2021-05-14 19:07:30 -05:00
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#![warn(clippy::unused_async)]
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2023-06-27 15:00:00 -05:00
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#![feature(async_fn_in_trait)]
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#![allow(incomplete_features)]
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2021-05-14 18:45:18 -05:00
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2022-06-20 07:03:27 -05:00
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use std::future::Future;
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use std::pin::Pin;
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2023-05-21 16:07:30 -05:00
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mod issue10800 {
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#![allow(dead_code, unused_must_use, clippy::no_effect)]
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use std::future::ready;
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async fn async_block_await() {
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async {
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ready(()).await;
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};
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}
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async fn normal_block_await() {
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{
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{
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ready(()).await;
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}
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}
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}
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}
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2023-06-27 15:00:00 -05:00
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mod issue10459 {
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trait HasAsyncMethod {
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async fn do_something() -> u32;
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}
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impl HasAsyncMethod for () {
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async fn do_something() -> u32 {
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1
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}
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}
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}
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2023-07-20 17:50:01 -05:00
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mod issue9695 {
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use std::future::Future;
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async fn f() {}
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async fn f2() {}
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async fn f3() {}
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fn needs_async_fn<F: Future<Output = ()>>(_: fn() -> F) {}
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fn test() {
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let x = f;
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needs_async_fn(x); // async needed in f
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needs_async_fn(f2); // async needed in f2
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f3(); // async not needed in f3
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}
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}
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2021-05-14 18:45:18 -05:00
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async fn foo() -> i32 {
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4
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}
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async fn bar() -> i32 {
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foo().await
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}
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2022-06-20 07:03:27 -05:00
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struct S;
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impl S {
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async fn unused(&self) -> i32 {
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1
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}
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async fn used(&self) -> i32 {
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self.unused().await
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}
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}
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trait AsyncTrait {
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fn trait_method() -> Pin<Box<dyn Future<Output = i32>>>;
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}
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macro_rules! async_trait_impl {
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() => {
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impl AsyncTrait for S {
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fn trait_method() -> Pin<Box<dyn Future<Output = i32>>> {
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async fn unused() -> i32 {
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5
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}
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Box::pin(unused())
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}
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}
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};
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}
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async_trait_impl!();
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2021-05-14 18:45:18 -05:00
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fn main() {
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foo();
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bar();
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}
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