1 #![warn(clippy::while_let_on_iterator)]
2 #![allow(clippy::never_loop, clippy::cognitive_complexity)]
6 while let Option::Some(x) = iter.next() {
11 while let Some(x) = iter.next() {
16 while let Some(_) = iter.next() {}
19 while let None = iter.next() {} // this is fine (if nonsensical)
22 if let Some(x) = iter.next() {
27 // the following shouldn't warn because it can't be written with a for loop
28 let mut iter = 1u32..20;
29 while let Some(x) = iter.next() {
30 println!("next: {:?}", iter.next())
34 let mut iter = 1u32..20;
35 while let Some(x) = iter.next() {
36 println!("next: {:?}", iter.next());
40 let mut iter = 1u32..20;
41 while let Some(x) = iter.next() {
44 println!("Remaining iter {:?}", iter);
47 let mut iter = 1u32..20;
48 while let Some(x) = iter.next() {
58 // consume all the 42s
59 while let Some(&42) = b.next() {}
64 while let Some(&(1, 2, 3)) = b.next() {}
69 while let Some(&None) = b.next() {}
71 /* This gives “refutable pattern in `for` loop binding: `&_` not covered”
73 for &(1, 2, 3) in b {}
74 for &Option::None in b.next() {}
82 // x is reused, so don't lint here
83 while let Some(v) = y.next() {}
88 while let Some(v) = y.next() {
89 // y is reused, don't lint
95 while let Some(v) = y.next() {
96 // use a for loop here
102 use std::collections::HashSet;
103 let mut values = HashSet::new();
106 while let Some(&value) = values.iter().next() {
107 values.remove(&value);
112 // This should not cause an ICE and suggest:
114 // for _ in values.iter() {}
116 use std::collections::HashSet;
117 let mut values = HashSet::new();
120 while let Some(..) = values.iter().next() {
126 let array = [Some(0), None, Some(1)];
127 let mut iter = array.iter();
129 while let Some(elem) = iter.next() {
130 let _ = elem.or_else(|| *iter.next()?);