Doug Gregor 6075de1b62 Add upcoming feature ImplicitOpenExistentials for SE-0352 ...

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 #70873 / rdar://120902975.

2024-03-01 11:50:39 -08:00

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