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Avoid an is_empty() followed by an index op in favor of a single fallible op

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This commit is contained in:
Oli Scherer 2024-04-02 14:13:05 +00:00
parent b4993c47f2
commit 6f3cc0903c
1 changed files with 3 additions and 3 deletions
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6
compiler/rustc_mir_transform/src/coroutine/by_move_body.rs
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@ -89,11 +89,11 @@ impl<'tcx> MutVisitor<'tcx> for MakeByMoveBody<'tcx> {
location: mir::Location,
) {
if place.local == ty::CAPTURE_STRUCT_LOCAL
&& !place.projection.is_empty()
&& let mir::ProjectionElem::Field(idx, ty) = place.projection[0]
&& let Some((&mir::ProjectionElem::Field(idx, ty), projection)) =
place.projection.split_first()
&& self.by_ref_fields.contains(&idx)
{
let (begin, end) = place.projection[1..].split_first().unwrap();
let (begin, end) = projection.split_first().unwrap();
// FIXME(async_closures): I'm actually a bit surprised to see that we always
// initially deref the by-ref upvars. If this is not actually true, then we
// will at least get an ICE that explains why this isn't true :^)