By contrast, a do while loop provides for the action's ongoing execution unless a given condition is determined to be false, " i . e . ", provides for that action's execution subject to defeasance by the condition's falsity, which falsity ( " i . e . ", the truth of the condition's negation ) is set as a condition subsequent.
22.
On the one hand, a condition that a person shall " not be of Jewish parentage " has been held by the House of Lords to be void for conceptual uncertainty, at any rate in a condition subsequent, see " Clayton v Ramsden " [ 1943 ] A . C . 320 : and a condition that a person shall be " of the Jewish race " was held by Mr . Justice Dankwerts to be void for conceptual uncertainty, even in a condition precedent, see " Re Tarnpolsk " [ 1958 ] 1 WLR 1157.
