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Remove MutatingUseContext::Retag #160977

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Merged
rust-bors merged 1 commit into from
Aug 12, 2026
Merged

Remove MutatingUseContext::Retag #160977

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3 changes: 1 addition & 2 deletions compiler/rustc_borrowck/src/def_use.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -59,8 +59,7 @@ pub(crate) fn categorize(context: PlaceContext) -> Option<DefUse> {
PlaceContext::NonMutatingUse(NonMutatingUseContext::RawBorrow) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::Inspect) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::Copy) |
PlaceContext::NonMutatingUse(NonMutatingUseContext::Move) |
PlaceContext::MutatingUse(MutatingUseContext::Retag) => Some(DefUse::Use),
PlaceContext::NonMutatingUse(NonMutatingUseContext::Move) => Some(DefUse::Use),

///////////////////////////////////////////////////////////////////////////
// DROP USES
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3 changes: 1 addition & 2 deletions compiler/rustc_codegen_ssa/src/mir/analyze.rs
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Expand Up @@ -211,8 +211,7 @@ impl<'a, 'b, 'tcx, Bx: BuilderMethods<'b, 'tcx>> Visitor<'tcx> for LocalAnalyzer
}

PlaceContext::NonUse(_)
| PlaceContext::NonMutatingUse(NonMutatingUseContext::PlaceMention)
| PlaceContext::MutatingUse(MutatingUseContext::Retag) => {}
| PlaceContext::NonMutatingUse(NonMutatingUseContext::PlaceMention) => {}

PlaceContext::NonMutatingUse(
NonMutatingUseContext::Copy
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2 changes: 0 additions & 2 deletions compiler/rustc_middle/src/mir/visit.rs
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Expand Up @@ -1354,8 +1354,6 @@ pub enum MutatingUseContext {
/// f(&mut x.y);
/// ```
Projection,
/// Retagging, a "Stacked Borrows" shadow state operation
Retag,
}

#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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3 changes: 1 addition & 2 deletions compiler/rustc_mir_dataflow/src/impls/liveness.rs
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Expand Up @@ -180,8 +180,7 @@ impl DefUse {
PlaceContext::MutatingUse(
MutatingUseContext::RawBorrow
| MutatingUseContext::Borrow
| MutatingUseContext::Drop
| MutatingUseContext::Retag,
| MutatingUseContext::Drop,
)
| PlaceContext::NonMutatingUse(
NonMutatingUseContext::RawBorrow
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3 changes: 1 addition & 2 deletions compiler/rustc_mir_transform/src/deduce_param_attrs.rs
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Expand Up @@ -74,8 +74,7 @@ impl<'tcx> Visitor<'tcx> for DeduceParamAttrs {
MutatingUseContext::Store
| MutatingUseContext::SetDiscriminant
| MutatingUseContext::AsmOutput
| MutatingUseContext::Projection
| MutatingUseContext::Retag) => {
| MutatingUseContext::Projection) => {
self.usage[i] |= UsageSummary::MUTATE;
}
| PlaceContext::NonMutatingUse(NonMutatingUseContext::RawBorrow) => {
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1 change: 0 additions & 1 deletion compiler/rustc_mir_transform/src/known_panics_lint.rs
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Expand Up @@ -975,7 +975,6 @@ impl<'tcx> Visitor<'tcx> for CanConstProp {
// whether they'd be fine right now.
MutatingUse(MutatingUseContext::Yield)
| MutatingUse(MutatingUseContext::Drop)
| MutatingUse(MutatingUseContext::Retag)
// These can't ever be propagated under any scheme, as we can't reason about indirect
// mutation.
| NonMutatingUse(NonMutatingUseContext::SharedBorrow)
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3 changes: 1 addition & 2 deletions compiler/rustc_mir_transform/src/liveness.rs
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Expand Up @@ -1548,8 +1548,7 @@ impl DefUse {
PlaceContext::MutatingUse(
MutatingUseContext::RawBorrow
| MutatingUseContext::Borrow
| MutatingUseContext::Drop
| MutatingUseContext::Retag,
| MutatingUseContext::Drop,
)
| PlaceContext::NonMutatingUse(
NonMutatingUseContext::RawBorrow
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