fun evaluate(
        fir: FirElement?,
        mode: KtConstantEvaluationMode,
    ): FirLiteralExpression<*>? =
        when (fir) {
            is FirPropertyAccessExpression -> {
                when (val referredVariable = fir.calleeReference.toResolvedVariableSymbol()) {
                    is FirPropertySymbol -> {
                        if (referredVariable.callableId.isStringLength) {