rust-clippy/tests/ui/methods.stderr

error: unnecessary structure name repetition
  --> $DIR/methods.rs:20:25
   |
20 |     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:20:31
   |
20 |     fn add(self, other: T) -> T { self }
   |                               ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:23:26
   |
23 |     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:23:33
   |
23 |     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:24:21
   |
24 |     fn div(self) -> T { self } // no error, different #arguments
   |                     ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:25:25
   |
25 |     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:20:5
   |
20 |     fn add(self, other: T) -> T { self }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D should-implement-trait` implied by `-D warnings`

error: defining a method called `drop` on this type; consider implementing the `std::ops::Drop` trait or choosing a less ambiguous name
  --> $DIR/methods.rs:21:5
   |
21 |     fn drop(&mut self) { }
   |     ^^^^^^^^^^^^^^^^^^^^^^

error: methods called `into_*` usually take self by value; consider choosing a less ambiguous name
  --> $DIR/methods.rs:28:17
   |
28 |     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:30:21
   |
30 |     fn to_something(self) -> u32 { 0 }
   |                     ^^^^

error: methods called `new` usually take no self; consider choosing a less ambiguous name
  --> $DIR/methods.rs:32:12
   |
32 |     fn new(self) {}
   |            ^^^^

error: methods called `new` usually return `Self`
  --> $DIR/methods.rs:32:5
   |
32 |     fn new(self) {}
   |     ^^^^^^^^^^^^^^^
   |
   = note: `-D new-ret-no-self` implied by `-D warnings`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:76:24
   |
76 |     fn new() -> Option<V<T>> { None }
   |                        ^^^^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:80:19
   |
80 |     type Output = T;
   |                   ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:81:25
   |
81 |     fn mul(self, other: T) -> T { self } // no error, obviously
   |                         ^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
  --> $DIR/methods.rs:81:31
   |
81 |     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:100:13
    |
100 |       let _ = opt.map(|x| x + 1)
    |  _____________^
101 | |
102 | |                .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:104:13
    |
104 |       let _ = opt.map(|x| {
    |  _____________^
105 | |                         x + 1
106 | |                     }
107 | |               ).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:108:13
    |
108 |       let _ = opt.map(|x| x + 1)
    |  _____________^
109 | |                .unwrap_or({
110 | |                     0
111 | |                 });
    | |__________________^

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:113:13
    |
113 |     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:115:13
    |
115 |       let _ = opt.map(|x| {
    |  _____________^
116 | |         Some(x + 1)
117 | |     }
118 | |     ).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:119:13
    |
119 |       let _ = opt
    |  _____________^
120 | |         .map(|x| Some(x + 1))
121 | |         .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:127:13
    |
127 |       let _ = opt.map(|x| x + 1)
    |  _____________^
128 | |
129 | |                .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:131:13
    |
131 |       let _ = opt.map(|x| {
    |  _____________^
132 | |                         x + 1
133 | |                     }
134 | |               ).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:135:13
    |
135 |       let _ = opt.map(|x| x + 1)
    |  _____________^
136 | |                .unwrap_or_else(||
137 | |                     0
138 | |                 );
    | |_________________^

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:144:13
    |
144 |     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:146:13
    |
146 |       let _ = opt.map_or(None, |x| {
    |  _____________^
147 | |                         Some(x + 1)
148 | |                        }
149 | |                 );
    | |_________________^
    |
help: try using and_then instead
    |
146 |     let _ = opt.and_then(|x| {
147 |                         Some(x + 1)
148 |                        });
    |

error: unnecessary structure name repetition
   --> $DIR/methods.rs:196:24
    |
196 |     fn filter(self) -> IteratorFalsePositives {
    |                        ^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
   --> $DIR/methods.rs:200:22
    |
200 |     fn next(self) -> IteratorFalsePositives {
    |                      ^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`

error: unnecessary structure name repetition
   --> $DIR/methods.rs:220:32
    |
220 |     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:230:13
    |
230 |     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:233:13
    |
233 |       let _ = v.iter().filter(|&x| {
    |  _____________^
234 | |                                 *x < 0
235 | |                             }
236 | |                    ).next();
    | |___________________________^

error: called `is_some()` after searching an `Iterator` with find. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:248:13
    |
248 |     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:251:13
    |
251 |       let _ = v.iter().find(|&x| {
    |  _____________^
252 | |                               *x < 0
253 | |                           }
254 | |                    ).is_some();
    | |______________________________^

error: called `is_some()` after searching an `Iterator` with position. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:257:13
    |
257 |     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:260:13
    |
260 |       let _ = v.iter().position(|&x| {
    |  _____________^
261 | |                                   x < 0
262 | |                               }
263 | |                    ).is_some();
    | |______________________________^

error: called `is_some()` after searching an `Iterator` with rposition. This is more succinctly expressed by calling `any()`.
   --> $DIR/methods.rs:266:13
    |
266 |     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:269:13
    |
269 |       let _ = v.iter().rposition(|&x| {
    |  _____________^
270 | |                                    x < 0
271 | |                                }
272 | |                    ).is_some();
    | |______________________________^

error: unnecessary structure name repetition
   --> $DIR/methods.rs:286:21
    |
286 |         fn new() -> Foo { Foo }
    |                     ^^^ help: use the applicable keyword: `Self`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:304:5
    |
304 |     with_constructor.unwrap_or(make());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_constructor.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:307:5
    |
307 |     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:310:5
    |
310 |     with_const_args.unwrap_or(Vec::with_capacity(12));
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_const_args.unwrap_or_else(|| Vec::with_capacity(12))`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:313:5
    |
313 |     with_err.unwrap_or(make());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err.unwrap_or_else(|_| make())`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:316:5
    |
316 |     with_err_args.unwrap_or(Vec::with_capacity(12));
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err_args.unwrap_or_else(|_| Vec::with_capacity(12))`

error: use of `unwrap_or` followed by a call to `default`
   --> $DIR/methods.rs:319:5
    |
319 |     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:322:5
    |
322 |     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:325:5
    |
325 |     with_vec.unwrap_or(vec![]);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_vec.unwrap_or_else(|| < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ))`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:330:5
    |
330 |     without_default.unwrap_or(Foo::new());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `without_default.unwrap_or_else(Foo::new)`

error: use of `or_insert` followed by a function call
   --> $DIR/methods.rs:333:5
    |
333 |     map.entry(42).or_insert(String::new());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `map.entry(42).or_insert_with(String::new)`

error: use of `or_insert` followed by a function call
   --> $DIR/methods.rs:336:5
    |
336 |     btree.entry(42).or_insert(String::new());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `btree.entry(42).or_insert_with(String::new)`

error: use of `unwrap_or` followed by a function call
   --> $DIR/methods.rs:339:13
    |
339 |     let _ = stringy.unwrap_or("".to_owned());
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `stringy.unwrap_or_else(|| "".to_owned())`

error: called `.iter().nth()` on a Vec. Calling `.get()` is both faster and more readable
   --> $DIR/methods.rs:350:23
    |
350 |         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:351:26
    |
351 |         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:352:31
    |
352 |         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:353:29
    |
353 |         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:358:23
    |
358 |         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:361:26
    |
361 |         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:364:29
    |
364 |         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:376:13
    |
376 |     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:377:13
    |
377 |     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:378:13
    |
378 |     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:379:14
    |
379 |     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:388:13
    |
388 |     let _ = opt.unwrap();
    |             ^^^^^^^^^^^^
    |
    = note: `-D option-unwrap-used` implied by `-D warnings`