In Swift, how to cast to protocol with associated type?

In Swift, how to cast to protocol with associated type?

swift generics swift3 protocols associated-types

swift

What is difference between Any , Hashable , AnyHashable in Swift 3?

ios swift swift3 associated-types hashable

swift

Swift - Associated value or extension for an Enum

swift enums associated-object associated-types computed-values

swift

Can't create an Array of types conforming to a Protocol in Swift

swift protocols associated-types

swift

Swift - Protocol can only be used as a generic constraint because it has Self or associated type requirements

swift swift-protocols associated-types

swift