> I hope that compilers will be able to reasonably inline it,
> eliminating
> the overhead. At least theorethically is should be possible.
>
> Unfortunately I guess that GHC does not unfold any recursion.
> Maybe it won't be hard to make it possible to add a hint:
> {-# UNFOLD 6 callIO #-}
> that the programmer politely asks to try to inline and unfold the
> recursion up to 6 times at call sites to see if it finishes?
Since the type is explicit, GHC should be able to inline away all the
overloading. In fact there's no recursion here: the recursive call to
callIO is to a method pulled out of the dictionary passed in as an argument,
and the values of the dictionaries will all be available at compile time.
This is way cool, BTW :)
Cheers,
Simon
