特に問題無い、はず。 gosh> (let ((s (make-string 5))) (string-set! s 0 #\H) (string-set! s 1 #\e) (string-set! s 2 #\l) (string-set! s 3 #\l) (string-set! s 4 #\o) s) "Hello" gosh> (run-program '(let ((s (make-string 5))) (string-set! s 0 …