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[SR-10715] Throwing error in defer statement causes error. #419

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purpleblues opened this issue May 18, 2019 · 2 comments
Closed

[SR-10715] Throwing error in defer statement causes error. #419

purpleblues opened this issue May 18, 2019 · 2 comments
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@purpleblues
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@purpleblues purpleblues commented May 18, 2019

Previous ID SR-10715
Radar None
Original Reporter @purpleblues
Type Bug
Status Closed
Resolution Invalid
Environment

Xcode 10.2.1 (10E1001), Swift 5.0.1

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

md5: 0fb6eeb45ceff944eb03fa01e6941e17

Issue Description:

Please checkout the code below.

import Foundation

func test(_ work: () throws -> Void) throws {
    try work()
}

do {
    try test {
        
/* Error is not handled because the enclosing function is not declared 'throws' */
        defer { throw NSError(domain: "", code: 0, userInfo: nil) }
        
        print("hello")
    }
    
} catch {
     print(error.localizedDescription)
}

This code emits error that says "Error is not handled because the enclosing function is not declared 'throws'" for throwing in defer statement.

@theblixguy
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@theblixguy theblixguy commented May 18, 2019

You can’t throw inside a defer block. I changed the diagnostic a while ago on master to “'throw' cannot transfer control out of a defer statement”.

@purpleblues
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@purpleblues purpleblues commented May 18, 2019

Thanks Srijan.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 9, 2022
This issue was closed.
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