let c = Character(Unicode.Scalar("98765")!)

let c = Character(Unicode.Scalar(12345)!)
(`Unicode.Scalar("12345")!` causes runtime crash.)

extension Character {
    init?(_ codePoint: UInt32) {
        guard let us = Unicode.Scalar(codePoint) else {
            return nil
        }
        self = Character(us)
    }
}

print(Character(12345)!)