# File lib/sass/callbacks.rb, line 36
    def define_callback(name)
      class_eval "def on_\#{name}(&block)\n  @_sass_callbacks ||= {}\n  (@_sass_callbacks[\#{name.inspect}] ||= []) << block\nend\n\ndef run_\#{name}(*args)\n  return unless @_sass_callbacks\n  return unless @_sass_callbacks[\#{name.inspect}]\n  @_sass_callbacks[\#{name.inspect}].each {|c| c[*args]}\nend\nprivate :run_\#{name}\n"
    end