Re: Issues with new Control.Exception

On Wed, Jan 28, 2009 at 4:00 PM, John Goerzen wrote:

* Catch doesn't work in many common cases anymore. In particular, the example right there in haddock is broken:

catch (openFile f ReadMode) (\e -> hPutStr stderr ("Couldn't open "++f++": " ++ show e))

That's broken, of course, because the type of e isn't fixed. But it's also broken because openFile has a different return type than hPutStr.

I think the correct code would be something like this: catch (openFile f ReadMode) (\(e::SomeException) -> hPutStr stderr ("Couldn't open "++f++": " ++ show e)) >> throwIO e) Although it might be better to replace "SomeException" with "IOException". -- Dave Menendez http://www.eyrie.org/~zednenem/