perl-experimental

Experimental features made easy

This pragma provides an easy and convenient way to enable or disable experimental features. Every version of perl has some number of features present but considered "experimental." For much of the life of Perl 5, this was only a designation found in the documentation. Starting in Perl v5.10.0, and more aggressively in v5.18.0, experimental features were placed behind pragmata used to enable the feature and disable associated warnings. The 'experimental' pragma exists to combine the required incantations into a single interface stable across releases of perl. For every experimental feature, this should enable the feature and silence warnings for the enclosing lexical scope: use experimental 'feature-name'; To disable the feature and, if applicable, re-enable any warnings, use: no experimental 'feature-name'; The supported features, documented further below, are: array_base - allow the use of $[ to change the starting index of @array autoderef - allow push, each, keys, and other built-ins on references lexical_topic - allow the use of lexical $_ via "my $_" postderef - allow the use of postfix dereferencing expressions, including in interpolating strings refaliasing - allow aliasing via \$x = \$y regex_sets - allow extended bracketed character classes in regexps signatures - allow subroutine signatures (for named arguments) smartmatch - allow the use of ~~ switch - allow the use of ~~, given, and when