rustHow do I identify unused variables in Rust?

Unused variables in Rust can be identified by the compiler. The compiler will throw a warning when it detects an unused variable.

Example code

fn main() {
    let x = 5;
    println!("x is {}", x);
}

Output example

warning: unused variable: `x`
  --> src/main.rs:2:9
   |
2  |     let x = 5;
   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
   = note: #[warn(unused_variables)] on by default

The compiler will throw a warning when it detects an unused variable. In the example code, the variable x is unused and the compiler throws a warning. To prevent the warning, the variable can be prefixed with an underscore, like _x.

Helpful links

• Rust Documentation - Unused Variables

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