I tried this code: #[derive(Default)] pub struct TestStruct<const N: usize = 0>; pub fn main() { let _ = TestStruct::default(); } I expected this to compile properly, since without specifying the const parameter of the TestStruct<N> type...
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・IP 属地福建 内容所属专栏 软件工具踩坑记录 软件工具踩坑记录 订阅专栏 Rust(编...
Rust 可推导出 BTreeMap 的类型 K 和V 都是字符串引用 &str;如果把 map.insert 语句注释去掉,Rust 编译器就会报错:“cannot infer type for type parameter K”。 无法推导出类型的例子 // 把列表中的偶数过滤出来,生成一个新的列表 fn main() { let numbers = vec![1, 2, 3, 4, 5, 6, 7, 8...
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:...
这是报错内容 error[E0282]: type annotations needed --> src/main.rs:34:15 | 34 | match map[x][y] { | ^^^ cannot infer type | = note: type must be known at this point 以下是源码,删除了无关紧要的内容use rand::prelude::*; #[derive(Debug, Clone, Copy)] enum Point { ...
| ^^^ cannot infer type for `Conn`12345 1. 2. 3. 4. 5. 刚开始以为是推导不出参数conn的类型,甚是奇怪,仔细看发现是Conn一个全小写一个首字母大写,代码里也没用到Conn啊,是不是调diesel API里的,在翻看diesel文档时确实见过Conn fn execute(self, conn: &Conn...
3.1 error[E0282]: type annotations needed --> /home/hago/.cargo/registry/src/index.crates.io-6f17d22bba15001f/scale-info-2.11.2/src/form.rs:64:39 | 64 | #[cfg_attr(feature = "schema", derive(JsonSchema))] | ^^^ cannot infer type | = note: this error originates in the derive...
| cannot infer type for `_` | consider giving `guess` a type 在我们讨论各种数据类型时,你会看到不同的类型注解。 标量(scalar)类型代表一个单独的值。Rust 有四种基本的标量类型:整型、浮点型、布尔类型和字符类型。你可能在其他语言中见过它们,不过让我们深入了解它们在 Rust 中是如何工作的。
error[E0282]: type annotations neededfor`(Sender<T>, std::sync::mpsc::Receiver<T>)`--> src/main.rs:60:19 | 60 | let (tx,rx) =mpsc::channel();| --- ^^^ cannot infer typefortype parameter `T` declared on the function `channel`| | | consider givingthispattern...
| ^^^ cannot infertype| =note: cannot satisfy `_: Animal`error: aborting duetopreviouserrorFormore information about thiserror, try `rustc--explain E0283`.error: couldnotcompile `traits-example`Tolearn more, run the command againwith--verbose. 复制代码 为了消歧义,明确...