Re: [Haskell-cafe] ATs vs FDs

On 14 August 2010 11:19, Andrew Coppin wrote:

As I understand it, ATs were invented because FDs are "evil" and must never be used ever for any purpose. However, it doesn't seem to be possible to use ATs to do the same things that FDs can do.

You might want to read the "Language and Program Design for Functional Dependencies" paper by Mark P. Jones and Iavor Diatchki. In some situations fundeps are much cleaner than type funs, and cleanliness is virtuous surely?