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Are we overthinking the problem? Just because something is a string doesn't 
mean it doesn't have structure. When Lua raises an error I get a message like 

>  aatree.lua:206: cannot insert nil in tree

It tells me the file and line number of the error. The traceback, if included, 
also has file names and line numbers in it. The information is there, you just 
need to have your debugger parse the error message for it.

tom <>