1 error[E0594]: cannot assign to `counter`, as it is a captured variable in a `Fn` closure
2 --> $DIR/unboxed-closures-mutated-upvar-from-fn-closure.rs:24:9
5 | ^^^^^^^^^^^^ cannot assign
7 help: consider changing this to accept closures that implement `FnMut`
8 --> $DIR/unboxed-closures-mutated-upvar-from-fn-closure.rs:23:10
13 LL | | //[ast]~^ ERROR cannot assign to data in a captured outer variable in an `Fn` closure
14 LL | | //[mir]~^^ ERROR cannot assign to `counter`
18 error: aborting due to previous error
20 For more information about this error, try `rustc --explain E0594`.