try {
calcNameSet.add(name);
changeCount = extChanges.getUnhandledChangeCount();
script.run(stack, context);
newAlias = (String) stack.peekDescriptor();
newValue = (SimpleData) stack.pop();
if (newValue != null && newAlias == null)
newValue = (SimpleData) newValue.getEditable(false);
} catch (ExecutionException e) {
logger.warning("Error executing " + name + ": " + e);