showUnique

[Andrew J Bromage]

G'day all.

On Tue, Dec 10, 2002 at 06:46:27PM -0800, John Meacham wrote:

> how about adding a show instance for Unique in Data.Unique?  oftentimes
> arbitrary unique labels need to be generated, but 'hashUnique' doesnt
> guarentee the returned Int is unique. there is no way to add this
> functionality outside of the Data.Unique module since Unique is opaque.

What do you propose that the show method would actually return on
a Unique?  I think this is far from obvious, as any such method
would break the opacity of Unique, and hence limit the number of
ways that it could be implemented.

Cheers,
Andrew Bromage