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2b03887a FG |
1 | // check-pass |
2 | ||
3 | fn main() { | |
4 | // Common | |
5 | for _ in Some(1) {} | |
6 | //~^ WARN for loop over an `Option`. This is more readably written as an `if let` statement | |
7 | //~| HELP to check pattern in a loop use `while let` | |
8 | //~| HELP consider using `if let` to clear intent | |
9 | for _ in Ok::<_, ()>(1) {} | |
10 | //~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement | |
11 | //~| HELP to check pattern in a loop use `while let` | |
12 | //~| HELP consider using `if let` to clear intent | |
13 | ||
14 | // `Iterator::next` specific | |
15 | for _ in [0; 0].iter().next() {} | |
16 | //~^ WARN for loop over an `Option`. This is more readably written as an `if let` statement | |
17 | //~| HELP to iterate over `[0; 0].iter()` remove the call to `next` | |
18 | //~| HELP consider using `if let` to clear intent | |
19 | ||
20 | // `Result<impl Iterator, _>`, but function doesn't return `Result` | |
21 | for _ in Ok::<_, ()>([0; 0].iter()) {} | |
22 | //~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement | |
23 | //~| HELP to check pattern in a loop use `while let` | |
24 | //~| HELP consider using `if let` to clear intent | |
25 | } | |
26 | ||
27 | fn _returns_result() -> Result<(), ()> { | |
28 | // `Result<impl Iterator, _>` | |
29 | for _ in Ok::<_, ()>([0; 0].iter()) {} | |
30 | //~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement | |
31 | //~| HELP to check pattern in a loop use `while let` | |
32 | //~| HELP consider unwrapping the `Result` with `?` to iterate over its contents | |
33 | //~| HELP consider using `if let` to clear intent | |
34 | ||
35 | // `Result<impl IntoIterator>` | |
36 | for _ in Ok::<_, ()>([0; 0]) {} | |
37 | //~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement | |
38 | //~| HELP to check pattern in a loop use `while let` | |
39 | //~| HELP consider unwrapping the `Result` with `?` to iterate over its contents | |
40 | //~| HELP consider using `if let` to clear intent | |
41 | ||
42 | Ok(()) | |
43 | } |