That is not a global variable, it is a closed-over variable, which, in terms of self-containedness, is a whole different beast. See also http://marijn.haverbeke

That is not a global variable, it is a closed-over variable, which, in terms of self-containedness, is a whole different beast. See also http://marijn.haverbeke.nl/cps/ http://marijn.haverbeke.nl/cps/ .