试了一下let _个 = 个泛(个);也可以,如果参数是自己let _个泛 = 个泛(个泛);,则报错: error[E0282]: type annotations needed --> src/main.rs:28:18 | 28 | let _个泛 = 个泛(个泛); | ^^^ cannot infer type of the type parameter `T` declared on the struct `个泛` | help: c...
cannot infer type of the type parameter `T` declared on the struct `xx`,泛型struct要使用::<()> .with_context(|| format!("xx")).unwrap()输出的报错信息比match Err(err) => {要多编辑于 2023-12-18 15:27・福建 Rust(编程语言) Rust(游戏) Cargo(Rust) ...
cannot infer type forConn error[E0282]: type annotations needed --> user/src/lib.rs:29:31 | 29 | let count: usize = repos::add_login_info( conn, &new_login_info).expect("add login info error"); | ^^^ cannot infer type for `Conn`12345 1. 2. 3. 4. 5. 刚开始以为是推导不...
error[[E0282]](https://doc.rust-lang.org/nightly/error_codes/E0282.html): type annotations needed --> src/main.rs:11:9 | 11 | Ok(()) | ^^ cannot infer type of the type parameter `E` declared on the enum `Result` | help: consider specifying the generic arguments | 11 | Ok:...
12 | create_and_print(); | ^^^ cannot infer type of the type parameter `T` declared on the function `create_and_print` | = note: multiple `impl`s satisfying `_: From<i32>` found in the `core` crate: - impl From<i32> for AtomicI32; - impl From<i32> for f64; - impl From...
会报错 cannot infer type of the type parameterTdeclared on the methodget, 编译器建议使用 row.get::<usize, T>(0) 如果返回的是String,就改为 row.get::<usize, String>(0) 要把字符串变量传入 子线程,不能用 &str,编译会报错"life time"不够。应该用 String 或 Arc<String> 就没问题了。
rust 无法推断匹配臂上的类型看起来它在尝试推断Deserialize实现的类型时遇到了麻烦。如果我们看一下...
[E0283]:typeannotations needed--> /home/username/.cargo/registry/src/github.com-1ecc6299db9ec823/cargo-0.46.1/src/cargo/util/config/de.rs:471:63|471| seed.deserialize(Tuple2Deserializer(1i32, env.as_ref())) |---^^^--| | | | | cannot infertypefortypeparameter`T`declaredonthe tra...
("A baby dog is called a {}", Animal::baby_name()); | ^^^ cannot infer type | = note: cannot satisfy `_: Animal`error: aborting due to previous errorFor more information about this error, try `rustc --explain E0283`.error: could not compile `traits-example`To learn more...
| 31 | println!("{}",rand::random()); | ^^^ cannot infer type for type parameter `T` declared on the function `random` Run Code Online (Sandbox Code Playgroud) 是否可以直接使用函数返回值println!?Apl*_*123 5 Rust 不知道rand::random应该是什么类型,所以你可以使用turbofish来提供...