public abstract class ExtensibleEnum<T> : IEquatable<T>
where T : ExtensibleEnum<T>

Public MustInherit Class ExtensibleEnum(Of T As ExtensibleEnum(Of T))
	Implements IEquatable(Of T)

generic<typename T>
where T : ExtensibleEnum<T>
public ref class ExtensibleEnum abstract : IEquatable<T>

[<AbstractClassAttribute>]
type ExtensibleEnum<'T when 'T : ExtensibleEnum<'T>> =  
    class
        interface IEquatable<'T>
    end