reset \*- execute non-local goto
These routines are useful
discovered in a low-level subroutine
is typically called just at the start of
the main loop of a processing program.
It stores certain parameters such as the call point and the stack
is typically called after diagnosing an error
in some subprocedure called from the main loop.
it pops the stack appropriately
and generates a non-local return from
It is erroneous, and generally
has been called in a routine which is