( Drop RSP until I-2 == INTERPRET. )
: EXIT!
['] INTERPRET ( I )
BEGIN ( I )
DUP ( I I )
R> DROP I 2- @ ( I I a )
= UNTIL
DROP
;
: (ok) SPC ." ok" NL ;
: (uflw) ABORT" stack underflow" ;
: (wnf) (print) SPC ABORT" word not found" ;