( flag | flag "<spaces>name ..."
is true, do nothing. Otherwise, skipping leading
spaces, parse and discard space-delimited words from the parse
area, including nested occurrences of [IF]
, until either the word [ELSE]
or the word
has been parsed and discarded. If the parse area
becomes exhausted, it is refilled as with REFILL
is an immediate word.
An ambiguous condition exists if [IF]
d, or if the end of the input buffer is
reached and cannot be refilled before the terminating