+1, this seems like a good move to me.

On Wed, Mar 14, 2018 at 5:45 AM, David Feuer <david.feuer@gmail.com> wrote:
I just noted that ST is an instance of MonadFail, with fail throwing
an error. This seems utterly contrary to the purpose of MonadFail! Can
we please remove this instance?

David Feuer
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