haskell
Add MFP (MonadFail proposal)
Straight adaption of the proposal as seen on the Trac Wiki, https://prime.haskell.org/wiki/Libraries/Proposals/MonadFail
Rendered version of this proposal: https://github.com/quchen/rfcs/blob/mfp/texts/0000-monadfail.rst
I think we may want to wait here until we know what new type system features we will include; in particular, multi-parametre type classes would enable class MonadFail f m or some such.
When this standard is finished, MonadFail will have been in GHC for quite some time. I doubt we have much room for changes here. Early adopters already introduced MonadFail instances, we don’t want to break everything for yet another change in that department again.
I think perhaps he's thinking of the isstring tweak for the either instance of monad fail that was recently proposed?
But yeah, any tweaks in that sphere should be well motivated by some experiments
On Sunday, August 21, 2016, David Luposchainsky [email protected] wrote:
When this standard is finished, MonadFail will have been in GHC for quite some time. I doubt we have much room for changes here. Early adopters already introduced MonadFail instances, we don’t want to break everything for yet another change in that department again.
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@quchen: Nonetheless, i'd prefer to wait until we know our options to choose one.