使用Project Fluent的Rust实现匹配None和absent值

use fluent_bundle::{FluentBundle, FluentResource};
use fluent_fallback::Localization;

let mut bundle = FluentBundle::new(&["en-US"]);
let resource = FluentResource::try_new("path/to/resource.ftl")
    .expect("Failed to load Fluent resource file");
bundle.add_resource(resource)
    .expect("Failed to add Fluent resource");

let localization = Localization::new(&["en-US"]);
localization.add_bundle(bundle);

let message = localization
    .get_message("my-message")
    .expect("Failed to get message");
let value = message.value.expect("Message has no value");

// 匹配None值
if value == "None" {
    // 处理None值的逻辑
}

// 匹配absent值
if value == "absent" {
    // 处理absent值的逻辑
}