4 #[warn(needless_borrowed_reference)]
5 #[allow(unused_variables)]
7 let mut v = Vec::<String>::new();
8 let _ = v.iter_mut().filter(|&ref a| a.is_empty());
12 let thingy = Some(&var);
13 if let Some(&ref v) = thingy {
18 let thingy2 = Some(&mut var2);
19 if let Some(&mut ref mut v) = thingy2 {
20 // ^ should *not* be linted
21 // v is borrowed as mutable.
24 if let Some(&mut ref v) = thingy2 {
25 // ^ should *not* be linted
26 // here, v is borrowed as immutable.
38 #[allow(unused_variables)]
40 fn foo(a: &Animal, b: &Animal) {
42 (&Animal::Cat(v), &ref k) | (&ref k, &Animal::Cat(v)) => (), // lifetime mismatch error if there is no '&ref'
43 // ^ and ^ should *not* be linted
44 (&Animal::Dog(ref a), &Animal::Dog(_)) => ()
45 // ^ should *not* be linted