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