# File lib/turn/reporters/outline_reporter.rb, line 63
    def fail(assertion)
      message   = assertion.message.to_s
      backtrace = filter_backtrace(assertion.backtrace)

      io.puts(" #{FAIL}")
      io.puts Colorize.bold(message).tabto(8)

      unless backtrace.empty?
        label = "Assertion at "
        tabsize = 8
        backtrace1 = label + backtrace.shift
        io.puts(backtrace1.tabto(tabsize))
        if @trace
          io.puts backtrace.map{|l| l.tabto(label.length + tabsize) }.join("\n")
        end
      end
      show_captured_output
    end