tests/ui/async-await/issue-68112.stderr

   1 error: future cannot be sent between threads safely
   2   --> $DIR/issue-68112.rs:34:5
   3    |
   4 LL |     require_send(send_fut);
   5    |     ^^^^^^^^^^^^ future created by async block is not `Send`
   6    |
   7    = help: the trait `Sync` is not implemented for `RefCell<i32>`
   8    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
   9 note: future is not `Send` as it awaits another future which is not `Send`
  10   --> $DIR/issue-68112.rs:31:17
  11    |
  12 LL |         let _ = non_send_fut.await;
  13    |                 ^^^^^^^^^^^^ await occurs here on type `impl Future<Output = Arc<RefCell<i32>>>`, which is not `Send`
  14 note: required by a bound in `require_send`
  15   --> $DIR/issue-68112.rs:11:25
  16    |
  17 LL | fn require_send(_: impl Send) {}
  18    |                         ^^^^ required by this bound in `require_send`
  19
  20 error: future cannot be sent between threads safely
  21   --> $DIR/issue-68112.rs:43:5
  22    |
  23 LL |     require_send(send_fut);
  24    |     ^^^^^^^^^^^^ future created by async block is not `Send`
  25    |
  26    = help: the trait `Sync` is not implemented for `RefCell<i32>`
  27    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
  28 note: future is not `Send` as it awaits another future which is not `Send`
  29   --> $DIR/issue-68112.rs:40:17
  30    |
  31 LL |         let _ = make_non_send_future1().await;
  32    |                 ^^^^^^^^^^^^^^^^^^^^^^^ await occurs here on type `impl Future<Output = Arc<RefCell<i32>>>`, which is not `Send`
  33 note: required by a bound in `require_send`
  34   --> $DIR/issue-68112.rs:11:25
  35    |
  36 LL | fn require_send(_: impl Send) {}
  37    |                         ^^^^ required by this bound in `require_send`
  38
  39 error[E0277]: `RefCell<i32>` cannot be shared between threads safely
  40   --> $DIR/issue-68112.rs:62:5
  41    |
  42 LL |     require_send(send_fut);
  43    |     ^^^^^^^^^^^^ `RefCell<i32>` cannot be shared between threads safely
  44    |
  45    = help: the trait `Sync` is not implemented for `RefCell<i32>`
  46    = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
  47    = note: required for `Arc<RefCell<i32>>` to implement `Send`
  48 note: required because it's used within this `async fn` body
  49   --> $DIR/issue-68112.rs:47:31
  50    |
  51 LL |   async fn ready2<T>(t: T) -> T {
  52    |  _______________________________^
  53 LL | |     t
  54 LL | | }
  55    | |_^
  56 note: required because it appears within the type `impl Future<Output = Arc<RefCell<i32>>>`
  57   --> $DIR/issue-68112.rs:50:31
  58    |
  59 LL | fn make_non_send_future2() -> impl Future<Output = Arc<RefCell<i32>>> {
  60    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  61    = note: required because it captures the following types: `impl Future<Output = Arc<RefCell<i32>>>`, `Ready<i32>`
  62 note: required because it's used within this `async` block
  63   --> $DIR/issue-68112.rs:57:20
  64    |
  65 LL |       let send_fut = async {
  66    |  ____________________^
  67 LL | |         let non_send_fut = make_non_send_future2();
  68 LL | |         let _ = non_send_fut.await;
  69 LL | |         ready(0).await;
  70 LL | |     };
  71    | |_____^
  72 note: required by a bound in `require_send`
  73   --> $DIR/issue-68112.rs:11:25
  74    |
  75 LL | fn require_send(_: impl Send) {}
  76    |                         ^^^^ required by this bound in `require_send`
  77
  78 error: aborting due to 3 previous errors
  79
  80 For more information about this error, try `rustc --explain E0277`.