class ActionDispatch::DebugExceptions

def render_exception(env, exception)
  wrapper = ExceptionWrapper.new(env, exception)
  log_error(env, wrapper)
  if env['action_dispatch.show_detailed_exceptions']
    template = ActionView::Base.new([RESCUES_TEMPLATE_PATH],
      :request => Request.new(env),
      :exception => wrapper.exception,
      :application_trace => wrapper.application_trace,
      :framework_trace => wrapper.framework_trace,
      :full_trace => wrapper.full_trace,
      :routes_inspector => routes_inspector(exception),
      :source_extract => wrapper.source_extract,
      :line_number => wrapper.line_number,
      :file => wrapper.file
    )
    file = "rescues/#{wrapper.rescue_template}"
    body = template.render(:template => file, :layout => 'rescues/layout')
    render(wrapper.status_code, body)
  else
    raise exception
  end
end