[Haskell-cafe] Use of the Try typeclass

[Michael Snoyman]

Edward,

What version of the packages are you using? Can you give the output of:

ghc-pkg list|grep failure

Michael

On Thu, Dec 31, 2009 at 7:11 AM, Edward Z. Yang <ezyang at mit.edu> wrote:

> Excerpts from Alexander Dunlap's message of Thu Dec 31 00:06:58 -0500 2009:
> > Why are you importing both Control.Failure and Control.Monad.Failure
> > when the latter just re-exports the former? Are you using the latest
> > versions of the two packages? Try importing just
> > Control.Monad.Failure.MTL; that provides the MTL failure instances and
> > also re-exports Control.Failure.
>
> That's correct. I imported both when Control.Monad.Failure.MTL failed
> to expose try:
>
> ezyang at javelin:~/Dev/wizard$ ghci
> Prelude> :m +Control.Monad.Failure.MTL
> Prelude Control.Monad.Failure.MTL> :t try
>
> <interactive>:1:0: Not in scope: `try'
>
> Which, doesn't really seem like it should be the case.
>
> Cheers,
> Edward
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