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) { } | ^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D should-implement-trait` implied by `-D warnings` 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 } | ^^^^ | = note: `-D wrong-self-convention` implied by `-D warnings` error: methods called `new` usually take no self; consider choosing a less ambiguous name --> methods.rs:30:12 | 30 | fn new(self) {} | ^^^^ | = note: `-D wrong-self-convention` implied by `-D warnings` 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); | |____________________________^ | = note: `-D option-map-unwrap-or` 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:105:13 | 105 | let _ = opt.map(|x| x + 1) | _____________^ 106 | | .unwrap_or({ 107 | | 0 108 | | }); | |__________________^ | = note: `-D option-map-unwrap-or` implied by `-D warnings` 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); | |____________________________________^ | = note: `-D option-map-unwrap-or-else` implied by `-D warnings` 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 | | ); | |_________________^ | = note: `-D option-map-unwrap-or-else` implied by `-D warnings` 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(); | |___________________________^ | = note: `-D filter-next` implied by `-D warnings` 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(); | |______________________________^ | = note: `-D search-is-some` implied by `-D warnings` 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: `-D search-is-some` implied by `-D warnings` = 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(); | |______________________________^ | = note: `-D search-is-some` implied by `-D warnings` 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: `-D search-is-some` implied by `-D warnings` = 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(); | |______________________________^ | = note: `-D search-is-some` implied by `-D warnings` 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()` | = note: `-D or-fun-call` implied by `-D warnings` 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))` | = note: `-D or-fun-call` implied by `-D warnings` 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())` | = note: `-D or-fun-call` implied by `-D warnings` 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))` | = note: `-D or-fun-call` implied by `-D warnings` 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()` | = note: `-D or-fun-call` implied by `-D warnings` 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()` | = note: `-D or-fun-call` implied by `-D warnings` 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 ) , * ] ))` | = note: `-D or-fun-call` implied by `-D warnings` 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)` | = note: `-D or-fun-call` implied by `-D warnings` 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)` | = note: `-D or-fun-call` implied by `-D warnings` 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)` | = note: `-D or-fun-call` implied by `-D warnings` 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())` | = note: `-D or-fun-call` implied by `-D warnings` 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); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ | = 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:316:31 | 316 | let bad_boxed_slice = boxed_slice.iter().nth(3); | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-nth` implied by `-D warnings` 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); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-nth` implied by `-D warnings` 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); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-nth` implied by `-D warnings` 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); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-nth` implied by `-D warnings` 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); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-nth` implied by `-D warnings` 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(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = 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:342:13 | 342 | let _ = (1..10).skip(10).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:343:14 | 343 | let _ = &some_vec[..].iter().skip(3).next(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-skip-next` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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]` | = note: `-D get-unwrap` implied by `-D warnings` 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"); | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = 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:409:5 | 409 | res4.ok().expect("argh"); | ^^^^^^^^^^^^^^^^^^^^^^^^ | = 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:411:5 | 411 | res5.ok().expect("oops"); | ^^^^^^^^^^^^^^^^^^^^^^^^ | = 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:413:5 | 413 | res6.ok().expect("meh"); | ^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D ok-expect` implied by `-D warnings` 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(' ')` | = note: `-D chars-next-cmp` implied by `-D warnings` 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")` | = note: `-D string-extend-chars` implied by `-D warnings` error: calling `.extend(_.chars())` --> methods.rs:441:5 | 441 | s.extend(def.chars()); | ^^^^^^^^^^^^^^^^^^^^^ help: try this `s.push_str(&def)` | = note: `-D string-extend-chars` implied by `-D warnings` 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)` | = note: `-D clone-on-copy` implied by `-D warnings` error: using `clone` on a `Copy` type --> methods.rs:460:5 | 460 | t.clone(); | ^^^^^^^^^ help: try removing the `clone` call `t` | = note: `-D clone-on-copy` implied by `-D warnings` error: using `clone` on a `Copy` type --> methods.rs:462:5 | 462 | Some(t).clone(); | ^^^^^^^^^^^^^^^ help: try removing the `clone` call `Some(t)` | = note: `-D clone-on-copy` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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')` | = note: `-D single-char-pattern` implied by `-D warnings` 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 = v.iter().cloned().collect(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: `-D iter-cloned-collect` implied by `-D warnings` error: aborting due to previous error(s) To learn more, run the command again with --verbose.