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[SR-9548] EXC_BAD_ACCESS when casting NSError to custom Swift.Error within a function #51997

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swift-ci opened this issue Dec 20, 2018 · 2 comments
Closed

[SR-9548] EXC_BAD_ACCESS when casting NSError to custom Swift.Error within a function #51997

swift-ci opened this issue Dec 20, 2018 · 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 standard library Area: Standard library umbrella

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@swift-ci
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Previous ID SR-9548
Radar None
Original Reporter leonid.kokhnovych (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Environment

OS X: 10.14.2 (18C54)

Xcode: Version 10.1 (10B61)

swiftc --version

Apple Swift version 4.2.1 (swiftlang-1000.11.42 clang-1000.11.45.1)

Target: x86_64-apple-darwin18.2.0

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

md5: ec9ccf1e97e808e3f56a47fea6e90a24

duplicates:

  • SR-9207 Crash casting NSError to URLError in Swift 4.x

Issue Description:

There is a crash with reason EXC_BAD_ACCESS when running the following code:

import Foundation


enum Test1Error: Error {
    case test1
}


enum Test2Error: Error {
    case test2
}


func testFunction(_ error: NSError) {
    let myError = error as? Test2Error
    print(String(describing: myError))
}


testFunction(Test1Error.test1 as NSError)

It does print "nil" from the "testFunction" in the Xcode console, but it gets crashed upon returning to the line

testFunction(Test1Error.test1 as NSError)

I used Xcode Playground to test the code.

As a workaround for the crash, you can first cast NSError to Swift.Error and then to a custom Swift.Error:

import Foundation


enum Test1Error: Error {
    case test1
}


enum Test2Error: Error {
    case test2
}


func testFunction(_ error: NSError) {
    let myError = (error as Error) as? Test2Error
    print(String(describing: myError))
}


testFunction(Test1Error.test1 as NSError)
@belkadan
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@mikeash, is this one of the things that got fixed for 5.0?

@mikeash
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mikeash commented Dec 20, 2018

Looks the same as https://bugs.swift.org/browse/SR-9207 but I haven't yet fixed it.

@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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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 standard library Area: Standard library umbrella
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@mikeash @belkadan @swift-ci @AnthonyLatsis