That would be interesting to see. (I've never heard of such a thing...)
Best I could find was this:
https://groups.google.com/forum/#!topic/golang-nuts/L5Lothlv...
It also led to a real world example where the author tried using Go for a project and had a lot of need for Generics:
http://oneofmanyworlds.blogspot.com/2011/11/draft-2-of-propo...
Didn't someone fork Go and do exactly that only to get ignored? Perhaps it was a rumor, do you know? I'll see if I can find any reference to it.