| error[E0596]: cannot borrow data in a `&` reference as mutable | |
| --> $DIR/issue-52240.rs:9:27 | |
| | | |
| LL | if let (Some(Foo::Bar(ref mut val)), _) = (&arr.get(0), 0) { | |
| | ^^^^^^^^^^^ cannot borrow as mutable | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0596`. |