Rust - instanceOf

instanceOf.rs

enum FooBar {
    Foo(u8),
    Bar(u8)
}

fn test(v: bool) -> FooBar {
    if v {
        FooBar::Foo(5)
    } else {
        FooBar::Bar(10)
    }
}

fn main() {
    let f: FooBar = test(true);

    // Now that we have a `Box<Base>` (`*f` makes it a `Base`),
    // let's handle different cases:
    match f {
        FooBar::Foo(x) => println!("it was Foo: {}!", x),
        FooBar::Bar(y) => println!("it was Bar: {}!", y),
    }
}

https://play.rust-lang.org/?version=stable&mode=debug&edition=2015&gist=19c3e3dec1ba2a142ef6fd8c4571be8a