not thunkifying correctly or something (fixed)

thing.js

var co      = require('co')
var readln  = require('readline')

var rl = readln.createInterface({
    input: process.stdin
  , output: process.stdout
})

// make rl.question a thunk
function confirm(question) {
  return function(done) {
    var called = false
    rl.question.call(rl, question, function(result) {
      if (called) return
      called = true
      done.call(null, undefined, result)
    })
  }
}


co(thing())(function (err) {
  if (err) throw err
  process.exit()
})

function* thing() {
  var result = yield confirm('Continue? (yes) ')
  if ('string' == typeof result && /n|no/i.test(result)) process.exit()
  console.log('continued')
}