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

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