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Make UnsafePinned handling properly per-byte #4819

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Make UnsafePinned handling properly per-byte#4819
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RalfJung
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A-aliasingArea: This affects the aliasing model (Stacked/Tree Borrows)C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementI-misses-theoretical-UBImpact: Miri does not report UB when it should, but codegen also "misses" this UB

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@RalfJung
RalfJung
opened on Jan 19, 2026

UnsafeCell gets treated in a per-byte way by SB and TB (at least in the default configuration). rust-lang/rust#151365 adds support for UnsafePinned, but so far we just handle this in an all-or-nothing way. We should make it per-byte as well.

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A-aliasingArea: This affects the aliasing model (Stacked/Tree Borrows)C-enhancementCategory: a PR with an enhancement or an issue tracking an accepted enhancementI-misses-theoretical-UBImpact: Miri does not report UB when it should, but codegen also "misses" this UB

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