[swift-users] Using 'SomeProtocol' as a concrete type conforming to protocol 'SomeProtocol' is not supported

[Brandon Knope via swift-users]

I don’t understand why this is a problem

protocol Element {
    
}

enum ElementNode<T: Element> {
    case element(T)
    case empty
}

var childElements = [ElementNode<Element>]()

I need to represent an array of my nodes that could be multiple kinds of 
elements

Is there a workaround?

Brandon
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