kotlin-fork/compiler/testData/diagnostics/tests/dataFlow/local/LocalObjectDelegation.kt

// KT-2225 Object expression delegation parameter should be checked with data flow info

trait A {
    fun foo() : Int
}

class B : A {
    override fun foo() = 10
}
fun foo(b: B?) : Int {
    if (b == null) return 0
    val o = object : A by b { //no info about b not null check
    }
    return o.foo()
}