src/tools/clippy/tests/ui/needless_borrowed_ref.rs

   1
   2
   3
   4 #[warn(needless_borrowed_reference)]
   5 #[allow(unused_variables)]
   6 fn main() {
   7     let mut v = Vec::<String>::new();
   8     let _ = v.iter_mut().filter(|&ref a| a.is_empty());
   9     //                            ^ should be linted
  10
  11     let var = 3;
  12     let thingy = Some(&var);
  13     if let Some(&ref v) = thingy {
  14         //          ^ should be linted
  15     }
  16
  17     let mut var2 = 5;
  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.
  22         *v = 10;
  23     }
  24     if let Some(&mut ref v) = thingy2 {
  25         //          ^ should *not* be linted
  26         // here, v is borrowed as immutable.
  27         // can't do that:
  28         //*v = 15;
  29     }
  30 }
  31
  32 #[allow(dead_code)]
  33 enum Animal {
  34     Cat(u64),
  35     Dog(u64),
  36 }
  37
  38 #[allow(unused_variables)]
  39 #[allow(dead_code)]
  40 fn foo(a: &Animal, b: &Animal) {
  41     match (a, b) {
  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
  46     }
  47 }
  48