gforth <cr>
.. Gforth 0.7.3, Copyright (C) 1995-2008 Free Software Foundation, Inc.
Gforth comes with ABSOLUTELY NO WARRANTY; for details type `license'
Type `bye' to exit
1.0e 2.0e 3.0e 4.0e 5.0e 6.0e 5.0e 4.0e <cr>
.. ok
f.s <cr>
.. <8> 1.000000000000E0 2.000000000000E0 3.000000000000E0 4.000000000000E0 5.000000000000E0 6.000000000000E0 5.000000000000E0 4.000000000000E0 ok
fclearstack <cr>
.. :3: Undefined word
>>>fclearstack<<<
Backtrace:
$7F1DF5F66A68 throw
$7F1DF5F7CDB0 no.extensions
$7F1DF5F66D28 interpreter-notfound1