unnecessary binding in if-let statement

What it does

Checks for if-let statements that bind a variable where a single value could be specified instead.

Advantage

Improves readability by replacing a variable with its value and potentially removing a nested if statement.

Drawbacks

Somewhat niche use case, could be prone to false negatives.

Example

let x = Some(("foo", true));

if let Some((message, enabled)) = x {
    if enabled {
        println!("{message}");
    }
}

Could be written as:

let x = Some(("foo", true));

if let Some((message, true)) = x {
    println!("{message}");
}

No files, tests, or entry points are named. Start by locating existing Clippy lints for if-let patterns and their tests, then verify the supplied example and potential false positives; done means the lint recognizes the described binding and replacement case.