src/test/ui/uninhabited/uninhabited-irrefutable.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(never_type)]
#![feature(exhaustive_patterns)]

mod foo {
    pub struct SecretlyEmpty {
        _priv: !,
    }

    pub struct NotSoSecretlyEmpty {
        pub _pub: !,
    }
}

struct NotSoSecretlyEmpty {
    _priv: !,
}

enum Foo {
    A(foo::SecretlyEmpty),
    B(foo::NotSoSecretlyEmpty),
    C(NotSoSecretlyEmpty),
    D(u32),
}

fn main() {
    let x: Foo = Foo::D(123);
    let Foo::D(_y) = x; //~ ERROR refutable pattern in local binding: `A(_)` not covered
}