* imports, the symbol from "smaller" kind is used. For example, an explicitly imported symbol can overwrite a star-imported symbol.
 */
private enum class ImportKind {
    /** The symbol is available from the local scope and hence cannot be imported or overwritten. */
    LOCAL,

    /** Explicitly imported by user. */
    EXPLICIT,

    /** Implicitly imported from package. */
    PACKAGE,

            if (this !is FirNamedReference) return null

            // In most cases, we can get the callee name from the callee's candidate symbols. However, there is at least one case where we
            // cannot do so:
            // ```
            // fun x(c: Char) {}
            // fun call(x: kotlin.Int) {
            //   operator fun Int.invoke(a: Int) {}
            //   operator fun Int.invoke(b: Boolean) {}