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[SR-1924] locally defined class after return crashes compiler #44533

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mattneub opened this issue Jun 28, 2016 · 3 comments
Closed

[SR-1924] locally defined class after return crashes compiler #44533

mattneub opened this issue Jun 28, 2016 · 3 comments
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@slavapestov
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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

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@mattneub
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Previous ID SR-1924
Radar None
Original Reporter @mattneub
Type Bug
Status Resolved
Resolution Done
Environment

Xcode Version 8.0 beta (8S128d) and its version of Swift 3

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, CompilerCrash
Assignee @slavapestov
Priority Medium

md5: 1a0dc260ae3d2d9a42ce72bd4313424b

Issue Description:

This code crashes the compiler with a segfault:

    func test() {
        return;
        class A {
            
        }
    }

Neither the return; nor the locally defined class A is illegal. It's the combination of the two that's the problem: defining a class locally, at any depth, after a return seems to elicit the crash.
@slavapestov
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The AST is valid, however SILGen erroneously skips emitting the class because it thinks it's "code" that is unreachable.

@slavapestov
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Actually, since name lookup can't see the class in this case, it would be more correct to drop it altogether.

@slavapestov
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#6543

@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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@slavapestov slavapestov

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
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@slavapestov @mattneub @AnthonyLatsis