typo

brag/rules/parser.rkt

@@ -170,7 +170,7 @@
                                                                  [(and range? max) (string->number max)]
                                                                  [(and (not range?) (not max)) (if (zero? min)
                                                                                                    #f ; {} -> {0,}
-                                                                                                   min))] ; {3} -> {3,3}
+                                                                                                   min)] ; {3} -> {3,3}
                                                                  [else #f])])
                                                      (cons min max))]))]
                 [else (raise-argument-error 'grammar-parse "unknown repetition operator" $2)]))