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#![feature(box_patterns)]

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

enum Foo { A(Box<Foo>, isize), B(usize), }

fn main() {
    match Foo::B(1) {
        Foo::B(_) | Foo::A(box _, 1) => { }
        Foo::A(_, 1) => { } //~ ERROR unreachable pattern
        _ => { }
    }
}