On Tue, Apr 11, 2006 at 11:03:22AM +0100, Simon Marlow wrote:

This is a rather useful extension, and as far as I can tell it doesn't have a ticket yet:

http://www.haskell.org//pipermail/libraries/2005-March/003494.html

should I create a ticket? Is there any reason it might be hard to implement?

There are a range of proposals, but none of them are implemented. Wouldn't that rule them out for Haskell'?