anchor.diff:  
   /// Declares a reference to a single child element.
   ///
  -/// The `ViewChildren` annotation takes an argument to select elements.
  +/// The `ViewChild` annotation takes an argument to select elements.
   ///
   /// - If the argument is a [Type], a directive or a component with the type will
   /// be bound.
  
positive.code: ///   ''',
  ///   directives: const [ChildCmp]
  /// )
  /// class SomeCmp {
  ///   @ViewChildren(ChildCmp)
  ///   QueryList<ChildCmp> children;
  ///
  ///  @override
  ///   ngAfterViewInit() {
  ///     // children are set
  ///     for ( var child in children ) {
  
negative.code:   ///         <ng-content></ng-content>
    ///       ''',
    ///       directives: const [ChildDirective, SingleChildDirective])
    ///     class SomeDir implements AfterContentInit, AfterViewInit {
    ///       QueryList<ChildDirective> contentChildren;
    ///       QueryList<ChildDirective> viewChildren;
    ///       SingleChildDirective contentChild;
  