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[SR-10647] No error when conforming to RangeReplaceableCollection #53047

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swift-ci opened this issue May 9, 2019 · 6 comments
Closed

[SR-10647] No error when conforming to RangeReplaceableCollection #53047

swift-ci opened this issue May 9, 2019 · 6 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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@swift-ci
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swift-ci commented May 9, 2019

Previous ID SR-10647
Radar None
Original Reporter Jaap (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate

Attachment: Download

Environment

macOS 10.14.4

Xcode 10.2.1

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

md5: 0413c3a305281391daba15a807bdb59f

duplicates:

  • SR-6501 RangeReplaceableCollection default implementations cause infinite recursion

Issue Description:

Compiler doesn't give errors when conforming to the RangeReplaceableCollection without implementing

replaceSubrange(:with:)

. Program compiles without errors. Running a program calling

replaceSubrange(:with:)

results in a bad access error
@belkadan
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Can you attach an example project or playground so that we can see what you did implement?

@tkrajacic
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@belkadan I added a sample project since I found this bug to be the same I was just going to file. There is a recursive call to protocol witnesses. @gwynne knowns more 😉

This is tested in Xcode 11b4

@tkrajacic
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Which actually seems to be the same as SR-6501

@gwynne
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gwynne commented Jul 26, 2019

Yep, this is a dupe of 6501, though the sample project is definitely nice to have 🙂

@gwynne
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gwynne commented Jul 26, 2019

The information available in this report should be copied over to SR-6501; the failure of the compiler to complain as shown here leads directly to the recursion demonstrated there.

@tkrajacic
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SR-5211 is also the same

@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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@belkadan @tkrajacic @gwynne @swift-ci