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What's wrong with Joonas Pihlaja's proposal?

 do with f, g ="src.txt","r"),"dst.txt",w")
    for l in f:lines() do

(Probably with a different syntax...)

I've been using it in metalua for a while (syntax "with <var_list> = <values_list> do <scoped_statements> end") for some time, with the convention that the protected variables must have a ":close()" disposal method, and I'm pretty happy with it.