[ltratt]

A crude R/Python composition would be fairly simple (http://goo.gl/p1opSl shows that a strict and lazy language can be crudely put together pretty easily, though you miss good performance and all the programmer-friendly features of PyHyp). Closures/generators are unlikely to be a big deal (PyHyp has good suggestions for both). Although I don't know much about R's class system(s), I expect that we can probably do OK on those. However, I have no idea how R's vectorised types might be handled -- those could be painful to deal with, or they might just fall out of the hat, and I'd have to know more about them in order to make an informed guess. However, this isn't on our roadmap at the moment, as it doesn't fit in with our current funding, unless anyone wants to change our minds!