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- (call/cc0 f) is like
(call/cc f), except the continuation given to f
must be invoked with zero arguments. Invoking the continuation
returns #<void> as the result of the call/cc0 expression.
- (let/cc k body ...)
expands to
(call/cc (lambda (k) body ...))
- (letcc k body ...) is equivalent to
(let/cc k body ...).
PLT