Interesting that, AFAIK, computer science considers continuations a more generic mechanism than coroutines. Continuations allow continuation-passing style, creating from scratch other control flow mechanisms (like return from a subroutine), exceptions and coroutines (and maybe something else which can't be reduced to items from this list, I'm not sure). Wonder if all of that can be done with coroutines?
Continuations can be reused many times. With delimited continuations you capture the continuation as a function that works basically like any other function. With unlimited continuation you capture the continuation as a weird function that never returns but can still be kept as a closure-like thing and called repeatedly. The classic use of multiple continuation calls is “logic programming” or “nondeterminism” where for example you say “let x = choose [1,2,3]” and choose then arranges to have the continuation called three times (perhaps even concurrently).
