[Haskell-cafe] Cons of -XUndecidableInstances

Gregory Collins greg at gregorycollins.net
Mon Jun 6 09:52:57 CEST 2011

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.

Gregory Collins <greg at gregorycollins.net>

More information about the Haskell-Cafe mailing list