Ambiguous type variable error msg

Question

I don\'t think it is a bug, but I am a bit puzzled as to why that doesn\'t work. A bonus question is why does it mention variable e? There is no variable e.

    P         


        

Answer 1

Try giving your handler the type SomeException -> IO x, where x is a concrete type, e.g.

import Control.Exception
let f _ = putStrLn "error" :: SomeException -> IO () 
in handle f undefined