UFile (package = )
    UClass (name = MethodReferenceKt)
        UField (name = x)
            UAnnotation (fqName = org.jetbrains.annotations.NotNull)
            UCallableReferenceExpression (name = bar)
        UMethod (name = getX)
    UClass (name = Foo)
        UMethod (name = bar)
            UBlockExpression
        UMethod (name = Foo)
