anchor.diff:        ).drain();
   }
   
  -class _XmlForEachEventHandler with XmlEventVisitor {
  -  const _XmlForEachEventHandler({
  +class XmlEventHandler with XmlEventVisitor {
  +  const XmlEventHandler({
       this.onCDATA,
       this.onComment,
       this.onDeclaration,
  
positive.code:     EventHandler<XmlStartElementEvent>? onStartElement,
      EventHandler<XmlTextEvent>? onText,
    }) {
      final handler = _XmlForEachEventHandler(
        onCDATA: onCDATA,
        onComment: onComment,
        onDeclaration: onDeclaration,
  
negative.code:     EventHandler<XmlStartElementEvent>? onStartElement,
      EventHandler<XmlTextEvent>? onText,
    }) {
      final handler = XmlEventHandler(
        onCDATA: onCDATA,
        onComment: onComment,
        onDeclaration: onDeclaration,
  