No line number on nil function?

["J. Perkins" <jason@...>]

In my project, I have patched into luaD_error(), where I intercept 
scripting errors, add on file and line number information using the 
code from luaB__ERRORMESSAGE, and then quit the app (code available 
on request).

If a syntax error occurs in a script this works fine, but if a 
script tries to call a function that doesn't exist, ie. "attempt to 
call global 'XXX' (a nil value)", no file/line info is available. 
That is to say, 'lua_getstack(L, 1, &ar)' returns zero. In this 
case, is there anyway to get the file/line where the error occurred?

Thanks,
Jason
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