[Haskell-cafe] Most Important GHC extensions to learn/use?
illissius at gmail.com
Fri Jun 1 12:11:18 CEST 2012
On Fri, Jun 1, 2012 at 6:29 AM, wren ng thornton <wren at freegeek.org> wrote:
> TypeFamilies (aka TFs)
> These are really nifty and they're all the rage these days. In
> a formal sense they're equivalent to fundeps, but in practice
> they're weaker than fundeps.
Is that still true? The reason used to be that we didn't have
superclass equalities, but we do have them now since 7.2. The only
drawbacks I know of relative to FDs are that it's sometimes more
typing, not supported by GeneralizedNewtypeDeriving, and doesn't allow
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