Solving the Expression Problem with Clojure 1.2

Duplicates, but with no discussion:

http://news.ycombinator.com/item?id=2151811

http://news.ycombinator.com/item?id=2014181

http://news.ycombinator.com/item?id=2007700

Related:

http://news.ycombinator.com/item?id=1916943

http://news.ycombinator.com/item?id=1607832