| error[E0502]: cannot borrow `*a` as mutable because it is also borrowed as immutable | |
| --> $DIR/E0502.rs:4:9 | |
| | | |
| LL | let ref y = a; | |
| | ----- immutable borrow occurs here | |
| LL | bar(a); | |
| | ^ mutable borrow occurs here | |
| LL | y.use_ref(); | |
| | - immutable borrow later used here | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0502`. |