1error[E0596]: cannot borrow `key` as mutable, as it is not declared as mutable
2  --> $DIR/issue-34337.rs:6:9
3   |
4LL |     get(&mut key);
5   |         ^^^^^^^^
6   |         |
7   |         cannot borrow as mutable
8   |         help: try removing `&mut` here
9
10error: aborting due to previous error
11
12For more information about this error, try `rustc --explain E0596`.
13