code: function expandNodes(nodes) {
  	      var expander = new _Expander();
  	      return new ExpansionResult(visitAll(expander, nodes), expander.isExpanded, expander.errors);
  	  }
docs: Expands special forms into elements.
  
  For example,
  
  ```
  { messages.length, plural,
  =0 {zero}
  =1 {one}
  other {more than one}
  }
  ```
  
  will be expanded into
  
  ```
  <ng-container [ngPlural]="messages.length">
  <template ngPluralCase="=0">zero</ng-container>
  <template ngPluralCase="=1">one</ng-container>
  <template ngPluralCase="other">more than one</ng-container>
  </ng-container>
  ```