FILE: boundSafeCallAndIsCheck.kt
    public abstract interface A : R|kotlin/Any| {
        public abstract val b: R|B|
            public get(): R|B|

    }
    public abstract interface B : R|kotlin/Any| {
    }
    public abstract interface C : R|B| {
        public abstract fun q(): R|kotlin/Boolean|

    }
    public final fun R|A|.foo(): R|kotlin/String| {
        ^foo String()
    }
    public final fun main(a: R|A?|): R|kotlin/Unit| {
        lval lb: R|B?| = R|<local>/a|?.{ $subj$.R|/A.b| }
        when () {
            (R|<local>/lb| !is R|C|) ->  {
                ^main Unit
            }
        }

        R|<local>/a|.R|/foo|().R|kotlin/String.length|
    }