The gen:stream documentation has this example:
(define-struct list-stream (v)
#:methods gen:stream
[(define (stream-empty? stream)
(empty? (list-stream-v stream)))
(define (stream-first stream)
(first (list-stream-v stream)))
(define (stream-rest stream)
(rest (list-stream-v stream)))])
I believe this example is broken in a sneaky way; the “stream-rest” operation
returns a simple list rather than a list-stream. This happens to “work” wrt
things like stream-rest and stream-first because lists are also streams. I
claim that this should instead read:
(define-struct list-stream (v)
#:methods gen:stream
[(define (stream-empty? stream)
(empty? (list-stream-v stream)))
(define (stream-first stream)
(first (list-stream-v stream)))
(define (stream-rest stream)
(list-stream (rest (list-stream-v stream))))])
Can someone confirm that this is just a typo?
John
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