'Null stream stream' presentation slideshows

(defmacro (delay x) (list 'lambda () x)) (define (force (promise <function>)) (promise))

(defmacro (delay x) (list 'lambda () x)) (define (force (promise <function>)) (promise)) ==> (define p (delay (print "hello"))) ==> (force p) hello. (defclass <stream> ()) (defclass <null-stream> (<stream>)) (defclass <cons-stream> (<stream>) (head-stream :accessor head-stream

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