-- be set? setToAbleCostCentre is allowed to panic on
-- "nonsense" cases, too...
-#if DEBUG
+#ifdef DEBUG
setToAbleCostCentre NoCostCentre = panic "setToAbleCC:NoCostCentre"
setToAbleCostCentre SubsumedCosts = panic "setToAbleCC:SubsumedCosts"
setToAbleCostCentre CurrentCC = panic "setToAbleCC:CurrentCC"