在ng-include模板中使用ng-transclude

Question

当尝试在ng-include模板中使用ng-transclude时，会抛出以下错误，

Error: [ngTransclude:orphan] Illegal use of ngTransclude directive in the template! No parent directive that requires a transclusion found. Element: <ng-transclude>

我确实已将transclude: true包含在指令范围内，

// directive1.html
<div>
    <div ng-include="template.html">
</div>

// template.html
<div>
  <ng-transclude></ng-transclude>
</div>