| error[E0277]: `std::cell::Cell<i32>` cannot be shared between threads safely |
| --> $DIR/not-send-sync.rs:16:5 |
| | |
| LL | fn assert_send<T: Send>(_: T) {} |
| | ---- required by this bound in `main::assert_send` |
| ... |
| LL | assert_send(|| { |
| | ^^^^^^^^^^^ `std::cell::Cell<i32>` cannot be shared between threads safely |
| | |
| = help: the trait `std::marker::Sync` is not implemented for `std::cell::Cell<i32>` |
| = note: required because of the requirements on the impl of `std::marker::Send` for `&std::cell::Cell<i32>` |
| = note: required because it appears within the type `[generator@$DIR/not-send-sync.rs:16:17: 20:6 a:&std::cell::Cell<i32> _]` |
| |
| error: generator cannot be shared between threads safely |
| --> $DIR/not-send-sync.rs:9:5 |
| | |
| LL | fn assert_sync<T: Sync>(_: T) {} |
| | ---- required by this bound in `main::assert_sync` |
| ... |
| LL | assert_sync(|| { |
| | ^^^^^^^^^^^ generator is not `Sync` |
| | |
| = help: within `[generator@$DIR/not-send-sync.rs:9:17: 13:6 {std::cell::Cell<i32>, ()}]`, the trait `std::marker::Sync` is not implemented for `std::cell::Cell<i32>` |
| note: generator is not `Sync` as this value is used across a yield |
| --> $DIR/not-send-sync.rs:12:9 |
| | |
| LL | let a = Cell::new(2); |
| | - has type `std::cell::Cell<i32>` which is not `Sync` |
| LL | yield; |
| | ^^^^^ yield occurs here, with `a` maybe used later |
| LL | }); |
| | - `a` is later dropped here |
| |
| error: aborting due to 2 previous errors |
| |
| For more information about this error, try `rustc --explain E0277`. |