Re: [Haskell-cafe] derivation of mapP, a parallel, lazy map

Felipe Lessa wrote:

Have you seen parBuffer? I'd also recommend looking at its source.

I wonder if it would be possible to make a variant of parBuffer so that the following evaluates to 1:

take 1 $ parBuffer 10 r0 (1:2:3:undefined) *** Exception: Prelude.undefined

Maybe we should use a more complex intermediate structure as data ExcList a = Nil | Cons a (ExcList a) | Deferred Exception and catch the exception through some unsafe stuff? Would that be a good idea? Zun.