else -> KtFirGenericSubstitutor(substitutor, this@KtSymbolByFirBuilder)
            }
        }
    }

    /**
     * N.B. This functions lifts only a single layer of SUBSTITUTION_OVERRIDE at a time.
     */
    private inline fun <reified T : FirCallableDeclaration> T.unwrapSubstitutionOverrideIfNeeded(): T? {
        unwrapUseSiteSubstitutionOverride()?.let { return it }