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Resolve unsound interaction between noalias and self-referential data (incl. generators, async fn) #63818

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Resolve unsound interaction between noalias and self-referential data (incl. generators, async fn)#63818
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A-async-awaitArea: Async & AwaitArea: Async & AwaitA-coroutinesArea: CoroutinesArea: CoroutinesAsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.C-bugCategory: This is a bug.Category: This is a bug.I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessT-langRelevant to the language teamRelevant to the language team
@Mark-Simulacrum

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@Mark-Simulacrum
Mark-Simulacrum
opened on Aug 22, 2019
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Self-referential generators violate LLVM's expectations for noalias due to the overlapping bounds of the interior references and the &mut self argument to the Generator::resume function.

Original issue description: async/await is possibly unsound -- I don't consider myself an authority here, so feel free to edit this top post with relevant information.

Current discussion happened in #63209

schneiderfelipe and ariesdevilljgermainschneiderfelipe, stanislav-tkach, p--b and joseluis

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    A-async-awaitArea: Async & AwaitArea: Async & AwaitA-coroutinesArea: CoroutinesArea: CoroutinesAsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.C-bugCategory: This is a bug.Category: This is a bug.I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessT-langRelevant to the language teamRelevant to the language team

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