Confy: read configuration files at compile-time

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Confy is a compiler plugin for reading TOML configuration files at compile-time. You can use it like this:

#![feature(plugin)]
#![plugin(confy(file="Config.toml"))]

fn main() {
    // This will read the "string" and "bool" entries in Config.toml
    assert_eq!(config!("string"), "value");
    assert_eq!(config!("bool"), false);

    // You can also specify a default value
    assert_eq!(config!("key not found", "foo"), "foo");
}

As this is my first compiler plugin, I would appreciate any suggestion to improve the code! Also, if think of a way it could be enhanced, let me know.

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