-// cs0657.cs : 'event' is not a valid attribute location for this declaration. Valid attribute locations for this declaration are 'method, param, return'
-// Line: 14
+// CS0657: `event' is not a valid attribute location for this declaration. Valid attribute locations for this declaration are `method, param, return'. All attributes in this section will be ignored
+// Line: 15
+// Compiler options: -warnaserror
using System;