diff options
| -rw-r--r-- | src/libcore/cell.rs | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs index 4929088201d..97a85f6aa43 100644 --- a/src/libcore/cell.rs +++ b/src/libcore/cell.rs @@ -618,7 +618,9 @@ impl<'b> Clone for BorrowRef<'b> { // Since this Ref exists, we know the borrow flag // is not set to WRITING. 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); BorrowRef { borrow: self.borrow } } |