Power.swift

operator ^^: PowerPrecedence
precedencegroup PowerPrecedence {
    higherThan: MultiplicationPrecedence
    associativity: right
}

func ^^ <A: Multiplicative> (lhs: A, rhs: Int) -> A {
    var a = A.multId
    for _ in 0..<rhs {
        a = a * lhs
    }
    return a
    // This function is equivalent to
    // `return Array(repeating: lhs, count: rhs).reduce(A.multId, *)`
}