Added error on attempt to use simulator on models with system...endsystem construct.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@39 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/simulator/SimulatorEngine.java

@@ -376,6 +376,11 @@ public class SimulatorEngine
 		this.modulesFile = modulesFile;
 		this.constants = constants;
 		
+		// check for presence of system...endsystem
+		if (modulesFile.getSystemDefn() != null) {
+			throw new SimulatorException("Sorry - the simulator does not currently handle the system...endsystem construct");
+		}
+		
 		try
 		{
 			int result; //used to look for errors