src/test/ui/generator/not-send-sync.stderr

   1 error[E0277]: `Cell<i32>` cannot be shared between threads safely
   2   --> $DIR/not-send-sync.rs:16:5
   3    |
   4 LL |     fn assert_send<T: Send>(_: T) {}
   5    |                       ---- required by this bound in `assert_send`
   6 ...
   7 LL |     assert_send(|| {
   8    |     ^^^^^^^^^^^ `Cell<i32>` cannot be shared between threads safely
   9    |
  10    = help: the trait `Sync` is not implemented for `Cell<i32>`
  11    = note: required because of the requirements on the impl of `Send` for `&Cell<i32>`
  12    = note: required because it appears within the type `[generator@$DIR/not-send-sync.rs:16:17: 20:6]`
  13
  14 error: generator cannot be shared between threads safely
  15   --> $DIR/not-send-sync.rs:9:5
  16    |
  17 LL |     fn assert_sync<T: Sync>(_: T) {}
  18    |                       ---- required by this bound in `assert_sync`
  19 ...
  20 LL |     assert_sync(|| {
  21    |     ^^^^^^^^^^^ generator is not `Sync`
  22    |
  23    = help: within `[generator@$DIR/not-send-sync.rs:9:17: 13:6]`, the trait `Sync` is not implemented for `Cell<i32>`
  24 note: generator is not `Sync` as this value is used across a yield
  25   --> $DIR/not-send-sync.rs:12:9
  26    |
  27 LL |         let a = Cell::new(2);
  28    |             - has type `Cell<i32>` which is not `Sync`
  29 LL |         yield;
  30    |         ^^^^^ yield occurs here, with `a` maybe used later
  31 LL |     });
  32    |     - `a` is later dropped here
  33
  34 error: aborting due to 2 previous errors
  35
  36 For more information about this error, try `rustc --explain E0277`.