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            <h1>perlexperiment</h1>


  <!--    -->
<ul><li><a href="#NAME">NAME</a><li><a href="#DESCRIPTION">DESCRIPTION</a><ul><li><a href="#Current-experiments">Current experiments</a><li><a href="#Accepted-features">Accepted features</a><li><a href="#Removed-features">Removed features</a></ul><li><a href="#SEE-ALSO">SEE ALSO</a><li><a href="#AUTHORS">AUTHORS</a><li><a href="#COPYRIGHT">COPYRIGHT</a><li><a href="#LICENSE">LICENSE</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>perlexperiment - A listing of experimental features in Perl</p>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>This document lists the current and past experimental features in the perl
core. Although all of these are documented with their appropriate topics,
this succinct listing gives you an overview and basic facts about their
status.</p>
<p>So far we've merely tried to find and list the experimental features and infer
their inception, versions, etc. There's a lot of speculation here.</p>
<a name="Current-experiments"></a><h2>Current experiments</h2>
<ul>
<li><a name="our-can-now-have-an-experimental-optional-attribute-unique"></a><b><code class="inline"><a class="l_k" href="functions/our.html">our</a></code> can now have an experimental optional attribute <code class="inline"><span class="w">unique</span></code>
</b>
<p>Introduced in Perl 5.8.0</p>
<p>Deprecated in Perl 5.10.0</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d119313">[perl #119313]</a>.</p>
</li>
<li><a name="Smart-match-(~~)"></a><b>Smart match (<code class="inline">~~</code>
)</b>
<p>Introduced in Perl 5.10.0</p>
<p>Modified in Perl 5.10.1, 5.12.0</p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::smartmatch</span></code>
.</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d119317">[perl #119317]</a>.</p>
</li>
<li><a name="Pluggable-keywords"></a><b>Pluggable keywords</b>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d119455">[perl #119455]</a>.</p>
<p>See <a href="perlapi.html#PL_keyword_plugin">PL_keyword_plugin in perlapi</a> for the mechanism.</p>
<p>Introduced in Perl 5.11.2</p>
</li>
<li><a name="Regular-Expression-Set-Operations"></a><b>Regular Expression Set Operations</b>
<p>Introduced in Perl 5.18</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d119451">[perl #119451]</a>.</p>
<p>See also: <a href="perlrecharclass.html#Extended-Bracketed-Character-Classes">Extended Bracketed Character Classes in perlrecharclass</a></p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::regex_sets</span></code>
.</p>
</li>
<li><a name="Subroutine-signatures"></a><b>Subroutine signatures</b>
<p>Introduced in Perl 5.20.0</p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::signatures</span></code>
.</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121481">[perl #121481]</a>.</p>
</li>
<li><a name="Aliasing-via-reference"></a><b>Aliasing via reference</b>
<p>Introduced in Perl 5.22.0</p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::refaliasing</span></code>
.</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d122947">[perl #122947]</a>.</p>
<p>See also: <a href="perlref.html#Assigning-to-References">Assigning to References in perlref</a></p>
</li>
<li><a name="The-%22const%22-attribute"></a><b>The "const" attribute</b>
<p>Introduced in Perl 5.22.0</p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::const_attr</span></code>
.</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d123630">[perl #123630]</a>.</p>
<p>See also: <a href="perlsub.html#Constant-Functions">Constant Functions in perlsub</a></p>
</li>
<li><a name="use-re-'strict'%3b"></a><b>use re 'strict';</b>
<p>Introduced in Perl 5.22.0</p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::re_strict</span></code>
.</p>
<p>See <a href="re.html#'strict'-mode">'strict' mode in re</a></p>
</li>
<li><a name="String--and-number-specific-bitwise-operators"></a><b>String- and number-specific bitwise operators</b>
<p>Introduced in Perl 5.22.0</p>
<p>See also: <a href="perlop.html#Bitwise-String-Operators">Bitwise String Operators in perlop</a></p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::bitwise</span></code>
.</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d123707">[perl #123707]</a>.</p>
</li>
<li><a name="The-%3c%3awin32%3e-IO-pseudolayer"></a><b>The &lt;:win32&gt; IO pseudolayer</b>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d119453">[perl #119453]</a>.</p>
<p>See also <a href="perlrun.html">perlrun</a></p>
</li>
<li><a name="Declaring-a-reference-to-a-variable"></a><b>Declaring a reference to a variable</b>
<p>Introduced in Perl 5.26.0</p>
<p>Using this feature triggers warnings in the category
<code class="inline"><span class="w">experimental::declared_refs</span></code>
.</p>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d128654">[perl #128654]</a>.</p>
<p>See also: <a href="perlref.html#Declaring-a-Reference-to-a-Variable">Declaring a Reference to a Variable in perlref</a></p>
</li>
<li><a name="There-is-an-installhtml-target-in-the-Makefile."></a><b>There is an <code class="inline"><span class="w">installhtml</span></code>
 target in the Makefile.</b>
<p>The ticket for this feature is
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d116487">[perl #116487]</a>.</p>
</li>
<li><a name="Unicode-in-Perl-on-EBCDIC"></a><b>Unicode in Perl on EBCDIC</b>
</li>
</ul>
<a name="Accepted-features"></a><h2>Accepted features</h2>
<p>These features were so wildly successful and played so well with others that
we decided to remove their experimental status and admit them as full, stable
features in the world of Perl, lavishing all the benefits and luxuries thereof.
They are also awarded +5 Stability and +3 Charisma.</p>
<dl>
<dt>64</dt><dd><a name="64-bit-support"></a><b>-bit support</b>
<p>Introduced in Perl 5.005</p>
</dd>
<li><a name="die-accepts-a-reference"></a><b>die accepts a reference</b>
<p>Introduced in Perl 5.005</p>
</li>
<li><a name="DB-module"></a><b>DB module</b>
<p>Introduced in Perl 5.6.0</p>
<p>See also <a href="perldebug.html">perldebug</a>, <a href="perldebtut.html">perldebtut</a></p>
</li>
<li><a name="Weak-references"></a><b>Weak references</b>
<p>Introduced in Perl 5.6.0</p>
</li>
<li><a name="Internal-file-glob"></a><b>Internal file glob</b>
<p>Introduced in Perl 5.6.0</p>
</li>
<li><a name="fork()-emulation"></a><b>fork() emulation</b>
<p>Introduced in Perl 5.6.1</p>
<p>See also <a href="perlfork.html">perlfork</a></p>
</li>
<li><a name="-Dusemultiplicity--Duseithreads"></a><b>-Dusemultiplicity -Duseithreads</b>
<p>Introduced in Perl 5.6.0</p>
<p>Accepted in Perl 5.8.0</p>
</li>
<li><a name="Support-for-long-doubles"></a><b>Support for long doubles</b>
<p>Introduced in Perl 5.6.0</p>
<p>Accepted in Perl 5.8.1</p>
</li>
<li><a name="The-%5cN-regex-character-class"></a><b>The <code class="inline">\<span class="w">N</span></code>
 regex character class</b>
<p>The <code class="inline">\<span class="w">N</span></code>
 character class, not to be confused with the named character
sequence <code class="inline">\<span class="i">N</span><span class="s">{</span><span class="w">NAME</span><span class="s">}</span></code>
, denotes any non-newline character in a regular
expression.</p>
<p>Introduced in Perl 5.12</p>
<p>Exact version of acceptance unclear, but no later than Perl 5.18.</p>
</li>
<li><a name="(%3f%7bcode%7d)-and-(%3f%3f%7b-code-%7d)"></a><b><code class="inline">(?{code})</code> and <code class="inline"><span class="s">(</span><span class="q">??</span><span class="s">{</span> <span class="w">code</span> <span class="s">}</span><span class="s">)</span></code>
</b>
<p>Introduced in Perl 5.6.0</p>
<p>Accepted in Perl 5.20.0</p>
<p>See also <a href="perlre.html">perlre</a></p>
</li>
<li><a name="Linux-abstract-Unix-domain-sockets"></a><b>Linux abstract Unix domain sockets</b>
<p>Introduced in Perl 5.9.2</p>
<p>Accepted before Perl 5.20.0.  The Socket library is now primarily maintained
on CPAN, rather than in the perl core.</p>
<p>See also <a href="Socket.html">Socket</a></p>
</li>
<li><a name="Lvalue-subroutines"></a><b>Lvalue subroutines</b>
<p>Introduced in Perl 5.6.0</p>
<p>Accepted in Perl 5.20.0</p>
<p>See also <a href="perlsub.html">perlsub</a></p>
</li>
<li><a name="Backtracking-control-verbs"></a><b>Backtracking control verbs</b>
<p><code class="inline"><span class="s">(</span><span class="i">*ACCEPT</span><span class="s">)</span></code>
</p>
<p>Introduced in Perl 5.10</p>
<p>Accepted in Perl 5.20.0</p>
</li>
<li><a name="The-%3c%3apop%3e-IO-pseudolayer"></a><b>The &lt;:pop&gt; IO pseudolayer</b>
<p>See also <a href="perlrun.html">perlrun</a></p>
<p>Accepted in Perl 5.20.0</p>
</li>
<li><a name="%5cs-in-regexp-matches-vertical-tab"></a><b><code class="inline">\s</code> in regexp matches vertical tab</b>
<p>Accepted in Perl 5.22.0</p>
</li>
<li><a name="Postfix-dereference-syntax"></a><b>Postfix dereference syntax</b>
<p>Introduced in Perl 5.20.0</p>
<p>Accepted in Perl 5.24.0</p>
</li>
<li><a name="Lexical-subroutines"></a><b>Lexical subroutines</b>
<p>Introduced in Perl 5.18.0</p>
<p>Accepted in Perl 5.26.0</p>
</li>
</dl>
<a name="Removed-features"></a><h2>Removed features</h2>
<p>These features are no longer considered experimental and their functionality
has disappeared. It's your own fault if you wrote production programs using
these features after we explicitly told you not to (see <a href="perlpolicy.html">perlpolicy</a>).</p>
<dl>
<dt>5.</dt><dd><a name="5.005-style-threading"></a><b>005-style threading</b>
<p>Introduced in Perl 5.005</p>
<p>Removed in Perl 5.10</p>
</dd>
<li><a name="perlcc"></a><b>perlcc</b>
<p>Introduced in Perl 5.005</p>
<p>Moved from Perl 5.9.0 to CPAN</p>
</li>
<li><a name="The-pseudo-hash-data-type"></a><b>The pseudo-hash data type</b>
<p>Introduced in Perl 5.6.0</p>
<p>Removed in Perl 5.9.0</p>
</li>
<li><a name="GetOpt%3a%3aLong-Options-can-now-take-multiple-values-at-once-(experimental)"></a><b>GetOpt::Long Options can now take multiple values at once (experimental)</b>
<p><code class="inline"><span class="w">Getopt::Long</span></code>
 upgraded to version 2.35</p>
<p>Removed in Perl 5.8.8</p>
</li>
<li><a name="Assertions"></a><b>Assertions</b>
<p>The <code class="inline">-A</code>
 command line switch</p>
<p>Introduced in Perl 5.9.0</p>
<p>Removed in Perl 5.9.5</p>
</li>
<li><a name="Test%3a%3aHarness%3a%3aStraps"></a><b>Test::Harness::Straps</b>
<p>Moved from Perl 5.10.1 to CPAN</p>
</li>
<li><a name="legacy"></a><b><code class="inline"><span class="w">legacy</span></code>
</b>
<p>The experimental <code class="inline"><span class="w">legacy</span></code>
 pragma was swallowed by the <code class="inline"><span class="w">feature</span></code>
 pragma.</p>
<p>Introduced in Perl 5.11.2</p>
<p>Removed in Perl 5.11.3</p>
</li>
<li><a name="Lexical-%24_"></a><b>Lexical <code class="inline"><span class="i">$_</span></code>
</b>
<p>Using this feature triggered warnings in the category
<code class="inline"><span class="w">experimental::lexical_topic</span></code>
.</p>
<p>Introduced in Perl 5.10.0</p>
<p>Removed in Perl 5.24.0</p>
</li>
<li><a name="Array-and-hash-container-functions-accept-references"></a><b>Array and hash container functions accept references</b>
<p>Using this feature triggered warnings in the category
<code class="inline"><span class="w">experimental::autoderef</span></code>
.</p>
<p>Superseded by <a href="#Postfix-dereference-syntax">Postfix dereference syntax</a>.</p>
<p>Introduced in Perl 5.14.0</p>
<p>Removed in Perl 5.24.0</p>
</li>
</dl>
<a name="SEE-ALSO"></a><h1>SEE ALSO</h1>
<p>For a complete list of features check <a href="feature.html">feature</a>.</p>
<a name="AUTHORS"></a><h1>AUTHORS</h1>
<p>brian d foy <code class="inline"><span class="q">&lt;brian.d.foy@gmail.com&gt;</span></code>
</p>
<p>S&#xe9;bastien Aperghis-Tramoni <code class="inline"><span class="q">&lt;saper@cpan.org&gt;</span></code>
</p>
<a name="COPYRIGHT"></a><h1>COPYRIGHT</h1>
<p>Copyright 2010, brian d foy <code class="inline"><span class="q">&lt;brian.d.foy@gmail.com&gt;</span></code>
</p>
<a name="LICENSE"></a><h1>LICENSE</h1>
<p>You can use and redistribute this document under the same terms as Perl
itself.</p>




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