#![allow(unused)]
#![warn(clippy::ref_patterns)]

fn use_in_pattern() {
    let opt = Some(5);
    match opt {
        None => {},
        Some(ref opt) => {},
        //~^ ref_patterns
    }
}

fn use_in_binding() {
    let x = 5;
    let ref y = x;
    //~^ ref_patterns
}

fn use_in_parameter(ref x: i32) {}
//~^ ref_patterns

struct Foo {}

// shouldn't trigger the lint
#[automatically_derived]
impl Foo {
    fn foo() {
        if let Some(ref x) = Some(1) {}
    }
}

fn main() {}