UFile (package = )
    UClass (name = ReceiverFunKt)
        UAnnotationMethod (name = foo)
            UParameter (name = $receiver)
                UAnnotation (fqName = MyReceiverAnnotation)
                UAnnotation (fqName = org.jetbrains.annotations.NotNull)
            UQualifiedReferenceExpression
                UThisExpression (label = null)
                USimpleNameReferenceExpression (identifier = length)
    UClass (name = MyReceiverAnnotation)
