[5.9] Observable protocol non-marker, @Observable class only #67196
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* Make ObservationRegistrar Codable/Hashable These conformances enable automatic Codable synthesis for Observable types, and smooth the runway for structs being supported by the Observable macro in the future. * Limit Observable macro to classes This removes the ability for the Observable macro to apply to structs, and adds diagnostic tests for the three disallowed declaration kinds.
…ang#66993) With support for redundant conformance declarations via macros, the `Observable` protocol can be a non-marker protocol, which provides more flexibility for evolution in the future. rdar://111463883 This change also switches to the new ExtensionMacro protocol, the requirement for which includes information about whether the conformance to the Observable protocol has already been added, either in the declaration or in a superclass to the macro-attributed type. This allows the @observable macro to be applied to subclasses of observable types without redundant-conformance errors.
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@swift-ci Please test |
stephentyrone
approved these changes
Jul 10, 2023
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@swift-ci Please test |
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Observableto be a non-marker protocol, which in turns requires a change in the@Observablemacro to emit a conformance extension only when the target type doesn't already provide conformance@Observablemacro only applicable to classes (adding structs to the already-prohibited enums and actors)Sendable/Hashable/Codableconformances for theObservationRegistrartype@Observablemacro.@Observableto structs will receive a new compile-time error.Observableto be a non-marker protocol #66993 and Make the@Observablemacro class only #67033