rust-clippy/clippy_tests/examples/methods.stderr

error: defining a method called `add` on this type; consider implementing the `std::ops::Add` trait or choosing a less ambiguous name
  --> methods.rs:18:5
   |
18 |     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
  --> methods.rs:19:5
   |
19 |     fn drop(&mut self) { }
   |     ^^^^^^^^^^^^^^^^^^^^^^

error: methods called `into_*` usually take self by value; consider choosing a less ambiguous name
  --> methods.rs:26:17
   |
26 |     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
  --> methods.rs:28:21
   |
28 |     fn to_something(self) -> u32 { 0 }
   |                     ^^^^

error: methods called `new` usually take no self; consider choosing a less ambiguous name
  --> methods.rs:30:12
   |
30 |     fn new(self) {}
   |            ^^^^

error: methods called `new` usually return `Self`
  --> methods.rs:30:5
   |
30 |     fn new(self) {}
   |     ^^^^^^^^^^^^^^^
   |
   = note: `-D new-ret-no-self` implied by `-D warnings`

error: called `map(f).unwrap_or(a)` on an Option value. This can be done more directly by calling `map_or(a, f)` instead
  --> methods.rs:97:13
   |
97 |       let _ = opt.map(|x| x + 1)
   |  _____________^
98 | |
99 | |                .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
   --> methods.rs:101:13
    |
101 |       let _ = opt.map(|x| {
    |  _____________^
102 | |                         x + 1
103 | |                     }
104 | |               ).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
   --> methods.rs:105:13
    |
105 |       let _ = opt.map(|x| x + 1)
    |  _____________^
106 | |                .unwrap_or({
107 | |                     0
108 | |                 });
    | |__________________^

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
   --> methods.rs:114:13
    |
114 |       let _ = opt.map(|x| x + 1)
    |  _____________^
115 | |
116 | |                .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
   --> methods.rs:118:13
    |
118 |       let _ = opt.map(|x| {
    |  _____________^
119 | |                         x + 1
120 | |                     }
121 | |               ).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
   --> methods.rs:122:13
    |
122 |       let _ = opt.map(|x| x + 1)
    |  _____________^
123 | |                .unwrap_or_else(||
124 | |                     0
125 | |                 );
    | |_________________^

error: called `filter(p).next()` on an `Iterator`. This is more succinctly expressed by calling `.find(p)` instead.
   --> methods.rs:194:13
    |
194 |     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.
   --> methods.rs:197:13
    |
197 |       let _ = v.iter().filter(|&x| {
    |  _____________^
198 | |                                 *x < 0
199 | |                             }
200 | |                    ).next();
    | |___________________________^

error: called `is_some()` after searching an `Iterator` with find. This is more succinctly expressed by calling `any()`.
   --> methods.rs:212:13
    |
212 |     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()`.
   --> methods.rs:215:13
    |
215 |       let _ = v.iter().find(|&x| {
    |  _____________^
216 | |                               *x < 0
217 | |                           }
218 | |                    ).is_some();
    | |______________________________^

error: called `is_some()` after searching an `Iterator` with position. This is more succinctly expressed by calling `any()`.
   --> methods.rs:221:13
    |
221 |     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()`.
   --> methods.rs:224:13
    |
224 |       let _ = v.iter().position(|&x| {
    |  _____________^
225 | |                                   x < 0
226 | |                               }
227 | |                    ).is_some();
    | |______________________________^

error: called `is_some()` after searching an `Iterator` with rposition. This is more succinctly expressed by calling `any()`.
   --> methods.rs:230:13
    |
230 |     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()`.
   --> methods.rs:233:13
    |
233 |       let _ = v.iter().rposition(|&x| {
    |  _____________^
234 | |                                    x < 0
235 | |                                }
236 | |                    ).is_some();
    | |______________________________^

error: use of `unwrap_or` followed by a function call
   --> methods.rs:268:5
    |
268 |     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`
   --> methods.rs:271:5
    |
271 |     with_new.unwrap_or(Vec::new());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_new.unwrap_or_default()`

error: use of `unwrap_or` followed by a function call
   --> methods.rs:274:5
    |
274 |     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
   --> methods.rs:277:5
    |
277 |     with_err.unwrap_or(make());
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `with_err.unwrap_or_else(|_| make())`

error: use of `unwrap_or` followed by a function call
   --> methods.rs:280:5
    |
280 |     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`
   --> methods.rs:283:5
    |
283 |     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`
   --> methods.rs:286:5
    |
286 |     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
   --> methods.rs:289:5
    |
289 |     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
   --> methods.rs:294:5
    |
294 |     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
   --> methods.rs:297:5
    |
297 |     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
   --> methods.rs:300:5
    |
300 |     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
   --> methods.rs:303:13
    |
303 |     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
   --> methods.rs:314:23
    |
314 |         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
   --> methods.rs:315:26
    |
315 |         let bad_slice = &some_vec[..].iter().nth(3);
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter().nth()` on a slice. Calling `.get()` is both faster and more readable
   --> methods.rs:316:31
    |
316 |         let bad_boxed_slice = boxed_slice.iter().nth(3);
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.iter().nth()` on a VecDeque. Calling `.get()` is both faster and more readable
   --> methods.rs:317:29
    |
317 |         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
   --> methods.rs:322:23
    |
322 |         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
   --> methods.rs:325:26
    |
325 |         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
   --> methods.rs:328:29
    |
328 |         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)`
   --> methods.rs:340:13
    |
340 |     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)`
   --> methods.rs:341:13
    |
341 |     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)`
   --> methods.rs:342:13
    |
342 |     let _ = (1..10).skip(10).next();
    |             ^^^^^^^^^^^^^^^^^^^^^^^

error: called `skip(x).next()` on an iterator. This is more succinctly expressed by calling `nth(x)`
   --> methods.rs:343:14
    |
343 |     let _ = &some_vec[..].iter().skip(3).next();
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `.get().unwrap()` on a slice. Using `[]` is more clear and more concise
   --> methods.rs:369:17
    |
369 |         let _ = boxed_slice.get(1).unwrap();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&boxed_slice[1]`
    |
    = note: `-D get-unwrap` implied by `-D warnings`

error: called `.get().unwrap()` on a slice. Using `[]` is more clear and more concise
   --> methods.rs:370:17
    |
370 |         let _ = some_slice.get(0).unwrap();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_slice[0]`

error: called `.get().unwrap()` on a Vec. Using `[]` is more clear and more concise
   --> methods.rs:371:17
    |
371 |         let _ = some_vec.get(0).unwrap();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_vec[0]`

error: called `.get().unwrap()` on a VecDeque. Using `[]` is more clear and more concise
   --> methods.rs:372:17
    |
372 |         let _ = some_vecdeque.get(0).unwrap();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_vecdeque[0]`

error: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
   --> methods.rs:373:17
    |
373 |         let _ = some_hashmap.get(&1).unwrap();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_hashmap[&1]`

error: called `.get().unwrap()` on a BTreeMap. Using `[]` is more clear and more concise
   --> methods.rs:374:17
    |
374 |         let _ = some_btreemap.get(&1).unwrap();
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&some_btreemap[&1]`

error: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
   --> methods.rs:379:10
    |
379 |         *boxed_slice.get_mut(0).unwrap() = 1;
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut boxed_slice[0]`

error: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
   --> methods.rs:380:10
    |
380 |         *some_slice.get_mut(0).unwrap() = 1;
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_slice[0]`

error: called `.get_mut().unwrap()` on a Vec. Using `[]` is more clear and more concise
   --> methods.rs:381:10
    |
381 |         *some_vec.get_mut(0).unwrap() = 1;
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_vec[0]`

error: called `.get_mut().unwrap()` on a VecDeque. Using `[]` is more clear and more concise
   --> methods.rs:382:10
    |
382 |         *some_vecdeque.get_mut(0).unwrap() = 1;
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut some_vecdeque[0]`

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
   --> methods.rs:396:13
    |
396 |     let _ = opt.unwrap();
    |             ^^^^^^^^^^^^
    |
    = note: `-D option-unwrap-used` implied by `-D warnings`

error: used unwrap() on a Result value. If you don't want to handle the Err case gracefully, consider using expect() to provide a better panic message
   --> methods.rs:399:13
    |
399 |     let _ = res.unwrap();
    |             ^^^^^^^^^^^^
    |
    = note: `-D result-unwrap-used` implied by `-D warnings`

error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
   --> methods.rs:401:5
    |
401 |     res.ok().expect("disaster!");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D ok-expect` implied by `-D warnings`

error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
   --> methods.rs:407:5
    |
407 |     res3.ok().expect("whoof");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
   --> methods.rs:409:5
    |
409 |     res4.ok().expect("argh");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^

error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
   --> methods.rs:411:5
    |
411 |     res5.ok().expect("oops");
    |     ^^^^^^^^^^^^^^^^^^^^^^^^

error: called `ok().expect()` on a Result value. You can call `expect` directly on the `Result`
   --> methods.rs:413:5
    |
413 |     res6.ok().expect("meh");
    |     ^^^^^^^^^^^^^^^^^^^^^^^

error: you should use the `starts_with` method
   --> methods.rs:425:5
    |
425 |     "".chars().next() == Some(' ');
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: like this: `"".starts_with(' ')`
    |
    = note: `-D chars-next-cmp` implied by `-D warnings`

error: you should use the `starts_with` method
   --> methods.rs:426:5
    |
426 |     Some(' ') != "".chars().next();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: like this: `!"".starts_with(' ')`

error: calling `.extend(_.chars())`
   --> methods.rs:435:5
    |
435 |     s.extend(abc.chars());
    |     ^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str(abc)`
    |
    = note: `-D string-extend-chars` implied by `-D warnings`

error: calling `.extend(_.chars())`
   --> methods.rs:438:5
    |
438 |     s.extend("abc".chars());
    |     ^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str("abc")`

error: calling `.extend(_.chars())`
   --> methods.rs:441:5
    |
441 |     s.extend(def.chars());
    |     ^^^^^^^^^^^^^^^^^^^^^ help: try this: `s.push_str(&def)`

error: using `clone` on a `Copy` type
   --> methods.rs:452:5
    |
452 |     42.clone();
    |     ^^^^^^^^^^ help: try removing the `clone` call: `42`
    |
    = note: `-D clone-on-copy` implied by `-D warnings`

error: using `clone` on a `Copy` type
   --> methods.rs:456:5
    |
456 |     (&42).clone();
    |     ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)`

error: using `clone` on a `Copy` type
   --> methods.rs:460:5
    |
460 |     t.clone();
    |     ^^^^^^^^^ help: try removing the `clone` call: `t`

error: using `clone` on a `Copy` type
   --> methods.rs:462:5
    |
462 |     Some(t).clone();
    |     ^^^^^^^^^^^^^^^ help: try removing the `clone` call: `Some(t)`

error: using `clone` on a double-reference; this will copy the reference instead of cloning the inner type
   --> methods.rs:468:22
    |
468 |     let z: &Vec<_> = y.clone();
    |                      ^^^^^^^^^ help: try dereferencing it: `(*y).clone()`
    |
    = note: `-D clone-double-ref` implied by `-D warnings`

error: single-character string constant used as pattern
   --> methods.rs:475:13
    |
475 |     x.split("x");
    |     --------^^^- help: try using a char instead:: `x.split('x')`
    |
    = note: `-D single-char-pattern` implied by `-D warnings`

error: single-character string constant used as pattern
   --> methods.rs:492:16
    |
492 |     x.contains("x");
    |     -----------^^^- help: try using a char instead:: `x.contains('x')`

error: single-character string constant used as pattern
   --> methods.rs:493:19
    |
493 |     x.starts_with("x");
    |     --------------^^^- help: try using a char instead:: `x.starts_with('x')`

error: single-character string constant used as pattern
   --> methods.rs:494:17
    |
494 |     x.ends_with("x");
    |     ------------^^^- help: try using a char instead:: `x.ends_with('x')`

error: single-character string constant used as pattern
   --> methods.rs:495:12
    |
495 |     x.find("x");
    |     -------^^^- help: try using a char instead:: `x.find('x')`

error: single-character string constant used as pattern
   --> methods.rs:496:13
    |
496 |     x.rfind("x");
    |     --------^^^- help: try using a char instead:: `x.rfind('x')`

error: single-character string constant used as pattern
   --> methods.rs:497:14
    |
497 |     x.rsplit("x");
    |     ---------^^^- help: try using a char instead:: `x.rsplit('x')`

error: single-character string constant used as pattern
   --> methods.rs:498:24
    |
498 |     x.split_terminator("x");
    |     -------------------^^^- help: try using a char instead:: `x.split_terminator('x')`

error: single-character string constant used as pattern
   --> methods.rs:499:25
    |
499 |     x.rsplit_terminator("x");
    |     --------------------^^^- help: try using a char instead:: `x.rsplit_terminator('x')`

error: single-character string constant used as pattern
   --> methods.rs:500:17
    |
500 |     x.splitn(0, "x");
    |     ------------^^^- help: try using a char instead:: `x.splitn(0, 'x')`

error: single-character string constant used as pattern
   --> methods.rs:501:18
    |
501 |     x.rsplitn(0, "x");
    |     -------------^^^- help: try using a char instead:: `x.rsplitn(0, 'x')`

error: single-character string constant used as pattern
   --> methods.rs:502:15
    |
502 |     x.matches("x");
    |     ----------^^^- help: try using a char instead:: `x.matches('x')`

error: single-character string constant used as pattern
   --> methods.rs:503:16
    |
503 |     x.rmatches("x");
    |     -----------^^^- help: try using a char instead:: `x.rmatches('x')`

error: single-character string constant used as pattern
   --> methods.rs:504:21
    |
504 |     x.match_indices("x");
    |     ----------------^^^- help: try using a char instead:: `x.match_indices('x')`

error: single-character string constant used as pattern
   --> methods.rs:505:22
    |
505 |     x.rmatch_indices("x");
    |     -----------------^^^- help: try using a char instead:: `x.rmatch_indices('x')`

error: single-character string constant used as pattern
   --> methods.rs:506:25
    |
506 |     x.trim_left_matches("x");
    |     --------------------^^^- help: try using a char instead:: `x.trim_left_matches('x')`

error: single-character string constant used as pattern
   --> methods.rs:507:26
    |
507 |     x.trim_right_matches("x");
    |     ---------------------^^^- help: try using a char instead:: `x.trim_right_matches('x')`

error: you are getting the inner pointer of a temporary `CString`
   --> methods.rs:517:5
    |
517 |     CString::new("foo").unwrap().as_ptr();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D temporary-cstring-as-ptr` implied by `-D warnings`
    = note: that pointer will be invalid outside this expression
help: assign the `CString` to a variable to extend its lifetime
   --> methods.rs:517:5
    |
517 |     CString::new("foo").unwrap().as_ptr();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: called `cloned().collect()` on a slice to create a `Vec`. Calling `to_vec()` is both faster and more readable
   --> methods.rs:522:27
    |
522 |     let v2 : Vec<isize> = v.iter().cloned().collect();
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D iter-cloned-collect` implied by `-D warnings`

error: aborting due to 89 previous errors


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