Suppress warnings: reserved for numbered parameter

enc/unicode/case-folding.rb

@@ -232,7 +232,7 @@ class CaseMapping
     @version = nil
     IO.foreach(File.join(mapping_directory, 'UnicodeData.txt'), mode: "rb") do |line|
       next if line =~ /^</
-      code, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11, upper, lower, title = line.chomp.split ';'
+      code, _, _, _, _, _, _, _, _, _, _, _, upper, lower, title = line.chomp.split ';'
       unless upper and lower and title and (upper+lower+title)==''
         @mappings[code] = MapItem.new(code, upper, lower, title)
       end