Maud and macro_rules don't play well together

[lambda-fairy]

This doesn't work:

macro_rules! greet {
    () => ({
        let mut result = String::new();
        let name = "Pinkie Pie";
        html!(result, p { "Hello, " $name "!" });
        result
    })
}

That's because macro_rules! tries to expand $name itself, when it should be handled by Maud instead.

We can probably work around that by adding a new #splice magic operator. So the code above would look like this:

// ...
html!(result, p { "Hello, " #splice name "!" });
// ...

This works because it doesn't have a $ in it.

See rust-lang/rust#6994