kotlin-fork/compiler/testData/diagnostics/tests/smartCasts/varnotnull/nestedLoops.fir.kt

fun x(): Boolean { return true }

public fun foo(qq: String?): Int {
    var q = qq
    while(true) {
        q!!.length
        var r = q
        do {
            var p = r
            do {
                // p = r, r = q and q is not null
                p.length
            } while (!x())
        } while (r == null) // r = q and q is not null
        if (!x()) break
    }
    // Smart cast is possible
    return q.length
}