// run-rustfix #[warn(clippy::needless_borrowed_reference)] #[allow(unused_variables)] fn main() { let mut v = Vec::<String>::new(); let _ = v.iter_mut().filter(|a| a.is_empty()); // ^ should be linted let var = 3; let thingy = Some(&var); if let Some(&ref v) = thingy { // ^ should be linted } let mut var2 = 5; let thingy2 = Some(&mut var2); if let Some(&mut ref mut v) = thingy2 { // ^ should **not** be linted // v is borrowed as mutable. *v = 10; } if let Some(&mut ref v) = thingy2 { // ^ should **not** be linted // here, v is borrowed as immutable. // can't do that: //*v = 15; } } #[allow(dead_code)] enum Animal { Cat(u64), Dog(u64), } #[allow(unused_variables)] #[allow(dead_code)] fn foo(a: &Animal, b: &Animal) { match (a, b) { (&Animal::Cat(v), &ref k) | (&ref k, &Animal::Cat(v)) => (), // lifetime mismatch error if there is no '&ref' // ^ and ^ should **not** be linted (&Animal::Dog(ref a), &Animal::Dog(_)) => (), // ^ should **not** be linted } }