Using this feature triggers warnings in the category
C<experimental::lexical_subs>.
+The ticket for this feature is
+L<[perl #120085]|https://rt.perl.org/rt3/Ticket/Display.html?id=120085>.
+
=item Regular Expression Set Operations
Introduced in: Perl 5.18
Introduced in Perl 5.18
+=item Postfix dereference syntax
+
+Introduced in Perl 5.20.0
+
+Using this feature triggers warnings in the category
+C<experimental::postderef>.
+
+The ticket for this feature is
+L<[perl #120162]|https://rt.perl.org:443/rt3/Ticket/Display.html?id=120162>.
+
=item The <:win32> IO pseudolayer
The ticket for this feature is