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rust/tests/ui/lint/unused/unused-async.stderr

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Consider `#[must_use]` annotation on `async fn` as also affecting the `Future::Output` No longer lint against `#[must_use] async fn foo()`. When encountering a statement that awaits on a `Future`, check if the `Future`'s parent item is annotated with `#[must_use]` and emit a lint if so. This effectively makes `must_use` an annotation on the `Future::Output` instead of only the `Future` itself. Fix #78149.
2022-08-16 09:56:42 -05:00
error: unused implementer of `Future` that must be used
--> $DIR/unused-async.rs:31:5
|
LL | foo();
| ^^^^^
|
Fix tests after rebase
2022-11-10 21:01:33 -06:00
= note: futures do nothing unless you `.await` or poll them
Consider `#[must_use]` annotation on `async fn` as also affecting the `Future::Output` No longer lint against `#[must_use] async fn foo()`. When encountering a statement that awaits on a `Future`, check if the `Future`'s parent item is annotated with `#[must_use]` and emit a lint if so. This effectively makes `must_use` an annotation on the `Future::Output` instead of only the `Future` itself. Fix #78149.
2022-08-16 09:56:42 -05:00
note: the lint level is defined here
--> $DIR/unused-async.rs:2:9
|
LL | #![deny(unused_must_use)]
| ^^^^^^^^^^^^^^^
error: unused return value of `foo` that must be used
--> $DIR/unused-async.rs:31:5
|
LL | foo();
| ^^^^^
error-msg: expand suggestion for unused lint
2023-03-10 23:28:05 -06:00
|
help: use `let _ = ...` to ignore the resulting value
|
LL | let _ = foo();
| +++++++
Consider `#[must_use]` annotation on `async fn` as also affecting the `Future::Output` No longer lint against `#[must_use] async fn foo()`. When encountering a statement that awaits on a `Future`, check if the `Future`'s parent item is annotated with `#[must_use]` and emit a lint if so. This effectively makes `must_use` an annotation on the `Future::Output` instead of only the `Future` itself. Fix #78149.
2022-08-16 09:56:42 -05:00
review comments
2022-08-17 10:21:43 -05:00
error: unused output of future returned by `foo` that must be used
Consider `#[must_use]` annotation on `async fn` as also affecting the `Future::Output` No longer lint against `#[must_use] async fn foo()`. When encountering a statement that awaits on a `Future`, check if the `Future`'s parent item is annotated with `#[must_use]` and emit a lint if so. This effectively makes `must_use` an annotation on the `Future::Output` instead of only the `Future` itself. Fix #78149.
2022-08-16 09:56:42 -05:00
--> $DIR/unused-async.rs:33:5
|
LL | foo().await;
| ^^^^^^^^^^^
error-msg: expand suggestion for unused lint
2023-03-10 23:28:05 -06:00
|
help: use `let _ = ...` to ignore the resulting value
|
LL | let _ = foo().await;
| +++++++
Consider `#[must_use]` annotation on `async fn` as also affecting the `Future::Output` No longer lint against `#[must_use] async fn foo()`. When encountering a statement that awaits on a `Future`, check if the `Future`'s parent item is annotated with `#[must_use]` and emit a lint if so. This effectively makes `must_use` an annotation on the `Future::Output` instead of only the `Future` itself. Fix #78149.
2022-08-16 09:56:42 -05:00
error: unused implementer of `Future` that must be used
--> $DIR/unused-async.rs:34:5
|
LL | bar();
| ^^^^^
|
= note: futures do nothing unless you `.await` or poll them
error: unused return value of `bar` that must be used
--> $DIR/unused-async.rs:34:5
|
LL | bar();
| ^^^^^
error-msg: expand suggestion for unused lint
2023-03-10 23:28:05 -06:00
|
help: use `let _ = ...` to ignore the resulting value
|
LL | let _ = bar();
| +++++++
Consider `#[must_use]` annotation on `async fn` as also affecting the `Future::Output` No longer lint against `#[must_use] async fn foo()`. When encountering a statement that awaits on a `Future`, check if the `Future`'s parent item is annotated with `#[must_use]` and emit a lint if so. This effectively makes `must_use` an annotation on the `Future::Output` instead of only the `Future` itself. Fix #78149.
2022-08-16 09:56:42 -05:00
error: unused implementer of `Future` that must be used
--> $DIR/unused-async.rs:37:5
|
LL | baz();
| ^^^^^
|
= note: futures do nothing unless you `.await` or poll them
Dont check `must_use` on nested `impl Future` from fn
2023-05-11 21:08:39 -05:00
error: aborting due to 6 previous errors
warn on must_use use on async fn's
2021-10-06 15:19:39 -05:00
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