1 error[E0596]: cannot borrow `tick` as mutable, as it is not declared as mutable
2 --> $DIR/unboxed-closures-infer-fnmut-move-missing-mut.rs:7:5
4 LL | let tick = move || counter += 1;
5 | ------- calling `tick` requires mutable binding due to possible mutation of `counter`
7 | ^^^^ cannot borrow as mutable
9 help: consider changing this to be mutable
11 LL | let mut tick = move || counter += 1;
14 error: aborting due to previous error
16 For more information about this error, try `rustc --explain E0596`.