Code #![allow(dead_code)] struct Foo<'static>(&'static u32); impl<'static> Foo<'static> { async fn foo() {} } fn main(){} Meta rustc --version --verbose: rustc 1.85.0-nightly (7442931d4 2024-11-30) binary: rustc
asyncfnget_two_sites_async() {// Create two different "futures" which, when run to completion, 创建两个不同的`future`,你可以把`future`理解为未来某个时刻会被执行的计划任务// will asynchronously download the webpages. 当两个`future`被同时执行后,它们将并发的去下载目标页面letfuture_one=downloa...
async fn main() {报错 `main` function is not allowed to be `async` [dependencies] tokio = { version = "0.3", features = ["macros", "sync"] } #[tokio::main] main 又报错The #[tokio::main] macro requires rt or rt-multi-thread. 换成 tokio = { version = "1.24.2", features ...
rust 中的错误类型,位于 std::io::ErrorKind 下: pubenumErrorKind{ /// An entity was not found, often a file. #[stable(feature ="rust1", since ="1.0.0")] NotFound, /// The operation lacked the necessary privileges to complete. #[stable(feature ="rust1", since ="1.0.0")] Permi...
Rust 1.39.0 已经发布。此版本的亮点包括 async/.await,对 match 守卫 by-move 绑定的共享引用,以及函数参数的属性。 async/.await 稳定 此版本 async/.await 特性已经稳定,这意味着现在可以定义 async 函数和块,并进行 .await 操作。 async 函数通过 async fn 引入,被调用时会返回一个 Future,该 Future 是...
调整如下fn append_string(dst: &mut String, data: &str) { dst.push_str(data);} fn test...
error[E0282]: type annotations needed --> test_1/src/lib.rs:16:20 | 16 | some_async_fn(|boo| async move { boo.method() }).await; | ^^^ --- type must be known at this point | help: consider giving this closure parameter an explicit type | 16 | some_async_fn(|boo: /* ...
async fn function_handler(event: LambdaEvent<Value>) -> Result<String, Error> Andere gültige Handler-Signaturen können Folgendes enthalten: Den LambdaEvent Wrapper weglassen — Wenn Sie ihn weglassenLambdaEvent, verlieren Sie den Zugriff auf das Lambda-Kontextobjekt in Ihrer Funktion. Im Folg...
rust编译器针对 self.future.poll(cx) 报了行"no method named poll found for type parameter Fut in the current scope" 的错误。这十分令人困惑,因为我们知道Fut是一个Future,它不是一定会有一个poll方法吗?Rust编译器继续说:Fut没有poll方法,但是Pin有。这个奇怪的类型是什么呢?
struct S { map: HashMap, def: String }impl S {fn ensure_has_entry(&mut self, key: i64) {// Doesn't compile with Rust 2018:self.map.entry(key).or_insert_with(|| self.def.clone());// | --- --- ^^ --- second borrow occurs...// | | | |// | | ...