from perldoc use

use VERSION also lexically enables all features available in the requested version as defined by the feature pragma, disabling any features not in the requested version's feature bundle. See feature . Similarly, if the specified Perl version is greater than or equal to 5.12.0, strictures are enabled lexically as with use strict . Any explicit use of use strict or no strict overrides use VERSION , even if it comes before it. Later use of use VERSION will override all behavior of a previous use VERSION , possibly removing the strict and feature added by use VERSION . use VERSION does not load the feature.pm or strict.pm files.

In perldoc feature each "feature" is listed with the minimal version.

Like

The say feature

use feature say tells the compiler to enable the Perl 6 style say function.

See say for details.

This feature is available starting with Perl 5.10.

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Wikisyntax for the Monastery

In reply to Re: Which pragmas are activated with a specific perl version? by LanX
in thread Which pragmas are activated with a specific perl version? by adhrain

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.