Issues with new Control.Exception
dave at zednenem.com
Wed Jan 28 16:50:09 EST 2009
On Wed, Jan 28, 2009 at 4:00 PM, John Goerzen <jgoerzen at complete.org> 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)
hPutStr stderr ("Couldn't open "++f++": " ++ show e)) >>
Although it might be better to replace "SomeException" with "IOException".
Dave Menendez <dave at zednenem.com>
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