Fix to work with MonadFail proposal#14
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Because of the MonadFail Proposal,
failis moved fromMonadtoMonadFail. As theGetmonad is not an instance ofMonadFail, we cannot usefailfrom GHC 8.8.1 or (base 4.13.0.0).This PR fixes the issue by replacing
failwitherror.The default implementation of
failwhich was used byGetmonad waserrorWithoutStackTrace, but I chooseerrorfor simplicity.fixes #12