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[SR-4439] Compiler crashes when chaining case statements that capture values with weak references #47016

swift-ci opened this issue Mar 30, 2017 · 2 comments


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@swift-ci swift-ci commented Mar 30, 2017

Previous ID SR-4439
Radar None
Original Reporter ibsh (JIRA User)
Type Bug
Status Resolved
Resolution Done

Attachment: Download

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

md5: 42ecce32954c17632e7caea2dde28d5f

is duplicated by:

  • SR-4487 Crash when pattern matching two cases with associated values of protocol type

relates to:

  • SR-4417 Compiler crashes when get value from enum specific case.

Issue Description:

If a value type has a weak property, a switch statement that chains multiple case statements together, where those case statements each capture an instance of that type, will crash the Swift compiler with a segfault when attempting to emit SIL.

See the attached Playground and compare the two implementations of equality for TroubledEnum, but in short:

switch self {
    case .a(let x): return x
    case .b(let x): return x

works fine but

switch self {
    case .a(let x), .b(let x): return x

does not.

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@belkadan belkadan commented Mar 31, 2017

Possibly related to SR-4417?

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@DougGregor DougGregor commented Jul 25, 2020

Seems to work in Swift 5.3

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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3 participants