Better error message for non-supported S operator in explicit engine.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@6206 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/explicit/ProbModelChecker.java

@@ -635,9 +635,10 @@ public class ProbModelChecker extends StateModelChecker
 
 		// Compute probabilities
 		switch (modelType) {
-		/*case CTMC:
-			probs = ((CTMCModelChecker) this).checkSteadyStateFormula(model, expr.getExpression());
-			break;*/
+		case CTMC:
+			//probs = ((CTMCModelChecker) this).checkSteadyStateFormula(model, expr.getExpression());
+			//break;
+			throw new PrismException("Explicit engine does not yet support the S operator for CTMCs");
 		case DTMC:
 			probs = ((DTMCModelChecker) this).checkSteadyStateFormula(model, expr.getExpression());
 			break;