[comp.lang.forth] TILE's argument binding

scowl@eecs.cs.pdx.edu (Scott W. Larson) (12/23/89)

TILE's README file mentions arguement binding and gives a
couple examples:

: 2swap { a b c d } c d a b ;
: 2drop { a b } ;

Unfortunately I get the ?? error at the first curly brace. Is
this feature in a special vocabulary or is there some other
trick to making it work?