get() = withValidityAssertion { symbol.receiverType }

    override fun substitute(substitutor: KtSubstitutor): KtFirVariableLikeSignature<S> = withValidityAssertion {
        if (substitutor is KtSubstitutor.Empty) return@withValidityAssertion this
        require(substitutor is AbstractKtFirSubstitutor<*>)

        KtFirVariableLikeSubstitutorBasedSignature(token, firSymbol, firSymbolBuilder, substitutor.substitutor)
    }
}

    }

    override fun substitute(substitutor: KtSubstitutor): KtFirFunctionLikeSignature<S> = withValidityAssertion {
        if (substitutor is KtSubstitutor.Empty) return@withValidityAssertion this
        require(substitutor is AbstractKtFirSubstitutor<*>)

        KtFirFunctionLikeSubstitutorBasedSignature(token, firSymbol, firSymbolBuilder, substitutor.substitutor)
    }
}

import org.jetbrains.kotlin.analysis.api.lifetime.KtLifetimeToken
import org.jetbrains.kotlin.analysis.api.scopes.KtScope
import org.jetbrains.kotlin.psi.KtElement

// Resolve extensions are not supported on FE1.0, so return empty results.
internal class KtFe10ResolveExtensionInfoProvider(
    override val analysisSession: KtFe10AnalysisSession,
) : KtResolveExtensionInfoProvider(), Fe10KtAnalysisSessionComponent {
    override val token: KtLifetimeToken

        get() = owningProperty.token

    override val annotationsList: KtAnnotationsList
        get() = withValidityAssertion {
            KtFe10AnnotationsList.create(descriptor?.annotations ?: Annotations.EMPTY, analysisContext)
        }

    override val analysisScopeProviderImpl: KtAnalysisScopeProvider =
        KtAnalysisScopeProviderImpl(this, token, shadowedScope = GlobalSearchScope.EMPTY_SCOPE)
    override val referenceResolveProviderImpl: KtReferenceResolveProvider = KtFe10ReferenceResolveProvider(this)
    override val signatureSubstitutorImpl: KtSignatureSubstitutor = KtFe10SignatureSubstitutor(this)

        }

        fun buildSubstitutor(substitutor: ConeSubstitutor): KtSubstitutor {
            if (substitutor == ConeSubstitutor.Empty) return KtSubstitutor.Empty(token)
            return when (substitutor) {
                is ConeSubstitutorByMap -> KtFirMapBackedSubstitutor(substitutor, this@KtSymbolByFirBuilder)

        val typeParameter = firSymbol.fir.typeParameters.singleOrNull() ?: return KtSubstitutor.Empty(token)

        val elementType = resolvedType.arrayElementType() ?: return KtSubstitutor.Empty(token)
        val coneSubstitutor = substitutorByMap(mapOf(typeParameter.symbol to elementType), rootModuleSession)

    }
    add(FirErrors.INCORRECT_CHARACTER_LITERAL) { firDiagnostic ->
        IncorrectCharacterLiteralImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.EMPTY_CHARACTER_LITERAL) { firDiagnostic ->
        EmptyCharacterLiteralImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }

    override fun createSubstitutor(
        subClass: KtClassOrObjectSymbol,
        superClass: KtClassOrObjectSymbol,
    ): KtSubstitutor? {
        if (subClass == superClass) return KtSubstitutor.Empty(token)

        val baseFirSymbol = subClass.firSymbol
        val superFirSymbol = superClass.firSymbol
        val inheritancePath = collectInheritancePath(baseFirSymbol, superFirSymbol) ?: return null

- [`KT-60601`](https://youtrack.jetbrains.com/issue/KT-60601) K2 / Maven: Overload resolution ambiguity between candidates inline method
- [`KT-62027`](https://youtrack.jetbrains.com/issue/KT-62027) "java.lang.IndexOutOfBoundsException: Empty list doesn't contain element at index 0" caused by ClassicExpectActualMatchingContext.kt when annotation `@AllowDifferentMembersInActual` used