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deduce_param_attrs: explain a read-only case #117385

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Oct 30, 2023
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deduce_param_attrs: explain a read-only case #117385

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1 change: 1 addition & 0 deletions compiler/rustc_mir_transform/src/deduce_param_attrs.rs
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Expand Up @@ -44,6 +44,7 @@ impl<'tcx> Visitor<'tcx> for DeduceReadOnly {
// Whether mutating though a `&raw const` is allowed is still undecided, so we
// disable any sketchy `readonly` optimizations for now.
// 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()
}
PlaceContext::NonMutatingUse(..) | PlaceContext::NonUse(..) => {
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