Violating Rust's memory safety

fn main() {
    let foo = String::new("FOO");

    let foo = match 0 {
        0 if { some_func(foo) } => unreachable!(),
        _  => { foo }
    };

    println!("{:#?}", foo);

fn some_func(bar: String) -> bool {
    drop(bar);
    false
}

This program prints a garbage on the screen with a "Segmentation fault"