I guess by making the closure explicit they've made implementing them much easier too. The problem of trying to figure out which variables the function is close

I guess by making the closure explicit they've made implementing them much easier too. The problem of trying to figure out which variables the function is closed over is no longer there (which makes me curious because judging from my own experience in creating a scheme-clone, this wasn't that difficult). I bet it just transforms down into a function or maybe even gets inlined.