see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings> = help: the trait `SliceIndex<[_]>` is implemented for `usize` = help: for that trait implementation, expected `[_]`, found `str` = note: required for `String` to implement ...
如果改为let _字: 个泛<String> = 个泛('a');报错(1): error[E0308]: mismatched types --> src/main.rs:21:29 | 21 | let _字: 个泛<String> = 个泛('a'); | --- ^^^- help: try using a conversion method: `.to_string()` | | | | | expected `String`, found `char` |...
|^expected named lifetime parameter|help:consider introducing a named lifetime parameter|1~pub struct StrSplit<'a>{2~remainder:&'a str,|error[E0106]:missing lifetime specifier-->src/lib.rs:3:16|3|delimiter:&str,|^expected named lifetime parameter|help:consider...
| ^ expected named lifetime parameter|help: consider introducing a named lifetime parameter|1 ~ pub struct StrSplit<'a> {2 | remainder: &str,3 ~ delimiter: &'a str,|error[E0106]: missing lifetime specifier --> src/lib.rs:16:17|16 | type Item = &str;| ^ expected named life...
Compiling playground v0.0.1 (/playground) error: expected `;`, found `println` --> src/main.rs:3:25 | 3 | println!("{}", 我的名字) | ^ help: add `;` here 4 | println!("I'm a Rustacean!") | --- unexpected token 这里就...
Rust 采取了一个不同的策略:内存在拥有它的变量离开作用域后就被自动释放。下面是示例 1 中作用域例子的一个使用 String 而不是字符串字面值的版本: { lets = String::from("hello"); // 从此处起,s 是有效的 // 使用 s } // 此作用域已结束, ...
Rust 采取了一个不同的策略:内存在拥有它的变量离开作用域后就被自动释放。下面是示例 1 中作用域例子的一个使用String而不是字符串字面值的版本: { let s = String::from("hello"); // 从此处起,s 是有效的 // 使用 s } // 此作用域已结束, ...
fnmatch_literal(expected: &'staticstr)->implFn(&str)->Result<(&str, ()), &str> {move|input|matchinput.get(0..expected.len()) {Some(next)ifnext == expected => {Ok((&input[expected.len()..], ())) } _ =>Err(input), ...
{ | ^ expected named lifetime parameter | = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from help: consider using the `'static` lifetime | 5 | fn dangle() -> &'static String { | ~~~ For more information about this e...
error[E0423]: expectedfunction, found macro `println`--> index.rs:3:2|3| println("{}",a); | ^^^ help:use`!`toinvoke the macro: `println!`error: aborting duetopreviouserrorFormore information about thiserror, try `rustc--explain E0423`. 正确写法...