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:16:17
   3    |
   4 LL |       assert_send(|| {
   5    |  _____-----------_^
   6    | |     |
   7    | |     required by a bound introduced by this call
   8 LL | |
   9 LL | |         drop(&a);
  10 LL | |         yield;
  11 LL | |     });
  12    | |_____^ `Cell<i32>` cannot be shared between threads safely
  13    |
  14    = help: the trait `Sync` is not implemented for `Cell<i32>`
  15    = note: required for `&Cell<i32>` to implement `Send`
  16 note: required because it's used within this generator
  17   --> $DIR/not-send-sync.rs:16:17
  18    |
  19 LL |     assert_send(|| {
  20    |                 ^^
  21 note: required by a bound in `assert_send`
  22   --> $DIR/not-send-sync.rs:7:23
  23    |
  24 LL |     fn assert_send<T: Send>(_: T) {}
  25    |                       ^^^^ required by this bound in `assert_send`
  26
  27 error: generator cannot be shared between threads safely
  28   --> $DIR/not-send-sync.rs:9:17
  29    |
  30 LL |       assert_sync(|| {
  31    |  _________________^
  32 LL | |
  33 LL | |         let a = Cell::new(2);
  34 LL | |         yield;
  35 LL | |     });
  36    | |_____^ generator is not `Sync`
  37    |
  38    = help: within `[generator@$DIR/not-send-sync.rs:9:17: 9:19]`, the trait `Sync` is not implemented for `Cell<i32>`
  39 note: generator is not `Sync` as this value is used across a yield
  40   --> $DIR/not-send-sync.rs:12:9
  41    |
  42 LL |         let a = Cell::new(2);
  43    |             - has type `Cell<i32>` which is not `Sync`
  44 LL |         yield;
  45    |         ^^^^^ yield occurs here, with `a` maybe used later
  46 LL |     });
  47    |     - `a` is later dropped here
  48 note: required by a bound in `assert_sync`
  49   --> $DIR/not-send-sync.rs:6:23
  50    |
  51 LL |     fn assert_sync<T: Sync>(_: T) {}
  52    |                       ^^^^ required by this bound in `assert_sync`
  53
  54 error: aborting due to 2 previous errors
  55
  56 For more information about this error, try `rustc --explain E0277`.