-// CS1685: The predefined type `System.Runtime.CompilerServices.ExtensionAttribute' is defined in multiple assemblies. Using definition from `System.Core'
+// CS1685: The predefined type `System.Runtime.CompilerServices.ExtensionAttribute' is defined multiple times. Using definition from `System.Core.dll'
// Line: 0
// Compiler options: -warn:1 -warnaserror -r:System.Core.dll -r:CS1685-2-lib.dll