if (fir is FirNamedFunctionSymbol && fir.origin != FirDeclarationOrigin.SamConstructor)
                return buildFunctionSignature(fir)
            return with(analysisSession) { buildFunctionLikeSymbol(fir).asSignature() }
        }

        fun buildFunctionSymbol(firSymbol: FirNamedFunctionSymbol): KtFirFunctionSymbol {
            firSymbol.fir.unwrapSubstitutionOverrideIfNeeded()?.let {