://www.unicode.org/versions/Unicode5.2.0>; for further
details about what's changed in this version of the standard. See
perlunicode for instructions on installing and using other versions of
Unicode.

Additionally, Perl's developers have significantly improved Perl's
Unicode implementation. For full details, see "Unicode overhaul" below.

Y2038 compliance
Perl's core time-related functions are now Y2038 compliant. (It may not
mean much to you, but your kids will love it!)

qr overloading
It is now possible to overload the "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 "=~" operator or when it is
interpolated into a regexp. See overload.

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.

See "PL_keyword_plugin" in perlapi for the mechanism. The Perl core
source distribution also includes a new module 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.

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.

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.

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.

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 "&" sigil.)

A proper interface for pluggable Method Resolution Orders
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 perlmroapi for
more information.

"\N" experimental regex escape
Perl now supports "\N", a new regex escape which you can think of as the
inverse of "\n". It will match any character that is not a newline,
independently from the presence or absence of the single line match
modifier "/s". It is not usable within a character class. "\N{3}" means
to match 3 non-newlines; "\N{5,}" means to match at least 5. "\N{NAME}"
still means the character or sequence named "NAME", but "NAME" no longer
can be things like 3, or "5,".

This will break a custom charnames translator which allows numbers for
character names, as "\N{3}" will now mean to match 3 non-newline
characters, and not the character whose name is 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 "\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.

DTrace support
Perl now has some support for DTrace. See "DTrace support" in INSTALL.

Support for "configure_requires" in CPAN module metadata
Both "CPAN" and "CPANPLUS" now support the "configure_requires" keyword
in the META.yml metadata file included in most recent CPAN
distributions. This allows distribution authors to specify configuration
prerequisites that must be installed before running Makefile.PL or
Build.PL.

See the documentation for "ExtUtils::MakeMaker" or "Module::Build" for
more on how to specify "configure_requires" when creating a distribution
for CPAN.

"each" is now more flexible
The "each" function can now operate on arrays.

"when" as a statement modifier
"when" is now allowed to be used as a statement modifier.

$, flexibility
The variable $, may now be tied.

// in when clauses
// now behaves like || in when clauses

Enabling warnings from your shell environment
You can now set "-W" from the "PERL5OPT" environment variable

"delete local"
"delete local" now allows you to locally delete a hash entry.

New support for Abstract namespace sockets
Abstract namespace sockets are Linux-specific socket type that live in
AF_UNIX family, slightly abusing it to be able to use arbitrary
character arrays as addresses: They start with nul byte and are not
terminated by nul byte, but with the length passed to the socket()
system call.

32-bit limit on substr arguments removed
The 32-bit limit on "substr" arguments has now been removed. The full
range of the system's signed and unsigned integers is now available for
the "pos" and "len" arguments.

Potentially Incompatible Changes
Deprecations warn by default
Over the years, Perl's developers have deprecated a number of language
features for a variety of reasons. Perl now defaults to issuing a
warning if a deprecated language feature is used. Many of the
deprecations Perl now warns you about have been deprecated for many
years. You can find a list of what was deprecated in a given release of
Perl in the "perl5xxdelta.pod" file for that release.

To disable this feature in a given lexical scope, you should use "no
warnings 'deprecated';" For information about which language features
are deprecated and explanations of various deprecation warnings, please
see perldiag.pod. See "Deprecations" below for the list of features and
modules Perl's developers have deprecated as part of this release.

Version number formats
Acceptable version number formats have been formalized into "strict" and
"lax" rules. "package NAME VERSION" takes a strict version number.
"UNIVERSAL::VERSION" and the version object constructors take lax
version numbers. Providing an invalid version will result in a fatal
error. The version argument in "use NAME VERSION" is first parsed as a
numeric literal or v-string and then passed to "UNIVERSAL::VERSION" (and
must then pass the "lax" format test).

These formats are documented fully in the 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
decimal and dotted-decimal versions may have a trailing "alpha"
component separated by an underscore character after a fractional or
dotted-decimal component.

The version module adds "version::is_strict" and "version::is_lax"
functions to check a scalar against these rules.

@INC reorganization
In @INC, "ARCHLIB" and "PRIVLIB" now occur after after the current
version's "site_perl" and "vendor_perl". Modules installed into
"site_perl" and "vendor_perl" will now be loaded in preference to those
installed in "ARCHLIB" and "PRIVLIB".

REGEXPs are now first class
Internally, Perl now treates compiled regular expressions (such as those
created with "qr//") as first class entities. Perl modules which
serialize, deserialize or otherwise have deep interaction with Perl's
internal data structures need to be updated for this change. Most
affected CPAN modules have already been updated as of this writing.

Switch statement changes
The "given"/"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 "when" now
interprets its argument as a boolean, instead of an expression to be
used in a smart match:

flip-flop operators
The ".." and "..." flip-flop operators are now evaluated in boolean
context, following their usual semantics; see "Range Operators" in
perlop.

Note that, as in perl 5.10.0, "when (1..10)" will not work to test
whether a given value is an integer between 1 and 10; you should use
"when ([1..10])" instead (note the array reference).

However, contrary to 5.10.0, evaluating the flip-flop operators in
boolean context ensures it can now be useful in a "when()", notably
for implementing bistable conditions, like in:

when (/^=begin/ .. /^=end/) {
# do something
}

defined-or operator
A compound expression involving the defined-or operator, as in "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 "when (expr1 || expr2)".)

Smart match changes
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.

Changes to type-based dispatch
The smart match operator "~~" is no longer commutative. The behaviour of
a smart match now depends primarily on the type of its right hand
argument. Moreover, its semantics have been adjusted for greater
consistency or usefulness in several cases. While the general backwards
compatibility is maintained, several changes must be noted:

* Code references with an empty prototype are no longer treated
specially. They are passed an argument like the other code
references (even if they choose to ignore it).

* "%hash ~~ sub {}" and "@array ~~ sub {}" now test that the
subroutine returns a true value for each key of the hash (or element
of the array), instead of passing the whole hash or array as a
reference to the subroutine.

* Due to the commutativity breakage, code references are no longer
treated specially when appearing on the left of the "~~" operator,
but like any vulgar scalar.

* "undef ~~ %hash" is always false (since "undef" can't be a key in a
hash). No implicit conversion to "" is done (as was the case in perl
5.10.0).

* "$scalar ~~ @array" now always distributes the smart match across
the elements of the array. It's true if one element in @array
verifies "$scalar ~~ $element". This is a generalization of the old
behaviour that tested whether the array contained the scalar.

The full dispatch table for the smart match operator is given in "Smart
matching in detail" in perlsyn.

Smart match and overloading
According to the rule of dispatch based on the rightmost argument type,
when an object overloading "~~" appears on the right side of the
operator, the overload routine will always be called (with a 3rd
argument set to a true value, see overload.) However, when the object
will appear on the left, the overload routine will be called only when
the rightmost argument is a simple scalar. This way, distributivity of
smart match across arrays is not broken, as well as the other behaviours
with complex types (coderefs, hashes, regexes). Thus, writers of
overloading routines for smart match mostly need to worry only with
comparing against a scalar, and possibly with stringification
overloading; the other common cases will be automatically handled
consistently.

"~~" will now refuse to work on objects that do not overload it (in
order to avoid relying on the object's underlying structure). (However,
if the object overloads the stringification or the numification
operators, and if overload fallback is active, it will be used instead,
as usual.)

Other potentially incompatible changes
* The definitions of a number of Unicode properties have changed to
match those of the current Unicode standard. These are listed above
under "Unicode overhaul". This change may break code that expects
the old definitions.

* The boolkeys op has moved to the group of hash ops. This breaks
binary compatibility.

* Filehandles are now always blessed into "IO::File".

The previous behaviour was to bless Filehandles into FileHandle (an
empty proxy class) if it was loaded into memory and otherwise to
bless them into "IO::Handle".

* The semantics of "use feature :5.10*" have changed slightly. See
"Modules and Pragmata" for more information.

* 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 "perl -V". See perlrepository for more information.

* As part of the "Test::Harness" 2.x to 3.x upgrade, the experimental
"Test::Harness::Straps" module has been removed. See "Modules and
Pragmata" for more details.

* As part of the "ExtUtils::MakeMaker" upgrade, the
"ExtUtils::MakeMaker::bytes" and "ExtUtils::MakeMaker::vmsish"
modules have been removed from this distribution.

* "Module::CoreList" no longer contains the %:patchlevel hash.

* "length undef" now returns undef.

* Unsupported private C API functions are now declared "static" to
prevent leakage to Perl's public API.

* To support the bootstrapping process, miniperl no longer builds with
UTF-8 support in the regexp engine.

This allows a build to complete with PERL_UNICODE set and a UTF-8
locale. Without this there's a bootstrapping problem, as miniperl
can't load the UTF-8 components of the regexp engine, because
they're not yet built.

* miniperl's @INC is now restricted to just "-I...", the split of
$ENV{PERL5LIB}, and "".""

* A space or a newline is now required after a "#line XXX" directive.

* Tied filehandles now have an additional method EOF which provides
the EOF type.

* To better match all other flow control statements, "foreach" may no
longer be used as an attribute.

* Perl's command-line switch "-P", which was deprecated in version
5.10.0, has now been removed.

Deprecations
From time to time, Perl's developers find it necessary to deprecate
features or modules we've previously shipped as part of the core
distribution. We are well aware of the pain and frustration that a
backwards-incompatible change to Perl can cause for developers building
or maintaining software in Perl. You can be sure that when we deprecate
a functionality or syntax, it isn't a choice we make lightly. Sometimes,
we choose to deprecate functionality or syntax because it was found to
be poorly designed or implemented. Sometimes, this is because they're
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 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:

suidperl
"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.

Use of ":=" to mean an empty attribute list
An accident of Perl's parser meant that these constructions were all
equivalent:

my $pi := 4;
my $pi : = 4;
my $pi : = 4;

with the ":" being treated as the start of an attribute list, which
ends before the "=". As whitespace is not significant here, all are
parsed as an empty attribute list, hence all the above are
equivalent to, and better written as

my $pi = 4;

because no attribute processing is done for an empty list.

As is, this meant that ":=" cannot be used as a new token, without
silently changing the meaning of existing code. Hence that
particular form is now deprecated, and will become a syntax error.
If it is absolutely necessary to have empty attribute lists (for
example, because of a code generator) then avoid the warning by
adding a space before the "=".

"UNIVERSAL->import()"
The method "UNIVERSAL->import()" is now deprecated. Attempting to
pass import arguments to a "use UNIVERSAL" statement will result in
a deprecation warning.

Use of "goto" to jump into a construct
Using "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.

Custom character names in \N{name} that don't look like names
In "\N{*name*}", *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 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 "\N" (See ""\N" experimental regex escape"), names that
look like curly brace -enclosed quantifiers won't work. For example,
"\N{3,4}" now means to match 3 to 4 non-newlines; before a custom
name "3,4" could have been created.

Deprecated Modules
The following modules will be removed from the core distribution in
a future release, and should be installed from CPAN instead.
Distributions on CPAN which require these should add them to their
prerequisites. The core versions of these modules warnings will
issue a deprecation warning.

If you ship a packaged version of Perl, either alone or as part of a
larger system, then you should carefully consider the reprecussions
of core module deprecations. You may want to consider shipping your
default build of Perl with packages for some or all deprecated
modules which install into "vendor" or "site" perl library
directories. This will inhibit the deprecation warnings.

Alternatively, you may want to consider patching lib/deprecate.pm to
provide deprecation warnings specific to your packaging system or
distribution of Perl, consistent with how your packaging system or
distribution manages a staged transition from a release where the
installation of a single package provides the given functionality,
to a later release where the system administrator needs to know to
install multiple packages to get that same functionality.

You can silence these deprecation warnings by installing the modules
in question from CPAN. To install the latest version of all of them,
just install "Task::Deprecations::5_12".

Class::ISA
Pod::Plainer
Shell
Switch
Switch is buggy and should be avoided. You may find Perl's new
"given"/"when" feature a suitable replacement. See "Switch
statements" in perlsyn for more information.

Assignment to $[
Use of the attribute :locked on subroutines
Use of "locked" with the attributes pragma
Use of "unique" with the attributes pragma
Perl_pmflag
"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 toke.c, and prior to 5.10,
regcomp.c. In core, it has been replaced by a static function.

Numerous Perl 4-era libraries
termcap.pl, tainted.pl, stat.pl, shellwords.pl, pwd.pl, open3.pl,
open2.pl, newgetopt.pl, look.pl, find.pl, finddepth.pl,
importenv.pl, hostname.pl, getopts.pl, getopt.pl, getcwd.pl,
flush.pl, fastcwd.pl, exceptions.pl, ctime.pl, complete.pl,
cacheout.pl, bigrat.pl, bigint.pl, bigfloat.pl, assert.pl,
abbrev.pl, dotsh.pl, and timelocal.pl are all now deprecated.
Earlier, Perl's developers intended to remove these libraries from
Perl's core for the 5.14.0 release.

During final testing before the release of 5.12.0, several
developers discovered current production code using these ancient
libraries, some inside the Perl core itself. Accordingly, the
pumpking granted them a stay of execution. They will begin to warn
about their deprecation in the 5.14.0 release and will be removed in
the 5.16.0 release.

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,
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 "=" and ":"
in writing regular expressions: "\p{property=value}" and
"\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 "\p{...}" constructs. In addition, Perl allows
underscores between digits of numbers.

Perl now accepts all the Unicode-defined synonyms for properties and
property values.

"qr/\X/", which matches a Unicode logical character, has been expanded
to work better with various Asian languages. It now is defined as an
*extended grapheme cluster*. (See
< http://www.unicode.org/reports/tr29/>;). Anything matched previously and
that made sense will continue to be accepted. Additionally:

* "\X" will not break apart a "CR LF" sequence.

* "\X" will now match a sequence which includes the "ZWJ" and "ZWNJ"
characters.

* "\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 "\X" will now
handle that case, for example at the beginning of a line, or after a
"ZWSP". And this is the part where "\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.

* "\X" will now match a (Korean) Hangul syllable sequence, and the
Thai and Lao exception cases.

Otherwise, this change should be transparent for the non-affected
languages.

"\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 "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
"Decomposition_Type=Noncanonical" (short: "dt=noncanon"). It has the
same meaning as was previously intended, namely the union of all the
non-canonical Decomposition types, with Unicode "Compat" being just one
of those.

"\p{Decomposition_Type=Canonical}" now includes the Hangul syllables.

"\p{Uppercase}" and "\p{Lowercase}" now work as the Unicode standard
says they should. This means they each match a few more characters than
they used to.

"\p{Cntrl}" now matches the same characters as "\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.

"\p{Alpha}" now matches the same characters as "\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 "\p{Alnum}" and "\p{Word}" depend on Alpha's definition
and have changed accordingly.

"\p{Word}" no longer incorrectly matches non-word characters such as
fractions.

"\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.

"\p{XDigit}" now matches the same characters as "\p{Hex_Digit}". This
means that in addition to the characters it currently matches,
"[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
"\p{In=5.0}" matches any code point whose usage has been determined *as
of* Unicode version 5.0. The "\p{Age=5.0}" only matches code points
added in *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 "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 perluniprops.

Modules and Pragmata
New Modules and Pragmata
"autodie"
"autodie" is a new lexically-scoped alternative for the "Fatal"
module. The bundled version is 2.06_01. Note that in this release,
using a string eval when "autodie" is in effect can cause the
autodie behaviour to leak into the surrounding scope. See "BUGS" in
autodie for more details.

Version 2.06_01 has been added to the Perl core.

"Compress::Raw::Bzip2"
Version 2.024 has been added to the Perl core.

"overloading"
"overloading" allows you to lexically disable or enable overloading
for some or all operations.

Version 0.001 has been added to the Perl core.

"parent"
"parent" establishes an ISA relationship with base classes at
compile time. It provides the key feature of "base" without further
unwanted behaviors.

Version 0.223 has been added to the Perl core.

"Parse::CPAN::Meta"
Version 1.40 has been added to the Perl core.

"VMS::DCLsym"
Version 1.03 has been added to the Perl core.

"VMS::Stdio"
Version 2.4 has been added to the Perl core.

"XS::APItest::KeywordRPN"
Version 0.003 has been added to the Perl core.

Updated Pragmata
"base"
Upgraded from version 2.13 to 2.15.

"bignum"
Upgraded from version 0.22 to 0.23.

"charnames"
"charnames" now contains the Unicode NameAliases.txt database file.
This has the effect of adding some extra "\N" character names that
formerly wouldn't have been recognised; for example, ""\N{LATIN
CAPITAL LETTER GHA}"".

Upgraded from version 1.06 to 1.07.

"constant"
Upgraded from version 1.13 to 1.20.

"diagnostics"
"diagnostics" now supports %.0f formatting internally.

"diagnostics" no longer suppresses "Use of uninitialized value in
range (or flip)" warnings. [perl #71204]

Upgraded from version 1.17 to 1.19.

"feature"
In "feature", the meaning of the ":5.10" and ":5.10.X" feature
bundles has changed slightly. The last component, if any (i.e. "X")
is simply ignored. This is predicated on the assumption that new
features will not, in general, be added to maintenance releases. So
":5.10" and ":5.10.X" have identical effect. This is a change to the
behaviour documented for 5.10.0.

"feature" now includes the "unicode_strings" feature:

use feature "unicode_strings";

This pragma turns on Unicode semantics for the case-changing
operations ("uc", "lc", "ucfirst", "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.

"less"
"less" now includes the "stash_name" method to allow subclasses of
"less" to pick where in %^H to store their stash.

Upgraded from version 0.02 to 0.03.

"lib"
Upgraded from version 0.5565 to 0.62.

"mro"
"mro" is now implemented as an XS extension. The documented
interface has not changed. Code relying on the implementation detail
that some "mro::" methods happened to be available at all times gets
to "keep both pieces".

Upgraded from version 1.00 to 1.02.

"overload"
"overload" now allow overloading of 'qr'.

Upgraded from version 1.06 to 1.10.

"threads"
Upgraded from version 1.67 to 1.75.

"threads::shared"
Upgraded from version 1.14 to 1.32.

"version"
"version" now has support for "Version number formats" as described
earlier in this document and in its own documentation.

Upgraded from version 0.74 to 0.82.

"warnings"
"warnings" has a new "warnings::fatal_enabled()" function. It also
includes a new "illegalproto" warning category. See also "New or
Changed Diagnostics" for this change.

Upgraded from version 1.06 to 1.09.

Updated Modules
"Archive::Extract"
Upgraded from version 0.24 to 0.38.

"Archive::Tar"
Upgraded from version 1.38 to 1.54.

"Attribute::Handlers"
Upgraded from version 0.79 to 0.87.

"AutoLoader"
Upgraded from version 5.63 to 5.70.

"B::Concise"
Upgraded from version 0.74 to 0.78.

"B::Debug"
Upgraded from version 1.05 to 1.12.

"B::Deparse"
Upgraded from version 0.83 to 0.96.

"B::Lint"
Upgraded from version 1.09 to 1.11_01.

"CGI"
Upgraded from version 3.29 to 3.48.

"Class::ISA"
Upgraded from version 0.33 to 0.36.

NOTE: "Class::ISA" is deprecated and may be removed from a future
version of Perl.

"Compress::Raw::Zlib"
Upgraded from version 2.008 to 2.024.

"CPAN"
Upgraded from version 1.9205 to 1.94_56.

"CPANPLUS"
Upgraded from version 0.84 to 0.90.

"CPANPLUS::Dist::Build"
Upgraded from version 0.06_02 to 0.46.

"Data::Dumper"
Upgraded from version 2.121_14 to 2.125.

"DB_File"
Upgraded from version 1.816_1 to 1.820.

"Devel::PPPort"
Upgraded from version 3.13 to 3.19.

"Digest"
Upgraded from version 1.15 to 1.16.

"Digest::MD5"
Upgraded from version 2.36_01 to 2.39.

"Digest::SHA"
Upgraded from version 5.45 to 5.47.

"Encode"
Upgraded from version 2.23 to 2.39.

"Exporter"
Upgraded from version 5.62 to 5.64_01.

"ExtUtils::CBuilder"
Upgraded from version 0.21 to 0.27.

"ExtUtils::Command"
Upgraded from version 1.13 to 1.16.

"ExtUtils::Constant"
Upgraded from version 0.2 to 0.22.

"ExtUtils::Install"
Upgraded from version 1.44 to 1.55.

"ExtUtils::MakeMaker"
Upgraded from version 6.42 to 6.56.

"ExtUtils::Manifest"
Upgraded from version 1.51_01 to 1.57.

"ExtUtils::ParseXS"
Upgraded from version 2.18_02 to 2.21.

"File::Fetch"
Upgraded from version 0.14 to 0.24.

"File::Path"
Upgraded from version 2.04 to 2.08_01.

"File::Temp"
Upgraded from version 0.18 to 0.22.

"Filter::Simple"
Upgraded from version 0.82 to 0.84.

"Filter::Util::Call"
Upgraded from version 1.07 to 1.08.

"Getopt::Long"
Upgraded from version 2.37 to 2.38.

"IO"
Upgraded from version 1.23_01 to 1.25_02.

"IO::Zlib"
Upgraded from version 1.07 to 1.10.

"IPC::Cmd"
Upgraded from version 0.40_1 to 0.54.

"IPC::SysV"
Upgraded from version 1.05 to 2.01.

"Locale::Maketext"
Upgraded from version 1.12 to 1.14.

"Locale::Maketext::Simple"
Upgraded from version 0.18 to 0.21.

"Log::Message"
Upgraded from version 0.01 to 0.02.

"Log::Message::Simple"
Upgraded from version 0.04 to 0.06.

"Math::BigInt"
Upgraded from version 1.88 to 1.89_01.

"Math::BigInt::FastCalc"
Upgraded from version 0.16 to 0.19.

"Math::BigRat"
Upgraded from version 0.21 to 0.24.

"Math::Complex"
Upgraded from version 1.37 to 1.56.

"Memoize"
Upgraded from version 1.01_02 to 1.01_03.

"MIME::Base64"
Upgraded from version 3.07_01 to 3.08.

"Module::Build"
Upgraded from version 0.2808_01 to 0.3603.

"Module::CoreList"
Upgraded from version 2.12 to 2.29.

"Module::Load"
Upgraded from version 0.12 to 0.16.

"Module::Load::Conditional"
Upgraded from version 0.22 to 0.34.

"Module::Loaded"
Upgraded from version 0.01 to 0.06.

"Module::Pluggable"
Upgraded from version 3.6 to 3.9.

"Net::Ping"
Upgraded from version 2.33 to 2.36.

"NEXT"
Upgraded from version 0.60_01 to 0.64.

"Object::Accessor"
Upgraded from version 0.32 to 0.36.

"Package::Constants"
Upgraded from version 0.01 to 0.02.

"PerlIO"
Upgraded from version 1.04 to 1.06.

"Pod::Parser"
Upgraded from version 1.35 to 1.37.

"Pod::Perldoc"
Upgraded from version 3.14_02 to 3.15_02.

"Pod::Plainer"
Upgraded from version 0.01 to 1.02.

NOTE: "Pod::Plainer" is deprecated and may be removed from a future
version of Perl.

"Pod::Simple"
Upgraded from version 3.05 to 3.13.

"Safe"
Upgraded from version 2.12 to 2.22.

"SelfLoader"
Upgraded from version 1.11 to 1.17.

"Storable"
Upgraded from version 2.18 to 2.22.

"Switch"
Upgraded from version 2.13 to 2.16.

NOTE: "Switch" is deprecated and may be removed from a future
version of Perl.

"Sys::Syslog"
Upgraded from version 0.22 to 0.27.

"Term::ANSIColor"
Upgraded from version 1.12 to 2.02.

"Term::UI"
Upgraded from version 0.18 to 0.20.

"Test"
Upgraded from version 1.25 to 1.25_02.

"Test::Harness"
Upgraded from version 2.64 to 3.17.

"Test::Simple"
Upgraded from version 0.72 to 0.94.

"Text::Balanced"
Upgraded from version 2.0.0 to 2.02.

"Text::ParseWords"
Upgraded from version 3.26 to 3.27.

"Text::Soundex"
Upgraded from version 3.03 to 3.03_01.

"Thread::Queue"
Upgraded from version 2.00 to 2.11.

"Thread::Semaphore"
Upgraded from version 2.01 to 2.09.

"Tie::RefHash"
Upgraded from version 1.37 to 1.38.

"Time::HiRes"
Upgraded from version 1.9711 to 1.9719.

"Time::Local"
Upgraded from version 1.18 to 1.1901_01.

"Time::Piece"
Upgraded from version 1.12 to 1.15.

"Unicode::Collate"
Upgraded from version 0.52 to 0.52_01.

"Unicode::Normalize"
Upgraded from version 1.02 to 1.03.

"Win32"
Upgraded from version 0.34 to 0.39.

"Win32API::File"
Upgraded from version 0.1001_01 to 0.1101.

"XSLoader"
Upgraded from version 0.08 to 0.10.

Removed Modules and Pragmata
"attrs"
Removed from the Perl core. Prior version was 1.02.

"CPAN::API::HOWTO"
Removed from the Perl core. Prior version was 'undef'.

"CPAN::DeferedCode"
Removed from the Perl core. Prior version was 5.50.

"CPANPLUS::inc"
Removed from the Perl core. Prior version was 'undef'.

"DCLsym"
Removed from the Perl core. Prior version was 1.03.

"ExtUtils::MakeMaker::bytes"
Removed from the Perl core. Prior version was 6.42.

"ExtUtils::MakeMaker::vmsish"
Removed from the Perl core. Prior version was 6.42.

"Stdio"
Removed from the Perl core. Prior version was 2.3.

"Test::Harness::Assert"
Removed from the Perl core. Prior version was 0.02.

"Test::Harness::Iterator"
Removed from the Perl core. Prior version was 0.02.

"Test::Harness::Point"
Removed from the Perl core. Prior version was 0.01.

"Test::Harness::Results"
Removed from the Perl core. Prior version was 0.01.

"Test::Harness::Straps"
Removed from the Perl core. Prior version was 0.26_01.

"Test::Harness::Util"
Removed from the Perl core. Prior version was 0.01.

"XSSymSet"
Removed from the Perl core. Prior version was 1.1.

Deprecated Modules and Pragmata
See "Deprecated Modules" above.

Documentation
New Documentation
* perlhaiku contains instructions on how to build perl for the Haiku
platform.

* perlmroapi describes the new interface for pluggable Method
Resolution Orders.

* 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.

* perlrepository describes how to access the perl source using the
*git* version control system.

* perlpolicy extends the "Social contract about contributed modules"
into the beginnings of a document on Perl porting policies.

Changes to Existing Documentation
* The various large 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 Changes, which just explains how that same
information may be extracted from the git version control system.

* 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
perlrepository.

* The syntax "unless (EXPR) BLOCK else BLOCK" is now documented as
valid, as is the syntax "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.

* Documented -X overloading.

* Documented that "when()" treats specially most of the filetest
operators

* Documented "when" as a syntax modifier.

* Eliminated "Old Perl threads tutorial", which described 5005
threads.

pod/perlthrtut.pod is the same material reworked for ithreads.

* Correct previous documentation: v-strings are not deprecated

With version objects, we need them to use MODULE VERSION syntax.
This patch removes the deprecation notice.

* Security contact information is now part of perlsec.

* A significant fraction of the core documentation has been updated to
clarify the behavior of Perl's Unicode handling.

Much of the remaining core documentation has been reviewed and
edited for clarity, consistent use of language, and to fix the
spelling of Tom Christiansen's name.

* The Pod specification (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 "L<"section">" has been marked as deprecated.

* if.pm has been documented in "use" in perlfunc as a means to get
conditional loading of modules despite the implicit BEGIN block
around "use".

* The documentation for $1 in perlvar.pod has been clarified.

* "\N{U+*wide hex char*}" is now documented.

Selected Performance Enhancements
* A new internal cache means that "isa()" will often be faster.

* The implementation of "C3" Method Resolution Order has been
optimised - linearisation for classes with single inheritance is 40%
faster. Performance for multiple inheritance is unchanged.

* Under "use locale", the locale-relevant information is now cached on
read-only values, such as the list returned by "keys %hash". This
makes operations such as "sort keys %hash" in the scope of "use
locale" much faster.

* Empty "DESTROY" methods are no longer called.

* "Perl_sv_utf8_upgrade()" is now faster.

* "keys" on empty hash is now faster.

* "if (%foo)" has been optimized to be faster than "if (keys %foo)".

* The string repetition operator ("$str x $num") is now several times
faster when $str has length one or $num is large.

* Reversing an array to itself (as in "@a = reverse @a") in void
context now happens in-place and is several orders of magnitude
faster than it used to be. It will also preserve non-existent
elements whenever possible, i.e. for non magical arrays or tied
arrays with "EXISTS" and "DELETE" methods.

Installation and Configuration Improvements
* perlapi, perlintern, perlmodlib and perltoc are now all generated at
build time, rather than being shipped as part of the release.

* If "vendorlib" and "vendorarch" are the same, then they are only
added to @INC once.

* $Config{usedevel} and the C-level "PERL_USE_DEVEL" are now defined
if perl is built with "-Dusedevel".

* Configure will enable use of "-fstack-protector", to provide
protection against stack-smashing attacks, if the compiler supports
it.

* Configure will now determine the correct prototypes for re-entrant
functions and for "gconvert" if you are using a C++ compiler rather
than a C compiler.

* 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 "perl -v" and "perl -V". Unpushed
local commits are automatically added to the list of local patches
displayed by "perl -V".

* Perl now supports SystemTap's "dtrace" compatibility layer and an
issue with linking "miniperl" has been fixed in the process.

* perldoc now uses "less -R" instead of "less" for improved behaviour
in the face of "groff"'s new usage of ANSI escape codes.

*
"perl -V" now reports use of the compile-time options
"USE_PERL_ATOF" and "USE_ATTRIBUTES_FOR_PERLIO".

* As part of the flattening of ext, all extensions on all platforms
are built by make_ext.pl. This replaces the Unix-specific
ext/util/make_ext, VMS-specific make_ext.com and Win32-specific
win32/buildext.pl.

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.

* 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.

* The internal structure of the dual-life modules traditionally found
in the lib/ and ext/ directories in the perl source has changed
significantly. Where possible, dual-lifed modules have been
extracted from lib/ and ext/.

Dual-lifed modules maintained by Perl's developers as part of the
Perl core now live in dist/. Dual-lifed modules maintained primarily
on CPAN now live in cpan/. When reporting a bug in a module located
under cpan/, please send your bug report directly to the module's
bug tracker or author, rather than Perl's bug tracker.

* "\N{...}" now compiles better, always forces UTF-8 internal
representation

Perl's developers have fixed several problems with the recognition
of "\N{...}" constructs. As part of this, perl will store any scalar
or regex containing "\N{*name*}" or "\N{U+*wide hex char*}" in its
definition in UTF-8 format. (This was true previously for all
occurences of "\N{*name*}" that did not use a custom translator, but
now it's always true.)

* Perl_magic_setmglob now knows about globs, fixing RT #71254.

* "SVt_RV" no longer exists. RVs are now stored in IVs.

* "Perl_vcroak()" now accepts a null first argument. In addition, a
full audit was made of the "not NULL" compiler annotations, and
those for several other internal functions were corrected.

* New macros "dSAVEDERRNO", "dSAVE_ERRNO", "SAVE_ERRNO",
"RESTORE_ERRNO" have been added to formalise the temporary saving of
the "errno" variable.

* The function "Perl_sv_insert_flags" has been added to augment
"Perl_sv_insert".

* The function "Perl_newSV_type(type)" has been added, equivalent to
"Perl_newSV()" followed by "Perl_sv_upgrade(type)".

* The function "Perl_newSVpvn_flags()" has been added, equivalent to
"Perl_newSVpvn()" and then performing the action relevant to the
flag.

Two flag bits are currently supported.

* "SVf_UTF8" will call "SvUTF8_on()" for you. (Note that this does
not convert an sequence of ISO 8859-1 characters to UTF-8). A
wrapper, "newSVpvn_utf8()" is available for this.

* "SVs_TEMP" now calls "Perl_sv_2mortal()" on the new SV.

There is also a wrapper that takes constant strings,
"newSVpvs_flags()".

* The function "Perl_croak_xs_usage" has been added as a wrapper to
"Perl_croak".

* Perl now exports the functions "PerlIO_find_layer" and
"PerlIO_list_alloc".

* "PL_na" has been exterminated from the core code, replaced by local
STRLEN temporaries, or "*_nolen()" calls. Either approach is faster
than "PL_na", which is a pointer dereference into the interpreter
structure under ithreads, and a global variable otherwise.

* "Perl_mg_free()" used to leave freed memory accessible via
"SvMAGIC()" on the scalar. It now updates the linked list to remove
each piece of magic as it is freed.

* Under ithreads, the regex in "PL_reg_curpm" is now reference
counted. This eliminates a lot of hackish workarounds to cope with
it not being reference counted.

* "Perl_mg_magical()" would sometimes incorrectly turn on
"SvRMAGICAL()". This has been fixed.

* The *public* IV and NV flags are now not set if the string value has
trailing "garbage". This behaviour is consistent with not setting
the public IV or NV flags if the value is out of range for the type.

* Uses of "Nullav", "Nullcv", "Nullhv", "Nullop", "Nullsv" etc have
been replaced by "NULL" in the core code, and non-dual-life modules,
as "NULL" is clearer to those unfamiliar with the core code.

* A macro MUTABLE_PTR(p) has been added, which on (non-pedantic) gcc
will not cast away "const", returning a "void *". Macros
"MUTABLE_SV(av)", "MUTABLE_SV(cv)" etc build on this, casting to "AV
*" etc without casting away "const". This allows proper compile-time
auditing of "const" correctness in the core, and helped picked up
some errors (now fixed).

* Macros "mPUSHs()" and "mXPUSHs()" have been added, for pushing SVs
on the stack and mortalizing them.

* Use of the private structure "mro_meta" has changed slightly.
Nothing outside the core should be accessing this directly anyway.

* A new tool, Porting/expand-macro.pl has been added, that allows you
to view how a C preprocessor macro would be expanded when compiled.
This is handy when trying to decode the macro hell that is the perl
guts.

Testing
Testing improvements
Parallel tests
The core distribution can now run its regression tests in parallel
on Unix-like platforms. Instead of running "make test", set
"TEST_JOBS" in your environment to the number of tests to run in
parallel, and run "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 TAP::Harness needs to be able to schedule individual
non-conflicting test scripts itself, and there is no standard
interface to "make" utilities to interact with their job schedulers.

Note that currently some test scripts may fail when run in parallel
(most notably "ext/IO/t/io_dir.t"). If necessary run just the
failing scripts again sequentially and see if the failures go away.

Test harness flexibility
It's now possible to override "PERL5OPT" and friends in t/TEST

Test watchdog
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 "make test" and "make
test_harness" run to completion automatically.

New Tests
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.

* Significant cleanups to core tests to ensure that language and
interpreter features are not used before they're tested.

* "make test_porting" now runs a number of important pre-commit checks
which might be of use to anyone working on the Perl core.

* t/porting/podcheck.t automatically checks the well-formedness of POD
found in all .pl, .pm and .pod files in the MANIFEST, other than in
dual-lifed modules which are primarily maintained outside the Perl
core.

* t/porting/manifest.t now tests that all files listed in MANIFEST are
present.

* t/op/while_readdir.t tests that a bare readdir in while loop sets
$_.

* t/comp/retainedlines.t checks that the debugger can retain source
lines from "eval".

* t/io/perlio_fail.t checks that bad layers fail.

* t/io/perlio_leaks.t checks that PerlIO layers are not leaking.

* t/io/perlio_open.t checks that certain special forms of open work.

* t/io/perlio.t includes general PerlIO tests.

* t/io/pvbm.t checks that there is no unexpected interaction between
the internal types "PVBM" and "PVGV".

* t/mro/package_aliases.t checks that mro works properly in the
presence of aliased packages.

* t/op/dbm.t tests "dbmopen" and "dbmclose".

* t/op/index_thr.t tests the interaction of "index" and threads.

* t/op/pat_thr.t tests the interaction of esoteric patterns and
threads.

* t/op/qr_gc.t tests that "qr" doesn't leak.

* t/op/reg_email_thr.t tests the interaction of regex recursion and
threads.

* t/op/regexp_qr_embed_thr.t tests the interaction of patterns with
embedded "qr//" and threads.

* t/op/regexp_unicode_prop.t tests Unicode properties in regular
expressions.

* t/op/regexp_unicode_prop_thr.t tests the interaction of Unicode
properties and threads.

* t/op/reg_nc_tie.t tests the tied methods of
"Tie::Hash::NamedCapture".

* t/op/reg_posixcc.t checks that POSIX character classes behave
consistently.

* t/op/re.t checks that exportable "re" functions in universal.c work.

* t/op/setpgrpstack.t checks that "setpgrp" works.

* t/op/substr_thr.t tests the interaction of "substr" and threads.

* t/op/upgrade.t checks that upgrading and assigning scalars works.

* t/uni/lex_utf8.t checks that Unicode in the lexer works.

* t/uni/tie.t checks that Unicode and "tie" work.

* t/comp/final_line_num.t tests whether line numbers are correct at
EOF

* t/comp/form_scope.t tests format scoping.

* t/comp/line_debug.t tests whether "@{"_<$file"}" works.

* t/op/filetest_t.t tests if -t file test works.

* t/op/qr.t tests "qr".

* t/op/utf8cache.t tests malfunctions of the utf8 cache.

* t/re/uniprops.t test unicodes "\p{}" regex constructs.

* 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.

* t/op/time_loop.t tests that unix times greater than "2**63", which
can now be handed to "gmtime" and "localtime", do not cause an
internal overflow or an excessively long loop.

New or Changed Diagnostics
New Diagnostics
* SV allocation tracing has been added to the diagnostics enabled by
"-Dm". The tracing can alternatively output via the "PERL_MEM_LOG"
mechanism, if that was enabled when the perl binary was compiled.

* Smartmatch resolution tracing has been added as a new diagnostic.
Use "-DM" to enable it.

* A new debugging flag "-DB" now dumps subroutine definitions, leaving
"-Dx" for its original purpose of dumping syntax trees.

* Perl 5.12 provides a number of new diagnostic messages to help you
write better code. See perldiag for details of these new messages.

* "Bad plugin affecting keyword '%s'"

* "gmtime(%.0f) too large"

* "Lexing code attempted to stuff non-Latin-1 character into
Latin-1 input"

* "Lexing code internal error (%s)"

* "localtime(%.0f) too large"

* "Overloaded dereference did not return a reference"

* "Overloaded qr did not return a REGEXP"

* "Perl_pmflag() is deprecated, and will be removed from the XS
API"

* "lvalue attribute ignored after the subroutine has been defined"

This new warning is issued when one attempts to mark a
subroutine as lvalue after it has been defined.

* Perl now warns you if "++" or "--" are unable to change the
value because it's beyond the limit of representation.

This uses a new warnings category: "imprecision".

* "lc", "uc", "lcfirst", and "ucfirst" warn when passed undef.

* "Show constant in "Useless use of a constant in void context""

* "Prototype after '%s'"

* "panic: sv_chop %s"

This new fatal error occurs when the C routine "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.

* The fatal error "Malformed UTF-8 returned by \N" is now produced
if the "charnames" handler returns malformed UTF-8.

* If an unresolved named character or sequence was encountered
when compiling a regex pattern then the fatal error "\N{NAME}
must be resolved by the lexer" is now produced. This can happen,
for example, when using a single-quotish context like "$re =
'\N{SPACE}'; /$re/;". See perldiag for more examples of how the
lexer can get bypassed.

* "Invalid hexadecimal number in \N{U+...}" is a new fatal error
triggered when the character constant represented by "..." is
not a valid hexadecimal number.

* The new meaning of "\N" as "[^\n]" is not valid in a bracketed
character class, just like "." in a character class loses its
special meaning, and will cause the fatal error "\N in a
character class must be a named character: \N{...}".

* The rules on what is legal for the "..." in "\N{...}" have been
tightened up so that unless the "..." begins with an alphabetic
character and continues with a combination of alphanumerics,
dashes, spaces, parentheses or colons then the warning
"Deprecated character(s) in \N{...} starting at '%s'" is now
issued.

* The warning "Using just the first characters returned by \N{}"
will be issued if the "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.

Changed Diagnostics
A number of existing diagnostic messages have been improved or
corrected:

* A new warning category "illegalproto" allows finer-grained control
of warnings around function prototypes.

The two warnings:

"Illegal character in prototype for %s : %s"
"Prototype after '%c' for %s : %s"

have been moved from the "syntax" top-level warnings category into a
new first-level category, "illegalproto". These two warnings are
currently the only ones emitted during parsing of an invalid/illegal
prototype, so one can now use

no warnings 'illegalproto';

to suppress only those, but not other syntax-related warnings.
Warnings where prototypes are changed, ignored, or not met are still
in the "prototype" category as before.

* "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 perl binary, setting the
C pre-processor macro "PERL_SUB_DEPTH_WARN" to the desired value.

* "Illegal character in prototype" warning is now more precise when
reporting illegal characters after _

* mro merging error messages are now very similar to those produced by
Algorithm::C3.

* Amelioration of the error message "Unrecognized character %s in
column %d"

Changes the error message to "Unrecognized character %s; marked by
<-- HERE after %s<-- HERE near column %d". This should make it a
little simpler to spot and correct the suspicious character.

* Perl now explicitly points to $. when it causes an uninitialized
warning for ranges in scalar context.

* "split" now warns when called in void context.

* "printf"-style functions called with too few arguments will now
issue the warning "Missing argument in %s" [perl #71000]

* Perl now properly returns a syntax error instead of segfaulting if
"each", "keys", or "values" is used without an argument.

* "tell()" now fails properly if called without an argument and when
no previous file was read.

"tell()" now returns -1

投稿者 xml-rpc : 2010年4月15日 11:24
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