El compilador de Rust produce fantásticos mensajes de error, así como útiles lints integradas. Clippy proporciona aún más ayuda, organizadas en grupos que se pueden habilitar por proyecto.
#[deny(clippy::cast_possible_truncation)]
fn main() {
let x = 3;
while (x < 70000) {
x *= 2;
}
println!("X probably fits in a u16, right? {}", x as u16);
}
Si lo ejecutamos :
Compiling hello_cargo v0.1.0
warning: unnecessary parentheses around `while` condition
--> src/main.rs:7:11
|
7 | while (x < 70000) {
| ^ ^
|
= note: `#[warn(unused_parens)]` on by default
help: remove these parentheses
|
7 - while (x < 70000) {
7 + while x < 70000 {
|
error[E0384]: cannot assign twice to immutable variable `x`
--> src/main.rs:9:9
|
5 | let x = 3;
| -
| |
| first assignment to `x`
| help: consider making this binding mutable: `mut x`
...
9 | x *= 2;
| ^^^^^^ cannot assign twice to immutable variable
For more information about this error, try `rustc --explain E0384`.
warning: `hello_cargo` (bin "hello_cargo") generated 1 warning
error: could not compile `hello_cargo` (bin "hello_cargo") due to previous error; 1 warning emitted
* Error
Clippy tiene una extensa documentación de sus lints: https://doc.rust-lang.org/nightly/clippy/
