rouge.rb in rouge-lang-0.0.7

- old
+ new

@@ -16,9 +16,10 @@
   require 'rouge/seq'
   require 'rouge/reader'
   require 'rouge/printer'
   require 'rouge/context'
   require 'rouge/repl'
+  require 'set'
 
   def self.print(form, out)
     Rouge::Printer.print form, out
   end
 