What is the syntax for an if-let statement?

Question

I encountered this snippet in some example code. It works fine, but I got a linter error saying that it should be structured as an if-let statement.

match event         


        

Answer 1

Directly quoting from The Book, second edition:

The if let syntax lets you combine if and let into a less verbose way to handle values that match one pattern and ignore the rest.

It also provides this example:

if let Some(3) = some_u8_value {
    println!("three");
}

The correct syntax is if let «pattern» = «expression» { ... }, and not the opposite written in the question.

if let glutin::Event::WindowEvent { event, .. } = event {
    // ...
}