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Enforce must_use on associated types and RPITITs
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,15 @@ | ||
error: unused implementer of `Future` that must be used | ||
--> $DIR/assoc-types.rs:19:5 | ||
| | ||
LL | T::foo(); | ||
| ^^^^^^^^ | ||
| | ||
= note: futures do nothing unless you `.await` or poll them | ||
note: the lint level is defined here | ||
--> $DIR/assoc-types.rs:4:9 | ||
| | ||
LL | #![deny(unused_must_use)] | ||
| ^^^^^^^^^^^^^^^ | ||
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||
error: aborting due to 1 previous error | ||
|
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,15 @@ | ||
error: unused implementer of `Future` that must be used | ||
--> $DIR/assoc-types.rs:19:5 | ||
| | ||
LL | T::foo(); | ||
| ^^^^^^^^ | ||
| | ||
= note: futures do nothing unless you `.await` or poll them | ||
note: the lint level is defined here | ||
--> $DIR/assoc-types.rs:4:9 | ||
| | ||
LL | #![deny(unused_must_use)] | ||
| ^^^^^^^^^^^^^^^ | ||
|
||
error: aborting due to 1 previous error | ||
|
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// edition: 2021 | ||
// revisions: rpitit assoc_ty | ||
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#![deny(unused_must_use)] | ||
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use std::future::Future; | ||
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pub trait Tr { | ||
type Fut: Future<Output = ()>; | ||
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#[cfg(rpitit)] | ||
fn foo() -> impl Future<Output = ()>; | ||
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#[cfg(assoc_ty)] | ||
fn foo() -> Self::Fut; | ||
} | ||
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pub async fn bar<T: Tr>() { | ||
T::foo(); | ||
//~^ ERROR unused implementer of `Future` that must be used | ||
} | ||
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fn main() {} |