These options affect which handler will be used for subsequently
installed signals.
-=over
+=over 4
=item B<stack-trace>
B<sigtrap> has two built-in lists of signals to trap. They are:
-=over
+=over 4
=item B<normal-signals>
=head2 OTHER
+=over 4
+
=item B<untrapped>
This token tells B<sigtrap> only to install handlers for subsequently