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Type
0 0 !
here execute
' catch >body 20 erase abort
' (quit) >body 20 erase
The last two examples are guaranteed to destroy parts of Gforth (and
most other systems), so you better leave Gforth afterwards (if it has
not finished by itself). On some systems you may have to kill gforth
from outside (e.g., in Unix with kill).
Now that you know how to produce crashes (and that there's not much to them), let's learn how to produce meaningful programs.