src/test/ui/async-await/async-fn-nonsend.stderr

   1 error: future cannot be sent between threads safely
   2   --> $DIR/async-fn-nonsend.rs:49:17
   3    |
   4 LL |     assert_send(local_dropped_before_await());
   5    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `local_dropped_before_await` is not `Send`
   6    |
   7    = help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
   8 note: future is not `Send` as this value is used across an await
   9   --> $DIR/async-fn-nonsend.rs:24:5
  10    |
  11 LL |     let x = non_send();
  12    |         - has type `impl Debug` which is not `Send`
  13 LL |     drop(x);
  14 LL |     fut().await;
  15    |     ^^^^^^^^^^^ await occurs here, with `x` maybe used later
  16 LL | }
  17    | - `x` is later dropped here
  18 note: required by a bound in `assert_send`
  19   --> $DIR/async-fn-nonsend.rs:46:24
  20    |
  21 LL | fn assert_send(_: impl Send) {}
  22    |                        ^^^^ required by this bound in `assert_send`
  23
  24 error: future cannot be sent between threads safely
  25   --> $DIR/async-fn-nonsend.rs:51:17
  26    |
  27 LL |     assert_send(non_send_temporary_in_match());
  28    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `non_send_temporary_in_match` is not `Send`
  29    |
  30    = help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`
  31 note: future is not `Send` as this value is used across an await
  32   --> $DIR/async-fn-nonsend.rs:33:20
  33    |
  34 LL |     match Some(non_send()) {
  35    |                ---------- has type `impl Debug` which is not `Send`
  36 LL |         Some(_) => fut().await,
  37    |                    ^^^^^^^^^^^ await occurs here, with `non_send()` maybe used later
  38 ...
  39 LL | }
  40    | - `non_send()` is later dropped here
  41 note: required by a bound in `assert_send`
  42   --> $DIR/async-fn-nonsend.rs:46:24
  43    |
  44 LL | fn assert_send(_: impl Send) {}
  45    |                        ^^^^ required by this bound in `assert_send`
  46
  47 error: future cannot be sent between threads safely
  48   --> $DIR/async-fn-nonsend.rs:53:17
  49    |
  50 LL |     assert_send(non_sync_with_method_call());
  51    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `non_sync_with_method_call` is not `Send`
  52    |
  53    = help: the trait `Send` is not implemented for `dyn std::fmt::Write`
  54 note: future is not `Send` as this value is used across an await
  55   --> $DIR/async-fn-nonsend.rs:42:9
  56    |
  57 LL |     let f: &mut std::fmt::Formatter = panic!();
  58    |         - has type `&mut Formatter<'_>` which is not `Send`
  59 LL |     if non_sync().fmt(f).unwrap() == () {
  60 LL |         fut().await;
  61    |         ^^^^^^^^^^^ await occurs here, with `f` maybe used later
  62 LL |     }
  63 LL | }
  64    | - `f` is later dropped here
  65 note: required by a bound in `assert_send`
  66   --> $DIR/async-fn-nonsend.rs:46:24
  67    |
  68 LL | fn assert_send(_: impl Send) {}
  69    |                        ^^^^ required by this bound in `assert_send`
  70
  71 error: aborting due to 3 previous errors
  72