| 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 | |
| | | |
| 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 1 previous error | |
| For more information about this error, try `rustc --explain E0594`. |