@Suppress("UNCHECKED_CAST")
            val factory = diagnostic.factory as DiagnosticFactory<UnboundDiagnostic>?
            return factory?.defaultRenderer?.render(diagnostic)
                ?: DefaultErrorMessages.getRendererForDiagnostic(diagnostic)?.render(diagnostic)
                ?: ""
        }

    override val psi: PsiElement
        get() = withValidityAssertion { diagnostic.psiElement }