| error[E0499]: cannot borrow `foo` as mutable more than once at a time | |
| --> $DIR/hrtb-debruijn-in-receiver.rs:17:5 | |
| | | |
| LL | foo.insert(); | |
| | --- first mutable borrow occurs here | |
| LL | foo.insert(); | |
| | ^^^ | |
| | | | |
| | second mutable borrow occurs here | |
| | first borrow later used here | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0499`. |