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PERLEXPERIMENT(1) Perl Programmers Reference Guide PERLEXPERIMENT(1)
NAME
perlexperiment - A listing of experimental features in Perl
DESCRIPTION
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.
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.
Current experiments
"our" can now have an experimental optional attribute "unique"
Introduced in Perl 5.8.0
Deprecated in Perl 5.10.0
The ticket for this feature is [perl #119313]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119313>.
Smart match ("~~")
Introduced in Perl 5.10.0
Modified in Perl 5.10.1, 5.12.0
Using this feature triggers warnings in the category
"experimental::smartmatch".
The ticket for this feature is [perl #119317]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119317>.
Lexical $_
Introduced in Perl 5.10.0
Using this feature triggers warnings in the category
"experimental::lexical_topic".
The ticket for this feature is [perl #119315]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119315>.
Pluggable keywords
The ticket for this feature is [perl #119455]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119455>.
See "PL_keyword_plugin" in perlapi for the mechanism.
Introduced in: Perl 5.11.2
Array and hash container functions accept references
Introduced in Perl 5.14.0
The ticket for this feature is [perl #119437]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119437>.
Lexical subroutines
Introduced in: Perl 5.18
See also: "Lexical Subroutines" in perlsub
Using this feature triggers warnings in the category
"experimental::lexical_subs".
The ticket for this feature is [perl #120085]
<https://rt.perl.org/rt3/Ticket/Display.html?id=120085>.
Regular Expression Set Operations
Introduced in: Perl 5.18
The ticket for this feature is [perl #119451]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119451>.
See also: "Extended Bracketed Character Classes" in
perlrecharclass
Using this feature triggers warnings in the category
"experimental::regex_sets".
"\s" in regexp matches vertical tab
Introduced in Perl 5.18
Subroutine signatures
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category
"experimental::signatures".
The ticket for this feature is [perl #121481]
<https://rt.perl.org/Ticket/Display.html?id=121481>.
Postfix dereference syntax
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category
"experimental::postderef".
The ticket for this feature is [perl #120162]
<https://rt.perl.org:443/rt3/Ticket/Display.html?id=120162>.
The <:win32> IO pseudolayer
The ticket for this feature is [perl #119453]
<https://rt.perl.org/rt3/Ticket/Display.html?id=119453>.
See also perlrun
There is an "installhtml" target in the Makefile.
The ticket for this feature is [perl #116487]
<https://rt.perl.org/rt3/Ticket/Display.html?id=116487>.
Unicode in Perl on EBCDIC
Accepted features
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.
64-bit support
Introduced in Perl 5.005
die accepts a reference
Introduced in Perl 5.005
DB module
Introduced in Perl 5.6.0
See also perldebug, perldebtut
Weak references
Introduced in Perl 5.6.0
Internal file glob
Introduced in Perl 5.6.0
fork() emulation
Introduced in Perl 5.6.1
See also perlfork
-Dusemultiplicity -Duseithreads
Introduced in Perl 5.6.0
Accepted in Perl 5.8.0
Support for long doubles
Introduced in Perl 5.6.0
Accepted in Perl 5.8.1
The "\N" regex character class
The "\N" character class, not to be confused with the named
character sequence "\N{NAME}", denotes any non-newline
character in a regular expression.
Introduced in Perl 5.12
Exact version of acceptance unclear, but no later than Perl
5.18.
"(?{code})" and "(??{ code })"
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlre
Linux abstract Unix domain sockets
Introduced in Perl 5.9.2
Accepted before Perl 5.20.0. The Socket library is now
primarily maintained on CPAN, rather than in the perl core.
See also Socket
Lvalue subroutines
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlsub
Backtracking control verbs
"(*ACCEPT)"
Introduced in: Perl 5.10
Accepted in Perl 5.20.0
The <:pop> IO pseudolayer
See also perlrun
Accepted in Perl 5.20.0
Removed features
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 perlpolicy).
5.005-style threading
Introduced in Perl 5.005
Removed in Perl 5.10
perlcc Introduced in Perl 5.005
Moved from Perl 5.9.0 to CPAN
The pseudo-hash data type
Introduced in Perl 5.6.0
Removed in Perl 5.9.0
GetOpt::Long Options can now take multiple values at once
(experimental)
"Getopt::Long" upgraded to version 2.35
Removed in Perl 5.8.8
Assertions
The "-A" command line switch
Introduced in Perl 5.9.0
Removed in Perl 5.9.5
Test::Harness::Straps
Moved from Perl 5.10.1 to CPAN
"legacy"
The experimental "legacy" pragma was swallowed by the "feature"
pragma.
Introduced in: 5.11.2
Removed in: 5.11.3
SEE ALSO
For a complete list of features check feature.
AUTHORS
brian d foy "<brian.d.foy@gmail.com>"
Sebastien Aperghis-Tramoni "<saper@cpan.org>"
COPYRIGHT
Copyright 2010, brian d foy "<brian.d.foy@gmail.com>"
LICENSE
You can use and redistribute this document under the same terms as Perl
itself.
perl v5.20.2 2014-12-27 PERLEXPERIMENT(1)