# File lib/new_relic/agent/threading/backtrace_node.rb, line 118
        def dump_string(indent=0)
          @file, @method, @line_no = parse_backtrace_frame(@raw_line)
          result = "#{" " * indent}#<BacktraceNode:#{object_id} [#{@runnable_count}] #{@file}:#{@line_no} in #{@method}>"
          child_results = @children.map { |c| c.dump_string(indent+2) }.join("\n")
          result << "\n" unless child_results.empty?
          result << child_results
        end