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Matching on an enum should read the entire enum #56797
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A-NLLArea: Non-lexical lifetimes (NLL)Area: Non-lexical lifetimes (NLL)A-borrow-checkerArea: The borrow checkerArea: The borrow checkerI-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-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.fixed-by-NLLBugs fixed, but only when NLL is enabled.Bugs fixed, but only when NLL is enabled.
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A-NLLArea: Non-lexical lifetimes (NLL)Area: Non-lexical lifetimes (NLL)A-borrow-checkerArea: The borrow checkerArea: The borrow checkerI-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-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.fixed-by-NLLBugs fixed, but only when NLL is enabled.Bugs fixed, but only when NLL is enabled.
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Enum layout optimizations mean that the discriminant of an enum may not be stored in a tag disjoint from the rest of the fields of the enum. Run this example with MIRI to see this is a problem. https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=4ea0e31adbb3fe1893be528277060248
This is fixed by #56790, but this issue is being raised for tracking any backports.
cc @nikomatsakis