[5.9.0] SILGen: Don't reference external property descriptors for @backDeployed properties #67987
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…ed properties. The property descriptors of `@backDeployed` properties aren't available on OSes prior to the "back deployed before" OS version, so the descriptors cannot be referenced by clients that may run against older versions of the library that defines the property. See swiftlang#59214 for prior art. Resolves rdar://106517386
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@swift-ci please test |
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Swift 5.9.0 has been released |
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@backDeployedattribute would crash at runtime when running on older OSes. The property descriptors of@backDeployedproperties aren't available on OSes prior to the "back deployed before" OS version, so the descriptors cannot be referenced by clients that may run against older versions of the library that defines the property.@backDeployedattribute.@backDeployedare not common and apps forming these references were already broken when running on older OSes.@backDeployedwas updated to include a test case that reproduces the issue.