MonoのC#コンパイラがバグッてる?
Mono 3.2.5で下のコードが通らない。

//Error CS0205: Cannot call an abstract base member `Element.Get<string>()' (CS0205)

public abstract class Element {
public abstract T Get<T>();
}
public abstract class StringElement : Element {
public override T Get<T>() {
return default(T);
}
}
public abstract class DateElement : StringElement {
public override T Get<T>() {
return base.Get<T>();
}
}