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with-output-to-X added by mioo on Wed Mar 30 21:49:16 2016

;This works as I expect:

(define nowhere (make-output-port void void))
(with-output-to-port nowhere (lambda () (system "ls")))

;This does not work as I expect: 
(with-output-to-string (lambda () (system "ls")))

;is this intentional?

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Which R5RS procedure can be used to concatenate strings?
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