| -- move occurs because `s1` hastype`String`,whichdoes not implement the `Copy` trait 4 |lets2 = s1; | -- value moved here 5 | 6 | println!("{}, world!", s1); | ^^ value borrowed here after move | = note: this error originatesinthe macro `$crate::format_args_nl` (in...
| -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait 4 | let s2 = s1; | -- value moved here 5 | 6 | println!("{}, world!", s1); | ^^ value borrowed here after move | = note: this error originates in the macro `$crate::format_a...
Compiling ownership v0.1.0(file:///projects/ownership)error[E0382]:borrowofmoved value:`s1`-->src/main.rs:5:28|2|lets1=String::from("hello");|--move occurs because`s1`has type`String`,which does not implement the`Copy`trait3|lets2=s1;|--value moved here4|5|println!("{}, world!
lets1 =String::from("hello"); lets2 = s1; println!("{}, world!", s1); } 但是,它就是编译不过。当你编译的时候会提示你: let s1 = String::from("hello"); | -- move occurs because `s1` has type `String`, which does not implement the `Copy` trait 3 | let s2 = s1; | --...
["udon".to_string(),"ramen".to_string(),"soba".to_string()];|- move occurs because`s`hastype`Vec<String>`, which does not implement the`Copy`trait3|lett=s;|- value moved here4|letu=s;|^ value used here after move|help: consider cloning the valueifthe performance cost is ...
move occurs because a has type (i32, f64, String), which does not implement the Copy trait 转移发生是因为a的类型(i32, f64, String)没有实现复制特征(Copy trait) 这里出现了一个新概念trait,我们暂且不表。顾名思义即可。我们来把这句话说的人性话点。就是说类型没有复制的特征(或者功能,或者方法...
error[E0382]:borrowofmoved value:`s`-->src/main.rs:8:20|6|lets=String::from("Hello World!");|-move occurs because`s`has type`String`,which does not implement the`Copy`trait7|echo(s);|-value moved here8|println!("{}",s);|^value borrowed here after move ...
结构可以是Copy,而i32是Copy,因此Point有资格成为Copy。相比之下,考虑 structPointList{points: Vec<Point>, } 结构PointList无法实现Copy,因为Vec<T>不是Copy。如果我们尝试派生Copy实现,我们会得到一个错误: the trait `Copy` maynotbe implementedforthistype; field `points` doesnotimplement `Copy` ...
| --- move occurs becausephas typePoint, which does not implement theCopytrait 12 | p.x += 1; 13 | f2(p); | - value moved here 14 | println!("{},{}", p.x, p.y); | ^^^ value borrowed here after move | = note: this error originates in the macro$crate::format_args_...
let s = String::from("hello"); 1. 这两个冒号 :: 是运算符,允许将特定的 from 函数置于 String 类型的命名空间(namespace)下,而不需要使用类似 string_from 这样的名字。 可以修改此类字符串 : ...