[racket] world/universe update model (functional update redux), using the I/O monad for state

On Dec 12, 2011, at 5:36 PM, Stephen Bloch wrote:

> I would very much like to see SOME kind of functional-update feature bundled -- whether it comes along with define-struct, or with big-bang, doesn't matter much to me.


We are working on it in a rather different context.