| error[E0596]: cannot borrow `callback` as mutable, as it is not declared as mutable | |
| --> $DIR/mutation2.rs:9:5 | |
| | | |
| LL | my_var = true; | |
| | ------ calling `callback` requires mutable binding due to possible mutation of `my_var` | |
| LL | }; | |
| LL | callback(); | |
| | ^^^^^^^^ cannot borrow as mutable | |
| | | |
| help: consider changing this to be mutable | |
| | | |
| LL | let mut callback = use || { | |
| | +++ | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0596`. |