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error[E0594]: cannot assign to `x`, as it is a captured variable in a `Fn` closure
--> $DIR/borrow-immutable-upvar-mutation-impl-trait.rs:11:9
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LL | fn bar() -> impl Fn() -> usize {
| --- ------------------ change this to return `FnMut` instead of `Fn`
LL | let mut x = 0;
LL | move || {
| ------- in this closure
LL | x += 1;
| ^^^^^^ cannot assign
error: aborting due to previous error
For more information about this error, try `rustc --explain E0594`.
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