The page "Advanced Scheme: Some Naughty Bits" states:
Continuations are a powerful control-flow construct from which nearly any other control-flow structure [...] may be derived.
I thought that Scheme's
call/cc, being related (*) to Peter Landin's J operator, could be used to implement any known control flow structure?
With "control flow structure" I'm specifically thinking about Wikipedia's description of them, e.g. exceptions, coroutines, green threads and so on.
Specifically, are there any examples of control flow structures that cannot be implemented using
(*) I haven't been able to dig up any paper that establishes that
call/cc is as powerful as the J operator. A paper by Felleisen (which I haven't read and admittedly have problems understanding it fully) investigates this, and seems to conclude that even though they are in different complexity classes, they are formally equivalent.
(Also note that I have updated the question based on the comments below)
Based on the excellent answer by @Neel below, I've looked at sites commenting on delimited and undelimited continuations, and it does indeed seem that while
call/cc, being undelimited, is not sufficient. Meanwhile, first-class, delimited continuations (like
shift/reset) can be used, it seems, to express any control-flow structure.