(
"<spaces>name ..." -- )
Skipping leading spaces, parse and discard space-delimited words
from the parse area, including nested occurrences of
[IF]
...
[THEN] and
[IF] ...
[ELSE]
...
[THEN], until the word
[THEN] has been
parsed and discarded. If the parse area becomes exhausted, it is
refilled as with
REFILL.
[ELSE] is an
immediate word.