(defun parse1 (input)
  (nyala:parse (input)
    (line -> :line => `(line ,$1))
    (:line -> (= blah (* (- t #\Newline))) #\Newline => blah)))

(parse1 "bla
") ; => (LINE "bla")

(defun parse2 (input)
  (nyala:parse (input)
    (line -> :line => `(line ,$1))
    (:line -> (= blah (* (- t :eol))) :eol => blah)
    (:eol -> #\Newline)))

(parse2 "bla
")                                      ; => [error: invalid number of arguments: 3]