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Prevent the borrow counter from overflowing in Ref::clone

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Fixes #33880.
This commit is contained in:
Tobias Bucher 2016-05-30 09:53:09 +02:00
parent bf9c60c9a6
commit ef60c7cd49
1 changed files with 3 additions and 1 deletions
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4
src/libcore/cell.rs
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@ -618,7 +618,9 @@ fn clone(&self) -> BorrowRef<'b> {
// Since this Ref exists, we know the borrow flag // Since this Ref exists, we know the borrow flag
// is not set to WRITING. // is not set to WRITING.
let borrow = self.borrow.get(); let borrow = self.borrow.get();
debug_assert!(borrow != WRITING && borrow != UNUSED); debug_assert!(borrow != UNUSED);
// Prevent the borrow counter from overflowing.
assert!(borrow != WRITING);
self.borrow.set(borrow + 1); self.borrow.set(borrow + 1);
BorrowRef { borrow: self.borrow } BorrowRef { borrow: self.borrow }
} }