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<h1>perl5219delta</h1>
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Perl 5 version 22.0 documentation
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<h1>perl5219delta</h1>
<!-- -->
<ul><li><a href="#NAME">NAME</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#Notice">Notice</a><li><a href="#Core-Enhancements">Core Enhancements</a><ul><li><a href="#qr%2f%5cb%7bgcb%7d%2f-is-now-handled-in-regular-expressions">qr/\b{gcb}/ is now handled in regular expressions</a><li><a href="#qr%2f%5cb%7bwb%7d%2f-is-now-handled-in-regular-expressions">qr/\b{wb}/ is now handled in regular expressions</a><li><a href="#qr%2f%5cb%7bsb%7d%2f-is-now-handled-in-regular-expressions">qr/\b{sb}/ is now handled in regular expressions</a><li><a href="#New-bitwise-operators">New bitwise operators</a><li><a href="#no-re-covers-more-and-is-lexical">no re covers more and is lexical</a></ul><li><a href="#Incompatible-Changes">Incompatible Changes</a><li><a href="#Modules-and-Pragmata">Modules and Pragmata</a><ul><li><a href="#Updated-Modules-and-Pragmata">Updated Modules and Pragmata</a></ul><li><a href="#Documentation">Documentation</a><ul><li><a href="#New-Documentation">New Documentation</a><li><a href="#Changes-to-Existing-Documentation">Changes to Existing Documentation</a></ul><li><a href="#Diagnostics">Diagnostics</a><ul><li><a href="#New-Diagnostics">New Diagnostics</a><li><a href="#Changes-to-Existing-Diagnostics">Changes to Existing Diagnostics</a></ul><li><a href="#Utility-Changes">Utility Changes</a><ul><li><a href="#the-h2ph-manpage">the h2ph manpage</a><li><a href="#the-encguess-manpage">the encguess manpage</a></ul><li><a href="#Configuration-and-Compilation">Configuration and Compilation</a><li><a href="#Testing">Testing</a><li><a href="#Deprecations">Deprecations</a><ul><li><a href="#Support-for-new-warnings-categories-outside-of-%22all%22">Support for new warnings categories outside of "all"</a></ul><li><a href="#Platform-Support">Platform Support</a><ul><li><a href="#Platform-Specific-Notes">Platform-Specific Notes</a></ul><li><a href="#Selected-Bug-Fixes">Selected Bug Fixes</a><li><a href="#Acknowledgements">Acknowledgements</a><li><a href="#Reporting-Bugs">Reporting Bugs</a><li><a href="#SEE-ALSO">SEE ALSO</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>perl5219delta - what is new for perl v5.21.9</p>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>This document describes differences between the 5.21.8 release and the 5.21.9
release.</p>
<p>If you are upgrading from an earlier release such as 5.21.7, first read
<a href="perl5218delta.html">perl5218delta</a>, which describes differences between 5.21.7 and 5.21.8.</p>
<a name="Notice"></a><h1>Notice</h1>
<p>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.</p>
<a name="Core-Enhancements"></a><h1>Core Enhancements</h1>
<a name="qr%2f%5cb%7bgcb%7d%2f-is-now-handled-in-regular-expressions"></a><h2>qr/\b{gcb}/ is now handled in regular expressions</h2>
<p><code class="inline"><span class="w">gcb</span></code>
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 <code class="inline">\<span class="w">X</span></code>
regular escape
sequence. Now, there is an alternative way of handling these. See
<a href="perlrebackslash.html#%5cb%7b%7d%2c-%5cb%2c-%5cB%7b%7d%2c-%5cB">\b{}, \b, \B{}, \B in perlrebackslash</a> for details.</p>
<a name="qr%2f%5cb%7bwb%7d%2f-is-now-handled-in-regular-expressions"></a><h2>qr/\b{wb}/ is now handled in regular expressions</h2>
<p><code class="inline"><span class="w">wb</span></code>
stands for Word Boundary. It is a Unicode property
that finds the boundary between words. This is similar to the plain
<code class="inline">\<span class="w">b</span></code>
(without braces) but is more suitable for natural language
processing. It knows, for example that apostrophes can occur in the
middle of words. See <a href="perlrebackslash.html#%5cb%7b%7d%2c-%5cb%2c-%5cB%7b%7d%2c-%5cB">\b{}, \b, \B{}, \B in perlrebackslash</a> for details.</p>
<a name="qr%2f%5cb%7bsb%7d%2f-is-now-handled-in-regular-expressions"></a><h2>qr/\b{sb}/ is now handled in regular expressions</h2>
<p><code class="inline"><span class="w">sb</span></code>
stands for Sentence Boundary. It is a Unicode property
to aid in parsing natural language sentences.
See <a href="perlrebackslash.html#%5cb%7b%7d%2c-%5cb%2c-%5cB%7b%7d%2c-%5cB">\b{}, \b, \B{}, \B in perlrebackslash</a> for details.</p>
<a name="New-bitwise-operators"></a><h2>New bitwise operators</h2>
<p>A new experimental facility has been added that makes the four standard
bitwise operators (<code class="inline"><span class="i">& |</span> ^ ~</code>
) treat their operands consistently as
numbers, and introduces four new dotted operators (<code class="inline"><span class="i">&.</span> |. ^. ~.</code>
) that
treat their operands consistently as strings. The same applies to the
assignment variants (<code class="inline">&= |= ^= <span class="i">&.</span>= |.= ^.=</code>
).</p>
<p>To use this, enable the "bitwise" feature and disable the
"experimental::bitwise" warnings category. See <a href="perlop.html#Bitwise-String-Operators">Bitwise String Operators in perlop</a> for details. [rt.perl.org #123466]</p>
<a name="no-re-covers-more-and-is-lexical"></a><h2><code class="inline"><a class="l_k" href="functions/no.html">no</a> <span class="w">re</span></code>
covers more and is lexical</h2>
<p>Previously running <code class="inline"><a class="l_k" href="functions/no.html">no</a> <span class="w">re</span></code>
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.</p>
<a name="Incompatible-Changes"></a><h1>Incompatible Changes</h1>
<p>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 <a href="#Reporting-Bugs">Reporting Bugs</a> below.</p>
<a name="Modules-and-Pragmata"></a><h1>Modules and Pragmata</h1>
<a name="Updated-Modules-and-Pragmata"></a><h2>Updated Modules and Pragmata</h2>
<ul>
<li>
<p><a href="attributes.html">attributes</a> has been upgraded from version 0.25 to 0.26.</p>
</li>
<li>
<p><a href="B.html">B</a> has been upgraded from version 1.55 to 1.56.</p>
</li>
<li>
<p><a href="B/Debug.html">B::Debug</a> has been upgraded from version 1.22 to 1.23.</p>
</li>
<li>
<p><a href="B/Deparse.html">B::Deparse</a> has been upgraded from version 1.32 to 1.33.</p>
<ul>
<li>
<p>Deparse now provides a defined state sub in inner subs.</p>
</li>
<li>
<p>Since version Perl 5.21.6, Deparse would croak on special constants, but
this has now been fixed.</p>
</li>
</ul>
</li>
<li>
<p><a href="Benchmark.html">Benchmark</a> has been upgraded from version 1.19 to 1.20.</p>
</li>
<li>
<p><a href="bigint.html">bigint</a>, <a href="bignum.html">bignum</a>, <a href="bigrat.html">bigrat</a> have been upgraded to version 0.39.</p>
<p>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]</p>
</li>
<li>
<p><a href="bignum.html">bignum</a> has been upgraded from version 0.38 to 0.39.</p>
</li>
<li>
<p><a href="Carp.html">Carp</a> has been upgraded from version 1.34 to 1.35.</p>
<ul>
<li>
<p>Carp now handles non-ASCII platforms better.</p>
</li>
<li>
<p>Off-by-one error fix for Perl < 5.14.</p>
</li>
</ul>
</li>
<li>
<p><a href="Config/Perl/V.html">Config::Perl::V</a> has been upgraded from version 0.22 to 0.23.</p>
</li>
<li>
<p><a href="constant.html">constant</a> has been upgraded from version 1.32 to 1.33.</p>
</li>
<li>
<p><a href="CPAN/Meta/Requirements.html">CPAN::Meta::Requirements</a> has been upgraded from version 2.131 to 2.132</p>
</li>
<li>
<p><a href="Data/Dumper.html">Data::Dumper</a> has been upgraded from version 2.156 to 2.157.</p>
</li>
<li>
<p><a href="Devel/Peek.html">Devel::Peek</a> has been upgraded from version 1.21 to 1.22.</p>
</li>
<li>
<p><a href="DynaLoader.html">DynaLoader</a> has been upgraded from version 1.30 to 1.31.</p>
</li>
<li>
<p><a href="Encode.html">Encode</a> has been upgraded from version 2.67 to 2.70.</p>
<p>Building in C++ mode on Windows now works.</p>
</li>
<li>
<p><a href="encoding.html">encoding</a> has been upgraded from version 2.12 to 2.13.</p>
</li>
<li>
<p><a href="Errno.html">Errno</a> has been upgraded from version 1.22 to 1.23.</p>
<p>Add <code class="inline">-<span class="w">P</span></code>
to the preprocessor command-line on GCC 5. GCC added extra
line directives, breaking parsing of error code definitions. [rt.perl.org
#123784]</p>
</li>
<li>
<p><a href="ExtUtils/Miniperl.html">ExtUtils::Miniperl</a> has been upgraded from version 1.03 to 1.04.</p>
</li>
<li>
<p><a href="feature.html">feature</a> has been upgraded from version 1.39 to 1.40.</p>
</li>
<li>
<p><a href="HTTP/Tiny.html">HTTP::Tiny</a> has been upgraded from version 0.053 to 0.054.</p>
</li>
<li>
<p><a href="Opcode.html">Opcode</a> has been upgraded from version 1.31 to 1.32.</p>
</li>
<li>
<p><a href="overload.html">overload</a> has been upgraded from version 1.24 to 1.25.</p>
</li>
<li>
<p><a href="Perl/OSType.html">Perl::OSType</a> has been upgraded from version 1.007 to 1.008.</p>
</li>
<li>
<p><a href="perlfaq.html">perlfaq</a> has been upgraded from version 5.0150046 to 5.021009.</p>
</li>
<li>
<p><a href="PerlIO/scalar.html">PerlIO::scalar</a> has been upgraded from version 0.21 to 0.22.</p>
<p>Attempting to write at file positions impossible for the platform now
fail early rather than wrapping at 4GB.</p>
</li>
<li>
<p><a href="Pod/Parser.html">Pod::Parser</a> has been upgraded from version 1.62 to 1.63.</p>
</li>
<li>
<p><a href="Pod/Perldoc.html">Pod::Perldoc</a> has been upgraded from version 3.24 to 3.25.</p>
</li>
<li>
<p><a href="POSIX.html">POSIX</a> has been upgraded from version 1.49 to 1.51.</p>
</li>
<li>
<p><a href="re.html">re</a> has been upgraded from version 0.30 to 0.31.</p>
</li>
<li>
<p><a href="Socket.html">Socket</a> has been upgraded from version 2.016 to 2.018.</p>
</li>
<li>
<p><a href="Storable.html">Storable</a> has been upgraded from version 2.52 to 2.53.</p>
</li>
<li>
<p><a href="Test/Simple.html">Test::Simple</a> has been upgraded from version 1.301001_097 to 1.301001_098.</p>
</li>
<li>
<p><a href="threads/shared.html">threads::shared</a> has been upgraded from version 1.47 to 1.48.</p>
</li>
<li>
<p><a href="Unicode/Collate.html">Unicode::Collate</a> has been upgraded from version 1.10 to 1.11.</p>
</li>
<li>
<p><a href="Unicode/UCD.html">Unicode::UCD</a> has been upgraded from version 0.59 to 0.61.</p>
<ul>
<li>
<p>A new function <a href="Unicode/UCD.html#prop_values()">property_values()</a>
has been added to return a given property's possible values.</p>
</li>
<li>
<p>A new function <a href="Unicode/UCD.html#charprop()">charprop()</a>
has been added to return the value of a given property for a given code
point.</p>
</li>
<li>
<p>A new function <a href="Unicode/UCD.html#charprops_all()">charprops_all()</a>
has been added to return the values of all Unicode properties for a
given code point.</p>
</li>
<li>
<p>A bug has been fixed so that <a href="Unicode/UCD.html#prop_aliases()">propaliases()</a>
returns the correct short and long names for the Perl extensions where
it was incorrect.</p>
</li>
<li>
<p>A bug has been fixed so that
<a href="Unicode/UCD.html#prop_value_aliases()">prop_value_aliases()</a>
returns <code class="inline"><a class="l_k" href="functions/undef.html">undef</a></code> instead of a wrong result for properties that are Perl
extensions.</p>
</li>
<li>
<p>This module now works on EBCDIC platforms.</p>
</li>
</ul>
</li>
<li>
<p><a href="http://search.cpan.org/perldoc/VMS::Stdio">VMS::Stdio</a> has been upgraded from version 2.4 to 2.41.</p>
</li>
<li>
<p><a href="warnings.html">warnings</a> has been upgraded from version 1.30 to 1.31.</p>
</li>
<li>
<p><a href="http://search.cpan.org/perldoc/Win32">Win32</a> has been upgraded from version 0.49 to 0.51.</p>
<p>GetOSName() now supports Windows 8.1, and building in C++ mode now works.</p>
</li>
<li>
<p><a href="http://search.cpan.org/perldoc/Win32API::File">Win32API::File</a> has been upgraded from version 0.1201 to 0.1202</p>
<p>Building in C++ mode now works.</p>
</li>
</ul>
<a name="Documentation"></a><h1>Documentation</h1>
<a name="New-Documentation"></a><h2>New Documentation</h2>
<a name="the-perlrebackslash-manpage"></a><h3><a href="perlrebackslash.html">perlrebackslash</a></h3>
<ul>
<li>
<p>Added documentation of <code class="inline">\<span class="i">b</span><span class="s">{</span><span class="w">sb</span><span class="s">}</span></code>
, <code class="inline">\<span class="i">b</span><span class="s">{</span><span class="w">wb</span><span class="s">}</span></code>
, <code class="inline">\<span class="i">b</span><span class="s">{</span><span class="w">gcb</span><span class="s">}</span></code>
, and <code class="inline">\<span class="i">b</span><span class="s">{</span><span class="w">g</span><span class="s">}</span></code>
.</p>
</li>
</ul>
<a name="the-perlrequick-manpage"></a><h3><a href="perlrequick.html">perlrequick</a></h3>
<ul>
<li>
<p>Added example for <code class="inline">\<span class="i">b</span><span class="s">{</span><span class="w">wb</span><span class="s">}</span></code>
.</p>
</li>
</ul>
<a name="the-perlretut-manpage"></a><h3><a href="perlretut.html">perlretut</a></h3>
<ul>
<li>
<p>Added example for <code class="inline">\<span class="i">b</span><span class="s">{</span><span class="w">wb</span><span class="s">}</span></code>
.</p>
</li>
</ul>
<a name="Changes-to-Existing-Documentation"></a><h2>Changes to Existing Documentation</h2>
<a name="the-perlunicode-manpage"></a><h3><a href="perlunicode.html">perlunicode</a></h3>
<ul>
<li>
<p>Update <b>Default Word Boundaries</b> under
<a href="perlunicode.html#Unicode-Regular-Expression-Support-Level">Unicode Regular Expression Support Level in perlunicode</a>'s
<b>Extended Unicode Support</b>.</p>
</li>
</ul>
<a name="the-perlunicook-manpage"></a><h3><a href="perlunicook.html">perlunicook</a></h3>
<ul>
<li>
<p>Clarify that autodie >= 2.26 works with <code class="inline"><a class="l_k" href="functions/use.html">use</a> <a class="l_k" href="functions/open.html">open</a></code>
.</p>
</li>
<li>
<p>Correct warning message for <code class="inline"><a class="l_k" href="functions/use.html">use</a> <span class="w">autodie</span></code>
and <code class="inline"><a class="l_k" href="functions/use.html">use</a> <a class="l_k" href="functions/open.html">open</a></code>
.</p>
</li>
</ul>
<a name="the-perlfaq-manpage"></a><h3><a href="perlfaq.html">perlfaq</a></h3>
<ul>
<li>
<p><a href="perlfaq.html">perlfaq</a> has been synchronized with version 5.021009 from CPAN.</p>
</li>
</ul>
<a name="the-perlop-manpage"></a><h3><a href="perlop.html">perlop</a></h3>
<ul>
<li>
<p>Correct the version number which removes <code class="inline"><a class="l_k" href="functions/m.html">m?PATTERN?</a></code>. It was Perl 5.22.0.</p>
</li>
</ul>
<a name="the-perlvar-manpage"></a><h3><a href="perlvar.html">perlvar</a></h3>
<ul>
<li>
<p>Further clarify version number representations and usage.</p>
</li>
</ul>
<a name="the-perlmodstyle-manpage"></a><h3><a href="perlmodstyle.html">perlmodstyle</a></h3>
<ul>
<li>
<p>Instead of pointing to the module list, we are now pointing to
<a href="http://search.cpan.org/perldoc/http:#%2fprepan.org%2f">PrePAN</a>.</p>
</li>
</ul>
<a name="Diagnostics"></a><h1>Diagnostics</h1>
<p>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 <a href="perldiag.html">perldiag</a>.</p>
<a name="New-Diagnostics"></a><h2>New Diagnostics</h2>
<a name="New-Warnings"></a><h3>New Warnings</h3>
<ul>
<li>
<p><a href="perldiag.html#'%25s'-is-an-unknown-bound-type-in-regex%3b-marked-by-%3c---HERE-in-m%2f%25s%2f">'%s' is an unknown bound type in regex</a></p>
<p>You used <code class="inline">\<span class="i">b</span><span class="s">{</span>...<span class="s">}</span></code>
or <code class="inline">\<span class="i">B</span><span class="s">{</span>...<span class="s">}</span></code>
and the <code class="inline">...</code>
is not known to
Perl. The current valid ones are given in
<a href="perlrebackslash.html#%5cb%7b%7d%2c-%5cb%2c-%5cB%7b%7d%2c-%5cB">\b{}, \b, \B{}, \B in perlrebackslash</a>.</p>
</li>
<li>
<p><a href="perldiag.html#Use-of-%5cb%7b%7d-for-non-UTF-8-locale-is-wrong.-Assuming-a-UTF-8-locale">Use of \b{} for non-UTF-8 locale is wrong. Assuming a UTF-8 locale</a></p>
<p>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.</p>
</li>
<li>
<p><a href="perldiag.html#Using-%2fu-for-'%25s'-instead-of-%2f%25s-in-regex%3b-marked-by-%3c---HERE-in-m%2f%25s%2f">Using /u for '%s' instead of /%s in regex; marked by <-- HERE in m/%s/</a></p>
<p>You used a Unicode boundary (<code class="inline">\<span class="i">b</span><span class="s">{</span>...<span class="s">}</span></code>
or <code class="inline">\<span class="i">B</span><span class="s">{</span>...<span class="s">}</span></code>
) in a
portion of a regular expression where the character set modifiers <code class="inline"><span class="q">/a</span></code>
or <code class="inline"><span class="q">/aa</span></code>
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.</p>
</li>
<li>
<p><a href="perldiag.html#The-bitwise-feature-is-experimental">The bitwise feature is experimental</a></p>
<p>This warning is emitted if you use bitwise
operators (<code class="inline"><span class="i">& |</span> ^ ~ <span class="i">&.</span> |. ^. ~.</code>
) 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:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/no.html">no</a> <span class="w">warnings</span> <span class="q">"experimental::bitwise"</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">feature</span> <span class="q">"bitwise"</span><span class="sc">;</span></li><li> <span class="i">$x</span> |.= <span class="i">$y</span><span class="sc">;</span></li></ol></pre></li>
</ul>
<a name="Changes-to-Existing-Diagnostics"></a><h2>Changes to Existing Diagnostics</h2>
<ul>
<li>
<p><b>Unusual use of %s in void context</b> has been removed. It might
come back in a future release.</p>
</li>
<li>
<p><a href="perldiag.html#Argument-%22%25s%22-isn't-numeric%25s">Argument %s isn't numeric%s</a>
now adds the following note:</p>
<pre class="verbatim"><ol><li> <span class="w">Note</span> <span class="w">that</span> <a class="l_k" href="functions/for.html">for</a> <span class="w">the</span> <span class="w">C</span><span class="q"><Inf></span> <a class="l_k" href="functions/and.html">and</a> <span class="w">C</span><span class="q"><NaN></span> <span class="s">(</span><span class="w">infinity</span> <a class="l_k" href="functions/and.html">and</a> <a class="l_k" href="functions/not.html">not</a>-<span class="w">a</span>-<span class="w">number</span><span class="s">)</span> <span class="w">the</span></li><li> <span class="w">definition</span> <span class="w">of</span> <span class="q">"numeric"</span> <span class="w">is</span> <span class="w">somewhat</span> <span class="w">unusual</span><span class="co">:</span> <span class="w">the</span> <span class="w">strings</span> <span class="i">themselves</span></li><li> <span class="s">(</span><span class="w">like</span> <span class="q">"Inf"</span><span class="s">)</span> <span class="w">are</span> <span class="w">considered</span> <span class="w">numeric</span><span class="cm">,</span> <a class="l_k" href="functions/and.html">and</a> <span class="w">anything</span> <span class="w">following</span> <span class="w">them</span> <span class="w">is</span></li><li> <span class="w">considered</span> <span class="w">non</span>-<span class="w">numeric</span>.</li></ol></pre></li>
<li>
<p><b>Possible precedence problem on bitwise %c operator</b> reworded as
<a href="perldiag.html#Possible-precedence-problem-on-bitwise-%25s-operator">Possible precedence problem on bitwise %s operator</a>.</p>
</li>
</ul>
<a name="Utility-Changes"></a><h1>Utility Changes</h1>
<a name="the-h2ph-manpage"></a><h2><a href="h2ph.html">h2ph</a></h2>
<ul>
<li>
<p><i>h2ph</i> now handles hexadecimal constants in the compiler's predefined
macro definitions, as visible in <code class="inline"><span class="i">$Config</span>{<span class="w">cppsymbols</span>}</code>
. [rt.perl.org
#123784]</p>
</li>
</ul>
<a name="the-encguess-manpage"></a><h2><a href="encguess.html">encguess</a></h2>
<ul>
<li>
<p>No longer depends on non-core module anymore.</p>
</li>
</ul>
<a name="Configuration-and-Compilation"></a><h1>Configuration and Compilation</h1>
<ul>
<li>
<p><i>Configure</i> now checks for <i>lrintl</i>, <i>lroundl</i>, <i>llrintl</i>, and <i>llroundl</i>.</p>
</li>
</ul>
<a name="Testing"></a><h1>Testing</h1>
<ul>
<li>
<p>Added <i>t/op/dump.t</i> for testing <code class="inline"><a class="l_k" href="functions/dump.html">dump</a></code>.</p>
</li>
</ul>
<a name="Deprecations"></a><h1>Deprecations</h1>
<a name="Support-for-new-warnings-categories-outside-of-%22all%22"></a><h2>Support for new warnings categories outside of "all"</h2>
<p>The new option for warnings outside the <b>all</b> category in the <a href="warnings.html">warnings</a>
pragma has been removed for now.</p>
<p>For more context, you can refer to the following
<a href="http://search.cpan.org/perldoc/http:#%2fwww.nntp.perl.org%2fgroup%2fperl.perl5.porters%2f2015%2f01%2fmsg225066.html">discussion thread</a>.</p>
<a name="Platform-Support"></a><h1>Platform Support</h1>
<a name="Platform-Specific-Notes"></a><h2>Platform-Specific Notes</h2>
<a name="Win32"></a><h3>Win32</h3>
<ul>
<li>
<p>Perl can now be built in C++ mode on Windows by setting the makefile macro
<code class="inline"><span class="w">USE_CPLUSPLUS</span></code>
to the value "define".</p>
</li>
<li>
<p>List form pipe open no longer falls back to the shell.</p>
</li>
<li>
<p>In release 5.21.8 compiling on VC with dmake was broken. Fixed.</p>
</li>
<li>
<p>New <code class="inline"><span class="w">DebugSymbols</span></code>
and <code class="inline"><span class="w">DebugFull</span></code>
configuration options added to
Windows makefiles.</p>
</li>
<li>
<p><a href="B.html">B</a> now compiles again on Windows.</p>
</li>
</ul>
<a name="Solaris"></a><h3>Solaris</h3>
<p>Look for the Sun Studio compiler in both <i>/opt/solstudio*</i> and
<i>/opt/solarisstudio*</i>.</p>
<a name="VMS"></a><h3>VMS</h3>
<ul>
<li>
<p>When spawning a subprocess without waiting, the return value is now
the correct PID.</p>
</li>
<li>
<p>Fix a prototype so linking doesn't fail under the VMS C++ compiler.</p>
</li>
</ul>
<a name="Selected-Bug-Fixes"></a><h1>Selected Bug Fixes</h1>
<ul>
<li>
<p>Patterns starting with <code class="inline"><span class="q">/.*/</span></code>
are now fast again. [rt.perl.org #123743]</p>
</li>
<li>
<p>The original visible value of <code class="inline"><span class="i">$/</span></code>
is now preserved when it is set to
an invalid value. Previously if you set <code class="inline"><span class="i">$/</span></code>
to a reference to an
array, for example, perl would produce a runtime error and not set
<code class="inline"><span class="w">PL_rs</span></code>
, but perl code that checked <code class="inline"><span class="i">$/</span></code>
would see the array
reference. [rt.perl.org #123218]</p>
</li>
<li>
<p>In a regular expression pattern, a POSIX class, like <code class="inline"><span class="s">[</span><span class="co">:</span><span class="w">ascii</span><span class="co">:</span><span class="s">]</span></code>
, must
be inside a bracketed character class, like <code class="inline"><span class="q">/qr[[:ascii:]]</span></code>
. 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: <code class="inline"><span class="s">[</span><span class="co">:</span>^<span class="w">ascii</span><span class="co">:</span><span class="s">]</span></code>
. This is now fixed.</p>
</li>
<li>
<p>Fix a couple of other size calculation overflows. [rt.perl.org #123554]</p>
</li>
<li>
<p>A bug introduced in 5.21.6, <code class="inline"><a class="l_k" href="functions/dump.html">dump</a> <span class="w">LABEL</span></code>
acted the same as <code class="inline"><a class="l_k" href="functions/goto.html">goto</a>
<span class="j">LABEL</span></code>
. This has been fixed. [rt.perl.org #123836]</p>
</li>
<li>
<p>Perl 5.14.0 introduced a bug whereby <code class="inline"><a class="l_k" href="functions/eval.html">eval</a> <span class="s">{</span> <span class="j">LABEL:</span> <span class="s">}</span></code>
would crash. This
has been fixed. [rt.perl.org #123652]</p>
</li>
<li>
<p>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]</p>
</li>
<li>
<p>Code like <code class="inline"><span class="q">/$a[/</span></code>
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]</p>
</li>
<li>
<p>Fix argument underflow for <code class="inline"><a class="l_k" href="functions/pack.html">pack</a></code>. [rt.perl.org #123874]</p>
</li>
<li>
<p>Fix handling of non-strict <code class="inline">\<span class="w">x</span><span class="s">{</span><span class="s">}</span></code>
. Now <code class="inline">\<span class="w">x</span><span class="s">{</span><span class="s">}</span></code>
is equivalent to <code class="inline">\<span class="i">x</span><span class="s">{</span><span class="n">0</span><span class="s">}</span></code>
instead of faulting.</p>
</li>
<li>
<p><code class="inline"><a class="l_k" href="functions/stat.html">stat</a> -t</code>
is now no longer treated as stackable, just like <code class="inline">-t <a class="l_k" href="functions/stat.html">stat</a></code>
.
[rt.perl.org #123816]</p>
</li>
<li>
<p>The following no longer causes a SEGV: <code class="inline"><a class="l_k" href="functions/qr.html">qr{x+(y(?0))*}</a></code>.</p>
</li>
<li>
<p>Fixed infinite loop in parsing backrefs in regexp patterns.</p>
</li>
<li>
<p>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.</p>
</li>
<li>
<p>Only stringy classnames are now shared. This fixes some failures in <a href="http://search.cpan.org/perldoc/autobox">autobox</a>. [rt.cpan.org #100819]</p>
</li>
</ul>
<a name="Acknowledgements"></a><h1>Acknowledgements</h1>
<p>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.</p>
<p>Excluding auto-generated files, documentation and release tools, there were
approximately 160,000 lines of changes to 270 .pm, .t, .c and .h files.</p>
<p>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:</p>
<p>Chad Granum, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari
Mannsåker, 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
Písař, Randy Stauner, Ricardo Signes, Sawyer X, Shlomi Fish, Sisyphus, Steve
Hay, Tony Cook, Yves Orton, Ævar Arnfjörð Bjarmason.</p>
<p>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.</p>
<p>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.</p>
<p>For a more complete list of all of Perl's historical contributors, please see
the <i>AUTHORS</i> file in the Perl source distribution.</p>
<a name="Reporting-Bugs"></a><h1>Reporting Bugs</h1>
<p>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
<a href="http://www.perl.org/">http://www.perl.org/</a> , the Perl Home Page.</p>
<p>If you believe you have an unreported bug, please run the <a href="perlbug.html">perlbug</a> 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 <code class="inline"><span class="w">perl</span> -<span class="w">V</span></code>
,
will be sent off to perlbug@perl.org to be analysed by the Perl porting team.</p>
<p>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.</p>
<a name="SEE-ALSO"></a><h1>SEE ALSO</h1>
<p>The <i>Changes</i> file for an explanation of how to view exhaustive details on
what changed.</p>
<p>The <i>INSTALL</i> file for how to build Perl.</p>
<p>The <i>README</i> file for general stuff.</p>
<p>The <i>Artistic</i> and <i>Copying</i> files for copyright information.</p>
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<ul><li><a href="#NAME">NAME</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#Notice">Notice</a><li><a href="#Core-Enhancements">Core Enhancements</a><ul><li><a href="#qr%2f%5cb%7bgcb%7d%2f-is-now-handled-in-regular-expressions">qr/\b{gcb}/ is now handled in regular expressions</a><li><a href="#qr%2f%5cb%7bwb%7d%2f-is-now-handled-in-regular-expressions">qr/\b{wb}/ is now handled in regular expressions</a><li><a href="#qr%2f%5cb%7bsb%7d%2f-is-now-handled-in-regular-expressions">qr/\b{sb}/ is now handled in regular expressions</a><li><a href="#New-bitwise-operators">New bitwise operators</a><li><a href="#no-re-covers-more-and-is-lexical">no re covers more and is lexical</a></ul><li><a href="#Incompatible-Changes">Incompatible Changes</a><li><a href="#Modules-and-Pragmata">Modules and Pragmata</a><ul><li><a href="#Updated-Modules-and-Pragmata">Updated Modules and Pragmata</a></ul><li><a href="#Documentation">Documentation</a><ul><li><a href="#New-Documentation">New Documentation</a><li><a href="#Changes-to-Existing-Documentation">Changes to Existing Documentation</a></ul><li><a href="#Diagnostics">Diagnostics</a><ul><li><a href="#New-Diagnostics">New Diagnostics</a><li><a href="#Changes-to-Existing-Diagnostics">Changes to Existing Diagnostics</a></ul><li><a href="#Utility-Changes">Utility Changes</a><ul><li><a href="#the-h2ph-manpage">the h2ph manpage</a><li><a href="#the-encguess-manpage">the encguess manpage</a></ul><li><a href="#Configuration-and-Compilation">Configuration and Compilation</a><li><a href="#Testing">Testing</a><li><a href="#Deprecations">Deprecations</a><ul><li><a href="#Support-for-new-warnings-categories-outside-of-%22all%22">Support for new warnings categories outside of "all"</a></ul><li><a href="#Platform-Support">Platform Support</a><ul><li><a href="#Platform-Specific-Notes">Platform-Specific Notes</a></ul><li><a href="#Selected-Bug-Fixes">Selected Bug Fixes</a><li><a href="#Acknowledgements">Acknowledgements</a><li><a href="#Reporting-Bugs">Reporting Bugs</a><li><a href="#SEE-ALSO">SEE ALSO</a></ul>
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