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>Is there a way for
>the host to know if a given line in a script actually generates code, so
>that we can accept only valid lines as breakpoint locations in the editor ?

No official way, sorry. Perhaps we should add one.
Right now, you can do this by invoking luac -l -p and searching for the line
in the output. Or you can get your hands dirty and read the lineinfo data
structure in Proto. See ldebug.c.