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deduce_param_attrs: explain a read-only case

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Ralf Jung 2023-10-30 10:29:08 +01:00
parent 91bbdd927a
commit 3f7e50696f
1 changed files with 1 additions and 0 deletions
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compiler/rustc_mir_transform/src/deduce_param_attrs.rs
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@ -44,6 +44,7 @@ fn visit_place(&mut self, place: &Place<'tcx>, context: PlaceContext, _location:
// Whether mutating though a `&raw const` is allowed is still undecided, so we // Whether mutating though a `&raw const` is allowed is still undecided, so we
// disable any sketchy `readonly` optimizations for now. // disable any sketchy `readonly` optimizations for now.
// But we only need to do this if the pointer would point into the argument. // But we only need to do this if the pointer would point into the argument.
// IOW: for indirect places, like `&raw (*local).field`, this surely cannot mutate `local`.
!place.is_indirect() !place.is_indirect()
} }
PlaceContext::NonMutatingUse(..) | PlaceContext::NonUse(..) => { PlaceContext::NonMutatingUse(..) | PlaceContext::NonUse(..) => {