$ cargo run Compiling variables v0.1.0 (file:///projects/variables) error[E0308]: mismatched types --> src/main.rs:3:14 | 2 | let mut spaces = " "; | --- expected due to this value 3 | spaces = spaces.len(); | ^^^ expected `&str`, found `usize` For more information ab...
error[E0308]: mismatched types --> src\main.rs:3:12 | 3 | func = add2; | ^^^ expected fn item, found a different fn item | = note: expected type `fn((i32, i32)) -> i32 {add1}` found type `fn((i32, i32)) -> i32 {add2}` 尽管参数类型一样,返回值类型一样,但这两个...
A statement is a component of a block, which is in turn a component of an outer expression or function 一个stmt 可以是一个前面的 [item](## item), 或是let statement, 或是expression statement, 或是宏调用 macro_rules!test_stmt { ($x: stmt) => { $x } }// let statementtest_stmt!
fnfirst_word(s:&String)->&str{letbytes=s.as_bytes();for(i,&item)inbytes.iter().enumerate(...
Here are a couple examples of this error: ⓘThis example deliberately fails to compile trait Foo { fn foo(x: u16); fn bar(&self); } struct Bar; impl Foo for Bar { // error, expected u16, found i16 fn foo(x: i16) { } // error, types differ in mutability fn bar(&mut sel...
The native syntax makes it more clear that the operand expression of these operators is interpreted as a place expression. It also avoids the term "address-of" when referring to the action of creating a pointer. A pointer is more than just an address, so Rust is moving away from terms li...
本文档是针对嵌入式开发而写。这里不会讨论任何非嵌入式的 Rust 特性:见 https://rust-embedded.github.io/book/intro/no-std.html 。 Cpp 用户请注意。Rust 和 Cpp 共享很多术语与概念(所有权、生命周期、析构器、多态性),但 Rust 对它们的实现往往具有明显不同的语义。在 Cpp 中的经验不应该被期望能准确...
Trait 项(Item) Trait 项是指包含于 trait 声明中的任意项。 Self Self总是指代实现类型。 traitTrait{// always returns i32fnreturns_num()->i32;// returns implementing typefnreturns_self()->Self; }structSomeType;structOtherType;implTraitforSomeType{fnreturns_num()->i32{5}// Self == SomeType...
-D warnings大致等同于-Werror。 其他有趣的标志可以在rustc -C帮助下找到,在夜间,可以在rustc -Z帮助下找到。 Part I: 用 Rust 重写 C 程序 在 深入研究 Rust 的具体特性前,我们将首先探讨 C 语言的概念如何映射到 Rust 中,以及 Un...
本文档是针对嵌入式开发而写。这里不会讨论任何非嵌入式的 Rust 特性:见 https://rust-embedded.github.io/book/intro/no-std.html 。 Cpp 用户请注意。Rust 和 Cpp 共享很多术语与概念(所有权、生命周期、析构器、多态性),但 Rust 对它们的实现往往具有明显不同的语义。在 Cpp 中的经验不应该被期望能准确...