[Haskell-cafe] ErrorT and catchError question

[Brandon S. Allbery KF8NH]

On Jan 15, 2008, at 0:28 , Adam Smyczek wrote:

> It's probably a trivial question, but I cannot figure out
> how to implement the catchError function in:
>
> instance MonadError String Shell where
> 	throwError      = error . ("Shell failed: "++)
> 	catchError l h = ???

Take a look at Control.Exception.catch for starters.

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH