# File lib/rspec/core/configuration.rb, line 407
      def debug=(bool)
        return unless bool
        begin
          require 'ruby-debug'
          Debugger.start
        rescue LoadError => e
          raise "\n\#{'*'*50}\n\#{e.message}\n\nIf you have it installed as a ruby gem, then you need to either require\n'rubygems' or configure the RUBYOPT environment variable with the value\n'rubygems'.\n\n\#{e.backtrace.join(\"\\n\")}\n\#{'*'*50}\n"
        end
      end