65 lines
1.4 KiB
Rust
65 lines
1.4 KiB
Rust
// run-rustfix
|
|
|
|
#![allow(unused)]
|
|
#![warn(clippy::redundant_async_block)]
|
|
|
|
async fn func1(n: usize) -> usize {
|
|
n + 1
|
|
}
|
|
|
|
async fn func2() -> String {
|
|
let s = String::from("some string");
|
|
let f = async { (*s).to_owned() };
|
|
let x = f;
|
|
x.await
|
|
}
|
|
|
|
macro_rules! await_in_macro {
|
|
($e:expr) => {
|
|
std::convert::identity($e).await
|
|
};
|
|
}
|
|
|
|
async fn func3(n: usize) -> usize {
|
|
// Do not lint (suggestion would be `std::convert::identity(func1(n))`
|
|
// which copies code from inside the macro)
|
|
async move { await_in_macro!(func1(n)) }.await
|
|
}
|
|
|
|
// This macro should never be linted as `$e` might contain `.await`
|
|
macro_rules! async_await_parameter_in_macro {
|
|
($e:expr) => {
|
|
async { $e.await }
|
|
};
|
|
}
|
|
|
|
// MISSED OPPORTUNITY: this macro could be linted as the `async` block does not
|
|
// contain code coming from the parameters
|
|
macro_rules! async_await_in_macro {
|
|
($f:expr) => {
|
|
($f)(async { func2().await })
|
|
};
|
|
}
|
|
|
|
fn main() {
|
|
let fut1 = async { 17 };
|
|
let fut2 = fut1;
|
|
|
|
let fut1 = async { 25 };
|
|
let fut2 = fut1;
|
|
|
|
let fut = async { 42 };
|
|
|
|
// Do not lint: not a single expression
|
|
let fut = async {
|
|
func1(10).await;
|
|
func2().await
|
|
};
|
|
|
|
// Do not lint: expression contains `.await`
|
|
let fut = async { func1(func2().await.len()).await };
|
|
|
|
let fut = async_await_parameter_in_macro!(func2());
|
|
let fut = async_await_in_macro!(std::convert::identity);
|
|
}
|