one-time binding ng-options

According to docs, when using a directive that takes an expression, we are able set one-time binding as so:
`<ul>
  <li ng-repeat="item in ::items">{{item.name}};</li>
</ul>`

However, this doesn't seem to work with ng-options, tried (1.3.0 - 1.38)
`ng-options="o as o for o in ::things"`

If I place ::things in a binding it works. 
`ng-options="o as o for o in {{::things}}"` 
