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[SR-15656] Compiler crashes when accessing a constant declared within an actor #57935

TheHarcker opened this issue Dec 23, 2021 · 0 comments


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@TheHarcker TheHarcker commented Dec 23, 2021

Previous ID SR-15656
Radar None
Original Reporter @TheHarcker
Type Bug

Attachment: Download


"Apple Swift version 5.5.2 (swiftlang-1300.0.47.5 clang-1300.0.29.30)" bundled with Xcode 13.2 (13C90)

MacOS 12.1 (21C52) running on Apple Silicon

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

md5: 290caef4f2e957816cbee165e1cb13cc

Issue Description:

When accessing a constant member of an actor defined within another module, the Swift compiler crashes.

The attached project contains two modules: "dependency" in which an actor "A" with a constant member is declared, and "SwiftCrash" which depends on "dependency" and uses "A" within an async function.

Expected behaviour

The expected declaration of said function:

func aFunction(a: A) -> String{    
    return a.requiredString

Which compiles as long as "A" is defined within the same module.

When "A" is defined within another module, the compiler will throw one of the following errors depending on whether "aFunction" is async:


actor-isolated property 'requiredString' can not be referenced from a non-isolated context 


Expression is 'async' but is not marked with 'await'
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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