One way to do delimited continuations might be to build on the state machine transformation behind generators and async/await. You can drop the `await`/`yield`

One way to do delimited continuations might be to build on the state machine transformation behind generators and async/await. You can drop the `await`/`yield` primitives that C#/Javascript use and introduce a `shift` primitive instead. In non-recursive situations you can even make the continuation objects statically sized. Kotlin goes this direction, for example, though it still requires an annotation on all functions that participate in continuations. This makes it fairly straightforward to tell where the `prompt` is- the root `suspend fun` passed to whatever API drives it. Making every function implicitly `suspend` would let you treat any function as a `prompt`.