*scratch*

# Force backtraces from Thin to output to STDERR
# workaround for http://stackoverflow.com/questions/4627928/get-rails-exceptions-to-show-using-capybara-and-selenium
module Thin::Logging
  def log_error(e=$!)
    STDERR.print "#{e}\n\t" + e.backtrace.join("\n\t")
  end
end

this is now in Thin master macournoyer/thin@54799d7