locOrder.put(higherLoc, lowerLoc);
if (locOrder.isIntroducingCycle(higherLoc)) {
throw new Error("Error: the order relation " + lowerLoc + " < " + higherLoc
- + " introduces a cycle.");
+ + " introduces a cycle in the class lattice " + cd);
}
} else if (orderElement.contains("*")) {
// spin loc definition