rust/tests/ui/traits/unsend-future.stderr
Esteban Küber 6efddac288 Provide more context on derived obligation error primary label
Expand the primary span of E0277 when the immediate unmet bound is not what the user wrote:

```
error[E0277]: the trait bound `i32: Bar` is not satisfied
 --> f100.rs:6:6
  |
6 |     <i32 as Foo>::foo();
  |      ^^^ the trait `Bar` is not implemented for `i32`, which is required by `i32: Foo`
  |
help: this trait has no implementations, consider adding one
 --> f100.rs:2:1
  |
2 | trait Bar {}
  | ^^^^^^^^^
note: required for `i32` to implement `Foo`
 --> f100.rs:3:14
  |
3 | impl<T: Bar> Foo for T {}
  |         ---  ^^^     ^
  |         |
  |         unsatisfied trait bound introduced here
```

Fix #40120.
2024-01-30 21:28:18 +00:00

23 lines
923 B
Plaintext

error: future cannot be sent between threads safely
--> $DIR/unsend-future.rs:20:21
|
LL | require_handler(handler)
| ^^^^^^^ future returned by `handler` is not `Send`
|
= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `*const i32`, which is required by `fn() -> impl Future<Output = ()> {handler}: Handler`
note: future is not `Send` as this value is used across an await
--> $DIR/unsend-future.rs:15:14
|
LL | let a = &1 as *const i32;
| - has type `*const i32` which is not `Send`
LL | async {}.await;
| ^^^^^ await occurs here, with `a` maybe used later
note: required by a bound in `require_handler`
--> $DIR/unsend-future.rs:11:23
|
LL | fn require_handler<H: Handler>(h: H) {}
| ^^^^^^^ required by this bound in `require_handler`
error: aborting due to 1 previous error