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[SR-6309] Could not cast value of type '_SwiftValue' to a protocol #48859

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swift-ci opened this issue Nov 6, 2017 · 2 comments
Closed

[SR-6309] Could not cast value of type '_SwiftValue' to a protocol #48859

swift-ci opened this issue Nov 6, 2017 · 2 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software run-time crash Bug → crash: Swift code crashed during execution

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@swift-ci
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swift-ci commented Nov 6, 2017

Previous ID SR-6309
Radar None
Original Reporter broadway_lamb (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Environment

Xcode 9.1 (9B55)
Apple Swift version 4.0.2 (swiftlang-900.0.69.2 clang-900.0.38)

Target: x86_64-apple-macosx10.

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, RunTimeCrash
Assignee None
Priority Medium

md5: 26d414d55a3bcfef503c6080d6743ae6

duplicates:

  • SR-3871 Protocol passing via objective-c / Any can't be cast back to protocol type

Issue Description:

Here is the code I'm trying to execute in a playground:

import Foundation

protocol P {}

struct S: P {
    let value: Int
}

let a: P = S(value: 13)

NotificationCenter.default
    .addObserver(forName: .init("foo"),
                 object: nil,
                 queue: nil) { note in
                    // CRASH
                    print(note.object as! P)
                 }

NotificationCenter.default.post(name: .init("foo"), object: a)

The program crashes when I'm trying to cast `note.object` to P. Seems like it has something to do with bridging to `id`, because when I just write:

let any: Any = a

print(any as! P)

everything is fine.
@tbkka
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tbkka commented Jan 29, 2020

Verifying: I can reproduce the problem in Xcode 11.1, but not in Swift master

@hujunfeng
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I can still reproduce this crash in Xcode 11.4.1 playground.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
This issue was closed.
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software run-time crash Bug → crash: Swift code crashed during execution
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@hujunfeng @swift-ci @AnthonyLatsis @tbkka