| error[E0507]: cannot move out of `bar`, a captured variable in an `FnMut` closure |
| --> $DIR/borrowck-move-by-capture.rs:9:29 |
| | |
| LL | let bar: Box<_> = Box::new(3); |
| | --- ------ move occurs because `bar` has type `Box<isize>`, which does not implement the `Copy` trait |
| | | |
| | captured outer variable |
| LL | let _g = to_fn_mut(|| { |
| | -- captured by this `FnMut` closure |
| LL | let _h = to_fn_once(move || -> isize { *bar }); |
| | ^^^^^^^^^^^^^^^^ ---- variable moved due to use in closure |
| | | |
| | `bar` is moved here |
| | |
| help: `Fn` and `FnMut` closures require captured values to be able to be consumed multiple times, but `FnOnce` closures may consume them only once |
| --> $DIR/borrowck-move-by-capture.rs:3:37 |
| | |
| LL | fn to_fn_mut<A:std::marker::Tuple,F:FnMut<A>>(f: F) -> F { f } |
| | ^^^^^^^^ |
| help: consider cloning the value before moving it into the closure |
| | |
| LL ~ let value = bar.clone(); |
| LL ~ let _h = to_fn_once(move || -> isize { value }); |
| | |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0507`. |
