//   operator fun Int.invoke(b: Boolean) {}
            //   <expr>x()</expr>
            // }
            // ```
            // The candidates for the call will both be `invoke`. We can keep it simple by getting the name from the callee reference's PSI
            // element (`x` in the above example) if possible.
            return when (val psi = psi) {
                is KtNameReferenceExpression -> psi.getReferencedNameAsName()