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[SR-5836] Compilation crash in Dictionary extension #48406

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jlukas opened this issue Sep 4, 2017 · 4 comments
Closed

[SR-5836] Compilation crash in Dictionary extension #48406

jlukas opened this issue Sep 4, 2017 · 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

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@jlukas
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jlukas commented Sep 4, 2017

Previous ID SR-5836
Radar rdar://problem/34259886
Original Reporter @jlukas
Type Bug
Status Resolved
Resolution Done
Environment

Apple Swift version 4.0 (swiftlang-900.0.63.10 clang-900.0.36)

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

md5: b156cf3bcf7a4c66c58b83a54c3dae1b

is duplicated by:

  • SR-5932 Segmentation fault: 11 when creating a Set of optionals

Issue Description:

I'm not sure what exactly is causing the crash, but I reduced it this far:

Input:

extension Dictionary {
    func doSomething<T>() -> [T:Value] {
        let pairs: [(T,Value)] = []
        return Dictionary(uniqueKeysWithValues: pairs)
    }
}

Output:

Stack dump:
0.  While emitting SIL for 'doSomething()' at /var/folders/my/75k1c85j1s5fj3myg_4x273r0000gn/T/repl1-bcce9c..swift:2:5
@belkadan
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belkadan commented Sep 5, 2017

Huh. Looks like this was working in 900.0.54.11 and then we broke it again. @rudkx, @xedin?

@rudkx
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rudkx commented Sep 5, 2017

@swift-ci create

@rudkx
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rudkx commented Sep 5, 2017

I opened a PR to add this test to our test suite: #11773

If the code is updated to return [Key : Value] rather than [T : Value] and create an array of (Key, Value) pairs rather than (T, Value) pairs, we don't crash. Apparently there was a reason to make this generic on a new type in the original code this was reduced from, though.

@slavapestov
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#12150

@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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@jlukas @slavapestov @rudkx @belkadan @AnthonyLatsis