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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 #70873 / rdar://120902975.
21 lines
443 B
Swift
21 lines
443 B
Swift
// RUN: %target-typecheck-verify-swift -enable-upcoming-feature ImplicitOpenExistentials
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// RUN: %target-typecheck-verify-swift -swift-version 6
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#if _runtime(_ObjC)
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@objc
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protocol X {}
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func foo<T: X>(_ val: T.Type) {}
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func bar(_ val: X.Type) {
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// Only succeeds when we're allowed to open an @objc existential.
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foo(val)
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}
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#endif
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func takeError<E: Error>(_ error: E) { }
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func passError(error: any Error) {
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takeError(error) // okay
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}
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