6efddac288
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
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6 | <i32 as Foo>::foo();
| ^^^ the trait `Bar` is not implemented for `i32`, which is required by `i32: Foo`
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help: this trait has no implementations, consider adding one
--> f100.rs:2:1
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2 | trait Bar {}
| ^^^^^^^^^
note: required for `i32` to implement `Foo`
--> f100.rs:3:14
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3 | impl<T: Bar> Foo for T {}
| --- ^^^ ^
| |
| unsatisfied trait bound introduced here
```
Fix #40120.
101 lines
3.9 KiB
Plaintext
101 lines
3.9 KiB
Plaintext
error: future cannot be sent between threads safely
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--> $DIR/async-await-let-else.rs:45:13
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LL | is_send(foo(Some(true)));
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| ^^^^^^^^^^^^^^^ future returned by `foo` is not `Send`
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= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`, which is required by `impl Future<Output = ()>: Send`
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note: future is not `Send` as this value is used across an await
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--> $DIR/async-await-let-else.rs:8:15
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LL | let r = Rc::new(());
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| - has type `Rc<()>` which is not `Send`
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LL | bar().await
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| ^^^^^ await occurs here, with `r` maybe used later
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note: required by a bound in `is_send`
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--> $DIR/async-await-let-else.rs:16:15
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LL | fn is_send<T: Send>(_: T) {}
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| ^^^^ required by this bound in `is_send`
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error[E0277]: `Rc<()>` cannot be sent between threads safely
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--> $DIR/async-await-let-else.rs:47:13
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LL | async fn foo2(x: Option<bool>) {
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| ------------------------------ within this `impl Future<Output = ()>`
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...
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LL | is_send(foo2(Some(true)));
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| ------- ^^^^^^^^^^^^^^^^ `Rc<()>` cannot be sent between threads safely
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| required by a bound introduced by this call
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= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`, which is required by `impl Future<Output = ()>: Send`
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note: required because it's used within this `async` fn body
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--> $DIR/async-await-let-else.rs:24:29
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LL | async fn bar2<T>(_: T) -> ! {
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| _____________________________^
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LL | | panic!()
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LL | | }
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| |_^
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= note: required because it captures the following types: `impl Future<Output = !>`
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note: required because it's used within this `async` fn body
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--> $DIR/async-await-let-else.rs:18:32
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LL | async fn foo2(x: Option<bool>) {
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| ________________________________^
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LL | | let Some(_) = x else {
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LL | | bar2(Rc::new(())).await
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LL | | };
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LL | | }
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| |_^
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note: required by a bound in `is_send`
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--> $DIR/async-await-let-else.rs:16:15
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LL | fn is_send<T: Send>(_: T) {}
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| ^^^^ required by this bound in `is_send`
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error: future cannot be sent between threads safely
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--> $DIR/async-await-let-else.rs:49:13
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LL | is_send(foo3(Some(true)));
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| ^^^^^^^^^^^^^^^^ future returned by `foo3` is not `Send`
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= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`, which is required by `impl Future<Output = ()>: Send`
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note: future is not `Send` as this value is used across an await
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--> $DIR/async-await-let-else.rs:30:29
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LL | (Rc::new(()), bar().await);
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| ----------- ^^^^^ await occurs here, with `Rc::new(())` maybe used later
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| has type `Rc<()>` which is not `Send`
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note: required by a bound in `is_send`
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--> $DIR/async-await-let-else.rs:16:15
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LL | fn is_send<T: Send>(_: T) {}
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| ^^^^ required by this bound in `is_send`
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error: future cannot be sent between threads safely
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--> $DIR/async-await-let-else.rs:51:13
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LL | is_send(foo4(Some(true)));
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| ^^^^^^^^^^^^^^^^ future returned by `foo4` is not `Send`
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= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `Rc<()>`, which is required by `impl Future<Output = ()>: Send`
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note: future is not `Send` as this value is used across an await
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--> $DIR/async-await-let-else.rs:38:15
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LL | let r = Rc::new(());
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| - has type `Rc<()>` which is not `Send`
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LL | bar().await;
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| ^^^^^ await occurs here, with `r` maybe used later
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note: required by a bound in `is_send`
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--> $DIR/async-await-let-else.rs:16:15
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LL | fn is_send<T: Send>(_: T) {}
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| ^^^^ required by this bound in `is_send`
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error: aborting due to 4 previous errors
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For more information about this error, try `rustc --explain E0277`.
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