rust/tests/ui/manual_async_fn.rs

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// run-rustfix
// edition:2018
#![warn(clippy::manual_async_fn)]
#![allow(unused)]
use std::future::Future;
fn fut() -> impl Future<Output = i32> {
async { 42 }
}
fn empty_fut() -> impl Future<Output = ()> {
async {}
}
fn core_fut() -> impl core::future::Future<Output = i32> {
async move { 42 }
}
// should be ignored
fn has_other_stmts() -> impl core::future::Future<Output = i32> {
let _ = 42;
async move { 42 }
}
// should be ignored
fn not_fut() -> i32 {
42
}
// should be ignored
async fn already_async() -> impl Future<Output = i32> {
async { 42 }
}
struct S {}
impl S {
fn inh_fut() -> impl Future<Output = i32> {
async {
// NOTE: this code is here just to check that the indentation is correct in the suggested fix
let a = 42;
let b = 21;
if a < b {
let c = 21;
let d = 42;
if c < d {
let _ = 42;
}
}
42
}
}
fn meth_fut(&self) -> impl Future<Output = i32> {
async { 42 }
}
fn empty_fut(&self) -> impl Future<Output = ()> {
async {}
}
// should be ignored
fn not_fut(&self) -> i32 {
42
}
// should be ignored
fn has_other_stmts() -> impl core::future::Future<Output = i32> {
let _ = 42;
async move { 42 }
}
// should be ignored
async fn already_async(&self) -> impl Future<Output = i32> {
async { 42 }
}
}
fn main() {}