unique identifiers as a separate library

[ajb at spamcop.net]

G'day all.

Quoting Sebastian Fischer <sebf at informatik.uni-kiel.de>:

> I have wrapped up (a tiny subset of) GHC's uniques into the package
> `uniqueid` and put it on Hackage:
>
>     http://hackage.haskell.org/cgi-bin/hackage-scripts/package/uniqueid

First off, thanks for this.

> The main difference is due to my fear of depending on the foreign
> function `genSymZh` which I replaced by a global counting IORef.

Why not depend on this instead?

http://hackage.haskell.org/cgi-bin/hackage-scripts/package/value-supply

Cheers,
Andrew Bromage