A couple patches

[Simon Marlow]

Neil Mitchell wrote:
> Hi
> 
>> The unsafePerformIO patch is something Neil asked me to send in. It's a
>> cleaned up, slightly renamed and documented version of inlinePerformIO
>> that we use in ByteString, but exported from System.IO.Unsafe.
>> Similarly, the unsafeDupablePerformIO are also exported (separate
>> patches). And implementations are given for non-GHC so it should all
>> still work. This is not a direct proposal, but rather a request for
>> comments. If people think it's not insane to give people this much rope
>> then we can send the patch through the libraries submission process.
> 
> As I requested it, its not entirely surprising that I support this.
> The reality is that in some cases people need this rope (I do for
> Uniplate and Supero, for instance) and I'd rather get my rope in a
> properly documented portable manner, than getting black-market rope
> which may disappear some day.
> 
> That said, my guess is that the unsafePerformIO patch should go
> through the libraries submission process.

Sure, I think it would be good to have this in a standard place.  Duncan, 
will you do the proposal?

Cheers,
	Simon