[Haskell] Re: [Haskell-cafe] ANN: cmonad 0.1.1

[Don Stewart]

Nested constructed product returns? Or constructed sums?

lennart:
> Well, yes and no.  GHC actually does a decent job when given very
> imperative code with references and mutable arrays.
> Now the type I use to wrap the references to get type safe l-values
> and r-values makes it tricker, and ghc lacks a crucial optimization
> for specialization of constructor returns.
> With that in place I think the code could be quite performant.