1 error[E0596]: cannot borrow immutable local variable `tick` as mutable
2 --> $DIR/unboxed-closures-infer-fnmut-missing-mut.rs:17:5
4 LL | let tick = || counter += 1;
5 | ---- help: make this binding mutable: `mut tick`
6 LL | tick(); //~ ERROR cannot borrow immutable local variable `tick` as mutable
7 | ^^^^ cannot borrow mutably
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.