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