* QUIT ( -- ) no-return

this will throw and lead back to the outer-interpreter.
traditionally, the outer-interpreter is called QUIT
in forth itself where the first part of the QUIT-word
had been to clean the stacks (and some other variables)
and then turn to an endless loop containing >QUERY
and >EVALUATE (otherwise known as INTERPRET )
- in pfe it is defined as a THROW ,
 : QUIT -56 THROW ;

core ordinary primitive