Fix call in map

[Azer0s]

This doesn't work, yet it should.

(def func (fn x (/ x 2)))
(map (.. 0 10) (fn x (' x (func x))))

I'd tap into doCall and make the call to the native map implementation myself to debug this. Probably something with context not set correctly.

[Azer0s]

Alright...this happened because the parameter for map is also called func. At the time of calling, func from map is shadowed and assigned to (fn x (' x (func x))) which is recursive. This is intended behaviour. I would fix this by prefixing stdlib parameters with _.