perlexperiment - A listing of experimental features in Perl
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.
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].
~~
)
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].
The ticket for this feature is [perl #119455].
See PL_keyword_plugin in perlapi for the mechanism.
Introduced in Perl 5.11.2
Introduced in Perl 5.18
The ticket for this feature is [perl #119451].
See also: Extended Bracketed Character Classes in perlrecharclass
Using this feature triggers warnings in the category
experimental::regex_sets
.
Introduced in Perl 5.20.0
Using this feature triggers warnings in the category
experimental::signatures
.
The ticket for this feature is [perl #121481].
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
experimental::refaliasing
.
The ticket for this feature is [perl #122947].
See also: Assigning to References in perlref
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
experimental::const_attr
.
The ticket for this feature is [perl #123630].
See also: Constant Functions in perlsub
Introduced in Perl 5.22.0
Using this feature triggers warnings in the category
experimental::re_strict
.
Introduced in Perl 5.22.0
See also: Bitwise String Operators in perlop
Using this feature triggers warnings in the category
experimental::bitwise
.
The ticket for this feature is [perl #123707].
The ticket for this feature is [perl #119453].
See also perlrun
Introduced in Perl 5.26.0
Using this feature triggers warnings in the category
experimental::declared_refs
.
The ticket for this feature is [perl #128654].
installhtml
target in the Makefile.
The ticket for this feature is [perl #116487].
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.
Introduced in Perl 5.005
Introduced in Perl 5.6.0
See also perldebug, perldebtut
Introduced in Perl 5.6.0
Introduced in Perl 5.6.0
Introduced in Perl 5.6.1
See also perlfork
Introduced in Perl 5.6.0
Accepted in Perl 5.8.0
Introduced in Perl 5.6.0
Accepted in Perl 5.8.1
\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
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
Introduced in Perl 5.6.0
Accepted in Perl 5.20.0
See also perlsub
(*ACCEPT)
Introduced in Perl 5.10
Accepted in Perl 5.20.0
See also perlrun
Accepted in Perl 5.20.0
\s in regexp matches vertical tab
Accepted in Perl 5.22.0
Introduced in Perl 5.20.0
Accepted in Perl 5.24.0
Introduced in Perl 5.18.0
Accepted in Perl 5.26.0
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).
Introduced in Perl 5.005
Moved from Perl 5.9.0 to CPAN
Introduced in Perl 5.6.0
Removed in Perl 5.9.0
Getopt::Long
upgraded to version 2.35
Removed in Perl 5.8.8
The -A
command line switch
Introduced in Perl 5.9.0
Removed in Perl 5.9.5
Moved from Perl 5.10.1 to CPAN
legacy
The experimental legacy
pragma was swallowed by the feature
pragma.
Introduced in Perl 5.11.2
Removed in Perl 5.11.3
$_
Using this feature triggered warnings in the category
experimental::lexical_topic
.
Introduced in Perl 5.10.0
Removed in Perl 5.24.0
Using this feature triggered warnings in the category
experimental::autoderef
.
Superseded by Postfix dereference syntax.
Introduced in Perl 5.14.0
Removed in Perl 5.24.0
For a complete list of features check feature.
brian d foy <[email protected]>
Sébastien Aperghis-Tramoni <[email protected]>
Copyright 2010, brian d foy <[email protected]>
You can use and redistribute this document under the same terms as Perl itself.