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EndRegion do not always correspond to borrow-data entries #44987

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Merged
merged 1 commit into from
Oct 5, 2017
Merged

EndRegion do not always correspond to borrow-data entries #44987

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10 changes: 5 additions & 5 deletions src/librustc_mir/dataflow/impls/borrows.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -122,11 +122,11 @@ impl<'a, 'tcx> BitDenotation for Borrows<'a, 'tcx> {
});
match stmt.kind {
mir::StatementKind::EndRegion(region_scope) => {
let borrow_indexes = self.region_map.get(&ReScope(region_scope)).unwrap_or_else(|| {
panic!("could not find BorrowIndexs for region scope {:?}", region_scope);
});

for idx in borrow_indexes { sets.kill(&idx); }
if let Some(borrow_indexes) = self.region_map.get(&ReScope(region_scope)) {
for idx in borrow_indexes { sets.kill(&idx); }
} else {
// (if there is no entry, then there are no borrows to be tracked)
}
}

mir::StatementKind::Assign(_, ref rhs) => {
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