我正在摆弄新的Swift 5.9宏。
我有以下宏：
给定以下枚举

@associatedValues
enum Fruit {
    case banana(Banana)
    case grape(Grape)
}

我想要

@associatedValues
enum Fruit {
    case banana(Banana)
    case grape(Grape)

    var bananaValue: Banana? { if ... return ... } }
    var grapeValue: Grape? { if ... return ... } }
}

我的实现是这样的：

public static func expansion<Declaration, Context>(
        of node: SwiftSyntax.AttributeSyntax,
        providingMembersOf declaration: Declaration,
        in context: Context
    ) throws -> [SwiftSyntax.DeclSyntax]
    where Declaration: SwiftSyntax.DeclGroupSyntax,
          Context: SwiftSyntaxMacros.MacroExpansionContext
    {
        
        guard let enumDeclaration = declaration.as(EnumDeclSyntax.self) else {
            throw AssociatedValuesMacroError.onlyApplicableToEnum
        }
        
        return enumDeclaration.memberBlock.members
            .compactMap { $0.decl.as(EnumCaseDeclSyntax.self) }
            .map { (_case: EnumCaseDeclSyntax) in

                let _element: EnumCaseElementListSyntax.Element = _case.elements.first!
                let caseName = _element.identifier
                let typeName = _element.associatedValue!.parameterList.first!.description

                return
                    """
                    var \(raw: caseName)Value: \(raw: typeName)? {
                        if case let .\(raw: caseName)(value) = self {
                            return value
                        } else {
                            return nil
                        }
                    }
                    """
            }
    }

现在，自动完成检测到新的属性，但编译器告诉我：
Declaration name 'bananaValue' is not covered by macro 'associatedValues'
Declaration name 'grapeValue' is not covered by macro 'associatedValues'
测试运行并验证输出，但不是在编译时。

我错过了什么？谢谢你