Lua Exercise

local function f(_ENV, _G, table)
   -- how to access global "table" from here?
end

local env_without_G = setmetatable({}, {
   __index =
      function (tbl, key)
         if key ~= "_G" and key ~= "table" then
            return _ENV[key]
         end
      end
})

f(env_without_G, nil, nil)