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> > I thought upvaluejoin can only join upvalues. How can it be used to
> > break the link?
> function breaklink (f, upidx)
>   local a
>   local function dummy () return a end
>   debug.upvaluejoin(f, upidx, dummy, 1)
> end

In words: to create a new link you must break the old one.

-- Roberto