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[SR-12861] Capturing computed variable before it's declared crashes compiler #55307

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swift-ci opened this issue May 22, 2020 · 1 comment
Open

[SR-12861] Capturing computed variable before it's declared crashes compiler #55307

swift-ci opened this issue May 22, 2020 · 1 comment
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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 SILGen Area → compiler: The SIL generation stage

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@swift-ci
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Previous ID SR-12861
Radar None
Original Reporter cukier (JIRA User)
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, CompilerCrash, SILGen
Assignee None
Priority Medium

md5: f814a86a1c91b31007635aa1c8622855

Issue Description:

this code crashes compiler

class Test {
    func f() -> (() -> Void) {
        return { print(u) }
        var u: Int { 123 }
    }
}
Test().f()()
SIL verification failed: external declaration of internal SILFunction not allowed: F->isAvailableExternally()
In function:
// getter of u #​1 in Test.f()
sil private @$s3foo4TestC1fyycyF1uL_Sivg : $@convention(thin) () -> Int

there's also a stack dump that I didn't copy-paste
@theblixguy
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This is a regression since Swift 5.2 - before that we used to error out with cannot capture 'u' before it is declared.

@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 SILGen Area → compiler: The SIL generation stage
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@theblixguy @swift-ci @AnthonyLatsis