3 #[allow(clippy::trivially_copy_pass_by_ref)]
8 #[warn(clippy::all, clippy::needless_borrow)]
9 #[allow(unused_variables)]
14 let s = &String::from("hi");
15 let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
16 let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
18 let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
19 h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
20 if let Some(ref cake) = Some(&5) {}
21 let garbl = match 42 {
25 &&a // FIXME: this should lint, too
32 fn f<T: Copy>(y: &T) -> T {
36 fn g(y: &[u8]) -> u8 {
42 impl<'a> Trait for &'a str {}
44 fn h(_: &dyn Trait) {}
45 #[warn(clippy::needless_borrow)]
48 let mut v = Vec::<String>::new();
49 let _ = v.iter_mut().filter(|&ref a| a.is_empty());
50 let _ = v.iter().filter(|&ref a| a.is_empty());
52 let _ = v.iter().filter(|&a| a.is_empty());
56 #[warn(clippy::needless_borrow)]