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Extend comment in UsedLocals::visit_lhs

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Tomasz Miąsko 2021-03-20 00:00:00 +00:00
parent 41b315a470
commit 43cadc99b7
1 changed files with 3 additions and 1 deletions
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4
compiler/rustc_mir/src/transform/simplify.rs
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@ -422,7 +422,9 @@ impl UsedLocals<'tcx> {
// A use, not a definition. // A use, not a definition.
self.visit_place(place, PlaceContext::MutatingUse(MutatingUseContext::Store), location); self.visit_place(place, PlaceContext::MutatingUse(MutatingUseContext::Store), location);
} else { } else {
// A definition. Although, it still might use other locals for indexing. // A definition. The base local itself is not visited, so this occurrence is not counted
// toward its use count. There might be other locals still, used in an indexing
// projection.
self.super_projection( self.super_projection(
place.as_ref(), place.as_ref(),
PlaceContext::MutatingUse(MutatingUseContext::Projection), PlaceContext::MutatingUse(MutatingUseContext::Projection),