Add upcoming feature ImplicitOpenExistentials for SE-0352
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DougGregor
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bnbarham,
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xedin
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To maintain source compatibility, SE-0352 does not open existentials with "self-conforming" type, such as `any Error` or existentials based on `@objc` protocols. The proposal specified that this behavior would change in Swift 6. Implement that behavior change, which can be enabled prior to Swift 6 with the upcoming feature `ImplicitOpenExistentials` (as documented in SE-0362). Fixes swiftlang#70873 / rdar://120902975.
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To maintain source compatibility, SE-0352 does not open existentials with "self-conforming" type, such as
any Erroror existentials based on@objcprotocols. The proposal specified that this behavior would change in Swift 6. Implement that behavior change, which can be enabled prior to Swift 6 with the upcoming featureImplicitOpenExistentials(as documented in SE-0362).Fixes #70873 / rdar://120902975.