src/test/ui/lint/lint-dead-code-5.rs

#![allow(unused_variables)]
#![deny(dead_code)]

enum Enum1 {
    Variant1(isize),
    Variant2 //~ ERROR: variant is never constructed
}

enum Enum2 {
    Variant3(bool),
    #[allow(dead_code)]
    Variant4(isize),
    Variant5 { _x: isize }, //~ ERROR: variant is never constructed: `Variant5`
    Variant6(isize), //~ ERROR: variant is never constructed: `Variant6`
    _Variant7,
}

enum Enum3 { //~ ERROR: enum is never used
    Variant8,
    Variant9
}

fn main() {
    let v = Enum1::Variant1(1);
    match v {
        Enum1::Variant1(_) => (),
        Enum1::Variant2 => ()
    }
    let x = Enum2::Variant3(true);
}