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Rename

=encoding utf-8

=head1 NAME

perlexperiment - A listing of experimental features in Perl

=head1 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.

=head2 Current experiments

=over 8

=item Smart match (C<~~>)

Introduced in Perl 5.10.0

Modified in Perl 5.10.1, 5.12.0

Deprecated in 5.38.0

Will be removed in 5.42.0

Using this feature triggers warnings in the category
C<deprecated>.

The ticket for this experiment is
L<[perl #13173]|https://github.com/Perl/perl5/issues/13173>.

=item Pluggable keywords

Introduced in Perl 5.11.2

See L<perlapi/PL_keyword_plugin> for the mechanism.

The ticket for this experiment is
L<[perl #13199]|https://github.com/Perl/perl5/issues/13199>.

=item Aliasing via reference

Introduced in Perl 5.22.0

Using this feature triggers warnings in the category
C<experimental::refaliasing>.

The ticket for this experiment is
L<[perl #14150]|https://github.com/Perl/perl5/issues/14150>.

See also: L<perlref/Assigning to References>

=item use re 'strict';

Introduced in Perl 5.22.0

Using this feature triggers warnings in the category
C<experimental::re_strict>.

The ticket for this experiment is
L<[perl #18755]|https://github.com/Perl/perl5/issues/18755>

See L<re/'strict' mode>

=item Declaring a reference to a variable

Introduced in Perl 5.26.0

Using this feature triggers warnings in the category
C<experimental::declared_refs>.

The ticket for this experiment is
L<[perl #15458]|https://github.com/Perl/perl5/issues/15458>.

See also: L<perlref/Declaring a Reference to a Variable>

=item There is an C<installhtml> target in the Makefile.

The ticket for this experiment is
L<[perl #12726]|https://github.com/Perl/perl5/issues/12726>.

=item (Limited) Variable-length look-behind

Introduced in Perl 5.30.0.

Variability of up to 255 characters is handled.

Using this feature triggers warnings in the category
C<experimental::vlb>.

The ticket for this experiment is
L<[perl #18756]|https://github.com/Perl/perl5/issues/18756>.

See also: L<perlre/(*positive_lookbehind:I<pattern>)> and
L<perlre/(*negative_lookbehind:I<pattern>)>

=item Unicode private use character hooks

Introduced in Perl 5.30.0.

This feature is part of an interface intended for internal and experimental
use by the perl5 developers.  You are unlikely to encounter it in the wild.

Using this feature triggers warnings in the category
C<experimental::private_use>.

The ticket for this experiment is
L<[perl #18758]|https://github.com/Perl/perl5/issues/18758>.

=item Unicode property wildcards

Introduced in Perl 5.30.0.

This feature allows regular expression matching against Unicode character
properties to be expressed more concisely.

Using this feature triggers warnings in the category
C<experimental::uniprop_wildcards>.

The ticket for this experiment is
L<[perl #18759]|https://github.com/Perl/perl5/issues/18759>.

=item try/catch control structure

Introduced in Perl 5.34.0.

Using the optional C<finally> block part of this feature triggers warnings in
the category C<experimental::try>.

The ticket for this experiment is
L<[perl #18760]|https://github.com/Perl/perl5/issues/18760>

=item Use of C<@_> within subroutine signatures

Introduced in Perl 5.36.0 as part of a reduction in the scope of experimental
subroutine signatures.

Using the default arguments array (C<@_>) within a subroutine that uses
signatures will emit a warning in the category
C<experimental::args_array_with_signatures>. This includes C<@_> directly,
elements of it such as C<$_[$index]>, or situations where the default
arguments array is accessed implicitly such as C<shift> or C<pop> without
arguments.

=item The builtin namespace

Introduced in Perl 5.36.0.

Using certain functions of this feature triggers warnings in the category
C<experimental::builtin>.

In Perl 5.36.0, a new namespace, C<builtin>, was created for new core functions
that will not be present in every namespace, but will be available for
importing.  The namespace itself was considered experimental until Perl 5.39.2.
Some specific functions within it remain experimental.

The ticket for this experiment is
L<[perl #19764]|https://github.com/Perl/perl5/issues/19764>.

=item The defer block modifier

Introduced in Perl 5.36.0

Using this feature triggers warnings in the category C<experimental::defer>.

This feature adds a new kind of block, a C<defer> block, which will not be
executed until the containing block is being exited.

The ticket for this experiment is
L<[perl #17949]|https://github.com/Perl/perl5/issues/17949>.

=item Extra paired delimiters for quote-like operators

Introduced in Perl 5.36.0

Using this feature triggers warnings in the category
C<experimental::extra_paired_delimiters>.

This feature allows for many non-ASCII pairs of mirroring delimiters, for
example:

my @array = qw« tinker tailor soldier spy »;

The ticket for this experiment is
L<[perl #19765]|https://github.com/Perl/perl5/issues/19765>.

=back

=head2 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.

=over 8

=item 64-bit support

Introduced in Perl 5.005

=item die accepts a reference

Introduced in Perl 5.005

=item DB module

Introduced in Perl 5.6.0