old_contents: const router = require('express').Router()
  module.exports = router
  
  router.use('/users', require('./users'))
  
  router.use((req, res, next) => {
    const error = new Error('Not Found')
    error.status = 404
    next(error)
  });
  
  
new_contents: const router = require('express').Router()
  module.exports = router
  
  router.use('/users', require('./users'))
  
  router.use((req, res, next) => {
    const error = new Error('Not Found')
    error.status = 404
    next(error)
  })
  
subject: remove errant semi