1 #![warn(clippy::while_let_loop, clippy::empty_loop, clippy::while_let_on_iterator)]
2 #![allow(dead_code, clippy::never_loop, unused, clippy::cognitive_complexity)]
14 // no error, break is not in else clause
47 // no error, else branch does something other than break
56 while let Some(x) = y {
57 // no error, obviously
61 // #675, this used to have a wrong suggestion
63 let (e, l) = match "".split_whitespace().next() {
64 Some(word) => (word.is_empty(), word.len()),
72 while let Option::Some(x) = iter.next() {
77 while let Some(x) = iter.next() {
82 while let Some(_) = iter.next() {}
85 while let None = iter.next() {} // this is fine (if nonsensical)
88 if let Some(x) = iter.next() {
93 // the following shouldn't warn because it can't be written with a for loop
94 let mut iter = 1u32..20;
95 while let Some(x) = iter.next() {
96 println!("next: {:?}", iter.next())
100 let mut iter = 1u32..20;
101 while let Some(x) = iter.next() {
102 println!("next: {:?}", iter.next());
106 let mut iter = 1u32..20;
107 while let Some(x) = iter.next() {
110 println!("Remaining iter {:?}", iter);
113 let mut iter = 1u32..20;
114 while let Some(x) = iter.next() {
119 // regression test (#360)
120 // this should not panic
121 // it's ok if further iterations of the lint
122 // cause this function to trigger it
123 fn no_panic<T>(slice: &[T]) {
124 let mut iter = slice.iter();
126 let _ = match iter.next() {
135 let r: Result<u32, u32> = Ok(42);
152 let mut b = a.iter();
154 // consume all the 42s
155 while let Some(&42) = b.next() {}
158 let mut b = a.iter();
160 while let Some(&(1, 2, 3)) = b.next() {}
163 let mut b = a.iter();
165 while let Some(&None) = b.next() {}
167 /* This gives “refutable pattern in `for` loop binding: `&_` not covered”
169 for &(1, 2, 3) in b {}
170 for &Option::None in b.next() {}
176 let mut y = a.iter();
178 // x is reused, so don't lint here
179 while let Some(v) = y.next() {}
182 let mut y = a.iter();
184 while let Some(v) = y.next() {
185 // y is reused, don't lint
190 let mut y = a.iter();
191 while let Some(v) = y.next() {
192 // use a for loop here
198 // should not trigger clippy::while_let_loop lint because break passes an expression
210 use std::collections::HashSet;
211 let mut values = HashSet::new();
214 while let Some(&value) = values.iter().next() {
215 values.remove(&value);
220 // This should not cause an ICE and suggest:
222 // for _ in values.iter() {}
224 use std::collections::HashSet;
225 let mut values = HashSet::new();
228 while let Some(..) = values.iter().next() {
234 let array = [Some(0), None, Some(1)];
235 let mut iter = array.iter();
237 while let Some(elem) = iter.next() {
238 let _ = elem.or_else(|| *iter.next()?);