I think I'd rather have e.g. [mapcar list '(a b c) [count-from 10]] or so. They look great in examples, but once you're doing [mapcar list '(a b c) x

I think I'd rather have e.g. [mapcar list '(a b c) [count-from 10]] or so. They look great in examples, but once you're doing [mapcar list '(a b c) x] then I still suspect that you'll confuse yourself every so often by passing the wrong x. OTOH if you've got the entire codebase in your head that isn't really an issue; it's coming back to tweak something a few months later where I usually find such features give me an unexpectedly ventilated foot :)