$ ./ficl
loading CORE EXT words
loading SEARCH & SEARCH-EXT words
loading Johns-Hopkins locals
loading MARKER
loading ficl O-O extensions
loading ficl utility classes
loading ficl string class
Ficl version 4.1.0
Jan  9 2024
ok> : hw ." hello world" cr ;
ok> hw
hello world
ok> : hw ." hello world"
ok> cr
ok> ;
Error: data stack underflow
ok>