[Haskell-cafe] ANN: has-0.4 Entity based records

[adam vogt]

On Tue, May 4, 2010 at 12:18 PM, HASHIMOTO, Yusaku <nonowarn at gmail.com> wrote:
> This library is inspired by HList[2], and interfaces are stealed from
> data-accessors[3]. And lenses[4], fclabels[5], and records[6] devote
> themselves to similar purposes.
>
> [2]: http://hackage.haskell.org/package/HList
> [3]: http://hackage.haskell.org/package/data-accessor
> [4]: http://hackage.haskell.org/package/lenses
> [5]: http://hackage.haskell.org/package/fclabels
> [6]: http://hackage.haskell.org/package/records
>
> Enjoy!
>
> -nwn

Which niche does `has' fit between extensible (and more complicated)
records like HList and records vs the libraries that provide only
accessors?

It would be nice to have some summary of the features of each, ex.
lenses, fclabels and data-accessor do not permit record extension
(which has seems to do).

--
Adam