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Diffstat (limited to '')
-rw-r--r-- | src/tools/clippy/tests/ui/unused_async.rs | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/unused_async.rs b/src/tools/clippy/tests/ui/unused_async.rs new file mode 100644 index 000000000..4ca7f29b3 --- /dev/null +++ b/src/tools/clippy/tests/ui/unused_async.rs @@ -0,0 +1,48 @@ +#![warn(clippy::unused_async)] + +use std::future::Future; +use std::pin::Pin; + +async fn foo() -> i32 { + 4 +} + +async fn bar() -> i32 { + foo().await +} + +struct S; + +impl S { + async fn unused(&self) -> i32 { + 1 + } + + async fn used(&self) -> i32 { + self.unused().await + } +} + +trait AsyncTrait { + fn trait_method() -> Pin<Box<dyn Future<Output = i32>>>; +} + +macro_rules! async_trait_impl { + () => { + impl AsyncTrait for S { + fn trait_method() -> Pin<Box<dyn Future<Output = i32>>> { + async fn unused() -> i32 { + 5 + } + + Box::pin(unused()) + } + } + }; +} +async_trait_impl!(); + +fn main() { + foo(); + bar(); +} |