error[E0277]: `A` cannot be shared between threads safely
  --> $DIR/extern-types-not-sync-send.rs:23:5
   |
LL |     assert_sync::<A>();
   |     ^^^^^^^^^^^^^^^^ `A` cannot be shared between threads safely
   |
   = help: the trait `std::marker::Sync` is not implemented for `A`
note: required by `assert_sync`
  --> $DIR/extern-types-not-sync-send.rs:19:1
   |
LL | fn assert_sync<T: ?Sized + Sync>() { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: `A` cannot be sent between threads safely
  --> $DIR/extern-types-not-sync-send.rs:26:5
   |
LL |     assert_send::<A>();
   |     ^^^^^^^^^^^^^^^^ `A` cannot be sent between threads safely
   |
   = help: the trait `std::marker::Send` is not implemented for `A`
note: required by `assert_send`
  --> $DIR/extern-types-not-sync-send.rs:20:1
   |
LL | fn assert_send<T: ?Sized + Send>() { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.