//@ run-pass
#![allow(incomplete_features)]
#![feature(ref_pat_everywhere)]

pub fn main() {
    if let Some(Some(&x)) = &Some(&Some(0)) {
        let _: u32 = x;
    }
    if let Some(&Some(x)) = &Some(Some(0)) {
        let _: u32 = x;
    }
    if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
        let _: u32 = x;
    }
    if let Some(Some(&x)) = &Some(&mut Some(0)) {
        let _: u32 = x;
    }
    if let &Some(x) = &mut Some(0) {
        let _: u32 = x;
    }
    if let Some(&x) = &mut Some(0) {
        let _: u32 = x;
    }
}