``` class User { var map: Map<String, Any?&...

# announcements

[marcinmoskala]

class User {
    var map: Map<String, Any?> = mapOf("A" to 1)
    val A: Int by map
}

fun main(args: Array<String>) {
    val u = User()
    println(u.A)
    u.map = mapOf("A" to 2)
    println(u.A)
}