Info: https://github.com/Kametrixom/The-Swift-Make-It-Compile-Challenge

Challenge1.swift

// Make this code compile without changing these lines 

func raw<T: RawRepresentable>(t: T) -> T.RawValue {
	return t.rawValue
}

let array : [E] = [.A(true), .B(1), .C("C")]

array.map(raw)

if case .C(let s?)? = array.first {}

// If you want a bigger challenge, include this part:

for elem in array {
	switch elem {
	case .C(_):
		print("C!")
	}
}

Congrats to @kostiakoval for solving the challenge when there wasn't an extended version yet
Congrats to @pyrtsa for solving the extended challenge ;)