error: generator cannot be shared between threads safely
  --> $DIR/not-send-sync.rs:17:17
   |
LL |       assert_sync(|| {
   |  _________________^
LL | |
LL | |         let a = NotSync;
LL | |         yield;
LL | |         drop(a);
LL | |     });
   | |_____^ generator is not `Sync`
   |
   = help: within `[generator@$DIR/not-send-sync.rs:17:17: 17:19]`, the trait `Sync` is not implemented for `NotSync`
   = note: consider using `std::sync::Arc<NotSync>`; for more information visit <https://doc.rust-lang.org/book/ch16-03-shared-state.html>
note: generator is not `Sync` as this value is used across a yield
  --> $DIR/not-send-sync.rs:20:9
   |
LL |         let a = NotSync;
   |             - has type `NotSync` which is not `Sync`
LL |         yield;
   |         ^^^^^ yield occurs here, with `a` maybe used later
LL |         drop(a);
LL |     });
   |     - `a` is later dropped here
note: required by a bound in `assert_sync`
  --> $DIR/not-send-sync.rs:14:23
   |
LL |     fn assert_sync<T: Sync>(_: T) {}
   |                       ^^^^ required by this bound in `assert_sync`

error: generator cannot be sent between threads safely
  --> $DIR/not-send-sync.rs:24:17
   |
LL |       assert_send(|| {
   |  _________________^
LL | |
LL | |         let a = NotSend;
LL | |         yield;
LL | |         drop(a);
LL | |     });
   | |_____^ generator is not `Send`
   |
   = help: within `[generator@$DIR/not-send-sync.rs:24:17: 24:19]`, the trait `Send` is not implemented for `NotSend`
   = note: consider using `std::sync::Arc<NotSend>`; for more information visit <https://doc.rust-lang.org/book/ch16-03-shared-state.html>
note: generator is not `Send` as this value is used across a yield
  --> $DIR/not-send-sync.rs:27:9
   |
LL |         let a = NotSend;
   |             - has type `NotSend` which is not `Send`
LL |         yield;
   |         ^^^^^ yield occurs here, with `a` maybe used later
LL |         drop(a);
LL |     });
   |     - `a` is later dropped here
note: required by a bound in `assert_send`
  --> $DIR/not-send-sync.rs:15:23
   |
LL |     fn assert_send<T: Send>(_: T) {}
   |                       ^^^^ required by this bound in `assert_send`

error: aborting due to 2 previous errors