kotlin/compiler/testData/codegen/boxWithJava/collections/irrelevantImplMutableListSubstitution/irrelevantImplMutableListSubstitution.kt

class X : J.A<Any?>()

fun box(): String {
    val x = X()
    if (x.size != 56) return "fail 1"
    if (!x.contains(null)) return "fail 2"

    return "OK"
}