3 #![warn(clippy::explicit_auto_deref)]
8 clippy::needless_borrow,
9 clippy::needless_return,
11 clippy::redundant_field_names,
12 clippy::too_many_arguments,
13 clippy::borrow_deref_ref
18 fn callable_str(&self) -> Self::T;
20 impl CallableStr for () {
22 fn callable_str(&self) -> Self::T {
27 impl CallableStr for i32 {
28 type T = <() as CallableStr>::T;
29 fn callable_str(&self) -> Self::T {
34 trait CallableT<U: ?Sized> {
36 fn callable_t(&self) -> Self::T;
38 impl<U: ?Sized> CallableT<U> for () {
40 fn callable_t(&self) -> Self::T {
41 fn f<U: ?Sized>(_: &U) {}
45 impl<U: ?Sized> CallableT<U> for i32 {
46 type T = <() as CallableT<U>>::T;
47 fn callable_t(&self) -> Self::T {
53 fn f_string(_: &String) {}
55 fn f_ref_t<T: ?Sized>(_: &T) {}
57 fn f_str_t<T>(_: &str, _: T) {}
59 fn f_box_t<T>(_: &Box<T>) {}
62 let s = String::new();
65 let _ = &*s; // Don't lint. Inferred type would change.
66 let _: &_ = &*s; // Don't lint. Inferred type would change.
69 f_t(&*s); // Don't lint. Inferred type would change.
70 f_ref_t(&*s); // Don't lint. Inferred type would change.
72 f_str_t(&*s, &*s); // Don't lint second param.
74 let b = Box::new(Box::new(Box::new(5)));
75 let _: &Box<i32> = &**b;
76 let _: &Box<_> = &**b; // Don't lint. Inferred type would change.
78 f_box_t(&**b); // Don't lint. Inferred type would change.
80 let c = |_x: &str| ();
84 c(&*s); // Don't lint. Inferred type would change.
86 fn _f(x: &String) -> &str {
90 fn _f1(x: &String) -> &str {
94 fn _f2(x: &String) -> &str {
98 fn _f3(x: &Box<Box<Box<i32>>>) -> &Box<i32> {
107 f4: impl CallableStr,
108 f5: <() as CallableStr>::T,
109 f6: <i32 as CallableStr>::T,
110 f7: &dyn CallableStr<T = fn(&str)>,
111 f8: impl CallableT<str>,
112 f9: <() as CallableT<str>>::T,
113 f10: <i32 as CallableT<str>>::T,
114 f11: &dyn CallableT<str, T = fn(&str)>,
119 f4.callable_str()(&*x);
122 f7.callable_str()(&*x);
123 f8.callable_t()(&*x);
126 f11.callable_t()(&*x);
129 struct S1<'a>(&'a str);
135 let _ = S2 { s: &*s };
137 struct S3<'a, T: ?Sized>(&'a T);
138 let _ = S3(&*s); // Don't lint. Inferred type would change.
140 struct S4<'a, T: ?Sized> {
143 let _ = S4 { s: &*s }; // Don't lint. Inferred type would change.
150 fn m1(s: &'a String) {
151 let _ = Self::S1(&**s);
152 let _ = Self::S2 { s: &**s };
156 let _ = E1::S2 { s: &*s };
158 enum E2<'a, T: ?Sized> {
162 let _ = E2::S1(&*s); // Don't lint. Inferred type would change.
163 let _ = E2::S2 { s: &*s }; // Don't lint. Inferred type would change.
166 let _: &String = &*ref_s; // Don't lint reborrow.
167 f_string(&*ref_s); // Don't lint reborrow.
172 let b = Box::new(Box::new(S5 { foo: 5 }));
180 impl core::ops::Deref for S6 {
182 fn deref(&self) -> &Self::Target {
186 let s6 = S6 { foo: S5 { foo: 5 } };
187 let _ = (*s6).foo; // Don't lint. `S6` also has a field named `foo`
189 let ref_str = &"foo";
190 let _ = f_str(*ref_str);
191 let ref_ref_str = &ref_str;
192 let _ = f_str(**ref_ref_str);
194 fn _f5(x: &u32) -> u32 {