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[SR-2585] Segmentation fault 11 when upcasting array of tuples #45190

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swift-ci opened this issue Sep 8, 2016 · 4 comments
Closed

[SR-2585] Segmentation fault 11 when upcasting array of tuples #45190

swift-ci opened this issue Sep 8, 2016 · 4 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 Sep 8, 2016

Previous ID SR-2585
Radar rdar://problem/28207648
Original Reporter bolismauro (JIRA User)
Type Bug
Status Closed
Resolution Done

Attachment: Download

Environment

Xcode Version 8.0 (8A218a)

Additional Detail from JIRA
Votes 2
Component/s Compiler
Labels Bug, CompilerCrash, TypeChecker
Assignee bolismauro (JIRA)
Priority Medium

md5: 4625881c9c9c368e43acfaa902d54dc4

Issue Description:

This code makes the compiler crashes

protocol AnyV {}
struct V<G>: AnyV {}

protocol MyProtocol {
  associatedtype Key
  associatedtype Value
  
  static var variable: [(Key, V<Value>)] { get }
  
  static func useVariable()
}

extension MyProtocol {
  static func useVariable() {
    let v = self.variable as [(Key, AnyV)]
  }
}
@belkadan
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belkadan commented Sep 8, 2016

I don't think the compiler considers that a valid upcast (from (Key, V<Value>) to (Key, AnyV)), though , but of course it shouldn't crash. Workaround: use map:

extension MyProtocol {
  static func useVariable() {
    let v = self.variable.map { ($0, $1) } as [(Key, AnyV)]
  }
}

@CodaFi
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CodaFi commented Sep 18, 2016

Resolved by the merge of #4705

@rudkx
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rudkx commented Sep 22, 2016

Mauro, can you verify with a recent build and close if it's fixed?

@swift-ci
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Comment by Mauro Bolis (JIRA)

It seems solved on my side

@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 type checker Area → compiler: Semantic analysis
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@rudkx @belkadan @CodaFi @swift-ci @AnthonyLatsis