mirror of https://github.com/rust-lang/rust
63 lines
1.2 KiB
Rust
63 lines
1.2 KiB
Rust
//@ edition:2018
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#![deny(unused_must_use)]
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#[must_use]
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async fn foo() -> i32 {
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1
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}
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#[must_use]
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fn bar() -> impl std::future::Future<Output=i32> {
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async {
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42
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}
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}
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async fn baz() -> i32 {
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0
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}
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struct Wowee {}
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impl Wowee {
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#[must_use]
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async fn test_method() -> i32 {
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1
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}
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}
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async fn test() {
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foo(); //~ ERROR unused return value of `foo` that must be used
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//~^ ERROR unused implementer of `Future` that must be used
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foo().await; //~ ERROR unused output of future returned by `foo` that must be used
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bar(); //~ ERROR unused return value of `bar` that must be used
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//~^ ERROR unused implementer of `Future` that must be used
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bar().await; // ok, it's not an async fn
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baz(); //~ ERROR unused implementer of `Future` that must be used
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baz().await; // ok
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}
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/* FIXME(guswynn) update this test when async-fn-in-traits works
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trait Doer {
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#[must_use]
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async fn test_trait_method() -> i32;
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WARNING must_use
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async fn test_other_trait() -> i32;
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}
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impl Doer for Wowee {
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async fn test_trait_method() -> i32 {
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1
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}
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#[must_use]
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async fn test_other_trait() -> i32 {
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WARNING must_use
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1
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}
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}
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*/
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fn main() {
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}
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