Aye. I had come up with /noop $$! on the second post down, but any line containing $$! or $$() or $$null will work.
Good stuff to know. I consider /halt and /haltdef to be rather confusing and inconsistent, and really appreciate where the OP is coming from here. Had somebody else ask the same question in the past day, too.
Here's a question for everyone. How can I take advantage of the $halted identifier across multiple script files, if using /halt is a disaster in itself?