[Haskell-cafe] Cons of -XUndecidableInstances

[Gregory Collins]

On Mon, Jun 6, 2011 at 7:52 AM, Yitzchak Gale <gale at sefer.org> wrote:
> You almost never want to use UndecidableInstances
> when writing practical programs in Haskell.

Surprisingly enough, mtl uses UndecidableInstances, so almost every
practical Haskell program uses it in one way or another.

G
-- 
Gregory Collins <greg at gregorycollins.net>