PERL5219DELTA(1) Perl Programmers Reference Guide PERL5219DELTA(1)NAMEperl5219delta - what is new for perl v5.21.9
DESCRIPTION
This document describes differences between the 5.21.8 release and the
5.21.9 release.
If you are upgrading from an earlier release such as 5.21.7, first read
perl5218delta, which describes differences between 5.21.7 and 5.21.8.
Notice
With this release we are now in the user-visible changes portion of the
code freeze as we prepare for the next stable release of Perl 5.
Core Enhancements
qr/\b{gcb}/ is now handled in regular expressions
"gcb" stands for Grapheme Cluster Boundary. It is a Unicode property
that finds the boundary between sequences of characters that look like
a single character to a native speaker of a language. Perl has long
had the ability to deal with these through the "\X" regular escape
sequence. Now, there is an alternative way of handling these. See
"\b{}, \b, \B{}, \B" in perlrebackslash for details.
qr/\b{wb}/ is now handled in regular expressions
"wb" stands for Word Boundary. It is a Unicode property that finds the
boundary between words. This is similar to the plain "\b" (without
braces) but is more suitable for natural language processing. It
knows, for example that apostrophes can occur in the middle of words.
See "\b{}, \b, \B{}, \B" in perlrebackslash for details.
qr/\b{sb}/ is now handled in regular expressions
"sb" stands for Sentence Boundary. It is a Unicode property to aid in
parsing natural language sentences. See "\b{}, \b, \B{}, \B" in
perlrebackslash for details.
New bitwise operators
A new experimental facility has been added that makes the four standard
bitwise operators ("& | ^ ~") treat their operands consistently as
numbers, and introduces four new dotted operators ("&. |. ^. ~.") that
treat their operands consistently as strings. The same applies to the
assignment variants ("&= |= ^= &.= |.= ^.=").
To use this, enable the "bitwise" feature and disable the
"experimental::bitwise" warnings category. See "Bitwise String
Operators" in perlop for details. [rt.perl.org #123466]
"no re" covers more and is lexical
Previously running "no re" would only turn off a few things. Now it
turns off all the enabled things. For example, previously, you couldn't
turn off debugging, once enabled, inside the same block.
Incompatible Changes
There are no changes intentionally incompatible with 5.21.8. If any
exist, they are bugs, and we request that you submit a report. See
"Reporting Bugs" below.
Modules and Pragmata
Updated Modules and Pragmata
· attributes has been upgraded from version 0.25 to 0.26.
· B has been upgraded from version 1.55 to 1.56.
· B::Debug has been upgraded from version 1.22 to 1.23.
· B::Deparse has been upgraded from version 1.32 to 1.33.
· Deparse now provides a defined state sub in inner subs.
· Since version Perl 5.21.6, Deparse would croak on special
constants, but this has now been fixed.
· Benchmark has been upgraded from version 1.19 to 1.20.
· bigint, bignum, bigrat have been upgraded to version 0.39.
Document in CAVEATS that using strings as numbers won't always
invoke the big number overloading, and how to invoke it.
[rt.perl.org #123064]
· bignum has been upgraded from version 0.38 to 0.39.
· Carp has been upgraded from version 1.34 to 1.35.
· Carp now handles non-ASCII platforms better.
· Off-by-one error fix for Perl < 5.14.
· Config::Perl::V has been upgraded from version 0.22 to 0.23.
· constant has been upgraded from version 1.32 to 1.33.
· CPAN::Meta::Requirements has been upgraded from version 2.131 to
2.132
· Data::Dumper has been upgraded from version 2.156 to 2.157.
· Devel::Peek has been upgraded from version 1.21 to 1.22.
· DynaLoader has been upgraded from version 1.30 to 1.31.
· Encode has been upgraded from version 2.67 to 2.70.
Building in C++ mode on Windows now works.
· encoding has been upgraded from version 2.12 to 2.13.
· Errno has been upgraded from version 1.22 to 1.23.
Add "-P" to the preprocessor command-line on GCC 5. GCC added
extra line directives, breaking parsing of error code definitions.
[rt.perl.org #123784]
· ExtUtils::Miniperl has been upgraded from version 1.03 to 1.04.
· feature has been upgraded from version 1.39 to 1.40.
· HTTP::Tiny has been upgraded from version 0.053 to 0.054.
· Opcode has been upgraded from version 1.31 to 1.32.
· overload has been upgraded from version 1.24 to 1.25.
· Perl::OSType has been upgraded from version 1.007 to 1.008.
· perlfaq has been upgraded from version 5.0150046 to 5.021009.
· PerlIO::scalar has been upgraded from version 0.21 to 0.22.
Attempting to write at file positions impossible for the platform
now fail early rather than wrapping at 4GB.
· Pod::Parser has been upgraded from version 1.62 to 1.63.
· Pod::Perldoc has been upgraded from version 3.24 to 3.25.
· POSIX has been upgraded from version 1.49 to 1.51.
· re has been upgraded from version 0.30 to 0.31.
· Socket has been upgraded from version 2.016 to 2.018.
· Storable has been upgraded from version 2.52 to 2.53.
· Test::Simple has been upgraded from version 1.301001_097 to
1.301001_098.
· threads::shared has been upgraded from version 1.47 to 1.48.
· Unicode::Collate has been upgraded from version 1.10 to 1.11.
· Unicode::UCD has been upgraded from version 0.59 to 0.61.
· A new function property_values() has been added to return a
given property's possible values.
· A new function charprop() has been added to return the value of
a given property for a given code point.
· A new function charprops_all() has been added to return the
values of all Unicode properties for a given code point.
· A bug has been fixed so that propaliases() returns the correct
short and long names for the Perl extensions where it was
incorrect.
· A bug has been fixed so that prop_value_aliases() returns
"undef" instead of a wrong result for properties that are Perl
extensions.
· This module now works on EBCDIC platforms.
· VMS::Stdio has been upgraded from version 2.4 to 2.41.
· warnings has been upgraded from version 1.30 to 1.31.
· Win32 has been upgraded from version 0.49 to 0.51.
GetOSName() now supports Windows 8.1, and building in C++ mode now
works.
· Win32API::File has been upgraded from version 0.1201 to 0.1202
Building in C++ mode now works.
Documentation
New Documentation
perlrebackslash
· Added documentation of "\b{sb}", "\b{wb}", "\b{gcb}", and "\b{g}".
perlrequick
· Added example for "\b{wb}".
perlretut
· Added example for "\b{wb}".
Changes to Existing Documentation
perlunicode
· Update Default Word Boundaries under "Unicode Regular Expression
Support Level" in perlunicode's Extended Unicode Support.
perlunicook
· Clarify that autodie >= 2.26 works with "use open".
· Correct warning message for "use autodie" and "use open".
perlfaq
· perlfaq has been synchronized with version 5.021009 from CPAN.
perlop
· Correct the version number which removes "m?PATTERN?". It was Perl
5.22.0.
perlvar
· Further clarify version number representations and usage.
perlmodstyle
· Instead of pointing to the module list, we are now pointing to
PrePAN <http://prepan.org/>.
Diagnostics
The following additions or changes have been made to diagnostic output,
including warnings and fatal error messages. For the complete list of
diagnostic messages, see perldiag.
New Diagnostics
New Warnings
· '%s' is an unknown bound type in regex
You used "\b{...}" or "\B{...}" and the "..." is not known to Perl.
The current valid ones are given in "\b{}, \b, \B{}, \B" in
perlrebackslash.
· Use of \b{} for non-UTF-8 locale is wrong. Assuming a UTF-8 locale
You are matching a regular expression using locale rules, and a
Unicode boundary is being matched, but the locale is not a Unicode
one. This doesn't make sense. Perl will continue, assuming a
Unicode (UTF-8) locale, but the results could well be wrong except
if the locale happens to be ISO-8859-1 (Latin1) where this message
is spurious and can be ignored.
· Using /u for '%s' instead of /%s in regex; marked by <-- HERE in
m/%s/
You used a Unicode boundary ("\b{...}" or "\B{...}") in a portion
of a regular expression where the character set modifiers "/a" or
"/aa" are in effect. These two modifiers indicate an ASCII
interpretation, and this doesn't make sense for a Unicode
definition. The generated regular expression will compile so that
the boundary uses all of Unicode. No other portion of the regular
expression is affected.
· The bitwise feature is experimental
This warning is emitted if you use bitwise operators ("& | ^ ~ &.
|. ^. ~.") with the "bitwise" feature enabled. Simply suppress the
warning if you want to use the feature, but know that in doing so
you are taking the risk of using an experimental feature which may
change or be removed in a future Perl version:
no warnings "experimental::bitwise";
use feature "bitwise";
$x |.= $y;
Changes to Existing Diagnostics
· Unusual use of %s in void context has been removed. It might come
back in a future release.
· Argument "%s" isn't numeric%s now adds the following note:
Note that for the C<Inf> and C<NaN> (infinity and not-a-number) the
definition of "numeric" is somewhat unusual: the strings themselves
(like "Inf") are considered numeric, and anything following them is
considered non-numeric.
· Possible precedence problem on bitwise %c operator reworded as
Possible precedence problem on bitwise %s operator.
Utility Changes
h2ph
· h2ph now handles hexadecimal constants in the compiler's predefined
macro definitions, as visible in $Config{cppsymbols}. [rt.perl.org
#123784]
encguess
· No longer depends on non-core module anymore.
Configuration and Compilation
· Configure now checks for lrintl, lroundl, llrintl, and llroundl.
Testing
· Added t/op/dump.t for testing "dump".
Deprecations
Support for new warnings categories outside of "all"
The new option for warnings outside the all category in the warnings
pragma has been removed for now.
For more context, you can refer to the following discussion thread
<http://www.nntp.perl.org/group/perl.perl5.porters/2015/01/msg225066.html>.
Platform Support
Platform-Specific Notes
Win32
· Perl can now be built in C++ mode on Windows by setting the
makefile macro "USE_CPLUSPLUS" to the value "define".
· List form pipe open no longer falls back to the shell.
· In release 5.21.8 compiling on VC with dmake was broken. Fixed.
· New "DebugSymbols" and "DebugFull" configuration options added to
Windows makefiles.
· B now compiles again on Windows.
Solaris
Look for the Sun Studio compiler in both /opt/solstudio* and
/opt/solarisstudio*.
VMS
· When spawning a subprocess without waiting, the return value is now
the correct PID.
· Fix a prototype so linking doesn't fail under the VMS C++ compiler.
Selected Bug Fixes
· Patterns starting with "/.*/" are now fast again. [rt.perl.org
#123743]
· The original visible value of $/ is now preserved when it is set to
an invalid value. Previously if you set $/ to a reference to an
array, for example, perl would produce a runtime error and not set
"PL_rs", but perl code that checked $/ would see the array
reference. [rt.perl.org #123218]
· In a regular expression pattern, a POSIX class, like "[:ascii:]",
must be inside a bracketed character class, like "/qr[[:ascii:]]".
A warning is issued when something looking like a POSIX class is
not inside a bracketed class. That warning wasn't getting
generated when the POSIX class was negated: "[:^ascii:]". This is
now fixed.
· Fix a couple of other size calculation overflows. [rt.perl.org
#123554]
· A bug introduced in 5.21.6, "dump LABEL" acted the same as "goto
LABEL". This has been fixed. [rt.perl.org #123836]
· Perl 5.14.0 introduced a bug whereby "eval { LABEL: }" would crash.
This has been fixed. [rt.perl.org #123652]
· Various crashes due to the parser getting confused by syntax errors
have been fixed. [rt.perl.org #123617] [rt.perl.org #123737]
[rt.perl.org #123753] [rt.perl.org #123677]
· Code like "/$a[/" used to read the next line of input and treat it
as though it came immediately after the opening bracket. Some
invalid code consequently would parse and run, but some code caused
crashes, so this is now disallowed. [rt.perl.org #123712]
· Fix argument underflow for "pack". [rt.perl.org #123874]
· Fix handling of non-strict "\x{}". Now "\x{}" is equivalent to
"\x{0}" instead of faulting.
· "stat -t" is now no longer treated as stackable, just like "-t
stat". [rt.perl.org #123816]
· The following no longer causes a SEGV: "qr{x+(y(?0))*}".
· Fixed infinite loop in parsing backrefs in regexp patterns.
· Several minor bug fixes in behavior of Inf and NaN, including
warnings when stringifying Inf-like or NaN-like strings. For
example, "NaNcy" doesn't numify to NaN anymore.
· Only stringy classnames are now shared. This fixes some failures in
autobox. [rt.cpan.org #100819]
Acknowledgements
Perl 5.21.9 represents approximately 4 weeks of development since Perl
5.21.8 and contains approximately 170,000 lines of changes across 520
files from 32 authors.
Excluding auto-generated files, documentation and release tools, there
were approximately 160,000 lines of changes to 270 .pm, .t, .c and .h
files.
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 5.21.9:
Chad Granum, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari
Mannsaaker, Daniel Dragan, David Golden, David Mitchell, Father
Chrysostomos, H.Merijn Brand, Hugo van der Sanden, James E Keenan,
James Raspass, Jarkko Hietaniemi, Karen Etheridge, Karl Williamson,
Kent Fredric, Lajos Veres, Leon Timmermans, Lukas Mai, Mathieu Arnold,
Matthew Horsfall, Peter Martini, Petr PisaX, Randy Stauner, Ricardo
Signes, Sawyer X, Shlomi Fish, Sisyphus, Steve Hay, Tony Cook, Yves
Orton, AEvar Arnfjoer` Bjarmason.
The list above is almost certainly incomplete as it is automatically
generated from version control history. In particular, it does not
include the names of the (very much appreciated) contributors who
reported issues to the Perl bug tracker.
Many of the changes included in this version originated in the CPAN
modules included in Perl's core. We're grateful to the entire CPAN
community for helping Perl to flourish.
For a more complete list of all of Perl's historical contributors,
please see the AUTHORS file in the Perl source distribution.
Reporting Bugs
If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl bug
database at https://rt.perl.org/ . There may also be information at
http://www.perl.org/ , the Perl Home Page.
If you believe you have an unreported bug, please run the 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 output
of "perl -V", will be sent off to perlbug@perl.org to be analysed by
the Perl porting team.
If the bug you are reporting has security implications, which make it
inappropriate to send to a publicly archived mailing list, then please
send it to perl5-security-report@perl.org. This points to a closed
subscription unarchived mailing list, which includes all the core
committers, who will be able to help assess the impact of issues,
figure out a resolution, and help co-ordinate the release of patches to
mitigate or fix the problem across all platforms on which Perl is
supported. Please only use this address for security issues in the
Perl core, not for modules independently distributed on CPAN.
SEE ALSO
The Changes file for an explanation of how to view exhaustive details
on what changed.
The INSTALL file for how to build Perl.
The README file for general stuff.
The Artistic and Copying files for copyright information.
perl v5.22.0 2015-05-13 PERL5219DELTA(1)
