2018-10-25 02:43:43 UTC
instance IsString str => MonadFail (Either str) where
fail = Left . fromString
In 2016 there was some discussion, and my reading is that there was consensus in favor at the time:
libaries mailing list: https://mail.haskell.org/pipermail/libraries/2016-August/027248.html
Does anyone know of a later decision not to add it, or was it simply no one's top priority?
What is the next step to move this proposal forward? Is more discussion in order? Should I just submit a patch?