error[E0597]: `*cell` does not live long enough --> $DIR/dropck.rs:10:40 | LL | let (mut gen, cell); | ---- binding `cell` declared here LL | cell = Box::new(RefCell::new(0)); LL | let ref_ = Box::leak(Box::new(Some(cell.borrow_mut()))); | ^^^^ borrowed value does not live long enough ... LL | } | - | | | `*cell` dropped here while still borrowed | borrow might be used here, when `gen` is dropped and runs the destructor for coroutine | = note: values in a scope are dropped in the opposite order they are defined error[E0597]: `ref_` does not live long enough --> $DIR/dropck.rs:15:18 | LL | gen = || { | -- value captured here by coroutine LL | // but the coroutine can use it to drop a `Ref<'a, i32>`. LL | let _d = ref_.take(); | ^^^^ borrowed value does not live long enough ... LL | } | - | | | `ref_` dropped here while still borrowed | borrow might be used here, when `gen` is dropped and runs the destructor for coroutine | = note: values in a scope are dropped in the opposite order they are defined error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0597`.