return null;
IDocument document= viewer.getDocument();  int contextInformationPosition= guessContextInformationPosition(viewer, offset);  Vector results= new Vector(); addContextInformations(viewer, contextInformationPosition, results);  return (IContextInformation[]) results.toArray(new IContextInformation[results.size()]);
	public IContextInformation[] computeContextInformation(ITextViewer viewer, int offset) {		return null;	}