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> So, what about the semantics become a exprlist?
> exprlist ::= expr { ',' expr } |
>                  namelist 'in' expr
> this allows some syntax:
> local a, b, c = d, e, f in t
> dump(a, b, c in t)
> local t = {a, b, c in t}

That would be quite cute.  Of course, I'm not familiar enough with the grammar to know if it might cause other kinds of parser trouble :)  

If you could get it working, I'd certainly be a fan of such a patch.