#stream utility chicken-scheme lazy stream
sicpの3章で出てくる遅延ストリーム用です

##Usage

(use mystream)

##Reference ####cons-stream [procedure] (cons-stream x y)
return a lazy cons

	(define-syntax cons-stream
	  (syntax-rules ()
		((_ x y)
		  (cons x (delay y)))))

####stream-car, stream-cdr stream-carはcarと等価です
stream-cdrはlazy-consのcdr部をforceします
####stream-null?, the-empty-stream the-empty-streamは'()と、stream-null?はnull?と等価です
####stream-ref ####stream-take ####stream-map ####stream-for-each ####stream-filter ####display-stream ####stream-enumerate-intarval ####integers-starting-from