That's what I mean. Functions can't mutate anything, period- the assignment operator won't even parse, and calls to procedures are forbidden. But they can still

That's what I mean. Functions can't mutate anything, period- the assignment operator won't even parse, and calls to procedures are forbidden. But they can still close over state that is mutable one other contexts The full implications of allowing this in closures have yet to be explored and I still need to make sure they won't break the guarantees I'm wanting to offer