| error[E0499]: cannot borrow `y.0` as mutable more than once at a time | |
| --> $DIR/borrowck-anon-fields-tuple.rs:27:10 | |
| | | |
| LL | (ref mut a, _) => a | |
| | --------- first mutable borrow occurs here | |
| ... | |
| LL | (ref mut b, _) => b | |
| | ^^^^^^^^^ second mutable borrow occurs here | |
| ... | |
| LL | *a += 1; | |
| | ------- first borrow later used here | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0499`. |