func with<T>(_ item: T, update: (inout T) -> Void) -> T {
    var this = item
    update(&this)
    return this
}

let view = with(UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))) {
    $0.backgroundColor = .white
}
// error: Execution was interrupted, reason: EXC_BAD_ACCESS (code=EXC_I386_GPFLT)

public func withView(_ item: UIView, update: (inout UIView) throws -> Void) rethrows -> UIView {
    var this = item
    try update(&this)
    return this
}

let view = withView(UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))) {
    $0.backgroundColor = .black
}
// No error

let newView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
let view = with(newView) {
    $0.backgroundColor = .white
}
// No error