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[SR-4059] Compiler Crash on Subclasses Further Constraining Generics Initializer #46642

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swift-ci opened this issue Feb 24, 2017 · 6 comments
Closed

[SR-4059] Compiler Crash on Subclasses Further Constraining Generics Initializer #46642

swift-ci opened this issue Feb 24, 2017 · 6 comments
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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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@swift-ci
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Previous ID SR-4059
Radar None
Original Reporter Logan (JIRA User)
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, 3.1Regression, CompilerCrash
Assignee None
Priority Medium

md5: 918fe3645f29300276cb0a409197574f

Issue Description:

Not sure if that title is the ticket, but here's repro. Runs and builds fine on 3.0.2, crash seg fault on 3.1:

    class Base {
        init<S: Sequence>(_ s: S) where S.Iterator.Element == UInt8 {

        }
    }

    class Sub: Base {
        init(_ b: [UInt8]) {
            super.init(b)
        }
    }
@belkadan
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Looks like this is fixed on master but still fails on the 3.1 branch. @huonw, any insights? Is there something small enough to pull in?

@huonw
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Mannequin

huonw mannequin commented Feb 24, 2017

I don't think anything I've done would've touched this. I recall @DougGregor doing something with where-clauses on methods a while ago, but I also recall that the situation there was possibly a little different. In summary, no insights.

@DougGregor
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Swift 3.1 is apparently considering this initializer to be an override, then crashes later in SILGen. Master correctly doesn't consider it to be an override.

@DougGregor
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GitHub master: #7788

Porting this to Swift 3.1 fixes the crasher there, which I'll do as soon as that PR merges.

@DougGregor
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3.1 PR: #7792

@DougGregor
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691c11f

@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
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@belkadan @DougGregor @swift-ci @AnthonyLatsis