On 01/12/12 13:03, Magicloud Magiclouds wrote: > Hi, > With Prelude.catch, I could write "catch () $ \_ -> return Nothing". > But with Control.Exception.catch, I must specify a type for the "_". > What should I do?
Use SomeException for the type, as it is the base of the exception hierarchy. (Although Haskell does not have classes in the OOP sense and therefore does not have a built-in means of expressing subtype relations, it emulates this in a somewhat awkward manner for exceptions.) Cheers, Greg _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
