FILE: noBackingFieldForExtension.kt
    public abstract interface B : R|kotlin/Any| {
        public abstract fun foo(): R|kotlin/Int|

    }
    public final class A : R|kotlin/Any| {
        public constructor(): R|A| {
            super<R|kotlin/Any|>()
        }

        public final val R|kotlin/String|.x: R|kotlin/Int|
            public get(): R|kotlin/Int| {
                ^ (this@R|/A|, this@R|/A.x|).R|/A.field|.R|/B.foo|()
            }

        public final val R|kotlin/String|.field: R|B|
            public get(): R|B| {
                ^ R|kotlin/TODO|()
            }

    }