* Kotlin. They cover the most popular visibilities `private`, `public`, and default (package) visibility for top-level and nested
     * classes.
     *
     * Returns `null` if visibility cannot be decided by the heuristic.
     */
    private fun KtFirPsiJavaClassSymbol.isVisibleByPsi(useSiteFile: KtFirFileSymbol): Boolean? {

- [`KT-61159`](https://youtrack.jetbrains.com/issue/KT-61159) K2: OVERLOAD_RESOLUTION_AMBIGUITY between private top-level property in same file and top-level property in different module
- [`KT-59233`](https://youtrack.jetbrains.com/issue/KT-59233) K2: false-negative diagnostic on creating a callable reference to a function with free type variables

                                    this += classFqName
                                }
                            } else if (fqName != qualifiedNameAsFqName) {
                                // or some kind of top level declaration with potential receiver
                                this += fqName
                                val receiverClassType = symbol.receiverParameter?.type as? KtNonErrorClassType

            // and are never considered used as expressions
            is KtUserType ->
                false

            // Only top-level named declarations have KtFile/KtScript Parents, and are never considered used
            is KtFile ->
                false
            is KtScript ->
                false