return null
    }

    /**
     * Use-site substitution override happens in situations like this:
     *
     * ```
     * interface List<A> { fun get(i: Int): A }
     *
     * fun take(list: List<String>) {
     *   list.get(10) // this call
     * }
     * ```
     *
     * In FIR, `List::get` symbol in the example will be a substitution override with a `String` instead of `A`.