class ActionView::StreamingTemplateRenderer::Body

def log_error(exception)
  logger = ActionView::Base.logger
  return unless logger
  message = +"\n#{exception.class} (#{exception.message}):\n"
  message << exception.annotated_source_code.to_s if exception.respond_to?(:annotated_source_code)
  message << "  " << exception.backtrace.join("\n  ")
  logger.fatal("#{message}\n\n")
end