get() = withValidityAssertion {
            val diagnostic = firDiagnostic as KtDiagnostic

            val firDiagnosticRenderer = RootDiagnosticRendererFactory(diagnostic)
            return firDiagnosticRenderer.render(diagnostic)
        }

    override val textRanges: Collection<TextRange>
        get() = withValidityAssertion { firDiagnostic.textRanges }

    @Suppress("UNCHECKED_CAST")
    override val psi: PSI