get() = withValidityAssertion { descriptor.setter != null }

    override val setter: KtPropertySetterSymbol?
        get() = withValidityAssertion {
            if (!descriptor.isVar) {
                return null
            }

            val setter = descriptor.setter ?: return KtFe10DescDefaultPropertySetterSymbol(descriptor, analysisContext)
            KtFe10DescPropertySetterSymbol(setter, analysisContext)
        }

        }

    override val setter: KtPropertySetterSymbol?
        get() = withValidityAssertion {
            if (!psi.isVar) {
                return null
            }

            val setter = psi.setter ?: return KtFe10PsiDefaultPropertySetterSymbol(psi, analysisContext)
            return KtFe10PsiPropertySetterSymbol(setter, analysisContext)
        }

        }

    override val setter: KtPropertySetterSymbol?
        get() = withValidityAssertion {
            if (descriptor.isDynamic()) return null
            if (!descriptor.isVar) {
                return null
            }

            val setter = descriptor.setter ?: return KtFe10DescDefaultPropertySetterSymbol(descriptor, analysisContext)

The build state is managed by the `BuildState` class.
An instance is created for each build in the build definition, once per build execution and is discarded at the end of the execution. 

The build state also includes what is currently called the "Gradle state". The Gradle state is being merged into the build state and is mostly empty.

### Project state

         * (via generateReflectiveAccessForGetter) and it is called for the private access member lowered to the getter/setter call.
         * If a private property has no getter/setter (the typical situation for simple private properties without explicitly defined
         * getter/setter) then this method is not used at all. Instead

        override val analysisContext: Fe10AnalysisContext
    ) : KtValueParameterSymbol(), KtFe10Symbol {
        val descriptor: ValueParameterDescriptor?
            get() = propertyDescriptor.setter?.valueParameters?.singleOrNull()

        override val hasDefaultValue: Boolean
            get() = withValidityAssertion { false }

        override val isVararg: Boolean

        val bindingContext = analysisContext.analyze(propertyPsi, Fe10AnalysisFacade.AnalysisMode.PARTIAL)
        (bindingContext[BindingContext.VARIABLE, propertyPsi] as? PropertyDescriptor)?.setter
    }

    override val origin: KtSymbolOrigin
        get() = withValidityAssertion { propertyPsi.ktSymbolOrigin }

    override val psi: PsiElement?
        get() = withValidityAssertion { null }

            token,
        )
    }
    add(FirErrors.ABSTRACT_PROPERTY_WITH_SETTER) { firDiagnostic ->
        AbstractPropertyWithSetterImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.PRIVATE_SETTER_FOR_ABSTRACT_PROPERTY) { firDiagnostic ->
        PrivateSetterForAbstractPropertyImpl(

        get() = withValidityAssertion { descriptor.setter != null }

    override val setter: KtPropertySetterSymbol?
        get() = withValidityAssertion {
            if (!descriptor.isVar) {
                return null
            }

            val setter = descriptor.setter ?: return KtFe10DescDefaultPropertySetterSymbol(descriptor, analysisContext)
            KtFe10DescPropertySetterSymbol(setter, analysisContext)
        }

## Build state model

As Gradle executes, it acts on various pieces of the build definition, such as each project in the build.
Gradle tracks the state of each piece and transitions each piece through its lifecycle as the build runs.

A central part of the Gradle architecture is the "build state model", which holds the state for each piece and coordinates state transitions and other mutations.