1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
//@ check-pass
fn main() {
// Common
for _ in Some(1) {}
//~^ WARN for loop over an `Option`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
for _ in Ok::<_, ()>(1) {}
//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
// `Iterator::next` specific
for _ in [0; 0].iter().next() {}
//~^ WARN for loop over an `Option`. This is more readably written as an `if let` statement
//~| HELP to iterate over `[0; 0].iter()` remove the call to `next`
//~| HELP consider using `if let` to clear intent
// `Result<impl Iterator, _>`, but function doesn't return `Result`
for _ in Ok::<_, ()>([0; 0].iter()) {}
//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
}
fn _returns_result() -> Result<(), ()> {
// `Result<impl Iterator, _>`
for _ in Ok::<_, ()>([0; 0].iter()) {}
//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider unwrapping the `Result` with `?` to iterate over its contents
//~| HELP consider using `if let` to clear intent
// `Result<impl IntoIterator>`
for _ in Ok::<_, ()>([0; 0]) {}
//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider unwrapping the `Result` with `?` to iterate over its contents
//~| HELP consider using `if let` to clear intent
Ok(())
}
fn _by_ref() {
// Shared refs
for _ in &Some(1) {}
//~^ WARN for loop over a `&Option`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
for _ in &Ok::<_, ()>(1) {}
//~^ WARN for loop over a `&Result`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
// Mutable refs
for _ in &mut Some(1) {}
//~^ WARN for loop over a `&mut Option`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
for _ in &mut Ok::<_, ()>(1) {}
//~^ WARN for loop over a `&mut Result`. This is more readably written as an `if let` statement
//~| HELP to check pattern in a loop use `while let`
//~| HELP consider using `if let` to clear intent
}
|
