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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