| error[E0596]: cannot borrow `tick` as mutable, as it is not declared as mutable | |
| --> $DIR/unboxed-closures-infer-fnmut-missing-mut.rs:7:5 | |
| | | |
| LL | let tick = || counter += 1; | |
| | ---- help: consider changing this to be mutable: `mut tick` | |
| LL | tick(); | |
| | ^^^^ cannot borrow as mutable | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0596`. |