This is something I don't see a lot of people do. I've tended to do

  for long,list,of,variables,here
  in ageneratorhere(bigparameterhere)
  do
  end

and

  local x do
    -- everything after is just here to define x
  end

I'm still a little irked it works so well, the only alternative would be for the language to have labeled blocks. but that might be too terse