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[SR-7432] Can't see through boxed _SwiftValue when casting from @objc Type #49975

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tkrajacic opened this issue Apr 13, 2018 · 4 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself runtime The Swift Runtime

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@tkrajacic
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Previous ID SR-7432
Radar rdar://problem/39415812
Original Reporter @tkrajacic
Type Bug
Status Reopened
Resolution
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, Runtime
Assignee None
Priority Medium

md5: be79066c5a2ee131780c4b6bfd8678cb

Issue Description:

When conforming to an @objc protocol, the check using `is` can't get the original type information.

In the Playground, uncomment the @objc in front of the protocol and suddenly the check at the end doesn't pick up on the fact that the passed type is in fact a `User.Type`

import Foundation

//@objc(Exporter)
protocol Exporter: NSObjectProtocol {
var type: Any { get }
func export(item: Any)
}

struct User { var name: String }

final class UserExporter: NSObject, Exporter {
var type: Any { return User.self }
func export(item: Any) {
guard let u = item as? User else {
return print("That's not a user")
}
print("Got user: \(u.name)")
}
}

let user = User(name: "Kermit")
let exporter: Exporter = UserExporter()

if exporter.type is User.Type {
print("Correct exporter")
}
exporter.export(item: user)
@belkadan
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@swift-ci create

@tkrajacic
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Tested in Xcode 10 and Swift 4.2 and this problem still exists.

@tkrajacic
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This problem is still present in Xcode 10.2 and Swift 5!

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis
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Fixed by #33561 (test here).

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Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself runtime The Swift Runtime
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3 participants