@NonNull member variable is still null before completion of object construction

Language Design
1 
class A {
    init {
//         println(str) // compile time error: variable `str` must be initialized
        logContent() // no compile error, but `str` is `null` at this moment
    }
    
    val str = ""
    
    private fun logContent() {
        println(str)
    }
}


fun main() {
    A() // print: null
}

I know that this is logically wrong.
But, no compile time error, is this a bug of Kotlin ?

2

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