start (Debugger)

    # File lib/ruby-debug-base.rb, line 199
      def start(options={}, &block)
        options = Debugger::DEFAULT_START_SETTINGS.merge(options)
        if options[:init]
          Debugger.const_set('ARGV', ARGV.clone) unless
            defined? Debugger::ARGV
          Debugger.const_set('PROG_SCRIPT', $0) unless
            defined? Debugger::PROG_SCRIPT
          Debugger.const_set('INITIAL_DIR', Dir.pwd) unless
            defined? Debugger::INITIAL_DIR
        end
        Debugger.tracing = options[:tracing] unless options[:tracing].nil?
        retval = Debugger.started? ? block && block.call(self) : Debugger.start_(&block)
        if options[:post_mortem]
          post_mortem
        end
        return retval
      end