3 #![deny(clippy::useless_asref)]
9 #[allow(clippy::should_implement_trait)]
11 fn as_ref(&self) -> &Self {
18 impl<'a, 'b, 'c> AsRef<&'a &'b &'c MoreRef> for MoreRef {
19 fn as_ref(&self) -> &&'a &'b &'c MoreRef {
24 fn foo_rstr(x: &str) {
27 fn foo_rslice(x: &[i32]) {
30 fn foo_mrslice(x: &mut [i32]) {
33 fn foo_rrrrmr(_: &&&&MoreRef) {
34 println!("so many refs");
38 let rstr: &str = "hello";
39 let mut mrslice: &mut [i32] = &mut [1, 2, 3];
42 let rslice: &[i32] = &*mrslice;
43 foo_rstr(rstr.as_ref());
45 foo_rslice(rslice.as_ref());
49 foo_mrslice(mrslice.as_mut());
51 foo_rslice(mrslice.as_ref());
56 let rrrrrstr = &&&&rstr;
57 let rrrrrslice = &&&&&*mrslice;
58 foo_rslice(rrrrrslice.as_ref());
59 foo_rslice(rrrrrslice);
60 foo_rstr(rrrrrstr.as_ref());
64 let mrrrrrslice = &mut &mut &mut &mut mrslice;
65 foo_mrslice(mrrrrrslice.as_mut());
66 foo_mrslice(mrrrrrslice);
67 foo_rslice(mrrrrrslice.as_ref());
68 foo_rslice(mrrrrrslice);
70 #[allow(unused_parens, clippy::double_parens)]
71 foo_rrrrmr((&&&&MoreRef).as_ref());
73 generic_not_ok(mrslice);
78 let string = "hello".to_owned();
79 let mut arr = [1, 2, 3];
80 let mut vec = vec![1, 2, 3];
83 foo_rstr(string.as_ref());
84 foo_rslice(arr.as_ref());
85 foo_rslice(vec.as_ref());
88 foo_mrslice(arr.as_mut());
89 foo_mrslice(vec.as_mut());
93 let rrrrstring = &&&&string;
94 let rrrrarr = &&&&arr;
95 let rrrrvec = &&&&vec;
96 foo_rstr(rrrrstring.as_ref());
97 foo_rslice(rrrrarr.as_ref());
98 foo_rslice(rrrrvec.as_ref());
101 let mrrrrarr = &mut &mut &mut &mut arr;
102 let mrrrrvec = &mut &mut &mut &mut vec;
103 foo_mrslice(mrrrrarr.as_mut());
104 foo_mrslice(mrrrrvec.as_mut());
107 foo_rrrrmr(MoreRef.as_ref());
109 generic_not_ok(arr.as_mut());
110 generic_ok(&mut arr);
113 fn foo_mrt<T: Debug + ?Sized>(t: &mut T) {
116 fn foo_rt<T: Debug + ?Sized>(t: &T) {
120 fn generic_not_ok<T: AsMut<T> + AsRef<T> + Debug + ?Sized>(mrt: &mut T) {
121 foo_mrt(mrt.as_mut());
123 foo_rt(mrt.as_ref());
127 fn generic_ok<U: AsMut<T> + AsRef<T> + ?Sized, T: Debug + ?Sized>(mru: &mut U) {
128 foo_mrt(mru.as_mut());
129 foo_rt(mru.as_ref());