function callWithCbOrNextTick (func, cb, context) {
  if (this && this._server) {
    context = this._server
  }

  if (func.length === 0) {
    if (this._error) throw this._error
    func()
    process.nextTick(cb)
  } else if (func.length === 1) {
    func(this._error)
    process.nextTick(cb)
  } else if (func.length === 2) {
    func(this._error, cb)
  } else {
    func(this.rerror, context, cb)
  }
  // with this the error will appear just in the next after/ready callback
  this._error = null
}


___________________________

  const app = boot(server)                                                                                                                                                                                                            [19/736]

  app.use(function (s, opts, done) {
    done(new Error('err'))
  })

  app.after(function (err, cb) {
    t.ok(err instanceof Error)
    t.is(err.message, 'err')
    cb()
  })

  app.ready(function (err) {
    t.error(err)
  })
})

test('error should come in the first ready', (t) => {
  t.plan(2)

  const server = { my: 'server' }
  const app = boot(server)

  app.use(function (s, opts, done) {
    done(new Error('err'))
  })

  app.ready(function (err) {
    t.ok(err instanceof Error)
    t.is(err.message, 'err')
  })
})