callOrAssignmentSource: KtSourceElement?,
    ): KtDiagnosticWithPsi<*>? {
        val firDiagnostic = toFirDiagnostics(analysisSession.useSiteSession, source, callOrAssignmentSource).firstOrNull() ?: return null
        check(firDiagnostic is KtPsiDiagnostic)
        return firDiagnostic.asKtDiagnostic()
    }

    val KtType.coneType: ConeKotlinType
        get() {
            require(this is KtFirType)
            return coneType