Swift struct max size

struct_max_size.swift

struct User {
    typealias Ten<T> = (T, T, T, T, T, T, T, T, T, T)

    let id: Int
    let name: String
    let storage: Ten<Ten<Ten<Ten<Ten<UInt64>>>>>?
}

func structMaxSize() {
    print("MemoryLayout<User>.size:", MemoryLayout<User>.size)
    let u = User(id: 0, name: "", storage: nil)
    print("MemoryLayout<User>.size of value:", MemoryLayout<User>.size(ofValue: u))

    let thread = Thread {
        let u = User(id: 0, name: "", storage: nil) // Thread 10: EXC_BAD_ACCESS (code=2, address=0x17025c000)
        print("MemoryLayout<User>.size of value:", MemoryLayout<User>.size(ofValue: u))
    }
    // thread.stackSize = 10 // Can't set stack size to a value lower than 16384 (requested 10)
    print("thread.stackSize:", thread.stackSize)
    thread.start()
}

swiftlang/swift#53485