Let bindings in rsx! macro, like with yew_html_ext.

[Ddystopia]

Hello, I've been using yew for a long time and with yew_html_ext you can have let bindings inside html! macro. This is extremely handy and I was using it all the time - especially good for loops or refactoring in general.

It would be really nice to have this feature in rsx! as well!

It could be simulated like this currently:

rsx! {
    for i in 0..10 {
        if let foo = bar(i) {
            span { "{foo}" }
        }
    }
}

But it creates a new level of indentation. This would be better:

rsx! {
    for i in 0..10 {
        let foo = bar(i);
        span { "{foo}" }
    }
}

[Infinoid]

The if let syntax also generates a warning, which needs #[allow(irrefutable_let_patterns)] to silence. I agree, your proposed syntax looks handy.