* THROW ( n -- )

raise an exception - it will adjust the depth
of all stacks and start interpreting at the point
of the latest CATCH

if n is null nothing happens, the -1 (ie. FALSE )
is the raise-code of ABORT - the other codes
are implementation dependent and will result in
something quite like ABORT

FORTH/ANS exception (dpANS9.6.1.2275) ordinary primitive