Swift is bad

bad.swift

// wdym structs and classes have different assignment semantics, and it still persists with protocols ??

protocol P {
    var data: Int { get set }
}

struct A: P {
    var data = 0
}

class B: P {
    var data = 0
}

func func1() {
    var s = A()
    s.data = 5
    var c = B()
    c.data = 5

    print("S data: \(s.data)")
    print("C data: \(c.data)")

    var s2 = s
    var c2 = c

    s2.data = 10
    c2.data = 10

    print("Updated A data: \(s.data)")
    print("Updated B data: \(c.data)")
}

func func2() {
    var s: P = A()
    s.data = 5
    var c: P = B()
    c.data = 5

    print("S data: \(s.data)")
    print("C data: \(c.data)")

    var s2: P = s
    var c2: P = c

    s2.data = 10
    c2.data = 10

    print("Updated A data: \(s.data)")
    print("Updated B data: \(c.data)")
}

func main() {
    print("Function 1:")
    func1()
    print("\nFunction 2:")
    func2()
}

main()

/* Output:
Function 1:
S data: 5
C data: 5
Updated A data: 5
Updated B data: 10

Function 2:
S data: 5
C data: 5
Updated A data: 5
Updated B data: 10
*/