src/test/ui/by-move-pattern-binding.rs

enum E {
    Foo,
    Bar(String)
}

struct S {
    x: E
}

fn f(x: String) {}

fn main() {
    let s = S { x: E::Bar("hello".to_string()) };
    match &s.x {
        &E::Foo => {}
        &E::Bar(identifier) => f(identifier.clone())  //~ ERROR cannot move
    };
    match &s.x {
        &E::Foo => {}
        &E::Bar(ref identifier) => println!("{}", *identifier)
    };
}