Property.checkAgainstExpectedResultString: improve error message if there is an unexpected result type

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11993 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/parser/ast/Property.java

@@ -403,7 +403,7 @@ public class Property extends ASTElement
 			}
 			// Parse actual result
 			if (!(result instanceof Double))
-				throw new PrismException("Result is wrong type for (double-valued) property");
+				throw new PrismException("Result is wrong type (" + result.getClass() + ") for (double-valued) property");
 			double doubleRes = ((Double) result).doubleValue();
 			// Compare results
 			if (Double.isNaN(doubleRes)) {