- make-accumulator kons knil finalizerprocedure
Returns an accumulator that, when invoked on an object other than an end-of-file object, invokes kons on its argument and the accumulator's current state, using the same order as a function passed to fold. It then sets the accumulator's state to the value returned by kons and returns an unspecified value. The initial state of the accumulator is set to knil. However, if an end-of-file object is passed to the accumulator, it returns the result of tail-calling the procedure finalizer on the state. Repeated calls with an end-of-file object will reinvoke finalizer.