[Haskell-cafe] Are functional dependencies around to stay?

Andrey Sisoyev Andrejs.Sisojevs at nextmail.ru
Tue Dec 22 18:43:00 EST 2009


The referenced writings are a bit old. I wonder, what are the current plans
and decisions (or at least dominating opinions) on FD and TF. And when the
equality constraint will be ready.

Andrey


Stephen Tetley-2 wrote:
> 
> 2009/12/22 Eduard Sergeev <Eduard.Sergeev at gmail.com>:
> 
>> As was previously noted they are supposed to be replaced by type
>> families,
> 
> Hi Eduard
> 
> Currently this seems a more like a rumour than a fact - from [1] Type
> Families and Fun Deps are equivalently expressive which seems a
> worthwhile point to restate. From [2] the Haskell prime committee want
> one or the other but not both, and will resolve matters sometime in
> the future.
> 
> Best wishes
> 
> Stephen
> 
> [1]
> http://www.haskell.org/pipermail/haskell-cafe/2009-February/055890.html
> [2] http://www.haskell.org/pipermail/haskell-prime/2008-April/002434.html
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