+=item Script runs
+
+Introduced in Perl 5.28.0
+
+Using this feature triggers warnings in the category
+C<experimental::script_run>.
+
+See also: L<perlre/Script Runs>
+
+=item Alpabetic assertions
+
+Introduced in Perl 5.28.0
+
+Using this feature triggers warnings in the category
+C<experimental::alpha_assertions>.
+
+See also: L<perlre/Extended Patterns>.
+