@swift-5.2.5
@dynamicMemberLookup public protocol Entity { associatedtype Identifier associatedtype Props var id: Identifier { get } var props: Props { get set } } extension Entity { public typealias SegFaultHere<T> = T @inlinable public subscript <Value>(dynamicMember keyPath: WritableKeyPath<Props, Value>) -> Value { get { props[keyPath: keyPath] } set { props[keyPath: keyPath] = newValue } } }