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Missing setter implementation not detected by compiler
The following compiles successfully but throws an AbstractMethodError at runtime (1.8.10).
interface Interface {
var a: String
}

open class Open {
val a: String = "default"
}

class Impl : Open(), Interface

fun main() {
val x = Impl()
println(x.a)
x.a = ""
}

Why does the compiler allow this? Is this a known problem or am I missing something?
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