# File lib/thor/util.rb, line 52
    def self.constants_in_contents(str, file = __FILE__)
      klasses = ObjectSpace.classes.dup
      Module.new.class_eval(str, file)
      klasses = ObjectSpace.classes - klasses
      klasses = klasses.select {|k| k < Thor }
      klasses.map! {|k| k.to_s.gsub(/#<Module:\w+>::/, '')}
    end