Proposal: Remove the bogus MonadFail instance for ST

Wed Mar 14 10:44:52 UTC 2018

+1 on removing it.

Sent from my iPhone

> On Mar 13, 2018, at 11:45 PM, David Feuer <david.feuer at 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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