Exeption handling in GHC

[Hal Daume III]

You're probably using IO (or System.IO) try.  If you want imprecise
exceptions (I think that's the right name), you want to use
Control.Exception versions of try/catch/bracket/etc.

Prelude> :m IO
Prelude IO> :t try
forall a. IO a -> IO (Either GHC.IOBase.Exception a)
Prelude IO> try (error "a")
*** Exception: a
Prelude IO> :m Control.Exception
Prelude Control.Exception> try (error "a")
Prelude Control.Exception> it
Left a


HTH

 - Hal

--
Hal Daume III

 "Computer science is no more about computers    | hdaume@isi.edu
  than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume

On Fri, 24 Jan 2003, Sarah Thompson wrote:

> Hi all,
> 
> I'm trying to get exception handling working in GHC, but don't seem to be
> able to make it work. Am I likely to be missing a compiler switch, or
> something?
> 
> Cutting things down to basics, I'd have thought that the following
> expression (typed at the ghci command prompt) should work:
> 
> 	try (error "x")
> 
> but the result is
> 
> 	*** Exception: x
> 
> I seem to get the same problem with compiled code. Any ideas anyone?
> 
> TIA,
> Sarah
> 
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