[Haskell-cafe] Synthetic values?

Cristiano Paris frodo at theshire.org
Wed Feb 9 21:34:57 CET 2011

On Wed, Feb 9, 2011 at 20:14, Alexey Khudyakov
<alexey.skladnoy at gmail.com> wrote:
> ...
>> instance            PRead (WRead ::: b)
>> instance PRead b => PRead (a ::: b)
>> instance             PWrite (WWrite ::: b)
>> instance PWrite b => PWrite (a ::: b)

Brilliant! I was thinking to something like this but as a replacement
of the accumulation mechanism in the Monad. I didn't think of it in
the permission checking part.

Thanks a lot. Now I need to consolidate better my code for
incorporating yours and other people contributions.



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