// CS0579: The attribute `ConditionalAttributeTesting.SomeAttribute' cannot be applied multiple times // Line: 12 using System; using System.Diagnostics; namespace ConditionalAttributeTesting { class MainClass { [Some ("Test")] [Some ("Test2")] public static void Test () { } } [AttributeUsage (AttributeTargets.All)] [Conditional ("NOT_DEFINED")] public sealed class SomeAttribute : Attribute { public SomeAttribute (string someText) { } } }