ersatz fails to build on GHC 8.6 because it enables MonadFailDesugaring by default, and there is no MonadFail constraint to support a failable pattern match on a list in Ersatz.BitChar. But this pattern match is a bit silly anyways, since we know statically that this list is always non-empty, so we can avoid this pattern match entirely.
ersatzfails to build on GHC 8.6 because it enablesMonadFailDesugaringby default, and there is noMonadFailconstraint to support a failable pattern match on a list inErsatz.BitChar. But this pattern match is a bit silly anyways, since we know statically that this list is always non-empty, so we can avoid this pattern match entirely.Addresses one bullet point of ekmett/lens#815.