rust/tests/ui/reversed_empty_ranges_fixable.rs

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// run-rustfix
#![warn(clippy::reversed_empty_ranges)]
const ANSWER: i32 = 42;
fn main() {
// These should be linted:
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(42..=21).for_each(|x| println!("{}", x));
let _ = (ANSWER..21).filter(|x| x % 2 == 0).take(10).collect::<Vec<_>>();
for _ in -21..=-42 {}
for _ in 42u32..21u32 {}
// These should be ignored as they are not empty ranges:
(21..=42).for_each(|x| println!("{}", x));
(21..42).for_each(|x| println!("{}", x));
let arr = [1, 2, 3, 4, 5];
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let _ = &arr[1..=3];
let _ = &arr[1..3];
for _ in 21..=42 {}
for _ in 21..42 {}
// This range is empty but should be ignored, see issue #5689
let _ = &arr[0..0];
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}