[GHC] #1171: GHC doesn't respect the imprecise exceptions semantics

[Neil Mitchell]

Hi

>  In response to Neil: why use `unsafePerformIO` rather than IO exceptions
>  here?  I think you're asking for more trouble...

Are you referring to ioError? My knowledge of exceptions in Haskell is limited.

The error architecture is often a long way from the IO monad, so
whatever we do can't require the IO monad.

Thanks

Neil