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[SR-12755] Cannot have an optional property stored property of same type #55200

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LucianoPAlmeida opened this issue May 8, 2020 · 4 comments
Closed

[SR-12755] Cannot have an optional property stored property of same type #55200

LucianoPAlmeida opened this issue May 8, 2020 · 4 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@LucianoPAlmeida
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Previous ID SR-12755
Radar rdar://problem/63031842
Original Reporter @LucianoPAlmeida
Type Bug
Status Closed
Resolution Invalid

Attachment: Download

Environment

Swift Development Snapshot 2020-04-29

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

md5: 9d5c1551c5c2aa5dd379d9eb0144adae

Issue Description:

Trying to define a property that contains a stored member of the Self type, gives an error even though the member is optional. The diagnostic would make sense if the type was no-optional because that would require an infinite type, but optional members should be allowed?

![](Screen Shot 2020-05-08 at 11.35.42.png)

Is that a bug or intended behavior?
@LucianoPAlmeida
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cc @xedin @DougGregor

@xedin
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xedin commented May 8, 2020

@swift-ci create

@slavapestov
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Optional<T> stores a copy of T inline, so a value type cannot contain an optional of itself. We cannot change this at this point even if we wanted to because of ABI stability.

@LucianoPAlmeida
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Ah ok, that's unfortunate. But thanks for taking a look @slavapestov

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@xedin @slavapestov @LucianoPAlmeida