以前,编译器会给出如下内置错误: error[E0277]:thetraitbound`String:ImportantTrait<i32>`isnotsatisfied -->src/main.rs:12:18 | 12|use_my_trait(String::new); |---^^^thetrait`ImportantTrait<i32>`isnotimplementedfor`String` || |requiredbyaboundintroducedbythiscall Assertingunsafepreconditions - ...
fn bar(self) { unimplemented!(); } } ...give me this error: Compiling testproject v0.0.1 (file:///home/virtlink/projects/orion/testproject) src/lib.rs:6:1: 8:2 error: the trait `B` is not implemented for the type `BImpl` [E0277] src/lib.rs:6 impl<BImpl> A<BImpl> for...
` operator in a function that returns `()`|= help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()` 因为? 要求 Result<T, E> 形式的返回值,而 main 函数的返回是 (),因此无法满足,那是不是就无解了呢? 实际上 Rust 还支持另外一种形式的 main 函...
().unwrap(); //println!("{:#?}", u); // error[E0277]: the trait bound `User: std::str::FromStr` is not satisfied // --> src/main.rs:24:21 // | // 24 | let u: User = j.parse().unwrap(); // | ^^^ the trait `std::str::FromStr` is not implemented for `Use...
; | ^ the trait `From<VarError>` is not implemented for `MyError` | = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait = note: required because of the requirements on the impl of `FromResidual<Result<Infallible, Var...
error[E0277]: the trait bound `HackEndpointSet: EndpointStateSealed` is not satisfied --> src/main.rs:71:28 | 71 | impl EndpointState for HackEndpointSet {} | ^^^ the trait `EndpointStateSealed` is not implemented for `HackEndpointSet` | = help: the following other types implement...
counter:std::rc::Rc<std::sync::Mutex<i32>>]`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<std::sync::Mutex<i32>>` = note: required because it appears within the type `[closure@src/main.rs:11:36: 15:10 ...
if you wanted to perform a search and replace in aVec<u8>, then writing the code to do that with thetwowaycrate is not that difficult, but it's still additional glue code you have to write. This work adds up depending on what you're doing. Consider, for example, trimming and splitti...
rust 为什么trait类型`Box< dyn Error>`的错误是“Sized is not implemented”，但`async fn()-> ...
error[E0106]: missing lifetime specifier--> dangle.rs:5:16|5| fn dangle() -> &String {| ^ expected lifetime parameter|= help:thisfunction'sreturntype contains a borrowed value, but there isno valueforit to be borrowed from= help: consider giving it a 'staticlifetime ...