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Roberto Ierusalimschy wrote:

Lua 4 does not have lexical scope, so you should use upvalues. But you
cannot use an upvalue before giving it its final value. One way out
of this is to use a table to create an indirection:

  function F ()
    local t = {}
    t.G = function (value)
            if value == 10 then
              return "stop"
            end
            return %t.G(value + 1)
          end
    print( t.G(1) )
  end

Not pretty, but I cannot think of anything better.
Thanks Roberto. I didn't occur to me to use a table. It is prettier than passing the function around. 

Regards,
Ignacio Burgueño