public override int IndexOf(Func <TNode, bool> predicate)
 => SyntaxList.IndexOf(node => predicate(SyntaxWrapper.Wrap(node)));
 public override TNode this[int index]
 => SyntaxWrapper.Wrap(SyntaxList[index]);
 public override TNode First()
 => SyntaxWrapper.Wrap(SyntaxList.First());
 public override TNode LastOrDefault()
 => SyntaxWrapper.Wrap(this.syntaxList.LastOrDefault());