C<__WARN__> hooks, as described in L<perlvar> and L<perlfunc/warn>.
See also L<perldiag> and L<perltrap>. A fine-grained warning
facility is also available if you want to manipulate entire classes
-of warnings; see L<warnings> or L<perllexwarn>.
+of warnings; see L<warnings>.
=item B<-W>
X<-W>
Enables all warnings regardless of C<no warnings> or C<$^W>.
-See L<perllexwarn>.
+See L<warnings>.
=item B<-X>
X<-X>
Disables all warnings regardless of C<use warnings> or C<$^W>.
-See L<perllexwarn>.
+See L<warnings>.
=item B<-x>
X<-x>
code. By manually setting a seed, this protection may be partially or
completely lost.
-See L<perlsec/"Algorithmic Complexity Attacks"> and L</PERL_PERTURB_KEYS>
+See L<perlsec/"Algorithmic Complexity Attacks">, L</PERL_PERTURB_KEYS>, and
L</PERL_HASH_SEED_DEBUG> for more information.
=item PERL_PERTURB_KEYS