error: coroutine cannot be shared between threads safely
  --> $DIR/not-send-sync.rs:14:5
   |
LL |     assert_sync(|| {
   |     ^^^^^^^^^^^ coroutine is not `Sync`
   |
   = help: within `{coroutine@$DIR/not-send-sync.rs:14:17: 14:19}`, the trait `Sync` is not implemented for `NotSync`
note: coroutine is not `Sync` as this value is used across a yield
  --> $DIR/not-send-sync.rs:17:9
   |
LL |         let a = NotSync;
   |             - has type `NotSync` which is not `Sync`
LL |         yield;
   |         ^^^^^ yield occurs here, with `a` maybe used later
note: required by a bound in `assert_sync`
  --> $DIR/not-send-sync.rs:11:23
   |
LL |     fn assert_sync<T: Sync>(_: T) {}
   |                       ^^^^ required by this bound in `assert_sync`

error: coroutine cannot be sent between threads safely
  --> $DIR/not-send-sync.rs:21:5
   |
LL |     assert_send(|| {
   |     ^^^^^^^^^^^ coroutine is not `Send`
   |
   = help: within `{coroutine@$DIR/not-send-sync.rs:21:17: 21:19}`, the trait `Send` is not implemented for `NotSend`
note: coroutine is not `Send` as this value is used across a yield
  --> $DIR/not-send-sync.rs:24:9
   |
LL |         let a = NotSend;
   |             - has type `NotSend` which is not `Send`
LL |         yield;
   |         ^^^^^ yield occurs here, with `a` maybe used later
note: required by a bound in `assert_send`
  --> $DIR/not-send-sync.rs:12:23
   |
LL |     fn assert_send<T: Send>(_: T) {}
   |                       ^^^^ required by this bound in `assert_send`

error: aborting due to 2 previous errors