NewLint: unused tuple element

[SpriteOvO]

What it does

Detecting if any element in a tuple variable is unused.

Advantage

• If a new element is added, other places that use this tuple may forget to update the use of new elements.

Drawbacks

• It can be a little noisy.
• It cannot be ignored by adding a prefix underscore, but only using #[allow] or #[expect].

Base on that, this lint probably should be in the pedantic category.

Example

fn main() {
    let a = (1, 2);
    println!("{}", a.0);
}

Emit warning

warning: unused tuple element : `a.1`
 --> src/main.rs:2:9
  |
2 |     let a = (1, 2);
  |         ^ 

[GuillaumeGomez]

That sounds like an extension of dead_code in rustc and not something clippy should do.