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-rw-r--r--tests/lean/NoNestedBorrows.lean12
1 files changed, 7 insertions, 5 deletions
diff --git a/tests/lean/NoNestedBorrows.lean b/tests/lean/NoNestedBorrows.lean
index c4a6a265..79049837 100644
--- a/tests/lean/NoNestedBorrows.lean
+++ b/tests/lean/NoNestedBorrows.lean
@@ -151,11 +151,13 @@ def test_list1 : Result Unit :=
/- [no_nested_borrows::test_box1]: forward function -/
def test_box1 : Result Unit :=
- let b := 1#i32
- let x := b
- if not (x = 1#i32)
- then Result.fail Error.panic
- else Result.ret ()
+ do
+ let b := 0#i32
+ let b0 ← alloc.boxed.Box.deref_mut_back I32 b 1#i32
+ let x ← alloc.boxed.Box.deref I32 b0
+ if not (x = 1#i32)
+ then Result.fail Error.panic
+ else Result.ret ()
/- Unit test for [no_nested_borrows::test_box1] -/
#assert (test_box1 == .ret ())