On Fri, Jul 18, 2008 at 6:11 PM, David Nicol <davidnicol@[...].com>  wrote:
>  Or it could be encoded like "${linenumber}P${position}" so
>  math on the value would not be affected at all, and position could be
>  extracted with a split.  The "argument ... isn't numeric" warning
>  would have to be silenced, perhaps by only providing the additional
>  information when caller()[2] is accessed as a string?

Returning a dualvar would silence the warning.