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Suppose I have a pair of obviously contrived C# classes like this: public abstract class Foo { public abstract int[] LegalValues { get; } public virtual bool IsValueLegal(int val) { return Array.IndexOf(LegalValues, val) >= 0; } } and this: public class Bar : Foo { static int[] _legalValues = new int[] { 0, 1 }; // whatever public sealed override int[] LegalValues { get { return _legalValues; } } public sealed override bool IsValueLegal(int val) { return base.IsValueLegal(val); } } How do I do this in F#? The obvious code for the properties: [<Sealed>] override this.LegalValues with get() = // ... [<Sealed>] override this.IsValueLegal value = // ... Triggers an error because the SealedAttribute apparently can't be applied to members. I can, of course, seal the entire class and thereby seal all members, but (and this is a really important but) is that I have a goal of matching an existing class signature exactly and the base class has other virtual/abstract members that should, ideally, remain overridable.

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