error[E0507]: cannot move out of `i`, a captured variable in an `Fn` closure --> $DIR/moves-based-on-type-move-out-of-closure-env-issue-1965.rs:9:28 | LL | let i = box 3; | - captured outer variable LL | let _f = to_fn(|| test(i)); | ^ move occurs because `i` has type `Box`, which does not implement the `Copy` trait error: aborting due to previous error For more information about this error, try `rustc --explain E0507`.