Re: [Haskell-cafe] Use unsafePerformIO to catch Exception?

On Wed, 2009-03-25 at 09:15 -0700, Donn Cave wrote:

Quoth Lennart Augustsson :

...

Some examples of what might happen:

OK, these are interesting phenomena. From a practical point of view, though, I could see someone weighing the potential costs and benefits of a exception handler outside IO like this, and these effects might not even carry all that much weight.

Well, sure. From a purely `practical' point of view, I don't know why you would even use a purely functional language (as opposed to trying to minimize side effects in an impure language). But if you're not concerned about purity, or ease of equational reasoning, or accuracy of a wide range of compiler transformations/optimizations/because it makes the generated code pretty to sort the formal parameters by name before forcing them-implementation decisions, then please do not use Haskell. There are many other languages that are suitable for what you want to do, and it would be a courtesy to those of us who *do* use Haskell because it is purely functional, not to have to explicitly exclude your library from our picture of the language's capabilities. jcc