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>> I appreciate adding this "use x do ... end" might cause just as many
>> problems as this scoping discussion is trying to solve.
>It's beginning to look like a sort of let x = foo in ... end construct,
>familiar to functional programmers.

We have this already:

	let x=a and y=b in ... end

can be written in Lua as
	do local x,y=a,b ... end

Note the parallel evaluation in x,y=a,b : Even if x and y appear in a and b,
they're not the local ones, they're from the enclosing scope.