Attempted usage of Rocket + Askama that leads to build failure.

build.rs

extern crate askama;

fn main ()
{
    askama::rerun_if_templates_changed();
}

Cargo.toml

[package]
name = "www-nordstroem-no"
version = "0.2.0"
authors = ["Erik Nordstrøm <erik@nordstroem.no>"]
publish = false

[dependencies]
rocket = "0.3.7"
rocket_codegen = "0.3.7"
askama = { version = "0.5", features = ["with-rocket"] }

[build-dependencies]
askama = { version = "0.5", features = ["with-rocket"] }

main.rs

#![feature(plugin)]
#![plugin(rocket_codegen)]

extern crate rocket;

#[macro_use]
extern crate askama;

use askama::Template;

#[derive(Template)]
#[template(path = "layout.htm")]
struct Layout<'a>
{
    page_id: &'a str,
    title: &'a str,
}

#[get("/")]
fn index () -> &'static str
{
    "Hello, world!"
}

#[derive(Template)]
#[template(path = "auth.htm")]
struct AuthTemplate<'a>
{
    _parent: Layout<'a>,
    challenge: &'a str,
}

#[get("/auth.htm")]
fn auth () -> AuthTemplate<'static>
{
    AuthTemplate
    {
        _parent: Layout
        {
            page_id: "auth",
            title: "Authentication Required",
        },
        challenge: "foobar",
    }
}

fn main ()
{
    rocket::ignite().mount("/", routes![index]).launch();
}