You can make the env argument optional if you like, with whatever semantics you want (the current environment, a new environment, etc.)
---
Side note: why doesn't Arc 3.1 use this definition? Because eval is incredibly slow in Racket, but applying a function is fast. But I'm assuming in a language that emphasizes fexprs (like Kernel, or wart) that eval should be plenty fast.
I don't think that does what you think it does. Suppose 'map is implemented independently of 'apply, and that it takes this form:
(def map (f seq)
...
... (f elem) ...
...)
Then (map quote '(1 2 3)) should result in the list (elem elem elem). That's what my intuition says anyway, not that it's really useful behavior. :-p
Mapping [list quote _], as I was talking about when I called it ($lambda (x) (list $quote x)), will hopefully work regardless of what mapping quote does.
