rust-clippy/tests/ui/methods.stderr

error: unnecessary structure name repetition
  --> $DIR/methods.rs:21:29
   |
21 |     pub fn add(self, other: T) -> T { self }
   |                             ^ help: use the applicable keyword: `Self`
   |
   = note: `-D use-self` implied by `-D warnings`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:21:35
   |
21 |     pub fn add(self, other: T) -> T { self }
   |                                   ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:25:25
   |
25 |     fn eq(&self, other: T) -> bool { true } // no error, private function
   |                         ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:27:26
   |
27 |     fn sub(&self, other: T) -> &T { self } // no error, self is a ref
   |                          ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:27:33
   |
27 |     fn sub(&self, other: T) -> &T { self } // no error, self is a ref
   |                                 ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:28:21
   |
28 |     fn div(self) -> T { self } // no error, different #arguments
   |                     ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:29:25
   |
29 |     fn rem(self, other: T) { } // no error, wrong return type
   |                         ^ help: use the applicable keyword: `Self`

error: defining a method called `add` on this type; consider implementing the `std::ops::Add` trait or choosing a less ambiguous name
  --> $DIR/methods.rs:21:5
   |
21 |     pub fn add(self, other: T) -> T { self }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D should-implement-trait` implied by `-D warnings`

error: methods called `into_*` usually take self by value; consider choosing a less ambiguous name
  --> $DIR/methods.rs:32:17
   |
32 |     fn into_u16(&self) -> u16 { 0 }
   |                 ^^^^^
   |
   = note: `-D wrong-self-convention` implied by `-D warnings`

error: methods called `to_*` usually take self by reference; consider choosing a less ambiguous name
  --> $DIR/methods.rs:34:21
   |
34 |     fn to_something(self) -> u32 { 0 }
   |                     ^^^^

error: methods called `new` usually take no self; consider choosing a less ambiguous name
  --> $DIR/methods.rs:36:12
   |
36 |     fn new(self) {}
   |            ^^^^

error: methods called `new` usually return `Self`
  --> $DIR/methods.rs:36:5
   |
36 |     fn new(self) {}
   |     ^^^^^^^^^^^^^^^
   |
   = note: `-D new-ret-no-self` implied by `-D warnings`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:80:24
   |
80 |     fn new() -> Option<V<T>> { None }
   |                        ^^^^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:84:19
   |
84 |     type Output = T;
   |                   ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:85:25
   |
85 |     fn mul(self, other: T) -> T { self } // no error, obviously
   |                         ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:85:31
   |
85 |     fn mul(self, other: T) -> T { self } // no error, obviously
   |                               ^ help: use the applicable keyword: `Self`

error: called `map(f).unwrap_or(a)` on an Option value. This can be done more directly by calling `map_or(a, f)` instead
   --> $DIR/methods.rs:104:13
    |
104 |       let _ = opt.map(|x| x + 1)
    |  _____________^
105 | |
106 | |                .unwrap_or(0); // should lint even though this call is on a separate line
    | |____________________________^
    |
    = note: `-D option-map-unwrap-or` implied by `-D warnings`
    = note: replace `map(|x| x + 1).unwrap_or(0)` with `map_or(0, |x| x + 1)`

error: called `map(f).unwrap_or(a)` on an Option value. This can be done more directly by calling `map_or(a, f)` instead
   --> $DIR/methods.rs:108:13
    |
108 |       let _ = opt.map(|x| {
    |  _____________^
109 | |                         x + 1
110 | |                     }
111 | |               ).unwrap_or(0);
    | |____________________________^

error: called `map(f).unwrap_or(a)` on an Option value. This can be done more directly by calling `map_or(a, f)` instead
   --> $DIR/methods.rs:112:13
    |
112 |       let _ = opt.map(|x| x + 1)
    |  _____________^
113 | |                .unwrap_or({
114 | |                     0
115 | |                 });
    | |__________________^

error: called `map(f).unwrap_or(None)` on an Option value. This can be done more directly by calling `and_then(f)` instead
   --> $DIR/methods.rs:117:13
    |
117 |     let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: replace `map(|x| Some(x + 1)).unwrap_or(None)` with `and_then(|x| Some(x + 1))`

error: called `map(f).unwrap_or(None)` on an Option value. This can be done more directly by calling `and_then(f)` instead
   --> $DIR/methods.rs:119:13
    |
119 |       let _ = opt.map(|x| {
    |  _____________^
120 | |         Some(x + 1)
121 | |     }
122 | |     ).unwrap_or(None);
    | |_____________________^

error: called `map(f).unwrap_or(None)` on an Option value. This can be done more directly by calling `and_then(f)` instead
   --> $DIR/methods.rs:123:13
    |
123 |       let _ = opt
    |  _____________^
124 | |         .map(|x| Some(x + 1))
125 | |         .unwrap_or(None);
    | |________________________^
    |
    = note: replace `map(|x| Some(x + 1)).unwrap_or(None)` with `and_then(|x| Some(x + 1))`

error: called `map(f).unwrap_or_else(g)` on an Option value. This can be done more directly by calling `map_or_else(g, f)` instead
   --> $DIR/methods.rs:131:13
    |
131 |       let _ = opt.map(|x| x + 1)
    |  _____________^
132 | |
133 | |                .unwrap_or_else(|| 0); // should lint even though this call is on a separate line
    | |____________________________________^
    |
    = note: `-D option-map-unwrap-or-else` implied by `-D warnings`
    = note: replace `map(|x| x + 1).unwrap_or_else(|| 0)` with `map_or_else(|| 0, |x| x + 1)`

error: called `map(f).unwrap_or_else(g)` on an Option value. This can be done more directly by calling `map_or_else(g, f)` instead
   --> $DIR/methods.rs:135:13
    |
135 |       let _ = opt.map(|x| {
    |  _____________^
136 | |                         x + 1
137 | |                     }
138 | |               ).unwrap_or_else(|| 0);
    | |____________________________________^

error: called `map(f).unwrap_or_else(g)` on an Option value. This can be done more directly by calling `map_or_else(g, f)` instead
   --> $DIR/methods.rs:139:13
    |
139 |       let _ = opt.map(|x| x + 1)
    |  _____________^
140 | |                .unwrap_or_else(||
141 | |                     0
142 | |                 );
    | |_________________^

error: called `map_or(None, f)` on an Option value. This can be done more directly by calling `and_then(f)` instead
   --> $DIR/methods.rs:148:13
    |
148 |     let _ = opt.map_or(None, |x| Some(x + 1));
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using and_then instead: `opt.and_then(|x| Some(x + 1))`
    |
    = note: `-D option-map-or-none` implied by `-D warnings`

error: called `map_or(None, f)` on an Option value. This can be done more directly by calling `and_then(f)` instead
   --> $DIR/methods.rs:150:13
    |
150 |       let _ = opt.map_or(None, |x| {
    |  _____________^
151 | |                         Some(x + 1)
152 | |                        }
153 | |                 );
    | |_________________^
help: try using and_then instead
    |
150 |     let _ = opt.and_then(|x| {
151 |                         Some(x + 1)
152 |                        });
    |

error: called `map(f).unwrap_or_else(g)` on a Result value. This can be done more directly by calling `ok().map_or_else(g, f)` instead
   --> $DIR/methods.rs:163:13
    |
163 |       let _ = res.map(|x| x + 1)
    |  _____________^
164 | |
165 | |                .unwrap_or_else(|e| 0); // should lint even though this call is on a separate line
    | |_____________________________________^
    |
    = note: `-D result-map-unwrap-or-else` implied by `-D warnings`
    = note: replace `map(|x| x + 1).unwrap_or_else(|e| 0)` with `ok().map_or_else(|e| 0, |x| x + 1)`

error: called `map(f).unwrap_or_else(g)` on a Result value. This can be done more directly by calling `ok().map_or_else(g, f)` instead
   --> $DIR/methods.rs:167:13
    |
167 |       let _ = res.map(|x| {
    |  _____________^
168 | |                         x + 1
169 | |                     }
170 | |               ).unwrap_or_else(|e| 0);
    | |_____________________________________^

error: called `map(f).unwrap_or_else(g)` on a Result value. This can be done more directly by calling `ok().map_or_else(g, f)` instead
   --> $DIR/methods.rs:171:13
    |
171 |       let _ = res.map(|x| x + 1)
    |  _____________^
172 | |                .unwrap_or_else(|e|
173 | |                     0
174 | |                 );
    | |_________________^

error: unnecessary structure name repetition
   --> $DIR/methods.rs:200:24
    |
200 |     fn filter(self) -> IteratorFalsePositives {
    |                        ^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
   --> $DIR/methods.rs:204:22
    |
204 |     fn next(self) -> IteratorFalsePositives {
    |                      ^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
   --> $DIR/methods.rs:224:32
    |
224 |     fn skip(self, _: usize) -> IteratorFalsePositives {
    |                                ^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`

error: called `filter(p).next()` on an `Iterator`. This is more succinctly expressed by calling `.find(p)` instead.
   --> $DIR/methods.rs:234:13
    |
234 |     let _ = v.iter().filter(|&x| *x < 0).next();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D filter-next` implied by `-D warnings`
    = note: replace `filter(|&x| *x < 0).next()` with `find(|&x| *x < 0)`

error: called `filter(p).next()` on an `Iterator`. This is more succinctly expressed by calling `.find(p)` instead.
   --> $DIR/methods.rs:237:13
    |
237 |       let _ = v.iter().filter(|&x| {
    |  _____________^
238 | |                                 *x < 0
239 | |                             }
240 | |                    ).next();
    | |___________________________^

error: called `is_some()` after searching an `Iterator` with find. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:252:13
    |
252 |     let _ = v.iter().find(|&x| *x < 0).is_some();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D search-is-some` implied by `-D warnings`
    = note: replace `find(|&x| *x < 0).is_some()` with `any(|&x| *x < 0)`

error: called `is_some()` after searching an `Iterator` with find. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:255:13
    |
255 |       let _ = v.iter().find(|&x| {
    |  _____________^
256 | |                               *x < 0
257 | |                           }
258 | |                    ).is_some();
    | |______________________________^

error: called `is_some()` after searching an `Iterator` with position. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:261:13
    |
261 |     let _ = v.iter().position(|&x| x < 0).is_some();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: replace `position(|&x| x < 0).is_some()` with `any(|&x| x < 0)`

error: called `is_some()` after searching an `Iterator` with position. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:264:13
    |
264 |       let _ = v.iter().position(|&x| {
    |  _____________^
265 | |                                   x < 0
266 | |                               }
267 | |                    ).is_some();
    | |______________________________^

error: called `is_some()` after searching an `Iterator` with rposition. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:270:13
    |
270 |     let _ = v.iter().rposition(|&x| x < 0).is_some();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: replace `rposition(|&x| x < 0).is_some()` with `any(|&x| x < 0)`

error: called `is_some()` after searching an `Iterator` with rposition. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:273:13
    |
273 |       let _ = v.iter().rposition(|&x| {
    |  _____________^
274 | |                                    x < 0
275 | |                                }
276 | |                    ).is_some();
    | |______________________________^

error: unnecessary structure name repetition
   --> $DIR/methods.rs:290:21
    |
290 |         fn new() -> Foo { Foo }
    |                     ^^^ help: use the applicable keyword: `Self`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:308:22
    |
308 |     with_constructor.unwrap_or(make());
    |                      ^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(make)`
    |
    = note: `-D or-fun-call` implied by `-D warnings`

error: use of `unwrap_or` followed by a call to `new`
   --> $DIR/methods.rs:311:5
    |
311 |     with_new.unwrap_or(Vec::new());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_new.unwrap_or_default()`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:314:21
    |
314 |     with_const_args.unwrap_or(Vec::with_capacity(12));
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| Vec::with_capacity(12))`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:317:14
    |
317 |     with_err.unwrap_or(make());
    |              ^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| make())`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:320:19
    |
320 |     with_err_args.unwrap_or(Vec::with_capacity(12));
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| Vec::with_capacity(12))`

error: use of `unwrap_or` followed by a call to `default`
   --> $DIR/methods.rs:323:5
    |
323 |     with_default_trait.unwrap_or(Default::default());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_trait.unwrap_or_default()`

error: use of `unwrap_or` followed by a call to `default`
   --> $DIR/methods.rs:326:5
    |
326 |     with_default_type.unwrap_or(u64::default());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_default_type.unwrap_or_default()`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:329:14
    |
329 |     with_vec.unwrap_or(vec![]);
    |              ^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ))`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:334:21
    |
334 |     without_default.unwrap_or(Foo::new());
    |                     ^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(Foo::new)`

error: use of `or_insert` followed by a function call
   --> $DIR/methods.rs:337:19
    |
337 |     map.entry(42).or_insert(String::new());
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `or_insert_with(String::new)`

error: use of `or_insert` followed by a function call
   --> $DIR/methods.rs:340:21
    |
340 |     btree.entry(42).or_insert(String::new());
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `or_insert_with(String::new)`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:343:21
    |
343 |     let _ = stringy.unwrap_or("".to_owned());
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| "".to_owned())`

error: use of `expect` followed by a function call
   --> $DIR/methods.rs:366:26
    |
366 |     with_none_and_format.expect(&format!("Error {}: fake error", error_code));
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!("Error {}: fake error", error_code))`
    |
    = note: `-D expect-fun-call` implied by `-D warnings`

error: use of `expect` followed by a function call
   --> $DIR/methods.rs:369:26
    |
369 |     with_none_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!(format!("Error {}: fake error", error_code).as_str()))`

error: use of `expect` followed by a function call
   --> $DIR/methods.rs:379:25
    |
379 |     with_err_and_format.expect(&format!("Error {}: fake error", error_code));
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!("Error {}: fake error", error_code))`

error: use of `expect` followed by a function call
   --> $DIR/methods.rs:382:25
    |
382 |     with_err_and_as_str.expect(format!("Error {}: fake error", error_code).as_str());
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|_| panic!(format!("Error {}: fake error", error_code).as_str()))`

error: called `.iter().nth()` on a Vec. Calling `.get()` is both faster and more readable
   --> $DIR/methods.rs:402:23
    |
402 |         let bad_vec = some_vec.iter().nth(3);
    |                       ^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D iter-nth` implied by `-D warnings`

error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
   --> $DIR/methods.rs:403:26
    |
403 |         let bad_slice = &some_vec[..].iter().nth(3);
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
   --> $DIR/methods.rs:404:31
    |
404 |         let bad_boxed_slice = boxed_slice.iter().nth(3);
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter().nth()` on a VecDeque. Calling `.get()` is both faster and more readable
   --> $DIR/methods.rs:405:29
    |
405 |         let bad_vec_deque = some_vec_deque.iter().nth(3);
    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter_mut().nth()` on a Vec. Calling `.get_mut()` is both faster and more readable
   --> $DIR/methods.rs:410:23
    |
410 |         let bad_vec = some_vec.iter_mut().nth(3);
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter_mut().nth()` on a slice. Calling `.get_mut()` is both faster and more readable
   --> $DIR/methods.rs:413:26
    |
413 |         let bad_slice = &some_vec[..].iter_mut().nth(3);
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter_mut().nth()` on a VecDeque. Calling `.get_mut()` is both faster and more readable
   --> $DIR/methods.rs:416:29
    |
416 |         let bad_vec_deque = some_vec_deque.iter_mut().nth(3);
    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
   --> $DIR/methods.rs:428:13
    |
428 |     let _ = some_vec.iter().skip(42).next();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D iter-skip-next` implied by `-D warnings`

error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
   --> $DIR/methods.rs:429:13
    |
429 |     let _ = some_vec.iter().cycle().skip(42).next();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
   --> $DIR/methods.rs:430:13
    |
430 |     let _ = (1..10).skip(10).next();
    |             ^^^^^^^^^^^^^^^^^^^^^^^

error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
   --> $DIR/methods.rs:431:14
    |
431 |     let _ = &some_vec[..].iter().skip(3).next();
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: used unwrap() on an Option value. If you don't want to handle the None case gracefully, consider using expect() to provide a better panic message
   --> $DIR/methods.rs:440:13
    |
440 |     let _ = opt.unwrap();
    |             ^^^^^^^^^^^^
    |
    = note: `-D option-unwrap-used` implied by `-D warnings`

error: aborting due to 70 previous errors