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[SR-12543] Segfault if use Self.typealias from protocol #54987

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swift-ci opened this issue Apr 7, 2020 · 2 comments
Open

[SR-12543] Segfault if use Self.typealias from protocol #54987

swift-ci opened this issue Apr 7, 2020 · 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 type checker Area → compiler: Semantic analysis

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@swift-ci
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swift-ci commented Apr 7, 2020

Previous ID SR-12543
Radar rdar://problem/61911121
Original Reporter qRoC (JIRA User)
Type Bug
Environment

1) xCode 11.4

2) Apple Swift version 5.2-dev (LLVM 26ec4a6, Swift 6adc3e6)
Target: x86_64-apple-darwin19.4.0

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, CompilerCrash, TypeChecker
Assignee None
Priority Medium

md5: a076d8b7d5ca78f591ac14bbed48fd80

Issue Description:

protocol P {
    associatedtype AT
    typealias T = UnsafePointer<AT>

    var a: T { get }
}
public struct S<AT>: P {
    // var a: Self.T // ok
    var a: Self.T { fatalError() }
    let b: UnsafePointer<T>
}

Result:
Assertion failed: (GenericSig && "Dependent type in pattern without generic signature?"), function requiresClass, file /Users/buildnode/jenkins/workspace/oss-swift-package-osx/swift/lib/SIL/AbstractionPattern.cpp, line 231.
@weissi
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weissi commented Apr 13, 2020

@swift-ci create

@swift-ci
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swift-ci commented Jul 8, 2020

Comment by Helge Heß (JIRA)

Not sure it's the same thing, but I get the same crash in my new project with Linux Swift 5.2/5.1.

swift: /home/buildnode/jenkins/workspace/oss-swift-5.2-package-linux-ubuntu-18_04/swift/lib/SIL/AbstractionPattern.cpp:224: bool swift::Lowering::AbstractionPattern::requiresClass() const: Assertion `GenericSig && "Dependent type in pattern without generic signature?"' failed.

It is fixed in the 5.3 nightly Docker, but I'm trying to figure out whether I could workaround 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
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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 type checker Area → compiler: Semantic analysis
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@weissi @swift-ci @AnthonyLatsis