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,
14 clippy::let_unit_value
19 fn callable_str(&self) -> Self::T;
21 impl CallableStr for () {
23 fn callable_str(&self) -> Self::T {
28 impl CallableStr for i32 {
29 type T = <() as CallableStr>::T;
30 fn callable_str(&self) -> Self::T {
35 trait CallableT<U: ?Sized> {
37 fn callable_t(&self) -> Self::T;
39 impl<U: ?Sized> CallableT<U> for () {
41 fn callable_t(&self) -> Self::T {
42 fn f<U: ?Sized>(_: &U) {}
46 impl<U: ?Sized> CallableT<U> for i32 {
47 type T = <() as CallableT<U>>::T;
48 fn callable_t(&self) -> Self::T {
54 fn f_string(_: &String) {}
56 fn f_ref_t<T: ?Sized>(_: &T) {}
58 fn f_str_t<T>(_: &str, _: T) {}
60 fn f_box_t<T>(_: &Box<T>) {}
67 let s = String::new();
70 let _ = &*s; // Don't lint. Inferred type would change.
71 let _: &_ = &*s; // Don't lint. Inferred type would change.
74 f_t(&*s); // Don't lint. Inferred type would change.
75 f_ref_t(&*s); // Don't lint. Inferred type would change.
77 f_str_t(&s, &*s); // Don't lint second param.
79 let b = Box::new(Box::new(Box::new(5)));
80 let _: &Box<i32> = &b;
81 let _: &Box<_> = &**b; // Don't lint. Inferred type would change.
83 f_box_t(&**b); // Don't lint. Inferred type would change.
85 let c = |_x: &str| ();
89 c(&*s); // Don't lint. Inferred type would change.
91 fn _f(x: &String) -> &str {
95 fn _f1(x: &String) -> &str {
99 fn _f2(x: &String) -> &str {
103 fn _f3(x: &Box<Box<Box<i32>>>) -> &Box<i32> {
112 f4: impl CallableStr,
113 f5: <() as CallableStr>::T,
114 f6: <i32 as CallableStr>::T,
115 f7: &dyn CallableStr<T = fn(&str)>,
116 f8: impl CallableT<str>,
117 f9: <() as CallableT<str>>::T,
118 f10: <i32 as CallableT<str>>::T,
119 f11: &dyn CallableT<str, T = fn(&str)>,
124 f4.callable_str()(&x);
127 f7.callable_str()(&x);
131 f11.callable_t()(&x);
134 struct S1<'a>(&'a str);
140 let _ = S2 { s: &s };
142 struct S3<'a, T: ?Sized>(&'a T);
143 let _ = S3(&*s); // Don't lint. Inferred type would change.
145 struct S4<'a, T: ?Sized> {
148 let _ = S4 { s: &*s }; // Don't lint. Inferred type would change.
155 fn m1(s: &'a String) {
157 let _ = Self::S2 { s: s };
161 let _ = E1::S2 { s: &s };
163 enum E2<'a, T: ?Sized> {
167 let _ = E2::S1(&*s); // Don't lint. Inferred type would change.
168 let _ = E2::S2 { s: &*s }; // Don't lint. Inferred type would change.
171 let _: &String = &*ref_s; // Don't lint reborrow.
172 f_string(&*ref_s); // Don't lint reborrow.
177 let b = Box::new(Box::new(S5 { foo: 5 }));
185 impl core::ops::Deref for S6 {
187 fn deref(&self) -> &Self::Target {
191 let s6 = S6 { foo: S5 { foo: 5 } };
192 let _ = (*s6).foo; // Don't lint. `S6` also has a field named `foo`
194 let ref_str = &"foo";
195 let _ = f_str(ref_str);
196 let ref_ref_str = &ref_str;
197 let _ = f_str(ref_ref_str);
199 fn _f5(x: &u32) -> u32 {
207 f_str(&&ref_str); // `needless_borrow` will suggest removing both references
208 f_str(&ref_str); // `needless_borrow` will suggest removing only one reference