stream-delay[syntax] stream-delay expr
SRFI-40: Returns a stream which is a delayed form of expr---when
the value of the components of the stream is needed, expr is evaluated.
(define from0
(let loop ((x 0))
(stream-delay
(stream-cons x (loop (+ x 1))))))
from0 => (stream 0 1 2 3 4 5 6 ...)
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