FILES argument behaving funny

FILES accepts an optional first argument, a string used to filter the output. The following formats are documented for this filter:

• projname/ lists the files in the given project
• // lists all projects (/ being [DEFAULT] and SYS/ being [SYS])
• TXT: or DAT: to list only files of that type in the current project

In most cases where the input would be invalid, it throws Illegal function call. However, if you pass a project name without the trailing slash, it still works. In addition, if you pass a path that doesn't exist...it fails silently. Nothing happens, no error. It does set RESULT to false though.

does it update ERRNUM or ERRLINE?

does it update ERRNUM or ERRLINE?

No, because it doesn't throw an error.