Sorry to bombard with generic questions...
I've just come across
interface IA<X>
{
...
}
interface IB<X> : IA<X?> // yes the '?' is not a typo
{
}
it does compile...it gives
The type 'A' must be a non-nullable value type in order to use it as
parameter 'T' in the generic type or method 'System.Nullable<T>'
i.e. it understands what the T is....but I don't.
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