Macro template 

macro_rules! template {
    ($name:ident ($($field:ident : &$typ:ty),*) { $($tmpl:tt)* } $($rest:tt)*) => { ... };
    (pub $name:ident ($($field:ident : &$typ:ty),*) { $($tmpl:tt)* } $($rest:tt)*) => { ... };
    () => { ... };
}

Create a new template.

This allows you to declare a template as follows:

template! {
    MyTemplate(name: &str, age: &u32) {
        p {
           : "Hello, my name is ";
           : name;
           : " and I am ";
           : age;
           : " years old.";
        }
    }
}

You can instantiate these templates by calling new on them:

let age = 42;
let tmpl = MyTemplate::new("Not Me", &age);

These templates never own their content, they just borrow it. This is one of the reasons I call this feature “experimental”.