Faulty PAS source

From: Alistair George (noemailadds_at_xtra.co.nz)
Date: 05/29/04 

Date: Sun, 30 May 2004 07:56:11 +1200

For only the 3rd time in several years, I found that by retyping a line in
source code, an undefined error was fixed.
Does anyone know of a utility which parses PAS source files for invalid
(invisible) characters to ensure that the files are clean??
Thanks,
Alistair+