Merge pull request #3689 from arunagw/warning_removed_actionpack

Warning removed for shadowing variable

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -1252,7 +1252,7 @@ module ActionDispatch
             raise ArgumentError, "Unknown scope #{on.inspect} given to :on"
           end
 
-          paths.each { |path| decomposed_match(path, options.dup) }
+          paths.each { |_path| decomposed_match(_path, options.dup) }
           self
         end