Cairo lint

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manual_is_err ​

Default: Enabled

Source Code

What it does ​

Checks for manual implementations of is_err.

Example ​

cairo
fn main() {
    let res_val: Result<i32> = Result::Err('err');
    let _a = match res_val {
        Result::Ok(_) => false,
        Result::Err(_) => true
    };
}

Can be rewritten as:

cairo
fn main() {
    let res_val: Result<i32> = Result::Err('err');
    let _a = res_val.is_err();
}