"Phil Tomson" <ptkwt / shell1.aracnet.com> wrote in
....
> Is there something like...
> person.unextend Student (?)
> person.unmixin Student (?)

This was also a point  in a recent thread

http://groups.google.com/groups?q=unextend+ruby&hl=en&selm=200204011236.g31C
alx09659%40moulon.inra.fr&rnum=2


/Christoph