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error[E0596]: cannot borrow `callback` as mutable, as it is not declared as mutable
--> $DIR/issue-80313-mutation-in-closure.rs:6:5
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LL | let callback = || {
| -------- help: consider changing this to be mutable: `mut callback`
LL | my_var = true;
| ------ calling `callback` requires mutable binding due to mutable borrow of `my_var`
LL | };
LL | callback();
| ^^^^^^^^ cannot borrow as mutable
error: aborting due to previous error
For more information about this error, try `rustc --explain E0596`.
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