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diff --git a/tests/ui/nll/polonius/iterating-updating-cursor-issue-63908.polonius.stderr b/tests/ui/nll/polonius/iterating-updating-cursor-issue-63908.polonius.stderr
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+error[E0506]: cannot assign to `*node_ref` because it is borrowed
+  --> $DIR/iterating-updating-cursor-issue-63908.rs:43:5
+   |
+LL | fn remove_last_node_iterative<T>(mut node_ref: &mut List<T>) {
+   |                                                - let's call the lifetime of this reference `'1`
+LL |     loop {
+LL |         let next_ref = &mut node_ref.as_mut().unwrap().next;
+   |                             -------- `*node_ref` is borrowed here
+...
+LL |             node_ref = next_ref;
+   |             ------------------- assignment requires that `*node_ref` is borrowed for `'1`
+...
+LL |     *node_ref = None;
+   |     ^^^^^^^^^ `*node_ref` is assigned to here but it was already borrowed
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0506`.