Edward Kmett wrote:
I sympathize. If you feel the need for those combinators, you can talk to Ross to try to get him to add them to the library.
Where/how is transformers even maintained. The github mirror at: https://github.com/ghc/packages-transformers offers no clue.
(Well, secondEitherT is already fmap, of course.)
Yes, still a little embarrased about that :).
When the ExceptT API was crafted, it pretty much tried to follow the API of the rest of transformers, and didn't really take any of the extra combinators we had in the either package into account. =/
That was unfortunate.
You might have a hard time getting the last one adopted, though, due to the dependency on exceptions taking the API into "non-standard" territory.
What is the problem here, the `Exception` constraint, the `MonadCatch` constraint or both?
Unfortunately, even if Ross adds them, I have no way to supply them in transformers-compat when used with middle versions of transformers that have ExceptT, but not those combinators, so the compatibility hack I offer will suffer a bit.
Can't be done even with CPP? Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/