note: required by a boundin`next_element` -->/home/alxps/.cargo/registry/src/index.crates.io-6f17d22bba15001f/serde-1.0.195/src/de/mod.rs:1726:12|1724|fnnext_element<T>(&mutself)->Result<Option<T>,Self::Error> | --- required by a boundinthis associated function1725|where1726| ...
= help: the trait `PartialOrd` is not implemented for `T1` note: required by a bound in `max` --> src/main.rs:31:10 | 31 | fn max<T:PartialOrd>(a: T, b: T) -> T { | ^^^ required by this bound in `max` help: consider annotating `T1` with `#[derive(PartialOrd)]` |...
note: required by a bound in `spawn` thread::spawn函数要求它的参数是Send的,而一个闭包仅当它捕获的所有东西都是Send时它才是Send的。如果我们尝试捕获不是Send的东西,那么我们的错误会被抓到,从而保护我们,防止未定义行为。 Locking: Mutexes and RwLocks 线程间共享(可变)数据最常用的工具是mutex,它是...
= note: required because it appears within the type `[closure@src/main.rs:11:36: 15:10]` note: required by a bound in `spawn` For more information about this error, try `rustc --explain E0277`. error: could not compile `shared-state` due to previous error 1. 2. 3. 4. 5. 6...
requirements on the impl of `AsRef<str>` for `&[u8; 11]` note: required by a bound in ...
HackEndpointSet {} | ^^^ the trait `EndpointStateSealed` is not implemented for `HackEndpointSet` | = help: the following other types implement trait `EndpointStateSealed`: oauth::EndointSet EndpointNotSet note: required by a bound in `oauth::EndpointState` --> src/main.rs:12:30 | 12...
$ cargo run Compiling traits-example v0.1.0(file:///projects/traits-example)error[E0277]: `Point` doesn't implement `std::fmt::Display` --> src/main.rs:20:6 |3 | trait OutlinePrint: fmt::Display { | --- required by this bound in `OutlinePrint`...20 | impl OutlinePrint for...
Rust 要求所有变量都有类型,因为类型是对变量值空间的约束。这里给参数 a、b 指定为 i32 类型,就相当于给 a、b 的取值范围添加了约束,它们的值空间被限定在了 i32 范围内。对于简单的应用,这种限定是没有问题的,但对于抽象程度比较高的应用,这种限定就显得太过死板。
a closure which takes no// inputs and returns nothing - exactly what is required// for `print`.fn apply<F>(f: F) where F: Fn() { f();}fn main() { let x = 7; // Capture `x` into an anonymous type and implement // `Fn` for it. Store it in `print`....
cargo-mutants [cargo-mutants] - Finds inadequately tested code by injecting mutations, no source changes required. mutagen [mutagen] - A source-level mutation testing framework (nightly only) Property Testing and Fuzzing proptest - property testing framework inspired by the Hypothesis framework for...