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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.
37 lines
1.6 KiB
Plaintext
37 lines
1.6 KiB
Plaintext
error[E0277]: the type `&mut Context<'_>` may not be safely transferred across an unwind boundary
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--> $DIR/async-is-unwindsafe.rs:12:5
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LL | is_unwindsafe(async {
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| _____^_____________-
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| |_____|
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| ||
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LL | ||
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LL | || use std::ptr::null;
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LL | || use std::task::{Context, RawWaker, RawWakerVTable, Waker};
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... ||
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LL | || drop(cx_ref);
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LL | || });
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| ||_____-^ `&mut Context<'_>` may not be safely transferred across an unwind boundary
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| |_____|
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| within this `{async block@$DIR/async-is-unwindsafe.rs:12:19: 29:6}`
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= help: within `{async block@$DIR/async-is-unwindsafe.rs:12:19: 29:6}`, the trait `UnwindSafe` is not implemented for `&mut Context<'_>`, which is required by `{async block@$DIR/async-is-unwindsafe.rs:12:19: 29:6}: UnwindSafe`
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= note: `UnwindSafe` is implemented for `&Context<'_>`, but not for `&mut Context<'_>`
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note: future does not implement `UnwindSafe` as this value is used across an await
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--> $DIR/async-is-unwindsafe.rs:25:18
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LL | let cx_ref = &mut cx;
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| ------ has type `&mut Context<'_>` which does not implement `UnwindSafe`
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LL |
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LL | async {}.await; // this needs an inner await point
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| ^^^^^ await occurs here, with `cx_ref` maybe used later
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note: required by a bound in `is_unwindsafe`
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--> $DIR/async-is-unwindsafe.rs:3:26
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LL | fn is_unwindsafe(_: impl std::panic::UnwindSafe) {}
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| ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `is_unwindsafe`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0277`.
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