Proposal: Remove the bogus MonadFail instance for ST

[Ryan Scott]

It's worth noting that the MonadFail instance for IO [1] also simply throws
an error (by way of failIO). Are you proposing we remove this instance as
well?

Ryan S.
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[1]
http://git.haskell.org/ghc.git/blob/cb6d8589c83247ec96d5faa82df3e93f419bbfe0:/libraries/base/Control/Monad/Fail.hs#l80
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