ãã¼ãµã¼ã³ã³ããã¼ã¿ ã¨ã¯ãå°ããªãã¼ãµã¼ã åæ(combine) ãã¦è¤éãªãã¼ãµã¼ãä½ãä¸ãã¦ããææ³ã§ãããã®è¨äºã§ã¯ãRust ã§ç°¡åãªãã¼ãµã¼ã³ã³ããã¼ã¿ã®ã©ã¤ãã©ãªãä½æããããã使ã£ã¦ JSON ããã¼ã¹ãããã¨ãç®æãã¾ãã ãã¼ãµã¼ã³ã³ããã¼ã¿ã®ä½¿ç¨ä¾ ä»åä½æãããã¼ãµã¼ã³ã³ããã¼ã¿ã使ãã¨ä»¥ä¸ã®ãããªã³ã¼ããæ¸ãã¾ãã // ã«ã³ãåºåãã®æ´æ°åãåãä»ãããã¼ãµã¼ let digits_seq = separated(digits, character(',')); // "empty" ã¨ãããã¼ã¯ã¼ããåãåãã空㮠Vec ãè¿ããã¼ãµã¼ let empty_keyword = map(string("empty"), |_| vec![]); // ã«ã³ãåºåãã®æ´æ°å ã¾ã㯠"empty" ã¨ãããã¼ã¯ã¼ããåãä»ãããã¼ãµã¼ let parser =
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