Rust变量绑定 - Rust教程
Rust通过静态类型提供类型安全。变量绑定可以在声明类型注解的时候。然而,在大多数情况下,编译器将能够推断出变量的类型从上下文,严重降低了注解负担。
值(如文本)可以绑定变量,使用 let 绑定。
fn main() {
let an_integer = 1u32;
let a_boolean = true;
let unit = ();
// copy `an_integer` into `copied_integer`
let copied_integer = an_integer;
println!("An integer: {:?}", copied_integer);
println!("A boolean: {:?}", a_boolean);
println!("Meet the unit value: {:?}", unit);
// The compiler warns about unused variable bindings; these warnings can
// be silenced by prefixing the variable name with an underscore
let _unused_variable = 3u32;
let noisy_unused_variable = 2u32;
// FIXME ^ Prefix with an underscore to suppress the warning
}