Edit-time MOP

Last week I have attended the AOSD'06 conference in my old hometown in Bonn - it was nice to be back there for a week, meet some friends, go to some favorite places of mine, especially Cafe Göttlich, and at the same time do some work. I have found one of the presentations I have seen especially intriguing, about a first implementation of an edit-time metaobject protocol. Unfortunately, it is implemented in the wrong language. ;) I think this could be a worthwhile project to implement in Lisp or Scheme.