Documentation:Procedure call-with-current-continuation
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These procedures return a procedure that invokes the continuation, and not the continuations themselves.
> (procedure? (call/cc (lambda (k) k))) #t > (continuation? (call/cc (lambda (k) k))) #f > (procedure? (continuation-capture (lambda (k) k))) #f > (continuation? (continuation-capture (lambda (k) k))) #t