Now having generators is nothing new, but I don't want to take too much away from TFA, as there are some interesting things there. I'll limit myself to pointing out that the Icon programming language had generators and pervasive backtracking using CPS in the Icon-to-C compiler, and that other languages with generators and pervasive backtracking have been implemented with CPS as well as with bytecode VMs that don't have any explicit (internally) continuations. Examples include Prolog, Icon, and jq, to name just three, and now of course, Rama.