[Haskell] randomgen for foreign random functions

[Jan-Willem Maessen - Sun Labs East]

Simon Peyton-Jones wrote (in response to Hal Daume):
> | basically, i want to wrap this up as something like:
> | 
> | gengam :: RandomGen g => g -> Double -> Double -> (g, Double)
> | 
> | analogously to the normal random # generation stuff.
> 
> There's a standard approach, originally due to Lennart Augustsson.
> 
> Have a single function that generates an infinite supply
> 	mkSupply :: IO Supply

Note that Simon's code is essentially isomorphic to the splittable 
supply library referenced in my last message---but the library gives a 
few more knobs you can turn.

Simon, you left out the declaration for "MkSplitUniqSupply"!

-Jan