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error[E0594]: cannot assign to `y`, as it is not declared as mutable
--> $DIR/immutable-outer-variable.rs:14:25
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LL | foo(Box::new(use || y = !y) as Box<_>);
| ^^^^^^ cannot assign
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help: consider changing this to be mutable
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LL | let mut y = true;
| +++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0594`.
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