private fun FirExpression.findSourceKtExpressionForCallArgument(): KtExpression? {
        // For smart-casted expression, refer to the source of the original expression
        // For spread, named, and lambda arguments, the source is the KtValueArgument.
        // For other arguments (including array indices), the source is the KtExpression.
        return when (this) {
            is FirSamConversionExpression ->

     * - in `vararg args: String` declaration, `String` type reference has fake source, but `Array<String>` has real source
     * (see [KtFakeSourceElementKind.ArrayTypeFromVarargParameter]).
     * - if FIR reference points to the type with generic parameters (like `Foo<Bar>`), its source is not [KtTypeReference], but
     * [KtNameReferenceExpression].
     */