The main point I was trying to make here was that very complex expressions are very, very rare.<br><br>An acceptable compromise would be to analyse what can be done without busting a vein, and to flag anything anthing else as an error (&quot;expression too complicated&quot;) and document the way around, presumably a user-defined variable where the user provides the type. And if the expressions is really so complex, this might even imrove readability ;-)<br>
<br>Wolfgang<br><br>