Proposal: Move 'split' into a separate class in System.Random

[Milan Straka]

Hi,

-1 here, because
  * this can potentially break a lot of code,
  * I see no motivation why to do it,
  * and personally I find the `split' method very useful.

Cheers,
Milan

> The "split" routine in the RandomGen seems to be a sore spot for some
> people and is perceived to have few users (even as a percentage of
> RandomGen users).  I propose:
> 
> 1) Making a class "SplittableGen":
> 
> class SplittableGen g where
>   split :: g -> (g, g)
> 
> 2) (re)moving the "split" routine from the RandomGen class.
> 
> See ticket 4314 [1] for the patch.
> 
> Period of discussion: Till October 8 (3.5 weeks, ending just over 1
> week after ICFP)
> 
> Cheers,
> Thomas
> 
> [1] http://hackage.haskell.org/trac/ghc/ticket/4314
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