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[SR-15769] Using Self to construct a NSError in a NSError extension crashes #58046

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sindresorhus opened this issue Jan 24, 2022 · 0 comments
Open

[SR-15769] Using Self to construct a NSError in a NSError extension crashes #58046

sindresorhus opened this issue Jan 24, 2022 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@sindresorhus
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sindresorhus commented Jan 24, 2022 •
edited

Previous ID SR-15769
Radar None
Original Reporter @sindresorhus
Type Bug
Environment

Swift 5.5

Xcode 13.2.1

macOS 12.1

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

md5: 620afe08f75ec448aebd78b8f0bf36de

Issue Description:

Using Self to construct a NSError in a NSError extension crashes when called from a Swift error bridged to NSError.

It crashes in

libswiftCore.dylib`+[__SwiftNativeNSError allocWithZone:]:

with the error message: "__SwiftNativeNSError cannot be instantiated"

Minimal reproduction:

struct NoopError: Error {}

extension NSError {
    func foo() {
        _ = Self(
            domain: domain,
            code: code,
            userInfo: nil
        )
    }
}

(NoopError() as NSError).foo()

Changing the Self to NSError makes it not crash.
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@sindresorhus