stop - raise a stop signal
stop -> -
Desctiption:
stop causes the execution stack to be popped until an
enclosing stopped context is found. Effectively, the
stopped/stop combination equals the catch/throw pair of
C++.
stop/stopped is used to implement SLI's error handling
capabilities.
Notes: stop, stopped is PostScript compatible.
The Red Book, sec. 3.10
/var/www/debian/nest/nest-simulator-2.20.0/sli/slicontrol.cc