[
    BlogPost {
        id: 0,
        title: "Hello, World!",
        body: "This is a blog post.",
        category: Custom("Welcome"),
    },
    BlogPost {
        id: 1,
        title: "I love Rust",
        body: "Long live Ferris 🦀",
        category: Rust,
        previous_in_series: Some(0)
    },
]