Re: [Haskell-cafe] Missing mtl classes for RWST.CPS (was: Coercing newtype-wrapped monad transformers?)

On May 11, 2020, at 2:30 PM, Alexis King wrote:

...

I should probably mention that the reason I'm having to jump through these hoops with boilerplate code is that neither "mtl", nor "transformers" provide "MonadReader", "MonadWriter", "MonadState" or just "MonadRWS" instances for RWS.CPS,

The instances are already present on master (I added them) but they have not yet been released to Hackage. Remarkably, mtl seems to be without a maintainer. See https://github.com/haskell/mtl/issues/69.

Thanks! Good to know these are at least in the pipeline. Perhaps some day I'll get to trim the boilerplate down to just: "deriving instance MonadRWS". Good luck finding someone to cut the release... -- Viktor.