Compiler Error CS0641

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'attribute' : attribute is only valid on classes derived from System.Attribute

An attribute was used that can only be used on a class that derives from System.Attribute.

The following sample generates CS0641:

// CS0641.cs
using System;

[AttributeUsage(AttributeTargets.All)]
public class NonAttrClass   // CS0641
// try the following line instead
// public class NonAttrClass : Attribute
{
}

class MyClass
{
   public static void Main()
   {
   }
}