error[E0382]: borrow of moved value: `g` --> $DIR/issue-105084.rs:45:14 | LL | let mut g = || { | ----- move occurs because `g` has type `[generator@$DIR/issue-105084.rs:22:17: 22:19]`, which does not implement the `Copy` trait ... LL | let mut h = copy(g); | - value moved here ... LL | Pin::new(&mut g).resume(()); | ^^^^^^ value borrowed here after move | note: consider changing this parameter type in function `copy` to borrow instead if owning the value isn't necessary --> $DIR/issue-105084.rs:17:21 | LL | fn copy(x: T) -> T { | ---- ^ this parameter takes ownership of the value | | | in this function help: consider cloning the value if the performance cost is acceptable | LL | let mut h = copy(g.clone()); | ++++++++ error[E0277]: the trait bound `Box<(i32, ())>: Copy` is not satisfied in `[generator@$DIR/issue-105084.rs:22:17: 22:19]` --> $DIR/issue-105084.rs:39:17 | LL | let mut g = || { | -- within this `[generator@$DIR/issue-105084.rs:22:17: 22:19]` ... LL | let mut h = copy(g); | ^^^^ within `[generator@$DIR/issue-105084.rs:22:17: 22:19]`, the trait `Copy` is not implemented for `Box<(i32, ())>` | note: generator does not implement `Copy` as this value is used across a yield --> $DIR/issue-105084.rs:29:22 | LL | Box::new((5, yield)); | -------------^^^^^-- | | | | | yield occurs here, with `Box::new((5, yield))` maybe used later | has type `Box<(i32, ())>` which does not implement `Copy` note: required by a bound in `copy` --> $DIR/issue-105084.rs:17:12 | LL | fn copy(x: T) -> T { | ^^^^ required by this bound in `copy` error: aborting due to 2 previous errors Some errors have detailed explanations: E0277, E0382. For more information about an error, try `rustc --explain E0277`.