fun convert(analysisSession: KtFirAnalysisSession, diagnostic: KtDiagnostic): KtFirDiagnostic<*> {
        val creator = conversions[diagnostic.factory] ?: buildCreatorForPluginDiagnostic(diagnostic.factory)

        @Suppress("UNCHECKED_CAST")
        return with(analysisSession) {
            when (creator) {
                is KtFirDiagnostic0Creator -> with(creator) {
                    create(diagnostic as KtSimpleDiagnostic)
                }