| error[E0594]: cannot assign to `y`, as it is not declared as mutable | |
| --> $DIR/closure-immutable-outer-variable.rs:11:26 | |
| | | |
| LL | let y = true; | |
| | - help: consider changing this to be mutable: `mut y` | |
| LL | foo(Box::new(move || y = false) as Box<_>); | |
| | ^^^^^^^^^ cannot assign | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0594`. |